his.sePublikasjoner
Endre søk
Begrens søket
1234567 151 - 200 of 474
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 151.
    Frydén, Cecilia
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Omri, Nadia
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Effektivisering av konstruktörens arbete i produktutvecklingsprocessen med hjälp av 3D-modeller och detaljritningar2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    I kursen Examensarbete i integrerad produktutveckling har ett projekt utförts av designingenjörsstudenterna Cecilia Frydén och Nadia Omri våren 2017 på Högskolan i Skövde. Projektet genomfördes i samarbete med konsultföretaget ÅF Industry AB i Skövde och några av deras externa tillverkare. I ÅF:s produkt-utvecklingsprocess ägnar konstruktörerna många timmar åt att framställa tillverkningsunderlag, 3D-modeller och detaljritningar. Tillverkningsunderlagen misstänks innehålla överflödig information som inte används av tillverkarna, vilket innebär att konstruktören ägnar tid åt arbetsmoment i onödan. Av den anledningen vill ÅF att det undersöks vilken information i tillverknings-underlaget som är överflödig och att alternativ på hur det utformas tas fram. Aktionsforskning är den övergripande metodiken som används. Projektet har varit fokuserat på att kartlägga arbetsflödet, identifiera mottagarna av tillverkningsunderlaget och deras behov samt definiera tekniska möjligheter för att generera lösningsförslag på alternativa arbetsmetoder. Lösningsförslagen har utvärderats med både konstruktörer och med mottagarna hos tillverkarna. Utifrån utvärderingarna har ett lösningsförslag valts som består av en 3D-modell med Model Based Definition (MBD) där Product Manufacturing Information (PMI) reducerats och förmedlas tillsammans med en 3D-PDF.

  • 152.
    Furulind, Johan
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Berg, Johan
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Feasibility Study for a Wind Power Project in Sri Lanka: a Minor Field Study2008Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report covers a feasibility study for a wind power project in Sri Lanka. Three potential sites for a wind farm are presented, out of which the Ambewela Cattle Farm is chosen as the most suitable. Limitations of a wind farm at the site, due to properties of the electrical grid and logistical issues, are examined and costs related to installing the wind farm are estimated. The maximum capacity of a wind farm is calculated to 45 MW. The payback period of the wind farm is calculated to 4.4 years. Environmental benefits of the wind farm are estimated in terms of avoided CO2-emissions, which are calculated to 76 000 metric tonnes per year. The study concludes that a wind power project at the chosen site should be technically and financially feasible, if a wind turbine that matches certain logistical criteria can be found.

     

  • 153.
    Galar, Diego
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Luleå University of Technology, Luleå, Sweden.
    Kans, Mirka
    Linnaeus University, Kalmar, Sweden.
    Schmidt, Bernard
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Big Data in Asset Management: Knowledge Discovery in Asset Data by the Means of Data Mining2016Inngår i: Proceedings of the 10th World Congress on Engineering Asset Management (WCEAM 2015) / [ed] Kari T. Koskinen, Helena Kortelainen, Jussi Aaltonen,Teuvo Uusitalo, Kari Komonen, Joseph Mathew, Jouko Laitinen, Springer, 2016, s. 161-171Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Assets are complex mixes of complex systems, built from components which, over time, may fail. The ability to quickly and efficiently determine the cause of failures and propose optimum maintenance decisions, while minimizing the need for human intervention is necessary. Thus, for complex assets, much information needs to be captured and mined to assess the overall condition of the whole system. Therefore the integration of asset information is required to get an accurate health assessment of the whole system, and determine the probability of a shutdown or slowdown. Moreover, the data collected are not only huge but often dispersed across independent systems that are difficult to access, fuse and mine due to disparate nature and granularity. If the data from these independent systems are combined into a common correlated data source, this new set of information could add value to the individual data sources by the means of data mining. This paper proposes a knowledge discovery process based on CRISP-DM for failure diagnosis using big data sets. The process is exemplified by applying it on railway infrastructure assets. The proposed framework implies a progress beyond the state of the art in the development of Big Data technologies in the fields of Knowledge Discovery algorithms from heterogeneous data sources, scalable data structures, real-time communications and visualizations techniques.

  • 154.
    Galindo Aranda, Patricia Cristina
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Bottleneck analysis using reverse-score: An experimental study2019Independent thesis Advanced level (degree of Master (One Year)), 12 poäng / 18 hpOppgave
    Abstract [en]

    There are manufacturing systems all over the world and all of them present dif- ferent characteristics. To get close to those manufacturing systems and aid them to analyze data and improve their efficiency, it arises FACTS Analyzer®. The present project concerns the development of a bottleneck analysis using REVERSE- SCORE (Simulation based COnstraint REmoval), feature included in FACTS Ana- lyzer. It is used Simulation-based Multi-Objective Optimization (SMO) to ana- lyze the different variables of a production line and investigate how to best extend previous application of SMO for bottleneck detection to not only consider im- provements of system parameters but also degradations of them. Degrading some system parameters can have many hidden advantages such as reduce power con- sumption, increase material efficiency or lengthen the useful life of the machines or tools, advantages that can draw near sustainability.

  • 155.
    Gandhi, Kanika
    et al.
    Bhavan’s Usha & Lakshmi Mittal Institute of Management, New Delhi, India.
    Goyal, Kirit
    Gazelle Information Technologies, New Delhi, India.
    Jha, Abhinav
    Gazelle Information Technologies, New Delhi, India.
    A Fuzzy Multi-Criteria Optimization Model for Allocating SKU and Suppliers in SC System2016Inngår i: Retail Marketing in India: Trends and Future Insights / [ed] Anshu Gupta, Kartik Dave, Emerald Group Publishing (India) , 2016, s. 117-129Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    Supply chain stakeholders are increasingly paying attention to the optimal design of their supply chains because of several reasons like increasing production cost, reducing product life cycles, shrinking resources, and environmental sustainability. There has been greater emphasis on environmental concerns whilst designing the supply chains because of emerging government legislation in this domain and pressure from society.As a result, supply chain partners need to analyse their operations more critically. This study proposes a strategic decision-making model considering the operational costs caused by coordination and optimization of the sustainable supply chain design to satisfy the demand at retailers. In the study, an integrated supplier selection, procurement,inventory control and transportation model is discussed that helps in evaluating the suppliers, determining optimum quantity to procure, choosing transportation vehicle type along with managing environmental issues, obtaining optimal stock keeping units(SKU) and safety stock for each product category to fulfil a specified service level for retailers at minimum cost for the next planning horizon. The model demonstrates that how demand at retailer drives the full supply chain coordination and selection of distribution centre. The model has been validated through a case study.

  • 156.
    Gandhi, Kanika
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Machine maintenance decision support system: A systematic literature review2018Inngår i: Advances in Manufacturing Technology XXXII: Proceedings of the 16th International Conference on Manufacturing Research, incorporating the 33rd National Conference on Manufacturing Research, September 11 – 13, 2018, Skövde, Sweden / [ed] Peter Thorvald, Keith Case, Amsterdam: IOS Press, 2018, s. 349-354Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Growing competition market situations have emerged the requirement of the real-time data, understanding data behaviour, and maintenance actions in the manufacturing system. The future decision-making process in manufacturing needs to be more flexible to adapt to various methods for maintenance decision support systems (MDSS). This paper classifies various application areas of MDSS through a systemic literature review. Specifically, it identifies the relationship between the machine maintenance areas and the processes in which it integrates different tools and techniques to develop MDSS. The accumulated information helps in analyzing trends and shortcomings to concentrate the efforts for future research work. The reviewed papers are selected based on the contents, application tool assessments and clustered by their application areas. Furthermore, it proposes a structure outlined based on the functional knowledge as well as the information flow design during the development of MDSS, along with the relationship among application areas.

  • 157.
    Garay, Beñat
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    High-level language design for IMMA-Virtual Driver DHM Research2015Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    The growing implementation of ergonomics in the automotive sector sets high demands on Digital Human Modelling (DHM) functionalities towards the simulation of more realistic environments and the reduction of physical model dependency. During the current degree project a leading element that smartly assembles DHM usage (implementation of high-level commanding languages) was designed, revolving around the industries’ needs which were gathered and interpreted in order to organize current functions in this language and suggest new complementary functions that would create a language environment suitable for non-expert users. This was achieved by focusing in an intuitive word-function structure, the proposal of defaults and other tools that aid users with different kinds of expertise. The need for realism of simulations was assessed by the language design especially by designing means to coordinate synchronic manikin-actions. 

  • 158.
    Garcia Rivera, Francisco
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Hoyos Rodriguez, David
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Implementation of Metallic Profiles in Social Houses2018Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    This paper presents a metallic structural solution for communities with minor resources, which is able to adapt to the climatic conditions of La Guajira (Colombia). The mains objectives of this structure are to reach good quality and reduce execution time as well as cost.

    The structure was designed by using Light Weight Steel Framing method, due to its simplicity as well as its ease in the assembly due to the lack of resources in those communities. The design was calculated by using an iterative method in which a compromise solution between prices and strength was reached.

    This paper concludes that the same structure which was being built, can be improved (decreasing of the price, and industrialisation of the method) by using the structural solution proposed by this work.

  • 159.
    Gastañares, Xabier
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Bastida, Iñaki
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Evaluation of virtual confidence: turn-table model & mechatronic concept designer2018Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    This work presents an evaluation of the virtual confidence that can be achieved in the software Mechatronic Concept Designer. The virtual confidence is defined as the reliability that a model or software offer, based on their capacity to replicate reality accurately. Reference system for the evaluation is a turn table used at AB Volvo in the production of front lids. After conducting the simulations and different kind of analyses (such as friction analyses), the main conclusion has been that both the original model and the software offered some limitations that made a high level of virtual confidence impossible. Taking into account this fact, future improvement lines have been suggested. 

  • 160.
    Gerdes, Mike
    et al.
    Aero - Aircraft Design and Systems Group, Hamburg University of Applied Sciences, Hamburg, Germany.
    Galar, Diego
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Division of Operation and Maintenance Engineering, Luleå University of Technology, Luleå, Sweden.
    Fuzzy condition monitoring of recirculation fans and filters2016Inngår i: International Journal of Systems Assurance Engineering and Management, ISSN 0975-6809, E-ISSN 0976-4348, Vol. 7, nr 4, s. 469-479Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A reliable condition monitoring is needed to be able to predict faults. Pattern recognition technologies are often used for finding patterns in complex systems. Condition monitoring can also benefit from pattern recognition. Many pattern recognition technologies however only output the classification of the data sample but do not output any information about classes that are also very similar to the input vector. This paper presents a concept for pattern recognition that outputs similarity values for decision trees. Experiments confirmed that the method works and showed good classification results. Different fuzzy functions were evaluated to show how the method can be adapted to different problems. The concept can be used on top of any normal decision tree algorithms and is independent of the learning algorithm. The goal is to have the probabilities of a sample belonging to each class. Performed experiments showed that the concept is reliable and it also works with decision tree forests (which is shown during this paper) to increase the classification accuracy. Overall the presented concept has the same classification accuracy than a normal decision tree but it offers the user more information about how certain the classification is.

  • 161.
    Gerdes, Mike
    et al.
    Hamburg University of Applied Sciences Aero - Aircraft Design and Systems Group, Hamburg, Germany / Luleå University of Technology, Division of Operation and Maintenance Engineering, Luleå, Sweden.
    Galar, Diego
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Luleå University of Technology, Division of Operation and Maintenance Engineering, Luleå, Sweden.
    Scholz, Dieter
    Hamburg University of Applied Sciences Aero - Aircraft Design and Systems Group, Hamburg, Germany.
    Decision Trees and the Effects of Feature Extraction Parameters for Robust Sensor Network Design2017Inngår i: Eksploatacja i Niezawodnosc - Maintenance and Reliability, ISSN 1507-2711, Vol. 19, nr 1, s. 31-42Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Reliable sensors and information are required for reliable condition monitoring. Complex systems are commonly monitored by many sensors for health assessment and operation purposes. When one of the sensors fails, the current state of the system cannot be calculated in same reliable way or the information about the current state will not be complete. Condition monitoring can still be used with an incomplete state, but the results may not represent the true condition of the system. This is especially true if the failed sensor monitors an important system parameter. There are two possibilities to handle sensor failure. One is to make the monitoring more complex by enabling it to work better with incomplete data; the other is to introduce hard or software redundancy. Sensor reliability is a critical part of a system. Not all sensors can be made redundant because of space, cost or environmental constraints. Sensors delivering significant information about the system state need to be redundant, but an error of less important sensors is acceptable. This paper shows how to calculate the significance of the information that a sensor gives about a system by using signal processing and decision trees. It also shows how signal processing parameters influence the classification rate of a decision tree and, thus, the information. Decision trees are used to calculate and order the features based on the information gain of each feature. During the method validation, they are used for failure classification to show the influence of different features on the classification performance. The paper concludes by analysing the results of experiments showing how the method can classy different errors with a 75% probability and how different feature extraction options influence the information gain.

  • 162.
    Ghobakhloo, Morteza
    et al.
    Department of Industrial Engineering, Minab Higher Educational Center, University of Hormozgan, Bandar Abbas, Iran.
    Azar, Adel
    Department of Management and Economics, Tarbiat Modares University, Tehran, Iran.
    Fathi, Masood
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Lean-green manufacturing: the enabling role of information technology resource2018Inngår i: Kybernetes, ISSN 0368-492X, E-ISSN 1758-7883, Vol. 47, nr 9, s. 1752-1777Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose – The purpose of this paper is to contribute to the existing knowledge about the relationships between information technology (IT), lean manufacturing (LM), organizational environmental issues and business performance.

    Design/methodology/approach – A questionnaire-based survey was conducted to collect data from 122 elite manufacturers, and the hypothesized relationships were tested using partial least squares structural equation modeling. Findings – IT competence in LM acts as a lower-order organizational capability, and its business value should be recognized through the intermediate roles of LM effectiveness and environmental management capability. Findings recommend that the net benefits of LM are mainly materialized through waste and pollution reduction and simplified implementation of proactive environmental practices.

    Research limitations/implications – Among other limitations, relying on a rather small sample size and cross-sectional data of this research, and lack of generalizability of findings, tends to have certain limitations. An interesting direction for future research would be to extend this research by assessing interaction of other types of IT resources with LM and organizational environmental issues.

    Practical implications – Both LM and proactive environmental management are information-intensive. Investment in both technological and human aspects of IT resource aimed at increasing the effectiveness of LM activities and proactive environmental practices is imperative for contemporary manufacturers.

    Originality/value – This study introduces the IT capability of IT competence in LM and two organizational capabilities of LM effectiveness and environmental management capability. By doing so, the study highlights the significant role of organizational environmental issues in devising firms’ IT and advanced manufacturing technology investment strategies in LM context.

  • 163.
    Ghobakhloo, Morteza
    et al.
    Department of Industrial Engineering, University of Hormozgan, Bandar Abbas, Iran / Department of Mechanical and Manufacturing Engineering, University Putra Malaysia, Serdang, Malaysia.
    Fathi, Masood
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Corporate survival in Industry 4.0 era: the enabling role of lean-digitized manufacturing2019Inngår i: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    purpose– The study demonstrates how small manufacturing firms can leverage their Information Technology (IT) resources to develop the lean-digitized manufacturing system that offers sustained competitiveness in the Industry 4.0 era.

    Design/methodology/approach – The study performs an in-depth 5-years case study of a manufacturing firm, and reports its journey from failure in the implementation of enterprise resource planning to its success in integrating IT-based technology trends of Industry 4.0 with the firm’s core capabilities and competencies while pursuing manufacturing digitization.

    Findings – Industry 4.0 transition requires the organizational integration of many IT-based modern technologies and the digitization of entire value chains. However, Industry 4.0 transition for smaller manufacturers can begin with digitization of certain areas of operations in support of organizational core strategies. Development of leandigitized manufacturing system is a viable business strategy for corporate survivability in the Industry 4.0 setting.

    Research limitations/implications – Although the implementation of lean-digitized manufacturing system is costly and challenging, this manufacturing strategy offers superior corporate competitiveness in the long run. Since this finding is rather limited to the present case study, assessing the business value of lean-digitized manufacturing system in a larger-scale research context would be an interesting avenue for future research.

    Practical implications – Industry 4.0 transition for typical manufacturers should commensurate with their organizational, operational, and technical particularities. Digitization of certain operations and processes, when aligned with the firm’s core strategies, capabilities, and procedures, can offer superior competitiveness even in Industry 4.0 era, meaning that the strategic plan for successful Industry 4.0 transition is idiosyncratic to each particular manufacturer.

    Social implications – Manufacturing digitization can have deep social implications as it alters inter and intra organizational relationships, causes unemployment among low-skilled workforce, and raises data security and privacy concerns. Manufacturers should take responsibility for their digitization process and steer it in a direction that simultaneously safeguards economic, social, and environmental sustainability.

    Originality/value – The strategic roadmap devised and employed by the case company for managing its digitization process can better reveal what manufacturing digitization, mandated by Industry 4.0, might require of typical manufacturers, and further enable them to better facilitate their digital transformation process.

  • 164.
    Ghobakhloo, Morteza
    et al.
    Department of Industrial Engineering, Minab Higher Educational Center, University of Hormozgan, Bandar Abbas, Iran.
    Fathi, Masood
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Fontes, Dalila Benedita Machado Martins
    Faculty of Economics, Universidade do Porto, Porto, Portugal.
    Ching, Ng Tan
    Department of Mechanical and Material Engineering, Universiti Tunku Abdul Rahman - Kuala Lumpur Campus, Kuala Lumpur, Malaysia.
    Modeling lean manufacturing success2018Inngår i: Journal of Modelling in Management, ISSN 1746-5664, E-ISSN 1746-5672, Vol. 13, nr 4, s. 908-931Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Purpose – The purpose of this study is to contribute to the existing knowledge about the process ofachieving Lean Manufacturing (LM) success.

    Design/methodology/approach – This study uses interpretive structural modeling and captures theopinions of a group of LM experts from a world-class Japanese automobile manufacturer, to map theinterrelationships among potential determinants of LM success. This study further uses the data from asurvey of 122 leading automobile part manufacturers by performing structural equation modeling toempirically test the research model proposed.

    Findings – Management support and commitment, financial resources availability, information technologycompetence for LM, human resources management, production process simplicity, supportive culture andsupply chain-wide integration are the key determinants that directly or indirectly determine the level ofachievement of LMsuccess.

    Research limitations/implications – The determinants of LM success as experienced by Asianautomobile manufacturers might be different from determinants of LM success as experienced byWestern automobile manufacturers. An interesting direction for future research would be to capturethe experts’ inputs from Western automobile manufacturers to complement the findings of thisstudy.

    Practical implications – The practical contribution of this study lays in the development of linkagesamong various LM success determinants. Utility of the proposed interpretive structural modeling andstructural equation modeling methodologies imposing order, direction and significance of therelationships among elements of LM success assumes considerable value to the decision-makers and LMpractitioners.

    Originality/value – Building on opinions of a group of LM experts and a case study of leading auto partmanufacturers, the present study strives to model the success of LM, a topic that has received little attentionto date.

  • 165.
    Goienetxea, Ainhoa
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H.C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Division of Industrial Engineering and Management, Department of Engineering Science, Uppsala University, Sweden.
    Urenda Moris, Matías
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Division of Industrial Engineering and Management, Department of Engineering Science, Uppsala University, Sweden.
    Bringing together Lean and simulation: a comprehensive review2019Inngår i: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588XArtikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Lean is and will still be one of the most popular management philosophies in the Industry 4.0 context and simulation is one of its key technologies. Many authors discuss about the benefits of combining Lean and simulation to better support decision makers in system design and improvement. However, there is a lack of reviews in the domain. Therefore, this paper presents a four-stage comprehensive review and analysis of existing literature on their combination. The aim is to identify the state of the art, existing methods and frameworks for combining Lean and simulation, while also identifying key research perspectives and challenges. The main trends identified are the increased interest in the combination of Lean and simulation in the Industry 4.0 context and in their combination with optimisation, Six Sigma, as well as sustainability. The number of articles in these areas is likely to continue to grow. On the other hand, we highlight six gaps found in the literature regarding the combination of Lean and simulation, which may induce new research opportunities. Existing technical, organisational, as well as people and culture related challenges on the combination of Lean and simulation are also discussed.

  • 166.
    Goienetxea Uriarte, Ainhoa
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Bringing Together Lean, Simulation and Optimization: Defining a framework to support decision-making in system design and improvement2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The rapid changes in the market including globalization, the requirement for personalizedproducts and services by the customers, shorter product life-cycles, the exponential growthof technological advances, and the demographical changes, will demand organizations toeffectively improve and design their systems in order to survive. This is the actual paradigmcharacterizing the industrial and service sectors. This scenario presents a considerablechallenge to decision makers who will need to decide about how to design and improve amore than ever complex system without compromising the quality of the decision taken.Lean, being a widely applied management philosophy with very powerful principles, itsmethods and tools are static in nature and have some limitations when it comes to the designand improvement of complex and dynamic systems. Some authors have proposed thecombined use of simulation with Lean in order to overcome these limitations. Furthermore,optimization and post-optimization tools coupled to simulation, provide knowledge aboutoptimal or nearly optimal system configurations to choose from. However, even if Leanprinciples, methods and tools, as well as simulation and optimization, pursue the objectiveof supporting organizations regarding system design and improvement, a bilateral approachfor their combination and its benefits have barely been addressed in the literature.Many studies focus only on how specific Lean tools and simulation can be combined, treatingLean purely as a toolbox and not considering how Lean can support the simulation process.The aim of this research is to address this knowledge gap by analyzing the mutualbenefits and presenting a framework for combining Lean, simulation and optimization tobetter support decision makers in system design and improvement where the limitationsof Lean tools and simulation are overcome by their combination. This framework includesa conceptual framework explaining the relationships between the Lean philosophy, methodsand tools with simulation and optimization; the purposes for this combination and stepby step processes to achieve these purposes; the identification of the roles involved in eachprocess; a maturity model providing guidelines on how to implement the framework; existingbarriers for the implementation; and ethical considerations to take into account. Anindustrial handbook has also been written which explains how to deploy the framework.The research has been conducted in three main stages including an analysis of the literatureand the real-world needs, the definition and formulation of the framework, and finally, itsevaluation in real-world projects and with subject matter experts. The main contributionof this research is the reflection provided on the bilateral benefits of the combination, aswell as the defined and evaluated framework, which will support decision makers take qualitydecisions in system design and improvement even in complex scenarios.

  • 167.
    Goienetxea Uriarte, Ainhoa
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Bringing together Lean, simulation and optimization in a framework for system design and improvement2018Inngår i: Proceedings of the Winter Simulation Conference, Gothenburg, 9-12 December, 2018 / [ed] M. Rabe, A. A. Juan, N. Mustafee, A. Skoogh, S. Jain, B. Johansson, Piscataway, New Jersey: IEEE, 2018, s. 4132-4133Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Is it beneficial to combine lean, simulation and optimization? And if so, how can they be combined for decision-making support in system design and improvement? This research proposes a framework that sets the basis for achieving beneficial interactions between the lean philosophy, methods and tools, and simulation-based optimization. A framework that gives the users the possibility to get better system understanding, conduct a deeper system analysis, and attain an optimal system design and improvement, and thereby, get better foundation for sustainable long time improvement. The framework has been tested in several realworld case studies. Moreover, surveys have been conducted to evaluate the perception of subject matter experts about its usefulness, as well as its usability and perceived quality by end users and decision makers, all of them reporting very positive results.

  • 168.
    Goienetxea Uriarte, Ainhoa
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Urenda Moris, Matías
    Division of Industrial Engineering and Management, Department of Engineering Science, Uppsala University, Uppsala, Sweden.
    Supporting the lean journey with simulation and optimization in the context of Industry 4.02018Inngår i: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 25, s. 586-593Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The new industrial revolution brings important changes to organizations that will need to adapt their machines, systems and employees’ competences to sustain their business in a highly competitive market. Management philosophies such as lean will also need to adapt to the improvement possibilities that Industry 4.0 brings. This paper presents a review on the role of lean and simulation in the context of Industry 4.0. Additionally, the paper presents a conceptual framework where simulation and optimization will make the lean approach more efficient, speeding up system improvements and reconfiguration, by means of an enhanced decision-making process and supported organizational learning.

  • 169.
    Goienetxea Uriarte, Ainhoa
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ruiz Zúñiga, Enrique
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Urenda Moris, Matías
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    How can decision makers be supported in the improvement of an emergency department?: A simulation, optimization and data mining approach2017Inngår i: Operations Research for Health Care, ISSN 2211-6923, E-ISSN 2211-6931, Vol. 15, s. 102-122Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The improvement of emergency department processes involves the need to take into considerationmultiple variables and objectives in a highly dynamic and unpredictable environment, which makes thedecision-making task extremely challenging. The use of different methodologies and tools to support thedecision-making process is therefore a key issue. This article presents a novel approach in healthcarein which Discrete Event Simulation, Simulation-Based Multi-Objective Optimization and Data Miningtechniques are used in combination. This methodology has been applied for a system improvementanalysis in a Swedish emergency department. As a result of the project, the decision makers were providedwith a range of nearly optimal solutions and design rules which reduce considerably the length of stayand waiting times for emergency department patients. These solutions include the optimal number ofresources and the required level of improvement in key processes. The article presents and discussesthe benefits achieved by applying this methodology, which has proven to be remarkably valuable fordecision-making support, with regard to complex healthcare system design and improvement.

  • 170.
    Goienetxea Uriarte, Ainhoa
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ruiz Zúñiga, Enrique
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Urenda Moris, Matías
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    System design and improvement of an emergency department using Simulation-Based Multi-Objective Optimization2015Inngår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 616, nr 1, artikkel-id 012015Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Discrete Event Simulation (DES) is nowadays widely used to support decision makers in system analysis and improvement. However, the use of simulation for improving stochastic logistic processes is not common among healthcare providers. The process of improving healthcare systems involves the necessity to deal with trade-off optimal solutions that take into consideration a multiple number of variables and objectives. Complementing DES with Multi-Objective Optimization (SMO) creates a superior base for finding these solutions and in consequence, facilitates the decision-making process. This paper presents how SMO has been applied for system improvement analysis in a Swedish Emergency Department (ED). A significant number of input variables, constraints and objectives were considered when defining the optimization problem. As a result of the project, the decision makers were provided with a range of optimal solutions which reduces considerably the length of stay and waiting times for the ED patients. SMO has proved to be an appropriate technique to support healthcare system design and improvement processes. A key factor for the success of this project has been the involvement and engagement of the stakeholders during the whole process.

  • 171.
    Goienetxea Uriarte, Ainhoa
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Sellgren, Tommy
    Volvo Car Corporation.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Urenda Moris, Matías
    Uppsala University.
    Introducing simulation and optimization in the Lean continuous improvement standards in an automotive company2019Inngår i: Proceedings of the Winter Simulation Conference, Gothenburg, December 9-12, 2018 / [ed] M. Rabe, A. A. Juan, N. Mustafee, A. Skoogh, S. Jain, B. Johansson, Piscataway, New Jersey: IEEE, 2019, s. 3352-3363Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The highly competitive automobile market requires automotive companies to become efficient by continuously improving their production systems. This paper presents a case study where simulationbased optimization (SBO) was employed as a step within a Value Stream Mapping event. The aim of the study was to promote the use of SBO to strengthen the continuous improvement work of the company. The paper presents all the key steps performed in the study, including the challenges faced and a reflection on how to introduce SBO as a powerful tool within the lean continuous improvement standards.

  • 172.
    Goienetxea Uriarte, Ainhoa
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Urenda Moris, Matías
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Oscarsson, Jan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Lean, Simulation and Optimization: A Win-Win combination2016Inngår i: Proceedings of the 2015 Winter Simulation Conference / [ed] L. Yilmaz, W. K. V. Chan, I. Moon, T. M. K. Roeder, C. Macal, and M. D. Rossetti, Piscataway, New Jersey: IEEE Computer Society, 2016, s. 2227-2238Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Lean and simulation analysis are driven by the same objective, how to better design and improve processes making the companies more competitive. The adoption of lean has been widely spread in companies from public to private sectors and simulation is nowadays becoming more and more popular. Several authors have pointed out the benefits of combining simulation and lean, however, they are still rarely used together in practice. Optimization as an additional technique to this combination is even a more powerful approach especially when designing and improving complex processes with multiple conflicting objectives. This paper presents the mutual benefits that are gained when combining lean, simulation and optimization and how they overcome each other´s limitations. A framework including the three concepts, some of the barriers for its implementation and a real-world industrial example are also described.

  • 173.
    González Albea, Estela
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Redesign of retro van for being used in city tours2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
  • 174.
    Gudfinnsson, Kristens
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Strand, Mattias
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    On transforming into the data-driven decision-making era: current state of practice in manufacturing smes2018Inngår i: Advances in Manufacturing Technology XXXII: Proceedings of the 16th International Conference on Manufacturing Research, incorporating the 33rd National Conference on Manufacturing Research, September 11–13, 2018, University of Skövde, Sweden / [ed] Peter Thorvald, Keith Case, Amsterdam: IOS Press, 2018, Vol. 8, s. 337-342Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Current research lacks details on how SMMEs are able to capitalize on how their IT-solutions supports data-driven decision-making. Such details are important for being able to support further development of SMMEs and assuring their sustainability and competitive edge. Prosperous SMMEs are vital due to their economical and societal importance. To alleviate the lack of details, this paper presents the results of four case studies towards SMMEs partly aimed at investigating their current state of data-driven decision-making. The findings reveal that IT-solutions in some areas are either underdeveloped or unexplored. Instead, the SMMEs tend to focus on traditional manufacturing techniques, continuous improvements in the manufacturing process, and manual support routines and thereby neglects opportunities offered in relation to e.g. incident management, product quality monitoring, and the usage of KPIs not directly linked to manufacturing.

  • 175.
    Guerrero-Strachan Kerr, Gonzalo
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Martín Márquez, Leonardo
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    CHANGING AN ENGINE FEEDING SYSTEM FROM ACONVENTIONAL ONE TO LPG STUDY2012Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    In this project the feasibility of installing a LPG feeding system on a conventional petrol engine has been evaluated from the performance, economic and environmental points of view. With the purpose of determining if the LPG fuel is a strong alternative to the petrol or diesel fuels which are the most commonly used.

    For the performance study, a number of hypotheses and average values have been used for the calculations, which have provided us some coherent results that gives an approximate idea of how the vehicle is going to work after being equipped with an LPG feeding system.

    The economical study has been made using a combination between the kilometers traveled during a year and the type of use that the vehicle is subjected to. To determine the most representative scenarios, comparing these costs with the cost of the conversion kit installation, several conclusions are obtained. As an illustrative example, a typical route between two cities in Sweden has been considered.

    The environmental study has been a comparison between LPG and other conventional fuels based on theoretical sources. In this study the different types of emission compounds are described, several statistical data is provided and the bases of the European Auto Oil II Programme are also described.

    To illustrate this work a particular car model suitable for this type of conversion has been chosen. Considering the specific characteristics of the engine the most appropriate LPG feeding system have been chosen, including a detailed description of it.

    In conclusion, the goals for this project have been successfully achieved. The results are satisfactory and could be used as a basic informative guideline about LPG and its use as an alternative fuel.

  • 176.
    Guil López, Alejandro
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Guerrero Valadez, Isabel María
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Design of a set of stool and table with a sustainable approach by using DFA and DFE principles2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    This report covers the conduction of a final thesis project for the University of Skövde in collaboration with Carlos Jimenez Design studio (Spain).

    The aim of this project was to design and present a set of furniture consisting in a high stool and a high chair of a similar nature to the ones which are usually found in bars, oriented to the domestic environment and to the Scandinavian market.

    The main special characteristic of this project is that the design has been carried out with a focus on environmental sustainability, which has been approached in such a way that assembly has a big part in it, which at the same time relates to user experience. Therefore, the project combines design for assembly (DFA), design for environment (DFE) and user experience design (UXD) in such a way that all the approaches taken for each of these factors are interrelated in complete and thorough design process, were all the aspects of the final product have been taken into account.

  • 177.
    Gunnarsson Ljungblom, Joel
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Larsson, Rikard
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Identifiering av variabler vid framtagning av optimerad stickprovsfrekvens2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Arbetet kring mätfrekvenser, alltså hur ofta en producerad detalj ska mätas, inom produktionen på Volvo Cars följer i dagsläget inget standardiserat arbetssätt. Arbetet kring det bygger i stort på tidigare erfarenheter och vad liknande utrustningar har för mätfrekvens. Volvo Cars efterfrågar mer kunskap inom området för att få en mer kostnadseffektiv kvalitetssäkring.

    Arbetets huvudsyfte har innefattats av identifiering gällande vilka variabler som påverkar mätfrekvensen, samt uppbyggnad av en enklare modell där variablerna applicerats. Intervjuer har även genomförts på ett flertal företag, där några av de viktigaste slutsatserna är:

    • Mätfrekvenser arbetas med retroaktivt, snarare än proaktivt.

    • Duglighet är i dagsläget vanligast att använda vid arbete med mätfrekvenser.

    • Arbete med mätfrekvenser sker inte standardiserat.

    • Förbättring av mätfrekvenser jobbas med i låg grad och när det väl görs är det ofta triggat av en mantidsanalys.

    Arbetet har resulterat i identifiering av två huvudvariabler; duglighet och kvalitetskostnader. Även om verkligheten är mer komplicerad, kan dessa två variabler ses som huvudkategorier. Under duglighet och kvalitetskostnader finns sedan underkategorier.

    För duglighet finns verktygsrelaterade egenskaper såsom förslitning och dess material. Även detaljens material och dess termodynamiska egenskaper har inverkan på dugligheten. Slutligen återfinns felintensitet, vibrationer som uppstår och processens stabilitet.

    Gällande kvalitetsbristkostnader finns felkostnader som uppstår inom företagets väggar, interna felkostnader, och de felkostnader som uppstår när produkt levererats till kund, externa felkostnader. Utöver de två finns även kontrollkostnader och förebyggande kostnader.

    Arbetet har dessutom mynnat ut i en enklare modell där erfarenhet från intervjuer och data från Volvo Cars tagits i beaktande. Flera av de data som återfinns i modellen har tagits fram genom analysering av tre veckors produktionsdata från Volvo Cars. Data som används i modellen berörande kvalitet är duglighet och den procentuella fördelningen av den aktuella varianten. De data som har inverkan på kvalitetskostnaderna är hur många operationer flödet har och aktuell operations placering i relation till totala antalet. Även råämnets kostnad, allvarlighetsgraden för kvalitetsbristen hos aktuell egenskap och skrotkostnaden används.

    Modellen har sedan applicerat på en maskinerna som omfattats av arbetet för att kontrollera utfallet. Med data införd baserad på produktionsdata från Volvo Cars har en stickprovsfrekvens på 62 genererats.

  • 178.
    Gustafsson, Rasmus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Time study and flow-simulation: Current and future analysis2019Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    Discrete-event simulations are increasingly being used to solve problems and to aid in decision making which are proving useful in the manufacturing industry. The main aim for this thesis was to compare the current production line and how implementing changes for a future state as a supporting basis for making the decision.

    The theoretical framework focused on the Lean philosophy merged with simulation-based methods. The simulation model was build using the collected data. A time study was conducted in order to verify the process and setup times since these were only estimated at the time. Two simulation models were built for the current production line and the future state. The future state was based on the current one since no changes in the process and setup times would be made during the two simulation-model. Experiments were then done to compare the different states, one with batch and the other single-piece flow. The parameters were set on equal terms and the compared values were throughput (TH), lead-time (LT) and work in process (WIP). The conclusion drawn from the results is that the future state would be more efficient.

  • 179.
    Gutierrez Hernandez, Lucero
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Ramirez Garcia, Wenny Fernanda
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Sustainable System for Water Desalination2018Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    Ankarstiftelsen, a non-profit organization with the mission of assuring the access to basic necessities in developing countries, presented a brief for a sustainable water desalination system, to obtain acceptable drinking water, in the region of La Guajira, Colombia.  The main objective of the project is the creation of an initial proposal for a sustainable desalination system using solar energy with a minimal cost of construction. 

     

    This project required large amounts of research regarding the principles of desalination and water purification systems. As well as the living conditions, weather, and water situation in La Guajira. Empirical studies helped verify initial information and provided a better understanding of desalination systems and their principles. Methodologies such as user personas, interviews, and Function analysis were used to determine key constraints and aspects to be considered in the project development.  In addition, simple functionality tests were conducted to evaluate the concepts generated. The resulting design proposal is a collection of technical functionality aspects and user identity that aims to create a meaningful and coherent product to be implemented in its designated context.

  • 180.
    Gutiérrez Rodríguez, Julia
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Morales Salto-Weis, María
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Design of a cozy and ergonomic workplace2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    The aim of this project is to develop an armchair for work, in collaboration with the furniture company Jooy. A background study was first performed to define the mission statement and to set the requirements. The background study includes a market research to know who the customers and the potential clients can be, a study of the Scandinavian design style and gathering data from customers to define the users’ needs. After the background study, potential users were delivered a questionnaire to clarify the objectives. The next step has been to set the specifications. At this point, the idea generation stage was carried out using creative and rational design methods, such as the Morphological Chart, until the final concept was chosen. Using the specifications and creative methods such as Brain drawing, different possible solutions were generated. When the product was defined, a study in materials and ergonomics was performed. In addition, a prototype was built to test by users at University of Skövde. Finally, 3D CAD model was implemented in PTC Creo Parametric. The design process followed is inspired by the front-end concept development process.   During the development of the project the collaboration with the company has been crucial in order to learn about materials, ergonomics and how to make a prototype. Also feedback from the supervisor and the company has been continuously considered to improve the project.

  • 181.
    Hanson, Lars
    et al.
    Lund University.
    Högberg, Dan
    Högskolan i Skövde, Forskningscentrum för Virtuella system. Högskolan i Skövde, Institutionen för teknik och samhälle.
    Use of Anthropometric Measures and Digital Human Modelling Tools for Product and Workplace Design2012Inngår i: Handbook of Anthropometry: Physical Measures of Human Form in Health and Disease / [ed] Victor R. Preedy, Springer Science+Business Media B.V., 2012, s. 3015-3034Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    This chapter addresses and demonstrates the application of digital human modelling (DHM) tools to consider anthropometric diversity in product and workplace design. A number of additional methods for evaluating ergonomics conditions are also illustrated. Three cases show how DHM tools can be applied in different design settings and for different design undertakings, focusing on user variation in anthropometry. A number of methods for user representation in the DHM tool are briefl y presented. Method selection depends on the design problem at hand, and the chapter exemplifies the use of different methods for different design tasks. Examples are the use of onedimensional percentile based statistics data, the use of predefined collections of manikins, and the creation of representative cases by using multidimensional statistics. The chapter takes a designer’s view of the uses of DHM tools for anthropometry-related issues and illustrates how the tools can be of value in the design process.

  • 182.
    Hanson, Lars
    et al.
    Scania CV / Chalmers.
    Högberg, Dan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Carlson, Johan S
    Fraunhofer Chalmers Centre.
    Bohlin, Robert
    Fraunhofer Chalmers Centre.
    Brolin, Erik
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. Chalmers.
    Delfs, Niclas
    Fraunhofer Chalmers Centre.
    Mårdberg, Peter
    Fraunhofer Chalmers Centre.
    Stefan, Gustafsson
    Fraunhofer Chalmers Centre.
    Keyvani, Ali
    Högskolan Väst / Chalmers.
    Rhen, Ida-Märta
    Fraunhofer Chalmers Centre / Chalmers.
    IMMA – Intelligently moving manikins in automotive applications2014Konferansepaper (Annet vitenskapelig)
  • 183.
    Hanson, Lars
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Högberg, Dan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Carlson, Johan S.
    Geometry and Motion Planning group, Fraunhofer-Chalmers Center, Göteborg, Sweden.
    Delfs, Niclas
    Geometry and Motion Planning group, Fraunhofer-Chalmers Center, Göteborg, Sweden.
    Brolin, Erik
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Mårdberg, Peter
    Geometry and Motion Planning group, Fraunhofer-Chalmers Center, Göteborg, Sweden.
    Spensieri, Domenico
    Geometry and Motion Planning group, Fraunhofer-Chalmers Center, Göteborg, Sweden.
    Björkenstam, Staffan
    Geometry and Motion Planning group, Fraunhofer-Chalmers Center, Göteborg, Sweden.
    Nyström, Johan
    Geometry and Motion Planning group, Fraunhofer-Chalmers Center, Göteborg, Sweden.
    Ore, Fredrik
    School of Innovation, Design and Engineering, Mälardalen University, Eskilstuna, Sweden.
    Industrial path solutions - intelligently moving manikins2019Inngår i: DHM and Posturography / [ed] Sofia Scataglini, Gunther Paul, London: Academic Press, 2019, s. 115-124Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    IPS IMMA (Industrial Path Solutions - Intelligently Moving Manikins) is a digital human modeling tool developed in close cooperation between academia and industry in Sweden. The academic consortium behind the software consists of expertise within applied mathematics, ergonomics, and engineering. The development of IMMA was initiated from the vehicle industries’ need of an effective, efficient, objective, and user-friendly software for verification of manufacturing ergonomics. The ‘Industrial path solutions - intelligently moving manikins’ chapter consists of two main sections: the first about the commercially available tool, and the second about current or recent research projects developing the software further. Commercial IPS IMMA is presented by describing the biomechanical model and appearance, anthropometrics module, motion prediction, instruction language, and ergonomics evaluation. The research projects focus on dynamic motions simulation, muscle modelling and application areas such as human-robot collaboration, occupant packaging, and layout planning.

  • 184.
    Hartelius, Belinda
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Fransson, Philip
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Vibrationsanalys av vevaxel vid fräsoperation2017Independent thesis Basic level (university diploma), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Finita elementmetoden (FEM) utvärderas för att i framtiden kunna undvika mycket av den fysiska provning som idag används vid optimering av maskininställningar, både vid införandet av nya maskiner men även på befintliga. Fräsmaskinen som granskas grovbearbetar fyrcylindriga vevaxlar under åtta bearbetningstempon. Resonansfrekvenser skulle kunna identifieras med hjälp av en FEM-modell och sedan undvikas genom att justera skärhastigheten.

    Litteraturstudien innefattar skärande bearbetning, vibrationer, svängningsteori och FEM. Modeller av vevaxlar ges av arbetsgivaren och egenfrekvensanalyser utförs i programvaran Abaqus för samtliga bearbetningstempon. Egenfrekvenser jämförs med den drivande frekvensen från fräsverktyget.

    Fräsning i vevaxelns egenfrekvens inträffar vid ett tillfälle, bearbetningstempo två. Vibrationerna antas inte påverkas i stor utsträckning på grund av fräsverktygets differentialdelade skär som gör att fräsning i egenfrekvens endast inträffar var sjätte skär. Vibrationsdata från arbetsgivaren visar även att vibrationerna är låga för bearbetningstempot. FEM-modellerna verifieras med fysiska experiment (slagimpulsprov) på fritt upphängd vevaxel och jämförs med resultat från FEM-analys för fri axel. Skillnaden i egenfrekvens mellan experiment och FEM-simulering är maximalt 5 %, vilket bekräftar modellernas tillförlitlighet. Vidare skapas en förenklad modell av fräsverktyget som analyseras angående egenfrekvenser i Abaqus. Egenfrekvenserna visar sig vara betydligt högre än högsta skärfrekvensen, vilket verifierar att bearbetning inte sker i verktygets egenfrekvens.

    Finita elementmetoden är en mycket lämplig metod för att fastställa egenfrekvenser och därmed undvika bearbetningsvibrationer som uppstår p.g.a. resonans. Fräsverktygens differentialdelade skär ger dock en ständigt varierande frekvens, vilket tyder på att vibrationerna i fräsmaskinen troligtvis inte orsakas av resonansfenomenet.

  • 185.
    Hedberg, Patrik
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Shibli, Haidar
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Jämförelse av två konstruktionslösningar för en hjulaxel till en åkattraktion2018Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Detta arbete genomförs på uppdrag av Skara Sommarland. Arbetet är till stor del baserat på att utföra en jämförande studie mellan två hjulaxlar till en åkattraktion. Den befintliga axeln består av tre delar, två axelpar och ett centerfäste, medan den nya designen av axeln enbart består av en del. Den befintliga axelns ändar som kopplas in i centerinfästningen utsätts för onödigt slitage. Arbetet belyser även orsaken som leder till nötningen samt möjligheter att minska nötningen. Den nydesignade axelns högre pris medför höga kostnader för företaget.I arbetet används Haigh-diagram för att undersöka om arbetspunkten för den nya axeln ligger under Haigh-diagram kurvan, som teoretiskt sett leder till oändlig livslängd. I arbetet utförs en FEM analys för att simulera båda axelkonstruktionerna och för att beräkna spänningarna i axeln under belastning.Resultatet av genomförda analyser visar att den befintliga axeln plasticerar medan den nya axeln inte når sträckgränsen för materialet. Varken den befintliga eller den nya axeln når brottgränsen. Eftersom brottgränsen inte nås finns ingen risk för sprickbildning enligt finite fracture mechanics. För den befintliga axeln visar resultatet att det uppstår en rörelse mellan axel och infäste som är tillräckligt stor för att klassificeras som en orsak för nötning.För att undvika eller minimera nötningen kan möjliga åtgärder genomföras vilka beskrivs i arbetet. Exempel på förbättringsförslag som skyddar mot korrosion och nötning ges som till exempel rengöring före ytbehandling och ökad korrosionshärdighet.

  • 186.
    Hellberg, Patrik
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Lindberg, Henrik
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Ställtidsförbättring på Cejn AB: SMED arbete i maskiner som bearbetar rostfritt material2015Independent thesis Basic level (university diploma), 15 poäng / 22,5 hpOppgave
    Abstract [sv]

    Företaget Cejn AB har idag svårt att konkurrera prismässigt på marknaden när det gäller vissa rostfria detaljer. Ett led i att minska kostnaderna för att producera artiklarna är önskemålet från företagets sida att se efter om det går att genomföra en ställtidsreducering på maskincellen, se bilaga 5, som tillverkar rostfritt. Företaget har även önskemål om att en checklista ska tas fram för hur ställarbetet ska gå till i cellen, för om möjligt standardisera arbetet. Skiftgången i cellen är idag tvåskift och maskinerna är bemannade med en operatör per maskin och skift. Nulägesanalysen, som gjordes i början av projektet, visar att den genomsnittliga ställtiden idag är på ca 18 % av planerad produktionstid.

    Önskad arbetsmetod från företagets sida var SMED (Singel Minute Exchange of Die), metoden myntades av Shiego Shingo som kom fram till att ett ställ, tiden det tar att byta produktion i en maskin av en produkt till en annan, bör kunna ske på under tio minuter. Metoden bygger på att förvandla inre ställ, arbete som pågår när maskinen står still, till yttre ställ, arbete som pågår när maskinen går. Endast de moment som måste göras när maskinen står still ska vara med i det inre stället. För att mäta den effekt SMED-arbetet medför och för att se hur lång tid som varje moment tar användes en tidsstudie. Valet föll på att använda en kontinuerlig klocka under tidtagningen. Tidsstudiedokumentet som användes för att notera tiderna i var framtaget med ursprung i de inledande observationerna. Då Cejn AB har Lean som produktionsfilosofi har ett antal verktyg inom området använts under arbetet. Övergripande arbetsmetod för arbetet har varit PDCA (Plan, Do, Check, Act), där varje mindre moment i arbetet har delats ned i mindre PDCA-cykler.

    Utifrån den inledande tidsstudien beräknades ett teoretiskt resultat fram, det visar på att bara genom att förändra den ordning som operatören utför arbetsmomenten i går det att minska ställtiden med ca 20 %. För att verifiera det resultatet och för att testa den checklista som var framtagen gjordes en pilotstudie. Den visar på att förändringen är ca 11 %, vilket beror på att de ställ som observerades var krångligare och svårare än de som den inledande studien mätte. Ovanan med att arbeta utefter det nya arbetssättet för operatörerna är även det en bidragande orsak till att det är en diskrepans mellan teoretiskt och verkligt utfall. Under pilotstudien testades även den ställåda som var framtagen i projektet, vilket mottogs bra av operatörerna. Resultatet från pilotstudien visar att ställådan har effekt på momentet med att montera verktyg. Effekten är att tiden minskar med ca 8 % av att den inre ställtiden på det momentet.

    De av Cejn AB satta målen har uppnåtts då ställtidsreducering kan påvisas och checklistor har tagits fram. Det nya arbetssättet kan standardiseras av företaget.

  • 187.
    Helsing, Niklas
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Nilsson, Simon
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    3D-skrivare ur ett tillverkningsperspektiv2015Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [sv]

    I detta examensarbete har en studie genomförts av hur väl 3D-skrivning kan tillämpas i Volvo Cars i Skövdes produktion. En litteraturstudie har genomförts för att åskådliggöra de olika 3D-skrivningsteknikerna och deras användningsområde. För att på ett överskådligt sätt jämföra de olika teknikernas duglighet har en bedömningsskala utvecklad av Nasa använts. Denna skala benämns som Technology Readiness Level (TRL). Den teknik som bedöms som mest lämplig med avseende på fullskalig produktion samt prototyptillverkning är Selective laser melting (SLM).

    För att åskådliggöra fördelar med 3D-skrivare har en förenklad 3D-modell av Volvos cylinderblock I5D modellerats. Denna förenklade modell har sedan modifierats för att åstadkomma en temperatursänkning som kan möjliggöra ett högre effektuttag. Två varianter av topologiska modifieringar presenteras. För dessa modifieringar har sedan värmelaster och kylning applicerats för att analysera värmespridningen i cylinderblocket. Jämförande mellan originaldesignen och de topologiska modifieringarna har sedan utförts. Målet med detta var att sänka den kritiska temperaturen i cylinderväggarna med åtminstone . Beräkningar har utförts med PTC/Creo.

    Med hjälp av TRL-skalan bedöms Selective laser melting vara den teknik som är mest lämplig för Volvo Cars i Skövde att tillämpa med avseende på prototyptillverkning. Med avseende på fullskalig produktion anses ingen av de teknikern som benämns i arbetet vara lämpliga.

    Resultatet visar att genom topologiska modifieringar kan temperaturen i det kritiska området sänkas med upp till 51 . En enkel kostnadsberäkning har utförts för att uppskatta hur mycket ett cylinderblock skulle kosta om den traditionella tillverkningen ersattes med 3D-skrivare. Detta visar att ett cylinderblock av typen I5D skulle kosta cirka 10 853 kr att tillverka med 3D-skrivaren X line 1000 R. I det priset är inte inköp av 3D-skrivaren inräknat. Rapporten diskuteras också följderna av resultatet. Vilka de potentiella felkällorna kan vara och vad som kan ha gjorts annorlunda. Det diskuteras också hur framtiden ser ut för 3D-skrivning och vad som skulle kunna göras som en naturlig fortsättning på detta examensarbete.

  • 188.
    Henriksson, Eva
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Johansson, Sofie
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Utveckling av ett höj- och sänkbart elevbord2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    I kursen Examensarbete i Integrerad produktutveckling på Högskolan i Skövde har under våren 2017 ett produktutvecklingsprojekt för Kinnarps utförts av designingenjörsstudenterna Eva Henriksson och Sofie Johansson. Kinnarps är ett företag som tillverkar möbler för offentliga miljöer och vill nu i samband med deras nya satsning, att utveckla utformningen av hur lärmiljöer ser ut, ta fram ett höj- och sänkbart elevbord anpassat för årskurs 4-9.

    Under projektet användes och utvärderades också QFD – Quality Function Deployment som ett verktyg för att identifiera och uppfylla rätt kundbehov. Förstudien och användandet av QFD innebar bland annat att genomföra intervjuer och observationer av användare och målgruppen, identifiera trender i lärmiljöer, utföra konkurrentanalyser, utvärdera och vikta kundbehov samt att översätta behoven till kvalitéer som gick att uppfylla.Förstudien visade på att bordets viktigaste kvaliteter att uppfylla var att det skulle vara flexibelt, mobilt, tyst och enkelt att justera.Konceptutvecklingen inleddes med att identifiera och utvärdera olika höj- och sänkmekanismer. Därefter påbörjades konceptgenerering som utfördes med hjälp av olika kreativitetsmetoder. Koncepten utvärderades och sållades kontinuerligt under processen efter hur väl de uppfyllde kundbehoven samt genom användartester och återkoppling med målgruppen.

    Inför konceptvalet återstod till sist två koncept. Beslutet av det slutliga konceptet grundades i hur väl det uppfyllde de identifierade kundbehoven.Resultatet blev ett bord som uppfyller de ställda kraven och passar väl in i de lärmiljöer som finns idag men är också anpassat för hur lärmiljöer troligtvis kommer se ut i framtiden. Bordet har den funktionalitet som efterfrågades av användarna samtidigt som det har en utformning som är unik och tilltalande.

  • 189.
    Hermansson, Jakob
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Wahlström, Emma
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Materialval för minskat slitage av sandformningsverktyg2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    På Volvo Group Trucks Operations (GTO) i Skövde tillverkas cylinderblock, cylinderhuvud och svänghjul genom gjutning med sandformar. Då formverktygen som formar sandformarna fylls uppkommer slitage där sandpartiklarna träffar, vilket leder till att formverktygen behöver underhållas regelbundet.Målet med denna studie är att hitta alternativa material som formverktygen kan tillverkas i alternativt förstärkas eller beläggas med för att minska slitaget i formverktygen och på så sätt minska kostnader genom att förlänga underhållsintervallen. Problemet analyseras och en litteraturstudie kring erosiv och abrasiv nötning genomförs.Ett antal material tas fram genom en materialvalsprocess som lämpliga kandidater baserat på litteraturstudien, materialkartor och diskussion. Materialprover testas med en standardmetod för erosion med gasburna partiklar. Resultat från tidigare empiriska studier tyder på att erosion påverkas starkt av materialegenskaper så som hårdhet och seghet men även de eroderande partiklarnas infallsvinkel och hastighet.Erosionstestet utförs för 30 och 90 graders infallsvinkel. Testet visar att de mjukare stålen, Holdax och Sverker 21, har högre beständighet mot erosion vid låga infallsvinklar och det hårdare stålet Nimax har högre beständighet vid höga infallsvinklar. Nimax anses vara ett lämpligt material till formverktyget då Nimax har den totalt lägsta erosionstakten vid hopslagning av den totala erosionstakten över båda infallsvinklarna. Nimax har den lägsta erosionstakten vid 30 graders infallsvinkel och anses även ha god beständighet mot erosion vid 90 graders infallsvinkel.Rekommendation ges kring upprepade erosionstester för att säkerställa resultatet. Rekommendationer finns också kring materialprovning i formverktyget för att se om ett materialbyte skulle leda till besparingar. Undersökning av möjligheter att konstruera bort nötning i formverktyget genom ändring av infallsvinklar mellan den inblåsta sanden och formverktyget, samt ändring av lufttryck rekommenderas.

  • 190.
    Hilletofth, Per
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Differentiated Supply Chain Strategy - Building Knowledge through Case Studies2008Inngår i: Fourth International Railway Logistics Seminar: Co-operation among Transportation Modes in Northern Europe, Lappeenranta University of Technology , 2008, s. 5-28Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Nowadays companies usually offer a wide range of products and services in various types of non-coherent business environments. It is becoming apparent that traditional ‘one-size-fits-all’ supply chain strategies does not support a wide range of products sold in a diversity of markets. Consequently, it becomes increasingly necessary to employ different manufacturing and delivery strategies concurrently in order to develop a differentiated supply chain strategy. This paper employs a descriptive multiple case study approach to illustrate how two companies has develop a differentiated supply chain strategy. Case study findings reveal that one efficient method to develop a differentiated supply chain strategy is to combine different manufacturing and delivery strategies into various supply chain solutions. By combining relatively few strategies it is possible to develop several differentiated supply chain solutions.

  • 191.
    Hilletofth, Per
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Differentiated Supply Chain Strategy - Response to a fragmented and complex market2008Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Supply Chain Management (SCM) aims to synchronize the requirements of customers with the flow of materials from suppliers, in order to satisfy the needs of the customers as costefficiently as possible. This has become a difficult task due to several developments in the market, such as increased competition, increased demand variability, increased product variety, increased amounts of customer-specific products, and shortening product life cycles. These developments, due in part to globalization, provide additional management challenges and new practices in which supply chains are designed and managed, and can eventually make the difference between companies staying competitive or not. The overall purpose of this thesis is to investigate how complexity and globalization affect supply chain design and operations. The main emphasis has been on producing descriptive results of the studied phenomenon. This research involves five case studies covering international transportation structures used in SCM, the selection of supply chain strategies in different business environments, and the role of information systems and technology in achieving the objective of SCM. In this thesis it has been concluded that in order to cope with increasingly complex and fragmented markets companies need more differentiated transportation structures, modes, and supply chains. Furthermore, to effectively manage this, information systems and advanced decision support tools are required. In addition, this thesis has shown that current taxonomies for supply chain strategy selection are too simplistic due to three major problems: they mediate that it is a question of choosing one supply chain strategy for the entire company,

    they regard markets as rather homogeneous, and they link each supply chain strategy to a specific business context. Instead, it has been concluded that in order to better satisfy differing customer needs in various markets it is increasingly necessary to develop a differentiated supply chain strategy by utilizing different manufacturing and delivery strategies concurrently. Thus, a need exists for new taxonomies for supply chain strategy selection which recognize that the markets are becoming more fragmented and complex, that customer preferences differ across customer/market segments, and that there is a need to differentiate the supply chain strategy. This thesis also highlights several requirements of a differentiated supply chain strategy. Firstly, extended supply chain collaboration is required, since a differentiated supply chain strategy will involve more supply chain partners than a traditional supply chain strategy. Secondly, there is a need for more transportation mode alternatives, particularly intermodal, both in supply and distribution operations, due to the fact that differentiation requires diversity. In this thesis, intermodal landbridge freight services are highlighted as one interesting avenue, which could potentially facilitate a more differentiated supply chain strategy. Thirdly, more integrated information systems are needed along with decision support tools. This study illustrates that agent based modeling appears to be an interesting method for developing realistic decision support tools in the context of complex supply chains. An interesting aspect for further research is to investigate how different manufacturing and delivery strategies can be used concurrently in international supply chains. Moreover, there are several requirements and opportunities of a differentiated supply chain strategy, and these have to be investigated further

  • 192.
    Hilletofth, Per
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Enterprise Resource Planning Systems in Higher Education2008Inngår i: Fourth International Railway Logistics Seminar: Co-operation among Transportation Modes in Northern Europe / [ed] Olli-Pekka Hilmola, Lappeenranta University of Technology , 2008, s. 167-180Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Information systems and technology are becoming more and more important in the industry. Consequently, it is important to include these in any modern logistics education. This paper describes how ERP-systems are utilized in logistics education programs and courses at University of Skövde (Sweden). The objective of this paper is to highlight the importance of information systems and technology in a modern logistics education.

  • 193.
    Hilletofth, Per
    et al.
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Lorentz, Harri
    Logistics, Turku School of Economics, Turku, Finland.
    Savolainen, Ville-Veikko
    Lappeenranta University of Technology, Kouvola Research Unit, Kouvola, Finland.
    Hilmola, Olli-Pekka
    Lappeenranta University of Technology, Kouvola Research Unit, Kouvola, Finland.
    Ivanova, Oksana
    Lappeenranta University of Technology, Section of Logistics, Lappeenranta, Finland.
    Using Eurasian Landbridge in Logistics Operations: Building Knowledge through Case Studies2007Inngår i: World Review of Intermodal Transportation Research (WRITR), ISSN 1749-4729, E-ISSN 1749-4737, Vol. 1, nr 2, s. 183-201Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This research concerns about the use of Eurasia as a landbridge for container traffic. We present case study findings concerning European-Asian transportation, and this reveals that the lead time advantage of landbridges (with respect of its costs) would be suitable for a manufacturer, but malfunctioning parts of harbours and railway transports hinder the potential of this alternative. Findings from demanding manufacturing logistics are further verified with a case study concerning a Finnish retailer having increasingly important presence in Russian markets. Retailer used to favour railways (~early part of Eurasian corridor) but has nowadays configured distribution operations to favour road transports.

  • 194.
    Hjelm, Susanna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Utveckling av en användarcentrerad designprocess för utformning av ergonomiska arbetsplatser enligt Lean2014Independent thesis Basic level (degree of Bachelor), 180 hpOppgave
    Abstract [sv]

    Uppdraget för detta examensarbete består i att utveckla en användarcentrerad designprocess för utformning av ergonomiska arbetsplatser som följer riktlinjer för Lean. Syftet är att studera hur filosofier och styrningsverktyg för Lean produktion, lagkrav i Arbetsmiljölagen och övriga föreskrifter samt ergonomiriktlinjer på ett framgångsrikt sätt kan integreras i produktutvecklingsprocesser. Utgångspunkten för detta arbete är att genomföra en kvalitativ analys av VPS assessment som är en prototyp av en utvärderingsmodell för Volvo Production System (VPS), utvecklad av sakkunniga inom ergonomiområdet på AB Volvo. Målsättningen är att stödja designarbetet så att riktlinjer för Lean, lagkrav i Arbetsmiljölagen och ergonomisk måluppfyllnad ingår i de typiska faserna av en designprocess; förstudie, formulering av kravspecifikation, generering och utvärdering av lösningar samt detaljkonstruktion. Den kvalitativa analysen som genomfördes resulterade i en integrering av aspekter från VPS assessment in i en generell designprocess. Resultatet från analysen utgör en grund för vidareutveckling av en användarcentrerad designprocess. Slutsatser som dras från arbetet är att aspekterna från VPS assessment som integrerats i en generell designprocess kan bli ett stöd för produktutvecklaren i att utforma ergonomiska arbetsplatser som följer riktlinjer för Lean samt uppfyller lagstadgar och föreskrifter i Arbetsmiljölagen.

  • 195.
    Hjort af Ornäs, Viktor
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Users, emotions and meaningful things2007Licentiatavhandling, med artikler (Annet vitenskapelig)
  • 196.
    Hoang, Hue
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Widerström, Matilda
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Simulation of distributed windings using the insert technique2019Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    During the insert process when the windings of an electric motor are pushed into the stator slots, some detrimental phenomena can occur that affect the efficiency and life of the motor. To detect these phenomena and optimize the process, a simulation would be useful. An investigation of the possibility to perform a simulation, using an appropriate numerical method for the insert process of distributed windings in a permanent magnet synchronous motor, was performed. During the project, a literature study was carried out to investigate existing methods and key-parameters for the simulation of the process. Explicit finite element method has been shown to be a suitable numerical method for simulating another winding process. An explicit finite element analysis was performed with a simplified model of the stator, the wires, the transmission tool and the needles by using the software Abaqus/CAE. In order to reduce the computational time, beam elements were used to model the wires and the other parts as rigid bodies. The model accounted for example contact and provided numerical results. The result was a suitable model. However, it needs to be developed further.

  • 197.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Adaptive Decision Support for Shop-floor Operators using Function Blocks2017Doktoravhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    In manual and semi-automation production systems, flexibility and adaptability are affected by the shop-floor operators’ skills, abilities and knowledge. Such dependencies highlight the vital importance of developing and utilising the knowledge, achievements and abilities of the operators working with production on the shop-floor. Teamwork, including both novice and highly experienced shop-floor operators, in a production environment with a high level of automation, is essential already today and is predicted to increase, when the complexity and demands of future production systems intensify. This trend is confirmed in both the research literature and by specialists within industry.

    The key to future competitiveness and effectiveness of the manufacturing industry is the shop-floor operators who handle the production systems. In addition, the future information intensive working environment, with its increasing complexity and less time available for decision-making, demands adaptive decision support and adaptive control systems that facilitate collaborative work on the shop-floor. It is therefore important to emphasise how decisions are supported in the time-limited working environment of the shop-floor, because this has a large impact on production output and quality and is vital to the success of the company. Consequently, this dissertation presents a framework for an adaptive decision support system that concentrates on shop-floor operators, in order to enhance their development and future contribution to leading edge production systems.

    The overall aim of the research presented is to define a framework for an Adaptive Decision Support System, to address the scope and demands of the future shop-floor, as indicated in the research literature, and confirm its relevance, as well as further elaborate it on the basis of interviews with production managers and HR specialists

    The research presented uses the design science research process. In parallel, decision support systems and the industrial shop-floor have been studied in the research literature and the current state of industrial practice has been assessed. These areas together form the basis for the research on adaptive decision support for shop-floor operators. A framework enabling adaptive decision support and adaptive system control, based on event-driven function block technology and Augmented Reality technology, is formulated.

    The gap of research on decision support for shop-floor operators, indicated in the research literature is addressed by the research preformed.  Adaptive and dynamic decision support and system control able to process vast amounts of information in real time demonstrates utility for shop-floor operators. The research presenting the Adaptive Decision Support System has demonstrated its utility for shop-floor systems and production operatives in two extensive studies using demonstrators based on real-life production environments.

    A methodology, the ‘User group’, has been formulated for research collaboration and bi-directional knowledge transfer between academia and the industrial partners. It provides tools that enable cooperation between the experienced research partner and the novices, despite their different levels of engagement in the same project, without dividing them into separate groups. The ‘user group’ case study presented describes how both the inexperienced and the research mature companies gain new knowledge and engage in ongoing research. By doing so, the industrial project partners have extensively supported the research presented and will subsequently be the expected beneficiaries.

  • 198.
    Holm, Magnus
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    The future shop-floor operators, demands, requirements and interpretations2018Inngår i: Journal of manufacturing systems, ISSN 0278-6125, E-ISSN 1878-6642, Vol. 47, s. 35-42Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The evolution of the manufacturing industry reveals continuous progress and development throughout the years. This evolution not only includes production methodologies and the production equipment, it also includes the working environment of the shop-floor operators. The demands faced by the shop-floor operators have developed from strictly controlled, simple and monotonic tasks to self-controlled team work requiring a holistic approach that aims at continuous improvements and achieving a high degree of flexibility, adaptability and initiative.

    This paper describes the evolution of the shop-floor operator, according to the research literature and interviews with manufacturing managers and human resources specialists. In addition, the paper presents the response of future Swedish shop-floor operators, today’s high-school students, to a description of their possible future work as shop-floor operators. The Swedish manufacturing industry competes, to a large extent, on and responds to the international market. The findings made in this paper are thus also interesting for other industries and countries acting on the international market.

  • 199.
    Holm, Magnus
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Adamson, Göran
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Moore, Philip
    Academy of Innovation & Research, Falmouth University, Cornwall, United kingdom.
    Wang, Lihui
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system. KTH Royal Institute of Technology, Stockholm, Sweden.
    Why I want to be a future Swedish shop-floor operator2016Inngår i: Research and Innovation in Manufacturing: Key Enabling Technologies for the Factories of the Future - Proceedings of the 48th CIRP Conference on Manufacturing Systems / [ed] Roberto Teti, Elsevier, 2016, Vol. 41, s. 1101-1106Konferansepaper (Fagfellevurdert)
    Abstract [en]

    When looking in rear view mirrors the Swedish as well as the international production industries can overview several years of progress covering all aspects of production. Production methodologies and machines etc. have changed and evolved, and so has the environment of the shop-floor operator. The demands on the shop-floor operators have grown from simple monotonic tasks with low complexity to pro-active team work requiring flexibility, continuous improvements and a holistic approach. With a base in a study where production and HR-managers at six Swedish manufacturing industries have been interviewed this paper identifies the role of today’s and the future Swedish shop-floor operator. The response to the described role of the future operator is compiled from the ones who will become the future Swedish shop-floor operators – today’s teenagers attending technical high-school. Their views of the environment of the future shop-floor operator are described by accuracy, development, a good working environment and team work. The paper also reveals what the offer should include to make these teenagers say: I want to be a future Swedish shop-floor operator.

  • 200.
    Holm, Magnus
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Adamson, Göran
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Wang, Lihui
    KTH Royal Institute of Technology, Stockholm, Sweden.
    Moore, Philip
    Academy of Innovation & Research, Falmouth University, United Kingdom.
    Framework for an adaptive decision support system for industrial shop-floor operators2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Today’s shop-floor operators’ working tasks often stretches over a broad spectra of jobs; from ordinary production assignments to handling errors and performing maintenance. Demands for enhanced skills and knowledge are constantly raised to limit the consequences of tool breakage, machine down time and other stochastic events negatively affecting the production.

    To be able to meet these increasing demands a framework for a distributed and adaptive decision support system is proposed. It will help the shop-floor operator to distinguish between decision options and minimize time to consider appropriate actions to maximize productivity both during normal production and when facing unexpected or unscheduled events.

    In what ways is it possible to support operators in making decisions for optimal productivity?” was the opening question from the industry partner when beginning this research. Targeting this question a novel framework for an adaptive decision support system (DSS) enabled by event-driven function blocks, based on decision logics is proposed. Its ability to adapt to the actual conditions on the shop-floor is compared to a currently used voice message system in a test case.

1234567 151 - 200 of 474
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf