Högskolan i Skövde

his.sePublications
Change search
Refine search result
1234567 1 - 50 of 967
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • apa-cv
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Abdul, Nishan
    et al.
    University of Skövde, School of Engineering Science.
    Palmborg, Henrik
    University of Skövde, School of Engineering Science.
    Analys och lösningsförslag för logistik inom Volvo Powertrain2020Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Volvo Powertrain in Skövde is a factory that manufactures truck and bus engines with various volumes. The factory has several departments and functions that together make up the three main parts: foundry, processing, and assembly. One of these departments is logistics, which has the task of organizing internal logistics activities at the company. The logistics department strives to provide good customer service with low costs and environmental impact. The work carried out concerns parts of the current data management system used within the departments warehouse management structure. The current system is not very user-friendly which makes it difficult to get an overview of the storage areas. This, together with other problems, causes the logistics department to experience the system as time-consuming and deficient. The purpose of this work is to produce solution proposals that address the shortcomings of the current system utilizing minimal investments, while facilitating data management and providing better visualization of the warehouses. The methods chosen to achieve the purpose of the work are motivated by a literature study.

    To compare solution proposals, standard IEEE-830 was used as a basis for producing a requirements specification. The requirements specification based on observations and interviews conducted with the logistics department. The solution proposals presented are based on interviews conducted at other sites within the Volvo Group and have been compared with the requirements specification to see how well they fit the needs of the logistics department. The methods used during the execution of the work are also discussed, and finally, recommendations are made for future work.

    Download full text (pdf)
    fulltext
  • 2.
    Abril López, Raimundo
    et al.
    University of Skövde, School of Technology and Society.
    Huertas Molina, Pablo
    University of Skövde, School of Technology and Society.
    González Zuheros, Rocío
    University of Skövde, School of Technology and Society.
    STRUCTURAL ANALYSIS OF A WASHING MACHINE THROUGH ITS LOADING CASES: REDESIGN OF THE TRIPOD AND THE FRONT COVER2011Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This project thesis is developed in collaboration with the mechanical department at University of Skövde, and it is focused in the determination of different loading cases and the application of their results to the optimization of two parts of a washing machine.

     

    The first step in this report is to obtain a numerical model of a washing machine. It includes the assembly in a mechanical software program (Abaqus), and the assignment of the specific boundary conditions and material properties for the problem. Simulation parameters such as mesh size; types of elements, and number of iterations used in the calculations will also be decided.

     

    A study of the different loading cases is carried out with the intention of having a general view of the problem and selecting four specific cases for its application to the reconstruction of the aimed parts (tripod and front cover). This study includes the calculation of the worst relative angle between the tripod and the resultant force for two opposite loads inside the drum. This angle results to be 35º between the arm and the direction of the resultant force.

     

    Through the application of these different loading conditions to this model, the mechanical behaviour of the parts will be obtained and this information will be used in the reconstruction. By mechanical behaviour it is meant to know the maximum level of stress (tension, compression and shear), and deformation (displacement and strain).

     

    Once it is well known which are the most suffering points of the tripod and in the front cover, several different new shapes are created. The parameters considered in this reconstruction were the decrease of volume, the reduction of the level of stress and the deformations. Two of these shapes are chosen and tested in the numerical model, as a checkout.

     

    Finally all these results are presented to the University of Skövde for possible future use.

    Download full text (pdf)
    fulltext
  • 3.
    Adamson, Göran
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Holm, Magnus
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Moore, Philip
    Academy of Innovation & Research, Falmouth University, Cornwall, United kingdom.
    Wang, Lihui
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. KTH Royal Institute of Technology, Stockholm, Sweden.
    A Cloud Service Control Approach for Distributed and Adaptive Equipment Control in Cloud Environments2016In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 41, p. 644-649Article in journal (Refereed)
    Abstract [en]

    A developing trend within the manufacturing shop-floor domain is the move of manufacturing activities into cloud environments, as scalable, on-demand and pay-per-usage cloud services. This will radically change traditional manufacturing, as borderless, distributed and collaborative manufacturing missions between volatile, best suited groups of partners will impose a multitude of advantages. The evolving Cloud Manufacturing (CM) paradigm will enable this new manufacturing concept, and on-going research has described many of its anticipated core virtues and enabling technologies. However, a major key enabling technology within CM which has not yet been fully addressed is the dynamic and distributed planning, control and execution of scattered and cooperating shop-floor equipment, completing joint manufacturing tasks.

    In this paper, the technological perspective for a cloud service-based control approach is described, and how it could be implemented. Existing manufacturing resources, such as soft, hard and capability resources, can be packaged as cloud services, and combined to create different levels of equipment or manufacturing control, ranging from low-level control of single machines or devices (e.g. Robot Control-as-a-Service), up to the execution of high level multi-process manufacturing tasks (e.g. Manufacturing-as-a-Service). A multi-layer control approach, featuring adaptive decision-making for both global and local environmental conditions, is proposed. This is realized through the use of a network of intelligent and distributable decision modules such as event-driven Function Blocks, enabling run-time manufacturing activities to be performed according to actual manufacturing conditions. The control system’s integration to the CM cloud service management functionality is also described.

    Download full text (pdf)
    fulltext
  • 4.
    Adamson, Göran
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Holm, Magnus
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Event-Driven Adaptability using IEC 61499 in Manufacturing Systems2012In: Proceedings of The 5th International Swedish Production Symposium, SPS12 / [ed] Mats Björkman, Linköping: The Swedish Production Academy , 2012, p. 453-460Conference paper (Refereed)
    Abstract [en]

    Different kinds of uncertainty, such as variations in manufacturing capability and functionality, as well as changes in demand, make up a dynamically changing environment for many manufacturing systems of today. The ability to adapt to these unforeseen changes, through dynamic decision-making as well as dynamic control capabilities based on the use of real-time manufacturing information and intelligence, is vital to be able to perform at a competitive level while reducing unscheduled downtime. The event-driven Function Block (FB) model of the IEC 61499 standard, as opposed to the time-triggered and data-driven concept of IEC 61331, supports this approach, making it possible to handle, in a responsive and adaptive way, different kinds of uncertainty. Our objective is to develop methodologies for distributed, adaptive and dynamic process planning as well as machine monitoring and control for machining and assembly operations, using event-driven FBs. The implementation and testing of FB-based control for manufacturing equipment has been successfully realized in prototype systems, with control of both CNC machining and robotic assembly operations. The approach of using IEC 61499 FBs for adaptive control in other applications is also investigated, as an adaptive decision support system for operators at manufacturing facilities is under development. We strongly believe that IEC 61499 will play a major role in the shift to adaptive manufacturing systems.

  • 5.
    Adamson, Göran
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Wang, Lihui
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre. Department of Production Engineering Royal Institute of Technology 100 44 Stockholm, Sweden.
    Holm, Magnus
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    The state of the art of cloud manufacturing and future trends2013In: Proceedings of the ASME 2013 International Manufacturing Science and Engineering Conference MSEC2013 June 10-14, 2013, Madison, Wisconsin, USA, ASME - The American Society of Mechanical Engineers , 2013, Vol. 2, p. Article number-, article id MSEC2013-1123Conference paper (Refereed)
    Abstract [en]

    Cloud manufacturing has emerged as a new manufacturing paradigm, which combines technologies (such as Internet of Things, Cloud computing, semantic Web, virtualisation and service-oriented technologies) with advanced manufacturing models, information and communication technologies. It aims to be networked, intelligent, service-oriented, knowledge-based and energy efficient, and promises a variety of benefits and advantages by providing fast, reliable and secure on-demand services for users. It is envisioned that companies in all sectors of manufacturing will be able to package their resources and know-hows in the Cloud, making them conveniently available for others through pay-as-you-go, which is also timely and economically attractive. Resources, e.g. manufacturing software tools, applications, knowledge and fabrication capabilities, will then be made accessible to presumptive consumers on a worldwide basis. After surveying a vast array of available publications, this paper presents an up-to-date literature review together with future trends and research directions in Cloud manufacturing.

  • 6.
    Adamson, Göran
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Wang, Lihui
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Moore, Philip
    Falmouth University, Cornwall, UK.
    Adaptive Robot Control as a Service in Cloud Manufacturing2015In: ASME 2015 International Manufacturing Science and Engineering Conference: Volume 2: Materials; Biomanufacturing; Properties, Applications and Systems; Sustainable Manufacturing, ASME Press, 2015, Vol. 2, p. Paper No. MSEC2015-9479-Conference paper (Refereed)
    Abstract [en]

    The interest for implementing the concept of Manufacturing-as-a-Service is increasing as concepts for letting the manufacturing shop-floor domain take advantage of the cloud appears. Combining technologies such as Internet of Things, Cloud Computing, Semantic Web, virtualisation and service-oriented technologies with advanced manufacturing models, information and communication technologies, Cloud Manufacturing (CM) is emerging as a new manufacturing paradigm. The ideas of on-demand, scalable and pay-for-usage resource-sharing in this concept will move manufacturing towards distributed and collaborative missions in volatile partnerships. This will require a control approach for distributed planning and execution of cooperating manufacturing activities. Without control based on both global and local environmental conditions, the advantages of CM will not be fulfilled.

    By utilising smart and distributable decision modules such as event-driven FBs, run-time manufacturing operations in a distributed environment may be adjusted to prevailing manufacturing conditions. Packaged in a cloud service for manufacturing equipment control, it will satisfy the control needs in CM. By combining different resource types, such as hard, soft and capability resources, the cloud service Robot Control-as-a-Service can be realised.

    This paper describes the functional perspective and enabling technologies for a control approach for robotic assembly tasks in CM, and describes a scenario for its implementation.

  • 7.
    Adamson, Göran
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Wang, Lihui
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Royal Institute of Technology, Stockholm, Sweden.
    Holm, Magnus
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Moore, Philip
    Falmouth University, Cornwall, United Kingdom.
    Feature-Based Adaptive Manufacturing Equipment Control for Cloud Environments2016In: Proceedings of the ASME 11th International Manufacturing Science and Engineering Conference, 2016, vol 2, American Society of Mechanical Engineers (ASME) , 2016, article id UNSP V002T04A019Conference paper (Refereed)
    Abstract [en]

    The ideas of on-demand, scalable and pay-for-usage resource-sharing in Cloud Manufacturing are steadily attracting more interest. For implementing the concept of Manufacturing as-a-Service in a cloud environment, description models and implementation language for resources and their capabilities are required. A standardized approach for systemived virtualization, servisilisation, retrieval, selection and composition into higher levels of functionality is necessary. For the collaborative sharing and use of networked manufacturing resources there is also a need for a control approach for distributed manufacturing equipment. In this paper, the technological perspective for an adaptive cloud service-based control approach is described, and a supporting information model for its implementation. The control is realized through the use of a network of intelligent and distributable Function Block decision modules, enabling run-time manufacturing activities to be performed according to actual manufacturing conditions. The control system's integration to the cloud service management functionality is described, as well as a feature-level capability model and the use of ontologies and the Semantic Web.

  • 8.
    Adamson, Göran
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Wang, Lihui
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Department of Production Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Moore, Philip
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Feature-based control and information framework for adaptive and distributed manufacturing in cyber physical systems2017In: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 43, p. 305-315Article in journal (Refereed)
    Abstract [en]

    Modern distributed manufacturing within Industry 4.0, supported by Cyber Physical Systems (CPSs), offers many promising capabilities regarding effective and flexible manufacturing, but there remain many challenges which may hinder its exploitation fully. One major issue is how to automatically control manufacturing equipment, e.g. industrial robots and CNC-machines, in an adaptive and effective manner. For collaborative sharing and use of distributed and networked manufacturing resources, a coherent, standardised approach for systemised planning and control at different manufacturing system levels and locations is a paramount prerequisite.

    In this paper, the concept of feature-based manufacturing for adaptive equipment control and resource-task matching in distributed and collaborative CPS manufacturing environments is presented. The concept has a product perspective and builds on the combination of product manufacturing features and event-driven Function Blocks (FB) of the IEC 61499 standard. Distributed control is realised through the use of networked and smart FB decision modules, enabling the performance of collaborative run-time manufacturing activities according to actual manufacturing conditions. A feature-based information framework supporting the matching of manufacturing resources and tasks, as well as the feature-FB control concept, and a demonstration with a cyber-physical robot application, are presented.

  • 9.
    Adawi, Rahim
    University of Skövde, School of Engineering Science.
    Preventing fatal effects of overworking: Product design solution2018Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    “Overworking to death” is a phenomenon that has been noticeable in developing countries. The cause of death is mainly through ischemic strokes. While the victims’ occupations differed, they all shared a common characteristic, being positioned in a sedentary work, ranging from IT workers to doctors. This project’s aim was to develop a product that prevented or decreased the strokes that derived from sedentary overwork. This was mainly tackled by preventing one of the three causes of developing blood props, slowed blood flow. In order to gather rich data of the phenomenon, a qualitative study was conducted in China, during two months. By doing an extensive structured sampling, information rich data could be gathered during a short period of time. Data were derived from observations, questionnaires and an interview, which then was interpreted to customer needs and the final product specification. The final product became a trouser with an in built dynamic compression mechanic, that can compress the veins mostly during sitting activities, in order to prevent blood stasis. The compression mechanic works like the Chinese finger trap; compressing the calves while sitting and stretching the legs forward. It is made only out of polysaccharides fibres; cotton and corn.

    Download full text (pdf)
    PREVENTING FATAL EFFECTS OF OVERWORKING – PRODUCT DESIGN SOLUTION / Rahim_Adawi
  • 10.
    Adolfsson, Anton
    et al.
    University of Skövde, School of Engineering Science.
    Norelius, Mattias
    University of Skövde, School of Engineering Science.
    Reducering av kundreklamationer på ett tillverkande företag med hjälp av lean- och produktionstekniska verktyg2020Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Kinnarps is a company that manufactures office furniture and provides workplace solutions for offices and public environments. This project is performed at a manual workstation that packages table legs, this station is responsible for a significant amount of customer complaint costs due to wrong table legs being packaged and sent to the customers. The purpose of this project is to present suggestions for improvement that reduce the risk of packaging errors by using production tools and methods. To achieve the purpose of this project a data collection is to be performed by analyzing historical data and performing observations and interviews. After the data collection the cause of the event is to be found.Theory used to strengthen the choice of methods performed is presented in the theoretical frame of reference. Similar projects have also been studied and are presented in the literature review. The similar projects that were studied can in some way be related to this project and its conclusions.The empirical study was performed by analyzing historical data of the last years customer complaints costs, observations according to the gemba methodology, interviews and conversations with the staff. The costs of customer complaints for the last year was around 723 000 SEK. With the results of the performed methods an Ishikawa diagram was created to identify the causes of the packaging errors. The Ishikawa diagram combined with the theoretical frame of reference and literature review was used to develop three suggestions for improvement that help reduce the amount of customer complaints caused by packaging errors.All suggestions for improvement have been validated by analyzing the effectiveness, cost and the amount of work needed to implement the suggestions. The validations process resulted in a barcode scanner being the most suitable suggestion. By implementing a barcode scanner, the customer complaints could be reduced by an estimate of 92% which corresponds to saving around 665 000 SEK per year in customer complaint costs.

    Download full text (pdf)
    fulltext
  • 11.
    Agea, Andrés
    et al.
    University of Skövde, School of Technology and Society.
    Millán, Iván
    University of Skövde, School of Technology and Society.
    Range Extender for the Renault Fluence Z.E.: Choice of the engine and design of the structural support.2012Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Electric cars have appeared as an alternative to the big pollution caused by internal combustion engine cars. However, electric cars as the Renault Fluence Z.E. are not very sold in the market because of their small range of autonomy. To make this car an attractive option, it is necessary to add a range extender that extends its autonomy. This range extender is based in the addition of a small internal combustion engine to be attached only when the electric autonomy cannot fulfill the trip. A range extender is chosen by means of a comparison between different electric engines sold in the market. By means of a classification tree, the different places of the car where to mount it are compared and the most appropriate is chosen. By using Solidworks, a structure to support the engine and attach it to the car is designed. The result is a Range Extender device to mount in the hitch hook of the Renault Fluence Z.E. that provides an autonomy of around 665 km. This supposes a good solution for the owner of the Renault Fluence Z.E. who needs to cover trips of more than 180 km, the electric autonomy of this car.

    Download full text (pdf)
    Range Extender for the Renault Fluence Z.E.
  • 12.
    Agic, Adnan
    et al.
    Seco Tools AB, Fagersta, Sweden ; Department of Engineering Science, University West, Trollhättan, Sweden.
    Gutnichenko, Oleksandr
    Division of Production and Materials Engineering, Lund University, Sweden.
    Eynian, Mahdi
    Department of Engineering Science, University West, Trollhättan, Sweden.
    Ståhl, Jan-Eric
    Division of Production and Materials Engineering, Lund University, Sweden.
    Influence of cutting edge geometry on force build-up process in intermittent turning2016In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 46, p. 364-367Article in journal (Refereed)
    Abstract [en]

    In the intermittent turning and milling processes, during the entry phase the cutting edges are subjected to high impact loads that can give rise to dynamical and strength issues which in general cause tool life reduction. In this study the effect of geometrical features of the cutting tool on the force generation during the entry phase is investigated. Cutting forces are measured by a stiff dynamometer at a high sampling frequency. In addition, the chip load area is analyzed and related to the measured cutting force. The results show that micro-geometrical features, in particular the protection chamfer, significantly affect the force generation during the entry phase.

    Download full text (pdf)
    fulltext
  • 13.
    Ahmed, Adell
    University of Skövde, School of Engineering Science.
    Analys och simulering av produktionsflödet på ett tillverkningsföretag: Simulering kombinerat med Lean-principer2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Production concurrence within manufacturing companies is continuously increasing due to production requirements and demand of mass produced customized goods. In order to meet customers’ requirements nowadays, companies need to increase customize production without suffering a loss of quality. In pursuance of an increased production on the main shop floor of the industrial partner involved in this project, the company investigates the idea of investing in an automated pressing machine to centralize the process outside different assembly lines. With the help of automation, simulation, and Lean, the potential of the company to reduce lead times to satisfy the customer needs can be increased.

    The aim of this final year project is to investigate the potential of a stator pressing machine to manage the supply of product parts to four assembly lines. One of the requirements is that the yearly volume of the new system could be increased by 50%.

    The methodology used in this study is based on Lean, simulation, and optimization. In order to have an overview of the problem, a situation analysis was made on the current production flow. Therefore, a data collection process was performed through observations, continuous communication with matter experts, and historical data. This data was used to analyze the system and feed the simulation model of the proposed new system. Different Lean tools were also used for the analysis and improvement of the system.

    The company presented ideas on how they wanted the production flow to look like, which were then further developed and used as a basis for the improvement suggestions. One requirement was that the solution had to be Lean inspired.

    The aim of the study was achieved by creating a simulation model to test how the system would behave in different configurations. A first scenario designed as a Pull flow system where the products were only produced according to demand. The second scenario was a Push based system without considering just-in-time production. The first scenario was presented as suggestion for final solution.

    The result from the simulation scenarios showed a clear difference between the two systems. The Pull flow was more suitable due to a drastic decrease in both number of products as work- in-progress and lead time. The final solution, using a Kanban method, and a suggestion for the production layout of the future production flow is presented in the report.

  • 14.
    Akrouh Ettaghadouini, Samy
    University of Skövde, School of Engineering Science.
    Metamodelling of a Finite Element Analysis of a Drilling Process with Replaceable Inserts2019Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The aim of this project is to create a metamodel from a drilling tool with replaceable inserts from FEA of the machining process using MATLAB and ABAQUS. This report contains research in drilling and in metamodeling using neural networks and the work from the design of the CAD, through FEA and simulations, to the metamodeling, excluding the optimization.

    The work has resulted in a framework where a base FE model of the drill with two inserts that works, but due to time issues and given high cutting speed and feed the results of the FEA and the metamodeling are not very accurate. Therefore, the optimization analysis could not be done. However, it has been shown that feed has a major influence on the inserts temperature than the cutting speed, despite the higher range of this last one.

    Download full text (pdf)
    fulltext
  • 15.
    Al-Dabagh, Hussain
    et al.
    University of Skövde, School of Engineering Science.
    Wahlström, Daniel
    University of Skövde, School of Engineering Science.
    Konstruktion av gripverktyg för en kollaborativ robot2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This work is performed to use a collaborative robot in a mounting process with the aim of solving a type of hidden assembly, in which gear wheels should be synchronized. Because the parts are fragile and heavy, they become difficult for the assembler to handle, which can lead to damage to material or even worse the assembler. A gripping tool should therefore be designed to be used with a collaborative robot in this type of assembly. A comparison of collaborative robots is performed, based on two necessary requirements, where the robot's lifting capacity must be at least 10 kg and that the robots meet safety standards in a safety manner. Where the cobot KUKA LBR IIWA 14 meets these requirements and is considered to be most appropriate for carrying out the task. The robot has a lifting capacity of 14 kg, which means it can handle the gripping tool and the gearbox housing mass, the robot is also considered to be very easy to program. LBR iiwa is a very versatile robot and has no major deficits and therefore the choice of robot is considered to be well completed. A gripping tool has been designed and gone through different stages of development, from concept-generating ideas to design and choosing materials and making FEM analyses. Results suggest that selection of designs and materials on the gripping tool makes it approved for manufacturing and will handle the various loads the gripping tool will be exposed to in carrying out the task.

    Download full text (pdf)
    fulltext
  • 16.
    Alfredsson, K. Svante
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Biel, Anders
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Salimi, Saeed
    University of Skövde.
    Shear testing of thick adhesive layers using the ENF-specimen2015In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 62, p. 130-138Article in journal (Refereed)
  • 17.
    Alfredsson, K. Svante
    et al.
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Stigh, Ulf
    University of Skövde, School of Technology and Society. University of Skövde, The Virtual Systems Research Centre.
    Stability of beam-like fracture mechanics specimens2012In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 89, p. 98-113Article in journal (Refereed)
    Abstract [en]

    Test specimens used to determine the interlaminar strength of composites as well as the strength of adhesive layers are known to occasionally suffer from instability. Thus, even though the experiments are performed under controlled load-point displacement, the experiments are terminated prematurely by unstable crack propagation. Often there exists a critical crack length which must be exceeded in order to obtain stable crack propagation. In this paper, a general method to assess the stability of beam-like fracture mechanics specimens is developed. Both systems subjected to a single load and the more general situation with several independent loads are treated. A simple formula is derived for the critical crack length for one-parameter loading. The only parameter necessary as input is the compliance of the un-cracked specimen. For the case of non-proportional loading, stability is determined by studying the eigenvalues of a symmetric matrix. Other findings quantified in the paper are the effect of orthotropy, the influence of a flexible interphase layer and the influence of the compliance of the loading device.

  • 18.
    Alkureidi, Haifaa
    University of Skövde, School of Engineering Science.
    Investigations on Industrial Practice of Virtual Commissioning2020Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Thanks to the advent of Industrial 4.0, automation, digitization, design, manufacturing and the production processes, have become the key to success and the cornerstone of manufacturing and marketing. Given that production is in a profound transformation stage with increasing global demand for products with specific uses tailored to customized needs, processes are also required to stay sync. This goal requires the adoption of advanced and pioneering technologies, and Virtual Commissioning (VC) is one of these tools that seek to achieve the best level of efficiency and benefit from the available assets. Virtual commissioning allows comprehensive testing of automation applications and provides a realistic training environment for operators even before the start of the factory, where these advanced technologies help to improve operations and retain knowledge, which leads to a reduction in operating time and a significant reduction in marketing time. There are three contributions in this thesis: firstly, systematic review methodology is applied to survey literature related to VC and it is found that the incorporation of virtual commissioning technology into manufacturing and automation is a large and huge field and has been widely discussed today in many recent research and studies. Then an industrial questionnaire is designed and conducted, totally 30 questionnaire forms are collected. Through data analysis, it is concluded that the virtual commissioning is a topic that has a lot of potential but is still in an early stage with some challenges to overcome, the application of virtual commissioning and its adoption by companies needs many capabilities, such as the availability of skills that must be available such as: competence skill of the employee on smart product, digital operation, IT infrastructure, data security, automation, data analytic, data exchange, application systems, and collaborative software. Finally, the key players in VC solutions and the comparison of their products are provided as a reference for potential applications.

  • 19.
    Almaida Rodríguez, Germán
    et al.
    University of Skövde, School of Engineering Science.
    Cid Salmerón, Jose María
    University of Skövde, School of Engineering Science.
    Study of the influence of the angle between feed and flexibility direction on stability in milling: Experimental investigation of a theoretical prediction2023Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The study of this project has been carried out to analyse how the angle between feed direction and flexibility direction (𝜃 ) affects the milling process stability. Through this project, the aim is to determine whether the critical Depth of Cut (DOC) depends on 𝜃. In order to carry out this purpose, analytical and experimental results have been compared. The analytical calculations have been carried out to obtain the stability lobe diagram and a stability limit depending on 𝜃 , to compare them with four circular milling experiments. They increase continuously the DOC and also varies the Width of Cut (WOC), in addition different spindle speeds were utilized to perform them. The flexibility is fixed in the 𝑥 -axis and the feed direction changes continuously along the experiment, which allows the interaction between the critical DOC and all possible 𝜃 .The most relevant experiments were the second and third, as they showed the largest self-excited values. Moreover, it is determined that both analytical results correspond precisely, but it is considered that the experimental results do not match the analytical ones. No results are found that can be used to determine that 𝜃 influences the critical DOC. Furthermore, some results align with previous research in this field and some of them lead to future investigations.

  • 20.
    Almansa Fernández, Jesús Tomás
    et al.
    University of Skövde, School of Engineering Science.
    Vargas Maqueda, Juan Pablo
    University of Skövde, School of Health Sciences.
    Virtual commissioning with virtual reality2020Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The industry is nowadays going through a transformation in networking technologies which leads to what it is called Industry 4.0. This stage of the industry is arriving from the hand of the internet of things. Having connected all the elements within a factory allows to control and keep track of them telematically. Virtual commissioning is in charge of designing, testing and debugging the system before it is even built. This project tries to approach virtual reality to virtual commissioning and create the virtual model of a human in these simulated environments. Technology allows introducing human interaction for many purposes such as operator training. To do this project properly a methodology will be followed for the design and creation. Once the background, frame of reference and literature review are established, the development can start. The development of the project has taken place alongside Simumatik Open Emulation Platform, consisting of creating the body of a person, as simple as possible, following ergonomics, into this platform for commissioning purposes. The model will be able to interact with the virtual environment like robots, boxes, and sensors. To sum up, the complexity of the model will be limited to the inputs coming from the head and the hands. There exist infinite solutions for which position should be the rest of the body, therefore, this project aims to fix some variables to find valid solutions. Finally, the project achieved building a digital human model in which the main goal was building the arms that are estimated. The model is capable of interact with Simumatik´s environment that has been created specifically to show the functionalities of this project, being detected for sensors and robots of the system.

    Download full text (pdf)
    fulltext
  • 21.
    Almer Casino, Ana
    et al.
    University of Skövde, School of Engineering Science.
    Sempere Vicente, Miguel Ángel
    University of Skövde, School of Engineering Science.
    Autonomous medical robot2020Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Lack of healthcare assistance is one of the issues that European countries such as Sweden face due to the increase of the ageing phenomenon which leads to a higher demand for personnel in hospitals, basic attendance, and housing. Therefore, a tool is clearly required to fulfil these social needs. The thesis focuses on the elderly but especially on those with reduced mobility and develops a wheeled domestic mobile robot whose objective is to deliver their pills at the right time of the day. The main goal is the implementation of automatic drug delivery. The project presents a selection of the most suitable wheel-based robot, and a study and evaluation of different techniques and algorithms used for indoor positioning, navigation, facial recognition, and a communication interface between the patient and the robot.

    The robot used for the development of this thesis was the TurtleBot3 Burger and was evaluated upon a map created using the Hector SLAM method. Results showed that the Bluetooth technology (iBeacon), as well as the trilateration algorithm, are suitable choices for detecting a human in an indoor environment; a successful average drift error of 0.83 metres was obtained for indoor localization, and further results showed the facial recognition system achieved an accuracy of around 90%. It is concluded that the robot is capable of reaching and identifying the patient in an indoor environment, and so this project can be considered as the first step of implementation of a totally autonomous medical robot ready for domestic use.

    Download full text (pdf)
    fulltext
  • 22.
    Almqvist, Josefin
    et al.
    University of Skövde, School of Technology and Society.
    Sundelius, Emma
    University of Skövde, School of Technology and Society.
    Modular Locking System to RBS Cabinet2013Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Radio base stations contain equipment which enables the use of cell phones all around the world. ERICSSON is developing these stations and everything connected to the area, such as electronics, software and hardware. In a new project ERICSSON plans to make their hardware modular, to satisfy all their customers around the world even if their preferences differ. The task that was given to us was to develop a modular locking system to the radio base station cabinets.The concept was developed in an integrated working process that focused on a user centered final product. The process included the definition of the problem, preliminary studies of areas which are connected to the problem and a summary of the demands that the customers mediated in a list of requirements. The idea generation generated lots of ideas that later on were developed into different concepts. The concepts were evaluated before the final decision was made together with ERICSSON.The final product is a lifting handle connected to a rod and latch system, which already existed. A new mechanical function was created to make the new handle function with the old system. The locking system is modular and it is possible to choose which way to lock the handle, with a cylinder lock or a padlock. Only one module, the cylinder in the middle, needs to be switched to get the other solution. The other parts are the same; this makes the product modular. The lift handle is an entire new design, developed in the project.

    Download full text (pdf)
    fulltext
  • 23.
    Alsen, Felicia
    University of Skövde, School of Technology and Society.
    Rening med UV-ljus: Utvärdering av Aquatron drickvatten2012Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Download full text (pdf)
    Rening med UV-ljus
  • 24.
    Altrabulsy, Osama
    University of Skövde, School of Engineering Science.
    A Simulation-based Optimization Approach for Automated Vehicle Scheduling at Production Lines2019Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The world becomes more integrated and sophisticated, especially in the birth of advanced technologies, which have influenced all life aspects. Automated systems could be considered an example of those aspects, which have been affected by recent changes in today’s life. The competition in the market is putting increasing pressure on different manufacturing organizations to find the best methods that enable them to stay up to date with the latest technologies in the industrial field. One of the most famous dilemmas that exist in this field is designing an efficient and flexible material handling system. This issue draws the attention of both decision-makers in different companies and software developers who put considerable effort into making that desired system real. Inclusive research needs to be performed to obtain such a system, and the most significant part of the research that requires special attention is the applied methodology.The approach to be adapted determines the degree of stability of a particular material handling system to function effectively in the case studied. Several methods are available and could be implemented to design that effective system such as meta-heuristic algorithms, and approaches that depend on simulation software tools. The latter approach, which is the simulation approach, seems to get increasing attention from developers of the industrial system since it plays a vital role in reducing the cost and preserving available resources. Besides, it helps predict future changes and scenarios of the system to be analyzed.In this project, a discrete-event simulation model was built for the proposed layout of the main shop floor owned by a Swedish manufacturing company. The corporation located in the south of Sweden, and it produces a vast range of manufacture of goods. The chosen methodology is a combination of lean, simulation, and optimization approaches. It has been implemented on the proposed layout in which material is handled into production lines by using automated guided vehicles (AGVs) as a means of transportation. The analysis of results shows potential benefits, where the production process became more efficient and organized since the operational cost has been reduced by decreasing the number of required vehicles. Moreover, the simulation approach facilitated testing new ideas and designing improved scenarios without the necessity to change the current state of the factory layout or disturbing the regular activities.

    Download full text (pdf)
    fulltext
  • 25.
    AMOR MUÑOZ, ANTONIO
    et al.
    University of Skövde, School of Engineering Science.
    FERNANDEZ CRANZ, MATIAS
    University of Skövde, School of Engineering Science.
    SIMULATION AND EVALUATION OF WORK CONDITIONS OF HEALTHCARE PERSONNEL USING DHM TOOLS AND MOTION CAPTURE SYSTEMS2020Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Work-Related Musculoskeletal Disorders (WMSDs) are a common occupational health problem among healthcare workers. The emergence of new technologies such as motion capture offers a new approach to the study of the work conditions. This research studies the situation of nurses and surgeons both through the use of motion capture and traditional manual modelling of digital manikins. The research has been carried out through the study of six tasks, four of which performed by nurses and two by surgeons. Tasks have been selected after a literature review and interviews with surgeons and nurses. The six tasks have been evaluated using two software: Jack Tecnomatix, whose input was manual modelling of manikins following observational techniques; and IPS IMMA, whose input was motion capture files captured through Xsens Motion Trackers Awinda and processed with MVN Analyze. Results indicated that the tasks analysed were potentially harmful to workers, being the trunk and upper limb regions the ones that comprised higher levels of risk.

    Download full text (pdf)
    fulltext
  • 26.
    Amouzgar, Kaveh
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Metamodel Based Multi-Objective Optimization with Finite-Element Applications2018Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    As a result of the increase in accessibility of computational resources and the increase of computer power during the last two decades, designers are able to create computer models to simulate the behavior of complex products. To address global competitiveness, companies are forced to optimize the design of their products and production processes. Optimizing the design and production very often need several runs of computationally expensive simulation models. Therefore, integrating metamodels, as an efficient and sufficiently accurate approximate of the simulation model, with optimization algorithms is necessary. Furthermore, in most of engineering problems, more than one objective function has to be optimized, leading to multi-objective optimization(MOO). However, the urge to employ metamodels in MOO, i.e., metamodel based MOO (MB-MOO), is more substantial.Radial basis functions (RBF) is one of the most popular metamodeling methods. In this thesis, a new approach to constructing RBF with the bias to beset a priori by using the normal equation is proposed. The performance of the suggested approach is compared to the classic RBF and four other well-known metamodeling methods, in terms of accuracy, efficiency and, most importantly, suitability for integration with MOO evolutionary algorithms. It has been found that the proposed approach is accurate in most of the test functions, and it was the fastest compared to other methods. Additionally, the new approach is the most suitable method for MB-MOO, when integrated with evolutionary algorithms. The proposed approach is integrated with the strength Pareto evolutionary algorithm (SPEA2) and applied to two real-world engineering problems: MB-MOO of the disk brake system of a heavy truck, and the metal cutting process in a turning operation. Thereafter, the Pareto-optimal fronts are obtained and the results are presented. The MB-MOO in both case studies has been found to be an efficient and effective method. To validate the results of the latter MB-MOO case study, a framework for automated finite element (FE) simulation based MOO (SB-MOO) of machining processes is developed and presented by applying it to the same metal cutting process in a turning operation. It has been proved that the framework is effective in achieving the MOO of machining processes based on actual FE simulations.

    Download full text (pdf)
    Spikblad
    Download (pdf)
    omslag
    Download (pdf)
    fulltext
  • 27.
    Amouzgar, Kaveh
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Bandaru, Sunith
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Andersson, Tobias J.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos H. C.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    A framework for simulation based multi-objective optimization and knowledge discovery of machining process2018In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 98, no 9-12, p. 2469-2486Article in journal (Refereed)
    Download full text (pdf)
    fulltext
  • 28.
    Amouzgar, Kaveh
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Bandaru, Sunith
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Andersson, Tobias J.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos H. C.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Metamodel based multi-objective optimization of a turning process by using finite element simulationManuscript (preprint) (Other academic)
    Abstract [en]

    This study investigates the advantages and potentials of the metamodelbased multi-objective optimization (MOO) of a turning operation through the application of finite element simulations and evolutionary algorithms to a metal cutting process. The objectives are minimizing the interface temperature and tool wear depth obtained from FE simulations using DEFORM2D software, and maximizing the material removal rate. Tool geometry and process parameters are considered as the input variables. Seven metamodelling methods are employed and evaluated, based on accuracy and suitability. Radial basis functions with a priori bias and Kriging are chosen to model tool–chip interface temperature and tool wear depth, respectively. The non-dominated solutions are found using the strength Pareto evolutionary algorithm SPEA2 and compared with the non-dominated front obtained from pure simulation-based MOO. The metamodel-based MOO method is not only advantageous in terms of reducing the computational time by 70%, but is also able to discover 31 new non-dominated solutions over simulation-based MOO.

  • 29.
    Amouzgar, Kaveh
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Bandaru, Sunith
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Andersson, Tobias
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Ng, Amos H. C.
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Metamodel based multi-objective optimization of a turning process by using finite element simulation2020In: Engineering optimization (Print), ISSN 0305-215X, E-ISSN 1029-0273, Vol. 52, no 7, p. 1261-1278Article in journal (Refereed)
    Abstract [en]

    This study investigates the advantages and potentials of the metamodelbased multi-objective optimization (MOO) of a turning operation through the application of finite element simulations and evolutionary algorithms to a metal cutting process. The objectives are minimizing the interface temperature and tool wear depth obtained from FE simulations using DEFORM2D software, and maximizing the material removal rate. Tool geometry and process parameters are considered as the input variables. Seven metamodelling methods are employed and evaluated, based on accuracy and suitability. Radial basis functions with a priori bias and Kriging are chosen to model tool–chip interface temperature and tool wear depth, respectively. The non-dominated solutions are found using the strength Pareto evolutionary algorithm SPEA2 and compared with the non-dominated front obtained from pure simulation-based MOO. The metamodel-based MOO method is not only advantageous in terms of reducing the computational time by 70%, but is also able to discover 31 new non-dominated solutions over simulation-based MOO.

    Download full text (pdf)
    fulltext
  • 30.
    Amouzgar, Kaveh
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Bandaru, Sunith
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos H. C.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Radial basis functions with a priori bias as surrogate models: A comparative study2018In: Engineering applications of artificial intelligence, ISSN 0952-1976, E-ISSN 1873-6769, Vol. 71, p. 28-44Article in journal (Refereed)
    Abstract [en]

    Radial basis functions are augmented with a posteriori bias in order to perform robustly when used as metamodels. Recently, it has been proposed that the bias can simply be set a priori by using the normal equation, i.e., the bias becomes the corresponding regression model. In this study, we demonstrate the performance of the suggested approach (RBFpri) with four other well-known metamodeling methods; Kriging, support vector regression, neural network and multivariate adaptive regression. The performance of the five methods is investigated by a comparative study, using 19 mathematical test functions, with five different degrees of dimensionality and sampling size for each function. The performance is evaluated by root mean squared error representing the accuracy, rank error representing the suitability of metamodels when coupled with evolutionary optimization algorithms, training time representing the efficiency and variation of root mean squared error representing the robustness. Furthermore, a rigorous statistical analysis of performance metrics is performed. The results show that the proposed radial basis function with a priori bias achieved the best performance in most of the experiments in terms of all three metrics. When considering the statistical analysis results, the proposed approach again behaved the best, while Kriging was relatively as accurate and support vector regression was almost as fast as RBFpri. The proposed RBF is proven to be the most suitable method in predicting the ranking among pairs of solutions utilized in evolutionary algorithms. Finally, the comparison study is carried out on a real-world engineering optimization problem.

  • 31.
    Amouzgar, Kaveh
    et al.
    School of Engineering, Jönköping University, Sweden.
    Cenanovic, Mirza
    School of Engineering, Jönköping University, Sweden.
    Salomonsson, Kent
    School of Engineering, Jönköping University, Sweden.
    Multi-objective optimization of material model parameters of an adhesive layer by using SPEA22015In: Advances in structural and multidisciplinary optimization: Proceedings of the 11th World Congress of Structural and Multidisciplinary Optimization (WCSMO-11), June7-12, 2015, Sydney, Australia / [ed] Qing Li; Grant P. Steven; Zhongpu (Leo) Zhang, The International Society for Structural and Multidisciplinary Optimization (ISSMO) , 2015, p. 249-254Conference paper (Refereed)
    Abstract [en]

    The usage of multi material structures in industry, especially in the automotive industry are increasing. To overcome the difficulties in joining these structures, adhesives have several benefits over traditional joining methods. Therefore, accurate simulations of the entire process of fracture including the adhesive layer is crucial. In this paper, material parameters of a previously developed meso mechanical finite element (FE) model of a thin adhesive layer are optimized using the Strength Pareto Evolutionary Algorithm (SPEA2). Objective functions are defined as the error between experimental data and simulation data. The experimental data is provided by previously performed experiments where an adhesive layer was loaded in monotonically increasing peel and shear. Two objective functions are dependent on 9 model parameters (decision variables) in total and are evaluated by running two FEsimulations, one is loading the adhesive layer in peel and the other in shear. The original study converted the two objective functions into one function that resulted in one optimal solution. In this study, however, a Pareto frontis obtained by employing the SPEA2 algorithm. Thus, more insight into the material model, objective functions, optimal solutions and decision space is acquired using the Pareto front. We compare the results and show good agreement with the experimental data.

  • 32.
    Amouzgar, Kaveh
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Ng, Amos H. C.
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment. Division of Industrial Engineering and Management, Uppsala University, Sweden.
    Ljustina, Goran
    Volvo Car Corporation, ME PS Research and Technology, Skövde, Sweden.
    Optimizing index positions on CNC tool magazines considering cutting tool life and duplicates2020In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 93, p. 1508-1513Article in journal (Refereed)
    Abstract [en]

    Minimizing the non-machining time of CNC machines requires optimal positioning of cutting tools on indexes (stations) of CNC machine turret magazine. This work presents a genetic algorithm with a novel solution representation and genetic operators to find the best possible index positions while tool duplicates and tools life are taken in to account during the process. The tool allocation in a machining process of a crankshaft with 10 cutting operations, on a 45-index magazine, is optimized for the entire life of the tools on the magazine. The tool-indexing time is considerably reduced compared to the current index positions being used in an automotive factory. 

    Download full text (pdf)
    fulltext
  • 33.
    Amouzgar, Kaveh
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment. Division of Industrial Engineering and Management, Uppsala University.
    Nourmohammadi, Amir
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Ng, Amos H. C.
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment. Division of Industrial Engineering and Management, Uppsala University.
    Multi-objective optimisation of tool indexing problem: a mathematical model and a modified genetic algorithm2021In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 59, no 12, p. 3572-3590Article in journal (Refereed)
    Abstract [en]

    Machining process efficiencies can be improved by minimising the non-machining time, thereby resulting in short operation cycles. In automatic-machining centres, this is realised via optimum cutting tool allocation on turret-magazine indices – the “tool-indexing problem”. Extant literature simplifies TIP as a single-objective optimisation problem by considering minimisation of only the tool-indexing time. In contrast, this study aims to address the multi-objective optimisation tool indexing problem (MOOTIP) by identifying changes that must be made to current industrial settings as an additional objective. Furthermore, tool duplicates and lifespan have been considered. In addition, a novel mathematical model is proposed for solving MOOTIP. Given the complexity of the problem, the authors suggest the use of a modified strength Pareto evolutionary algorithm combined with a customised environment-selection mechanism. The proposed approach attained a uniform distribution of solutions to realise the above objectives. Additionally, a customised solution representation was developed along with corresponding genetic operators to ensure the feasibility of solutions obtained. Results obtained in this study demonstrate the realization of not only a significant (70%) reduction in non-machining time but also a set of tradeoff solutions for decision makers to manage their tools more efficiently compared to current practices. 

    Download full text (pdf)
    fulltext
  • 34.
    Amouzgar, Kaveh
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. Product Development Department, School of Engineering, Jönköping University, Jönköping, Sweden.
    Strömberg, Niclas
    Department of Mechanical Engineering, School of Science and Technology, University of Örebro, Sweden.
    Radial basis functions as surrogate models with a priori bias in comparison with a posteriori bias2017In: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 55, no 4, p. 1453-1469Article in journal (Refereed)
    Abstract [en]

    In order to obtain a robust performance, the established approach when using radial basis function networks (RBF) as metamodels is to add a posteriori bias which is defined by extra orthogonality constraints. We mean that this is not needed, instead the bias can simply be set a priori by using the normal equation, i.e. the bias becomes the corresponding regression model. In this paper we demonstrate that the performance of our suggested approach with a priori bias is in general as good as, or even for many test examples better than, the performance of RBF with a posteriori bias. Using our approach, it is clear that the global response is modelled with the bias and that the details are captured with radial basis functions. The accuracy of the two approaches are investigated by using multiple test functions with different degrees of dimensionality. Furthermore, several modeling criteria, such as the type of radial basis functions used in the RBFs, dimension of the test functions, sampling techniques and size of samples, are considered to study their affect on the performance of the approaches. The power of RBF with a priori bias for surrogate based design optimization is also demonstrated by solving an established engineering benchmark of a welded beam and another benchmark for different sampling sets generated by successive screening, random, Latin hypercube and Hammersley sampling, respectively. The results obtained by evaluation of the performance metrics, the modeling criteria and the presented optimal solutions, demonstrate promising potentials of our RBF with a priori bias, in addition to the simplicity and straight-forward use of the approach.

    Download full text (pdf)
    fulltext
  • 35.
    Ander, Jenny
    et al.
    University of Skövde, School of Engineering Science.
    Johansson, Matilda
    University of Skövde, School of Engineering Science.
    Utveckling av laddhandske för laddbara fordon2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    During the autumn term of 2017, Jenny Ander and Matilda Johansson have performed a project in collaboration with Sea Ice AB in the course Degree Project in Integrated Product Development at the University of Skövde. Sea Ice AB is working on developing charging infrastructure systems for rechargeable vehicles with focus on end-user benefits, high quality and increasing sustainability for the environment.The company is aiming to grow larger in the market and, in the future, be able to deliver attractive products and services, which in this project has involved the development of a new vehicle connector for rechargeable vehicles.

    During the project, vehicle connectors and CEE-plugs have been compared with each other, focusing on its internal components. The pre-study is based on literature studies where standards have been studied, ergonomics and user studies, questionnaires, electrical measurements, but mainly disassembly and analysis of vehicle connectors and CEE-plugs.

    After the pre-study, the concept development of the vehicle connector began with design methods, FEA-analyzes, CAD and clay modeling, concept screening and detail design. The concept development resulted in a complete final concept for both internal components, but also an external shell with ergonomic grip surfaces and angles.

    The final concept has been compared to the requirement specification and achieved the requirements set for the project, with some reservation for continued development. The vehicle connector has a unique and appealing appearance and meets the demands that both users and Sea Ice AB whished for.

  • 36.
    Andersen, Ann-Louise
    et al.
    Industrial Product Development, Production and Design, School of Engineering, Jönköping University, Sweden ; Department of Materials and Production, Aalborg University, Denmark.
    Rösiö, Carin
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment. Industrial Product Development, Production and Design, School of Engineering, Jönköping University, Sweden.
    Continuing Engineering Education in Changeable and Reconfigurable Manufacturing – Implications of Problem-Based Learning in Industrial Practice2023In: International Journal of Engineering Education, ISSN 0949-149X, Vol. 39, no 5, p. 1118-1130Article in journal (Refereed)
    Abstract [en]

    Increasingly volatile and complex manufacturing environments make the continuous development of engineering professionals’ knowledge and competences in changeable and reconfigurable manufacturing a major source of competitiveness in manufacturing companies. Enablers of this include modular and platform-based product and manufacturing system design, as well as industry 4.0 related technologies and digitalisation. Therefore, this paper focuses on Continuing Engineering Education (CEE) in changeable and reconfigurable manufacturing and investigates the implications of applying a university-industry collaborative approach to Problem-based Learning (PBL) for CEE in company-settings. The paper builds on a four-year CEE initiative from Swedish manufacturing industry and includes insights from implementing a CEE course in changeable manufacturing, which was designed based on PBL principles and run as an industry-university cooperation for four consecutive years. Implications addressed in the paper relates to (1) PBL as a suitable approach for CEE, (2) Research transfer to industry through PBL-based CEE, and (3) industry-university collaboration for CEE, which provides valuable insights on how to conduct successful CEE in knowledge fields that are fast evolving in order to enable fast industry transitions. # 2023 TEMPUS Publications.

  • 37.
    Andersson, Angelica
    et al.
    Division of Experimental Mechanics, Luleå University of Technology, Sweden.
    Runnemalm, Anna
    Division of Experimental Mechanics, Luleå University of Technology, Sweden.
    Sjödahl, Mikael
    Division of Experimental Mechanics, Luleå University of Technology, Sweden.
    Digital speckle-pattern interferometry: fringe retrieval for large in-plane deformations with digital speckle photography1999In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 38, no 25, p. 5408-5412Article in journal (Refereed)
    Abstract [en]

    The compensation of large in-plane motions in digital speckle-pattern interferometry (DSPI) with the use of digital speckle photography (DSP) is demonstrated. Ordinary recordings of DSPI are recombined and analyzed with DSP. The DSP result is used to compensate for the bulk speckle motion prior to calculation of the phase map. This results in a high fringe contrast even for deformations of several speckle diameters. In addition, for the case of an in-plane deformation, it is shown that the absolute phase change in each pixel may be unwrapped by use of the DSP result as an initial guess. The principles of this method and experiments showing the in-plane rotation of a plate and the encounter of two rounded plates are presented.

  • 38.
    Andersson, Daniel
    et al.
    University of Skövde, School of Engineering Science. andersson.daniel89@gmail.com.
    Andersson, David
    University of Skövde, School of Engineering Science. davdii_@live.com.
    Produktionseffektivisering med hjälp av flödessimulering och förbättringsarbete2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    AB Furhoffs Rostfria is a company with its base in Skövde. They are specialists in the manufacturing of stainless-steel parts, such as plumbing products, floor wells and sinks. In addition to manufacturing their own products, the company also has a subcontract to manufacture other companies’ products.

    The department where this bachelor thesis will be conducted has a subcontract to manufacturing radar cones and treats only the production of the most frequent manufactured radar cones. The department consists of seven manufacturing steps and three additional steps for one of the details.

    The purpose of the bachelor thesis is to create a simulation model that shows how potential improvement proposals would meet the expected increase of the order intake of the radar cones by streamlining the current production flow. In order to achieve this, a simulation model has been created in which the improvement proposals have been implemented. The improvement proposals that have been tested are based on the data that has been collected through production engineering methods.

    The frame of references describes the theory that constitutes the foundation for the chosen methods. In addition, areas within discrete event simulation, lean production and improvement work have been studied from other works in the literature review. These areas can in some way relate to the work and conclusions of this project.

    The empirical study was conducted by using observations according to genchi genbutsu, conversations and interviews with operators, spaghetti diagrams of the operators and the product flow as well as time studies according to the continuous method. These methods have formed the basis for both the creation of the simulation model, where the current situation is reflected, and for the development of the future state simulation model. The future state simulation model shows the implementation of the improvement proposals that increases efficiency and production volume throughout the system.

    The empirical study resulted in a visual overview of the production flow, standard times, the identification of waste as well as improvement proposals. When all the improvement proposals were implemented, the hourly production was increased by 26.6% and the lead time was reduced by 21.1%. With these improvements, the company can increase their production and profit significantly.

    Download full text (pdf)
    fulltext
  • 39.
    Andersson, Emil
    University of Skövde, School of Engineering Science.
    Optimization and re-design of a wheel hub to reduce unsprung mass of a rallycross car2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Wheel Hub of a rallycross car is analysed to reduce the unsprung mass of the car. The problem statement is to mainly focus on the unsprung mass related to the suspension, and more specifically on the Wheel Hub. One of the objectives of the suspension system of a car is to damping the movement of the car. This is an important area when designing a vehicle, and especially a race car due to the extreme conditions that may result in reduced traction and loose of confidence for the driver. A theoretical model is performed to demonstrate the importance of a low unsprung mass and to illustrate how it affects the vehicle-handling. A process to evaluate the current Wheel Hub and decision to re-design the Wheel Hub is performed, and the parts are analysed using the Finite Element Method to verify the design and material selection. Vehicle dynamics of the car is analysed to calculate the acting forces. Optimization of the design is performed by using Computer Aided Engineering. The re-designed Wheel Hub presented as the result of this project with a Brake Disk Adapter integrated in Hub. This design reduces the number of parts, and the unsprung mass up to 25% without any effects on suspension geometry or other parts of the car.

    Download full text (pdf)
    fulltext
  • 40.
    Andersson, Emilia
    University of Skövde, School of Technology and Society.
    Utveckling av vippgunga för barn i åldrarna 1-3 år2013Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    During the spring of 2013, Emilia Andersson, a student in product design engineering at University of Skövde, carried out a product development project in cooperation with HAGS Aneby AB. The aim of the project was to develop a seesaw adapted for children aged 1-3 years. The goal was to develop a seesaw that could be sold worldwide and meet the American standard and European standard for playground equipment.

    The project began with a pre study and a theory phase, which included literature review and competitor analysis and information were gathered to gain a deeper knowledge of the subject. Later on ideas and concepts were generated, which then through evaluations as user testing lead to a final concept. The concept was evaluated with for example strength calculations and an anthropometric analysis.

    The final seesaw can, despite adjustment for the age group, not only be use by 1-3-year-olds, but also by older children, this thanks to the design and the handles that provide extra play values.

    Download full text (pdf)
    Utveckling av vippgunga för barn i åldrarna 1-3 år
  • 41.
    Andersson, Johanna
    et al.
    University of Skövde, School of Engineering Science.
    Marwén, Kristin
    University of Skövde, School of Engineering Science.
    Analys av tunn rostfri hylsa i klämförband2020Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The examined sleeve is made of material AISI 440B and has the purpose of acting as a reinforced wear surface in a 3D applicator for example sealants and glue. The sleeve should prevent wear in the swivel mechanism of the applicator, and is therefore hardened to obtain a hard surface which can resist the abrasive substances flowing through the applicator. The sleeve has been investigated in order to find critical points that can be optimized for further competitive product. An independent analysis of the construction of the sleeve was therefore made without regard to previous work. Since the information regarding the use was scarce, the work was limited from studies of wear and transportation. Therefore, only manufacturing, assembly and construction were studied.

    The causes of failure were proved to be very individual as it was difficult to determine when and how often a failure could occur. It was unknown how long the product has been used as well as what kind of materials has flown through the 3D applicator in different industries. This meant that the construction of the sleeve was examined through methods such as "walk to gemba", "Finite Element Method" and visual inspection. FE analyse examined the impact of the assembly process on the strength and provides an overview of the stress distributions in the sleeve. The visual inspection was applied to obtain an understanding of the origin of the crack in the sleeve as well as mapping the crack propagation.

    The result of investigation and analysis showed that the following critical parameters were detected:

    • The literature study showed that hardening and machining of the sleeve is critical in different ways for the strength
    • The roundness of the sleeve risks varying impermissibly during assembly
    • The adhesive risks to not performing any function
    • The cracks could be derived to start in the holes of the examined sleeve.
    • Causes of cracking cannot be determined.
    • The FE analysis of the assembly process did not indicate any weakening in the construction and no stresses were calculated to exceed the breaking limit.

    The concluding discussion resulted in a number of proposals for further work. Some suggestions (among other things) were to investigate the effect of roundness in interference-fit, exchange of materials and tribology.

    Download full text (pdf)
    fulltext
  • 42.
    Andersson, Johanna
    et al.
    University of Skövde, School of Technology and Society.
    Thyberg, Terese
    University of Skövde, School of Technology and Society.
    Chefsrekrytering: Hur fungerar det?2007Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Recruitment can include everything from hiring a stand-in for the summer to finding an executive for a big company. When hiring an executive is it important for the company that the right person gets the right job. There is little information in Swedish literature that explains how executive recruitment separates from ordinary recruitment. Neither is there any information about how internal and external executive recruitment are separated.

    When a recruitment process starts it is important to do a thorough preparatory work. This can be done by doing a work analyse, or a revision of the job description which is mostly used in executive recruitment. After this a specification of requirements is formed, the specification is a guide that the company uses to specify what kind of person they want to hire.

    The search of candidates for a position can be done in several different ways. The company has to decide if they should do the process by themselves or if a recruitment firm should be consulted, which is common today. There are several ways of searching candidates, the most common today is advertising in different media or using the employment service. The company also have to make a decision considering if the search should be done internal or external, or both ways.

    When suitable candidates have been chosen it is time for interviews and testing. At this time the recruiter meets the candidate for the first time and creates a picture of him or her. Testing is often used as a complement to the interview to confirm or deny feelings or suspicions that has arisen during the process. Another way of doing this is by contacting references, it is important to be aware of the fact that references often just have good things to say about the candidate. There is a risk with this considering that the whole truth might not come out.

    There are many different ways of making the decision who to hire, most important is though to use the specification of requirements as basic data. It is not always a need that all demands in the specifications are fulfilled, the candidates other qualifications can be more important.

    During this study it has come to our knowledge that the recruitment process for hiring executives are not that different from the process of hiring other co-workers. The biggest difference is that companies often choose to outsource the process to a consult. The companies in this study are quite small and think that they don’t have the right competence to find people with the right qualifications themselves. They think that it is better to pay money to the consultant than risk that the recruitment goes wrong and they have to do the process all over again.

    Companies today are more interested in recruiting executives from outside the company. In a time of changes they want an objective point of view to be able to survive in business. Once again there are no right or wrong way for the company to choose, but to search both internal and external might be the best solution to minimize the risk of overlooking the best candidate. Being able to advance in the company is a big push for many employees to work harder.

    Download full text (pdf)
    FULLTEXT01
  • 43.
    Andersson Lassila, Andreas
    et al.
    University of Skövde, School of Engineering Science.
    Folcke, Marcus
    University of Skövde, School of Engineering Science.
    Numerical and experimental analysis of adhesively bonded T-joints: Using a bi-material interface and cohesive zone modelling2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    With increasing climate change the automotive industry is facing increasing demands regarding emissions and environmental impact. To lower emissions and environmental impact the automotive industry strives to increase the efficiency of vehicles by for example reducing the weight. This can be achieved by the implementation of lightweight products made of composite materials where different materials must be joined. A key technology when producing lightweight products is adhesive joining.

    In an effort to expand the implementations of structural adhesives Volvo Buses wants to increase their knowledge about adhesive joining techniques. This thesis is done in collaboration with Volvo Buses and aims to increase the knowledge about numerical simulations of adhesively bonded joints. A numerical model of an adhesively bonded T-joint is presented where the adhesive layer is modelled using the Cohesive Zone Model. The experimental extraction of cohesive laws for adhesives is discussed and implemented as bi-linear traction-separation laws. Experiments of the T-joint for two different load cases are performed and compared to the results of the numerical simulations. The experimental results shows a similar force-displacement response as for the results of the numerical simulations. Although there were deviations in the maximum applied load and for one load case there were deviations in the behavior after the main load drop. The deviations between numerical and experimental results are believed to be due to inaccurate material properties for the adhesive, the use of insufficient bi-linear cohesive laws, the occurrence of a combination of adhesive and cohesive fractures during the experiments and dissimilar effective bonding surface areas in the numerical model and the physical specimens.

    Download full text (pdf)
    Numerical and experimental analysis of adhesively bonded T-joints
  • 44.
    Andersson Lassila, Andreas
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Svensson, Daniel
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Wang, Wei
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Andersson, Tobias
    University of Skövde, School of Engineering Science. University of Skövde, Virtual Engineering Research Environment.
    Numerical evaluation of cutting strategies for thin-walled parts2024In: Scientific Reports, E-ISSN 2045-2322, Vol. 14, no 1, article id 1459Article in journal (Refereed)
    Abstract [en]

    Static form errors due to in-process deflections is a major concern in flank milling of thin-walled parts. To increase both productivity and part geometric accuracy, there is a need to predict and control these form errors. In this work, a modelling framework for prediction of the cutting force-induced form errors, or thickness errors, during flank milling of a thin-walled workpiece is proposed. The modelled workpiece geometry is continuously updated to account for material removal and the reduced stiffness matrix is calculated for nodes in the engagement zone. The proposed modelling framework is able to predict the resulting thickness errors for a thin-walled plate which is cut on both sides. Several cutting strategies and cut patterns using constant z-level finishing are studied. The modelling framework is used to investigate the effect of different cut patterns, machining allowance, cutting tools and cutting parameters on the resulting thickness errors. The framework is experimentally validated for various cutting sequences and cutting parameters. The predicted thickness errors closely correspond to the experimental results. It is shown from numerical evaluations that the selection of an appropriate cut pattern is crucial in order to reduce the thickness error. Furthermore, it is shown that an increased machining allowance gives a decreased thickness error for thin-walled plates.

    Download full text (pdf)
    fulltext
  • 45.
    Andersson, Linna
    et al.
    University of Skövde, School of Engineering Science.
    Bergström, Ellinor
    University of Skövde, School of Engineering Science.
    Utveckling av portabel mobilhållare som hjälpmedel vid e-möten och distansundervisning2018Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of the degree project is to methodically develop a product that will serve as an accessory for a smartphones during documentation. A preliminary study was done to gain a deeper knowledge and understanding of digital meeting rooms, how a camera works and what resolution is. With the information gathered, the work went on to a literature study on additive manufacturing, how a product can be designed and printed digitally. The preliminary study resulted in a requirement specification that formed the basis for concept generation and later a result.

     The result was a prototype of a lightweight and portable holder for smartphones that is 3D-printable and made out of only one material, which provides good recycling opportunities for the user. The prototype fulfills most of the sub-goals that were set up early and the main purpose of the project could also be met.

    Download full text (pdf)
    fulltext
  • 46.
    Andersson, Louise
    et al.
    University of Skövde, School of Engineering Science.
    Erlandsson, Stefan
    University of Skövde, School of Engineering Science.
    Utveckling av ett lyftverktyg för skivformade produkter2014Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    During the second semester of 2013, product design engineering students Stefan Erlandsson and Louise Andersson have been involved in a project in cooperation with entrepreneur Lars Willebrand. The main objective of this project has been to develop a lifting tool for sheet materials. The lifting tool is one of four different products developed by Lars Willebrand. The line of products also includes an overhead crane, a slewing crane and a storage drawer for metal sheets, which are already fully developed and ready for production. The purpose of this lifting tool is to be used along with the storage drawer which means that is has to be optimised for lifting sheet materials from different heights. This means that the lifting tool has to be designed with regards to the users working postures. Human factors such as ergonomics have to be taken into account as well.

    The initial part of the project is a pre-study with focus on ergonomics and human factors. This pre-study included a study in relevant literature, contact with a manufacturing company and an analysis of the possible competitor’s lifting tools. The results from the pre-study have further been used to define the specification of requirements, which is the foundation for the concept development. The concept development has undergone a number of different phases. All of the lifting tool’s main functions were broken down and developed individually. The functions were as follows; adjustment of the suction cups, lifting from different heights and handling. The most suitable solution for each main function were chosen and assembled into one final concept.

    The final concept has been analysed and further developed in order to please the employer and the users of the lifting tool. Some details in the design have been changed in order to ease the manufacturing of the lifting tool. To ensure that the final concept matches the specification of requirements, strength calculations and FEM analysis have been made and anthropometrical measurements have been taken into account. The final chapters include a discussion and recommendations for further development of the lifting tool.

    Download full text (pdf)
    Utveckling av ett lyftverktyg för skivformade produkter
  • 47.
    Andersson, Marie
    et al.
    University of Skövde, School of Technology and Society.
    Fredricsson, Sandra
    University of Skövde, School of Technology and Society.
    Effektivitetsmätning: En studie kring privata företags inre effektivitet2007Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Effektivitetsmätning är ett ständigt aktuellt ämne som intresserar många företag. Historiskt sett har denna mätning begränsats till ekonomiska aspekter, men i dagens samhälle räcker inte det. För att hänga med i den allt hårdare konkurrensen mellan företagen måste effektivitetsmätningen täcka upp organisationens samtliga aktiviteter. Utifrån teorier om effektivitet, mål och mått har det därför undersökts hur privata företag arbetar med den inre effektivitetsmätningen, samt hur detta kan appliceras på tjänste- och systemutvecklingsföretaget Aptic AB.

    Denna kvalitativa studie baseras på sju intervjuer genomförda på olika företag som alla har använt sig av effektivitetsmätningar i flera år. För att få en överblick av Aptic AB:s behov av liknande effektivitetsmätningar intervjuades även två personer från denna organisation. Intervjuerna var halvstrukturerade med öppna frågor för att respondenterna skulle ha möjlighet att ta upp det som de själva tyckte var viktigt.

    Empirin visar att effektivitet kan mätas genom att sätta upp mål inom områden som ekonomi, kvalitet, leveranssäkerhet, medarbetare, säkerhet, miljö och förbättringar, för att sedan utföra mätningar som visar hur verksamheten ligger till i förhållande till det. Eftersom samtliga företag ansåg att effektivitetsmätning är en viktig del i organisationens överlevnad på längre sikt, så rekommenderas även Aptic AB att påbörja detta arbete.

    Download full text (pdf)
    FULLTEXT01
  • 48.
    Andersson, Martin
    University of Skövde, School of Technology and Society.
    Industrial scheduling with evolutionary algorithms using a hybrid representation2011Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Scheduling problems have been studied extensively in the literature but because they are so hard to solve, especially real-world problems, it is still interesting to find ways of solving them more efficiently. This thesis aims to efficiently solve a real-world scheduling problem by using a hybrid representation together with an optimisation algorithm. The aim of the hybrid representation is to allow the optimisation to focus on the parts of the scheduling problem where it can make the most improvement. The new approach used in this thesis to accomplish this goal, is the combination of simulation-based optimisation using genetic algorithms and dispatching rules. By using this approach, it is possible to investigate the effect of putting specified job sequences in certain machines and using dispatching rules in the other. The hypothesis is that the optimisation can use dispatching rules on non-bottleneck machines that have little impact on the overall performance of the line and some specified job sequences on bottleneck machines that are hard to be scheduled efficiently with dispatching rules. This would allow the optimisation to focus on the bottleneck machines and that would produce a more efficient search. The results from the case study shows it is a viable approach exceeding or equalling existing techniques. The hypothesis that the optimisation can focus its efforts is supported by a bottleneck analysis which corresponds with the experimental results from optimisations.

    Download full text (pdf)
    fulltext
  • 49.
    Andersson, Martin
    et al.
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Syberfeldt, Anna
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Ng, Amos
    University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre.
    Bengtsson, Victor
    Posten AB, Solna, Sweden.
    Evolutionary Simulation Optimization of Personnel Scheduling2014In: 12th International Industrial Simulation Conference 2014: ISC'2014 / [ed] Amos Ng; Anna Syberfeldt, Eurosis , 2014, p. 61-65Conference paper (Refereed)
    Abstract [en]

    This paper presents a simulation-optimization system for personnel scheduling. The system is developed for the Swedish postal services and aims at finding personnel schedules that minimizes both total man hours and the administrative burden of the person responsible for handling schedules. For the optimization, the multi-objective evolutionary algorithm NSGA-II is implemented. The simulation-optimization system is evaluated on a real-world test case and results from the evaluation shows that the algorithm is successful in optimizing the problem.

  • 50.
    Andersson, My
    University of Skövde, School of Engineering Science.
    Human-robot collaboration on an assembly station with the ability to work reverse2020Independent thesis Advanced level (degree of Master (One Year)), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    The automation level of today’s industries is categorized as high. Some specific areas cannot be fully automated, such as manual assembly operations. Manual assembly stations often require high flexibility due to variation in products and product types, and some operations also require human finesse for conducting the operations. A collaborative robot is produced to facilitate for the worker during operations and tasks, which can be categorized as non-ergonomically and repetitive. The technical specification for the collaborative robots is not yet fully developed, and therefore it might be hard to create a safe work environment.

    Design and creation is the research strategy used for the project, much due to the aim of creating something physical. The project aims to establish a demonstrator, and introduce a collaborative robot, a UR5 for human-robot collaboration for a manual assembly operations with the ability to work reverse. The fictional workflows implemented in the demonstrator are established with influence from real manual assembly operations and parts included in an engine of a truck. The widgets identified and included in the workflows are created and 3D-printed. The main goal for the project is to establish a collaboration between the worker and the robot and create a baseline for a future safety evaluation conducted on the demonstrator. The project included identification of equipment and widgets necessary, the layout of the demonstrator, workflow establishment for both assembly and disassembly, together with the configuration of the equipment and programming of the collaborative robot.

    Safety standards concerning robots and collaborative robots, together with the technical specification not yet fully developed, worked as a base during the establishment of the workflow, configuration of the equipment, and programming of the robot.

    The established workflow can work both for assembly and disassembly. The workflow includes tasks that are performed separately, together, and simultaneous on the same workpiece. Experiments have been conducted on the established workflows, and observations conducted on the tasks performed. Aspects, such as time consumption for individual tasks, risk identification of quasi-static and transient contacts, and gripper position have been included during the observation.

    Download full text (pdf)
    fulltext
1234567 1 - 50 of 967
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • apa-cv
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf