liu.seSearch for publications in DiVA
Change search
Refine search result
1234567 1 - 50 of 1190
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Ahlman, Per-Arne
    Linköping University, Department of Mechanical Engineering, Machine Design.
    Smörjning Av Lager2009Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The work thesis was performed at Assalub a company which is situated in Åtvidaberg. The company works with developing, manufacturing and marketing equipment for handling of lubricants for light and heavier industry. The work thesis it is based on a inquiry Assalub got from MacGregor which is a company within cargo solution, from port to offshore system.

    For unloading grain and other material from the ship cargo it is used combined inlet feeder and screw conveyor, there the inlet feeder is drilling down through the cargo and feed the screw conveyer with material to further destination. At the bottom of the screw conveyer and the inlet feeder there is a bearing that keep the parts together. However the lubrication of the bearing must be made manually. Until now the bearing was lubricated manually through a grease nipple from the bottom of the drill once a day.

     

    The purpose of the thesis was the construction of a lubricating system namely a pump with a grease container which should be placed inside the space of the screw conveyer, so the bearing will be continually lubricated and able to work several days without any stoppage.

    After receiving drawings and operating data for the screw conveyer, the details for the construction was designed in CAD system Solid Edge. The solid mechanics calculations on the weakest point on the construction was made by hand and afterwards the drawings for respectively details was made.

    The construction was completed, but because of the time limit for this work thesis, the manufacturing, mounting and testing were not included in these weeks. The grease containers capacity is approximately seventy-two hours, although desirable should be up to seven days. According to the solid mechanics calculations, the construction should have no problem to resist the stresses it would be exposed to.

    Since this is a prototype there is probably some adjustments and improvements to do, but the estimating is that the system should work properly as it is now.

  • 2.
    Albertini, G
    et al.
    Departimento di Fisica e Ingegneria dei Materiali e del Territorio Unverisita Ancona, Italy.
    Giuliani, A
    INFM Universita Ancona, Italy.
    Peng, Ru
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Manescu, A
    National Rd Institute for Welding amd material testing Universita, Ancona, Italy.
    Ponzetti, A
    NUOVA Jesi.
    Determination of the residual stress in a centrifuge bowl by neutron diffraction2002In: Applied physics.. A,. Materials science & processing, ISSN 0947-8396, Vol. 75Article in journal (Refereed)
  • 3.
    Albertini, G
    et al.
    Dip di Fisica e Ingegneria dei Materiali e del Territorio Universita Ancona Italy.
    Giuliani, A
    INFN Ancona, Italy.
    Peng, Ru
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Manescu, A
    Intituto di Scienze Fisiche Universita, Ancona, Italy.
    Rustichelli, F
    INFN Ancona, Italy.
    Pozetti, A
    NUOVA MAIP Jesi.
    Neutron diffraction determinatin of rediual stresses in a duplex steel centifuge bowl2002In: Metal 2002,2002, 2002Conference paper (Refereed)
  • 4.
    Alm, Håkan
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering.
    Nilsson, L.
    The use of car phones and changes in driver behaviour2001In: International Journal of Vehicle Design, ISSN 0143-3369, E-ISSN 1741-5314, Vol. 26, no 1 SPEC. ISSArticle in journal (Refereed)
    Abstract [en]

    The effects of mobile telephone use on traffic safety is discussed in the article. A number of empirical studies are reviewed and it is concluded that the use of a mobile telephone concurrently with car driving may have a negative impact upon traffic safety. The sub-tasks of entering a telephone number and having a demanding conversation are especially likely to increase the risk of an accident. To minimize the negative impact from telephoning on traffic safety a number of recommendations are suggested.

  • 5.
    Alm, Torbjörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Lif, Patrick
    Swedish Defence Research Agency.
    Evaluation of Artificial Cues in 3D Aircraft Displays2005In: International Conference on Human Computer Interaction, 2005,2005, Las Vegas, USA: MIRA Digital Publishing , 2005Conference paper (Refereed)
  • 6.
    Alm, Torbjörn
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Ohlsson, Kjell
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Kovordanyi, Rita
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, CSELAB - Cognitive Systems Engineering Laboratory.
    Glass Cockpit Simulators - Tools for IT-based Car Systems Design and Evaluation2005Conference paper (Refereed)
  • 7.
    Almer, J.
    et al.
    Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois.
    Lienert, U
    Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois.
    Peng, Ru
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Schlauer, Christian
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Odén, Magnus
    Engineering Materials Luleå University of Technology.
    Strain and texture analysis of coatings using high-energy x-rays2003In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 94, no 1, p. 697-702Article in journal (Refereed)
    Abstract [en]

    We investigate the internal strain and crystallographic orientation (texture) in physical-vapor deposited metal nitride coatings of TiN and CrN. A high-energy diffraction technique is presented that uses synchrotron x rays and an area detector, and which allows the strain and intensity distributions of multiple crystallographic planes to be measured by a single x-ray exposure. Unique texture states and nonlinear sin2 ψ strain distributions are observed for all coatings investigated. Quantitative analysis indicates that existing micromechanical models can reasonably predict strain and corresponding stress for mixed-hkl reflections but are inadequate for fully describing measured data. Alternative mechanisms involving deposition-induced defects are proposed.

  • 8.
    Almer, J
    et al.
    Linköping University, Department of Mechanical Engineering, Engineering Materials. Linköping University, The Institute of Technology.
    Odén, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Håkansson, G
    Bodycote Värmebehandling AB Linköping.
    Microstructure, stress and mechanical properties of arc-evaporated Cr-C-N coatings2001In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 385, no 1-2, p. 190-197Article in journal (Refereed)
    Abstract [en]

    The relationships between coating microstructure and properties in the Cr-C-N system have been investigated as a function of composition and post-deposition annealing. Coatings of varying compositions were grown using arc-evaporation, by varying the reactive gas flow ratio fR = f(C2H4)/f(N2) from 0 to 0.2, and were found to consist primarily of the cubic d-Cr(C,N) phase. Changes in both the unstressed lattice parameter, ao, and X-ray diffraction background intensity indicate that both the carbon concentration within the d-phase and amorphous/crystalline content increases with fR. Increasing fR also decreases the magnitude of the compressive biaxial residual stress, from approximately 6 to 1 GPa, while increasing both the inhomogeneous stress and thermal stability. The elastic modulus and hardness of as-deposited coatings were determined from nanoindentation to be 320 and 23 GPa, respectively, for moderate carbon concentrations (fR=0.05). Concurrent variations in microstructure and hardness with post-deposition annealing indicate that the as-deposited hardness is significantly enhanced by the microstructure, primarily by lattice defects and related stresses (microstresses) rather than average stresses (macrostresses).

  • 9.
    Almer, Jonathan
    et al.
    IKP, Konstruktionsmaterial Linköpings universitet.
    Odén, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Hultman, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
    Håkansson, Greger
    Tixon Brukens Sverige AB Linköping.
    Microstructural evolution during tempering of arc-evaporated Cr-N coatings2000In: Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films, ISSN 0734-2101, E-ISSN 1520-8559, Vol. 18, no 1, p. 121-130Article in journal (Refereed)
    Abstract [en]

    Cr-N coatings were arc-deposited at 50 and 300 V. The changes in the coating microstructure and phase content during tempering were monitored. As a result, the phase stability and activation energies for defect diffusion were determined as a function of ion energy.

  • 10.
    Almgren, Richard
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Ammenberg, Jonas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Hjelm, Olof
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Hantering av produkters miljöaspekter i miljöledningssystem2004Report (Other academic)
  • 11.
    Almgren, Richard
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Hjelm, Olof
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Axelsson, Ulrik
    IVL.
    Effektivare miljöledningssystem - en studie om brister, behov och möjligheter till förbättring.2003Report (Other academic)
  • 12.
    Almroth, Per
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Hasselqvist, Magnus
    Sjöström, Karl Henning Sören
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering.
    Simonsson, Kjell
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Modeling of the high temperature behaviour of IN792 in gas turbine hot parts2002In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 25, no 3, p. 305-315Article in journal (Other academic)
    Abstract [en]

    The material parameters for two isothermal viscoplastic models with deliberately limited sets of material parameters have been estimated. The models are to describe the behaviour of the nickel based superalloy IN792 in a gas turbine hot part application. The models are based on a power law flow equation and the state variable used is backstress. The model calibration is done by least-squares optimization using non-standard constitutive tests that are aimed at describing relevant component conditions. The constitutive tests give information about the kinematic hardening effects for the backstress evolution equations, while secondary creep data provides stress versus inelastic strain rate information for the flow equation. All tests are uniaxial and isothermal. With the estimated parameter sets the models give relatively good fits to the data. The results suggest that the models can be used to describe the high temperature behaviour of IN792. ⌐ 2002 Elsevier Science B.V. All rights reserved.

  • 13. Almér, J.
    et al.
    Odén, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Materials.
    Håkansson, G.
    Microstructure, Stress and Mechanical Properties in Arc-evaporated Cr-C-N Coatings2000In: Thin solid films : an international journal on the science and technology of thin and thick films, ISSN 0563-4652Article in journal (Refereed)
  • 14.
    Amadori, Kristian
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Lundén, Björn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Using CAD-Tools and Aerodynamic Codes in a Distributed Conceptual Design Framework2007In: Aerospace Sciences Meeting and Exhibit,2007, USA: AIAA , 2007Conference paper (Refereed)
    Abstract [en]

    Aircraft design is an inherently multi-disciplinary activity that requires different models and tools for various aspects of the design. At Linköping University a novel design framework is being developed to support the initial conceptual design phase of a new aircraft. Different modules are included, each one addressed to analyze and evaluate different aspects of the airplane, such as its aerodynamics, its weight and structure, its sub systems and its performances. All modules are easily accessible from a user-friendly interface based on an Excel spreadsheet. The link between all modules is based on Service Oriented Architecture (SOA) and allows both distribution and integration of all functions. This paper will present the framework, give an overview of its development status and give an indication on the future work.

  • 15.
    Ammenberg, Jonas
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Do standardised environmental management systems lead to reduced environmental impacts?2003Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The overall aim of this thesis is to increase the understanding of the relationship between standardised environmental management systems (EMSs) and the environment, focusing on the use of such systems by companies and on systems in accordance with the ISO 14001 and/or EMAS standards. Another purpose is to investigate how standardised EMSs fit small and medium-sized enterprises (SMEs) and to examine a special EMS solution called the Hackefors model, used by a group of SMEs, to find out how this model has affected the environmental efforts and business of these enterprises.

    To gather knowledge on the connection between EMSs and environmental impacts, two main roads have been followed. Firstly, empirical studies (and a few literature reviews) have been conducted, among other things, aiming to clarify how the standards' requirements are interpreted and applied in reality, and uncover what this means in terms of environmental impacts. For the most part, external environmental auditors and environmental managers have been interviewed. An important purpose is to illuminate what an ISO 14001 certificate, or an EMAS registration, guarantees. This means that the minimum level is emphasised to a large extent. Secondly, a literature review has been conducted to collect knowledge on the selected issue from the international research arena. One intention is that this review will contribute information about the average use of EMSs and thus serve as a good complement to the empirical studies.

    It has to be concluded that a standardised EMS does not guarantee a good environmental performance and defmitely not reduced environmental impacts. Without any doubt, EMSs can be used to structure and strengthen a company's environmental efforts, and many companies surely have achieved important reductions in terms of environmental impacts by using an EMS. However, the standards' formulations are very indistinct and they can be interpreted and applied in many different ways. It is clearly possible to be certified and registered without improving very much at all. The effects of EMSs are to a very large extent dependent on how companies choose to use them. To capture the potential that EMSs have, issues of credibility should be observed. Therefore, the thesis includes some recommendations in the form of discussion points.

    The Hackefors model clearly can be used to overcome many of the common barriers forimplementing an EMS at SMEs. In the studied case, the EMS implementation had led to severalimportant environmental improvements and also to other types of improvements.

    List of papers
    1. Environmental management systems: scope assessment of environmental aspects
    Open this publication in new window or tab >>Environmental management systems: scope assessment of environmental aspects
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    This paper aims to increase the understanding of how standardised environmental management systems (EMSs) affect environmental performance. Based on interviews with environmental managers from 18 different companies and two environmental consultants, we make clear how companies identify, formulate and assess their environmental aspects.

    The results show that consultants have an important role concerning EMSs. Many of the environmental managers have deficient knowledge concerning their own EMS, since they cannot explain central EMS procedures. This can probably be explained by too much external assistance, from consultants, in combination with internal barriers such as lack of competence, time and motivation.

    The characteristics of the companies’ assessment methods are presented, which among other things include which parameters are used and their relative weight. From an environmental point of view, it is positive that environmental parameters, in general, have a big influence. However it should also be noted that some of the companies use methods in which business parameters seem to dominate. Other important results show that most systems, overall, are facility oriented. In most cases it was difficult to understand the scope of individual aspects, for example, concerning what environmental impacts were considered. A majority of the environmental managers were rather uncertain about issues in relation to scope and system perspectives. Therefore, it is recommended that incentives be taken to increase environmental managers’ competence and to improve the standards, the guiding documents and the systems for their application.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87143 (URN)
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2014-10-08Bibliographically approved
    2. Products in environmental management systems: drivers, barriers and experiences
    Open this publication in new window or tab >>Products in environmental management systems: drivers, barriers and experiences
    2005 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 13, no 4, p. 405-415Article in journal (Refereed) Published
    Abstract [en]

    Do standardised environmental management systems (EMS) lead to improved environmental performance? This depends on to what extent these systems lead to changes in important flows of material and energy, which for manufacturing companies, in turn, mean that the product development process is important. Consequently, it appears vital to investigate the connection between EMS and ‘Design for the Environment’ (DFE), i.e. the connection between these management systems and concepts that deal with environmental issues in product development.

    This paper presents product-oriented environmental management systems (POEMS), including characteristics of existing models, experiences from projects where these models have been tested and experiences concerning the product connection in ‘normal’ EMS. It includes a discussion of important factors influencing to what extent DFE activities are integrated into EMS and/or the outcome of such integration.

    There are many motives for integrating the two concepts. Firstly, DFE thinking might enrich EMS by contributing with a life-cycle perspective. If EMS encompassed products' life cycles to a greater extent, they would be a better complement to the often facility-oriented legal requirements and authority control. Secondly, EMS might remove the pilot project character of DFE activities and lead to continuous improvement. Thirdly, integration could lead to successful co-operation, both internally and externally. However, existing studies show that there is a mixed picture concerning the extent ‘normal’ EMS currently encompass products.

    Keywords
    Product oriented environmental management systems; POEMS; Design for the Environment; DFE; Eco-design; ISO 14001; EMAS
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-13541 (URN)10.1016/j.jclepro.2003.12.005 (DOI)
    Available from: 2004-12-07 Created: 2004-12-07 Last updated: 2017-12-13
    3. Products in environmental management systems: the role of auditors
    Open this publication in new window or tab >>Products in environmental management systems: the role of auditors
    2005 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 13, no 4, p. 417-431Article in journal (Refereed) Published
    Abstract [en]

    For standardized environmental management systems (EMS) to be environmentally effective tools, they should affect important environmental aspects related to flows of materials and energy, which for manufacturing companies are closely connected to their products. This paper presents how external environmental auditors interpret and apply important product-related requirements of ISO 14001 at manufacturing companies in Sweden.

    The results indicate that the link between EMS and products is rather weak. Products are seldom regarded as significant environmental aspects and are therefore not within the main scope of many EMS, which are mainly focused on sites. However, all of the interviewed auditors require that some kind of environmental considerations be incorporated into product development, but these considerations are to large extent site oriented; how they are prioritized in relation to other factors such as economics and other customer priorities appears to be up to the companies.

    The paper includes some recommendations to strengthen the role of products within the framework of standardized EMS.

    Keywords
    Design for environment; DFE; Environmental management systems; EMS; ISO 14001; EMAS; Auditors
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-13542 (URN)10.1016/j.jclepro.2003.12.006 (DOI)
    Available from: 2004-12-07 Created: 2004-12-07 Last updated: 2017-12-13
    4. Auditing external environmental auditors: investigating how ISO 14001 is interpreted and applied in reality
    Open this publication in new window or tab >>Auditing external environmental auditors: investigating how ISO 14001 is interpreted and applied in reality
    2001 (English)In: Eco-Management and Auditing, ISSN 0968-9427, E-ISSN 1099-0925, Vol. 8, no 4, p. 183-192Article in journal (Refereed) Published
    Abstract [en]

    The ISO 14001 standard leaves a lot to be interpreted by its users. As the standard is growing in popularity the external environmental auditors are becoming key players in the environmental arena. Through interpretations, they form the linkage between the standard document and its application in reality.

    This study is based on interviews conducted with auditors representing all nine certification bodies in Sweden and at the board that accredits these firms. The paper presents how auditors interpret and apply central requirements of ISO 14001, with the aim to illuminate important issues from an environmental point of view.

    It can be concluded that many important requirements are interpreted differently. There are disagreements regarding what criteria are approved when determining which environmental aspects are significant. Further on, the standard's requirement for continual improvement is normally transformed to improvements regarding a few ratios. The paper, amongst other issues, also deals with auditors' competence, their objectivity and their opinions about the efforts of certified organizations.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87142 (URN)10.1002/ema.165 (DOI)
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2017-12-06
    5. Joint EMS and group certification: a cost-effective route for SMEs to achieve ISO 14001
    Open this publication in new window or tab >>Joint EMS and group certification: a cost-effective route for SMEs to achieve ISO 14001
    1999 (English)In: Greener Management International, ISSN 0966-9671, Vol. 28, p. 23-31Article in journal (Refereed) Published
    Abstract [en]

    Small and medium-sized enterprises (SMEs) are an important group from an environmental point of view and they also have environmental requirements - including environmental management systems (EMSs) - imposed on them by larger companies. At Hackefors Industrial District in Sweden, 30 SMEs are co-operating on environmental issues; they have formed a network and established a joint EMS in accordance with ISO 14001. This is a unique strategy for the implementation of EMSs by SMEs. In this paper the EMS model used at Hackefors is presented and the resulting cost savings are analysed. Environmental improvements are also discussed briefly. It can be concluded that, by networking and implementing a joint EMS, the SMEs (mostly small and 'micro' enterprises) at Hackefors have established a rational and cost-effective solution that has facilitated both the implementation and maintenance of EMSs. Although the EMSs have only recently been certified, many environmental and commercial improvements have already been observed. Many of the companies have received positive responses from their customers and believe that the EMS improves their ability to obtain contracts relating to sales of products and/or services. Furthermore, the companies at Hackefors believe that having an EMS based on ISO 14001 results in positive commercial and environmental effects.

    Place, publisher, year, edition, pages
    Greenleaf Publishing Ltd, 1999
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87141 (URN)
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2014-10-08
    6. Tracing business and environmental effects of environmental management systems: a study of networking small and medium-sized enterprises using a joint environmental management system
    Open this publication in new window or tab >>Tracing business and environmental effects of environmental management systems: a study of networking small and medium-sized enterprises using a joint environmental management system
    2003 (English)In: Business Strategy and the Environment, ISSN 0964-4733, E-ISSN 1099-0836, Vol. 12, no 3, p. 163-174Article in journal (Refereed) Published
    Abstract [en]

    In Hackefors Industrial District in Sweden, 26 small and medium-sized enterprises (SMEs) have formed an environmental network and implemented a joint environmental management system (EMS) according to ISO 14001. Based on interviews with the environmental co-ordinators at these enterprises, the effects on business and environmental efforts and impacts are analysed.

    It can be concluded that the joint EMS has resulted in better relations with important stakeholders, such as existing and potential customers. For example, three-fifths said that their EMS had made it easier to receive a contract for the sale of products and services. Several environmental improvements have been observed and are presented in the paper, many of which are considered as consequences of the EMSs. Moreover, based on observations during the study, this paper discusses how boundaries and screening affect the connection between EMSs and environmental performance.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-30058 (URN)10.1002/bse.357 (DOI)15518 (Local ID)15518 (Archive number)15518 (OAI)
    Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13
    7. The connection between environmental management systems and continual environmental performance improvements
    Open this publication in new window or tab >>The connection between environmental management systems and continual environmental performance improvements
    2002 (English)In: Corporate Environmental Strategy, ISSN 1066-7938, E-ISSN 1873-6912, Vol. 9, no 2, p. 183-192Article in journal (Refereed) Published
    Abstract [en]

    This paper discusses the connection between standardized environmental management systems and environmental performance, based on a case study. By comparing the environmental reviews for a group of small and medium-sized enterprises (SMEs) before and two years after their EMS implementation, we try to show how the environmental performance of these firms has developed and draw some conclusions regarding the connection between standardized EMSs and environmental performance in general.

    The case study illuminates some central aspects of ISO 14001's requirement of continual improvement. Taken together with the literature on this issue, it is clear that in practice a set of indicators are established and monitored, indicators concerning operations as well as management efforts. Hence, the selection of indicators is crucial. External environmental auditors should compare the development of these indicators and determine if an improvement has occurred or not. Naturally, this judgement by auditors is very important and difficult. The situation is very similar to the weighting step recognized as a problem in life cycle analysis, but the use of indicators for management efforts adds an additional dimension to this already intricate problem.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87140 (URN)10.1016/S1066-7938(02)00011-8 (DOI)
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2017-12-06
  • 16.
    Ammenberg, Jonas
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    How do standardised environmental management systems affect environmental performance and business?2001Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis aims to increase the understanding of what a standardised environmental management system (EMS) is, can be, and is not. The EMS infrastructure, i.e. the standards for EMSs and corresponding systems for their application, is analysed to find out how"ft affects the environmental efforts of companies. Furthermore, the topic of how standardised EMSs fit small and medium-sized enterprises (SMEs) is discussed. A special EMS solution used by a group of SMEs is examined to clarify how this model has affected the environmental efforts and business of these enterprises.

    The thesis is based on three studies. Firstly, external environmental auditors were interviewed. Secondly, the environmental reviews for the group of SMEs were studied. This study also involved a literature review on how to measure environmental performance. Thirdly, the environmental co-ordinators working at the mentioned small enterprises were interviewed.

    It can be concluded that it is too early to draw any general conclusions on how standardised EMSs affect environmental performance. How ISO 14001 is interpreted and applied is largely left to companies and external environmental auditors. In practise, 14001's requirement concerning continual improvement is often restricted to a few environmental aspects and does not say anything about the total environmental impact. Furthermore, there is an inconsistency in the standard text and its implementation concerning which criteria are approved when assessing environmental aspects. Some auditors allow the inclusion of criteria regarding economy and quality, etc. To ensure the credibility of ISO 14001, the standard and the systems for its application should be improved.

    The EMS model studied seems to be a cost-effective solution for SMEs that removes the most important barriers for EMS implementation and maintenance at small firms. Also, it appears to have led to significant environmental improvements.

    List of papers
    1. Auditing external environmental auditors: investigating how ISO 14001 is interpreted and applied in reality
    Open this publication in new window or tab >>Auditing external environmental auditors: investigating how ISO 14001 is interpreted and applied in reality
    2001 (English)In: Eco-Management and Auditing, ISSN 0968-9427, E-ISSN 1099-0925, Vol. 8, no 4, p. 183-192Article in journal (Refereed) Published
    Abstract [en]

    The ISO 14001 standard leaves a lot to be interpreted by its users. As the standard is growing in popularity the external environmental auditors are becoming key players in the environmental arena. Through interpretations, they form the linkage between the standard document and its application in reality.

    This study is based on interviews conducted with auditors representing all nine certification bodies in Sweden and at the board that accredits these firms. The paper presents how auditors interpret and apply central requirements of ISO 14001, with the aim to illuminate important issues from an environmental point of view.

    It can be concluded that many important requirements are interpreted differently. There are disagreements regarding what criteria are approved when determining which environmental aspects are significant. Further on, the standard's requirement for continual improvement is normally transformed to improvements regarding a few ratios. The paper, amongst other issues, also deals with auditors' competence, their objectivity and their opinions about the efforts of certified organizations.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87142 (URN)10.1002/ema.165 (DOI)
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2017-12-06
    2. Environmental management systems: scope assessment of environmental aspects
    Open this publication in new window or tab >>Environmental management systems: scope assessment of environmental aspects
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    This paper aims to increase the understanding of how standardised environmental management systems (EMSs) affect environmental performance. Based on interviews with environmental managers from 18 different companies and two environmental consultants, we make clear how companies identify, formulate and assess their environmental aspects.

    The results show that consultants have an important role concerning EMSs. Many of the environmental managers have deficient knowledge concerning their own EMS, since they cannot explain central EMS procedures. This can probably be explained by too much external assistance, from consultants, in combination with internal barriers such as lack of competence, time and motivation.

    The characteristics of the companies’ assessment methods are presented, which among other things include which parameters are used and their relative weight. From an environmental point of view, it is positive that environmental parameters, in general, have a big influence. However it should also be noted that some of the companies use methods in which business parameters seem to dominate. Other important results show that most systems, overall, are facility oriented. In most cases it was difficult to understand the scope of individual aspects, for example, concerning what environmental impacts were considered. A majority of the environmental managers were rather uncertain about issues in relation to scope and system perspectives. Therefore, it is recommended that incentives be taken to increase environmental managers’ competence and to improve the standards, the guiding documents and the systems for their application.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87143 (URN)
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2014-10-08Bibliographically approved
    3. Joint EMS and group certification: a cost-effective route for SMEs to achieve ISO 14001
    Open this publication in new window or tab >>Joint EMS and group certification: a cost-effective route for SMEs to achieve ISO 14001
    1999 (English)In: Greener Management International, ISSN 0966-9671, Vol. 28, p. 23-31Article in journal (Refereed) Published
    Abstract [en]

    Small and medium-sized enterprises (SMEs) are an important group from an environmental point of view and they also have environmental requirements - including environmental management systems (EMSs) - imposed on them by larger companies. At Hackefors Industrial District in Sweden, 30 SMEs are co-operating on environmental issues; they have formed a network and established a joint EMS in accordance with ISO 14001. This is a unique strategy for the implementation of EMSs by SMEs. In this paper the EMS model used at Hackefors is presented and the resulting cost savings are analysed. Environmental improvements are also discussed briefly. It can be concluded that, by networking and implementing a joint EMS, the SMEs (mostly small and 'micro' enterprises) at Hackefors have established a rational and cost-effective solution that has facilitated both the implementation and maintenance of EMSs. Although the EMSs have only recently been certified, many environmental and commercial improvements have already been observed. Many of the companies have received positive responses from their customers and believe that the EMS improves their ability to obtain contracts relating to sales of products and/or services. Furthermore, the companies at Hackefors believe that having an EMS based on ISO 14001 results in positive commercial and environmental effects.

    Place, publisher, year, edition, pages
    Greenleaf Publishing Ltd, 1999
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-87141 (URN)
    Available from: 2013-01-10 Created: 2013-01-10 Last updated: 2014-10-08
    4. Tracing business and environmental effects of environmental management systems: a study of networking small and medium-sized enterprises using a joint environmental management system
    Open this publication in new window or tab >>Tracing business and environmental effects of environmental management systems: a study of networking small and medium-sized enterprises using a joint environmental management system
    2003 (English)In: Business Strategy and the Environment, ISSN 0964-4733, E-ISSN 1099-0836, Vol. 12, no 3, p. 163-174Article in journal (Refereed) Published
    Abstract [en]

    In Hackefors Industrial District in Sweden, 26 small and medium-sized enterprises (SMEs) have formed an environmental network and implemented a joint environmental management system (EMS) according to ISO 14001. Based on interviews with the environmental co-ordinators at these enterprises, the effects on business and environmental efforts and impacts are analysed.

    It can be concluded that the joint EMS has resulted in better relations with important stakeholders, such as existing and potential customers. For example, three-fifths said that their EMS had made it easier to receive a contract for the sale of products and services. Several environmental improvements have been observed and are presented in the paper, many of which are considered as consequences of the EMSs. Moreover, based on observations during the study, this paper discusses how boundaries and screening affect the connection between EMSs and environmental performance.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-30058 (URN)10.1002/bse.357 (DOI)15518 (Local ID)15518 (Archive number)15518 (OAI)
    Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13
  • 17.
    Ammenberg, Jonas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Environmental Technique and Management.
    Miljömanagement2004Book (Other (popular science, discussion, etc.))
  • 18.
    Ammenberg, Jonas
    et al.
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Börjesson, Berit
    Altea AB, Sweden.
    Hjelm, Olof
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Joint EMS and group certification: a cost-effective route for SMEs to achieve ISO 140011999In: Greener Management International, ISSN 0966-9671, Vol. 28, p. 23-31Article in journal (Refereed)
    Abstract [en]

    Small and medium-sized enterprises (SMEs) are an important group from an environmental point of view and they also have environmental requirements - including environmental management systems (EMSs) - imposed on them by larger companies. At Hackefors Industrial District in Sweden, 30 SMEs are co-operating on environmental issues; they have formed a network and established a joint EMS in accordance with ISO 14001. This is a unique strategy for the implementation of EMSs by SMEs. In this paper the EMS model used at Hackefors is presented and the resulting cost savings are analysed. Environmental improvements are also discussed briefly. It can be concluded that, by networking and implementing a joint EMS, the SMEs (mostly small and 'micro' enterprises) at Hackefors have established a rational and cost-effective solution that has facilitated both the implementation and maintenance of EMSs. Although the EMSs have only recently been certified, many environmental and commercial improvements have already been observed. Many of the companies have received positive responses from their customers and believe that the EMS improves their ability to obtain contracts relating to sales of products and/or services. Furthermore, the companies at Hackefors believe that having an EMS based on ISO 14001 results in positive commercial and environmental effects.

  • 19.
    Ammenberg, Jonas
    et al.
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Hjelm, Olof
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    The connection between environmental management systems and continual environmental performance improvements2002In: Corporate Environmental Strategy, ISSN 1066-7938, E-ISSN 1873-6912, Vol. 9, no 2, p. 183-192Article in journal (Refereed)
    Abstract [en]

    This paper discusses the connection between standardized environmental management systems and environmental performance, based on a case study. By comparing the environmental reviews for a group of small and medium-sized enterprises (SMEs) before and two years after their EMS implementation, we try to show how the environmental performance of these firms has developed and draw some conclusions regarding the connection between standardized EMSs and environmental performance in general.

    The case study illuminates some central aspects of ISO 14001's requirement of continual improvement. Taken together with the literature on this issue, it is clear that in practice a set of indicators are established and monitored, indicators concerning operations as well as management efforts. Hence, the selection of indicators is crucial. External environmental auditors should compare the development of these indicators and determine if an improvement has occurred or not. Naturally, this judgement by auditors is very important and difficult. The situation is very similar to the weighting step recognized as a problem in life cycle analysis, but the use of indicators for management efforts adds an additional dimension to this already intricate problem.

  • 20.
    Ammenberg, Jonas
    et al.
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Hjelm, Olof
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Tracing business and environmental effects of environmental management systems: a study of networking small and medium-sized enterprises using a joint environmental management system2003In: Business Strategy and the Environment, ISSN 0964-4733, E-ISSN 1099-0836, Vol. 12, no 3, p. 163-174Article in journal (Refereed)
    Abstract [en]

    In Hackefors Industrial District in Sweden, 26 small and medium-sized enterprises (SMEs) have formed an environmental network and implemented a joint environmental management system (EMS) according to ISO 14001. Based on interviews with the environmental co-ordinators at these enterprises, the effects on business and environmental efforts and impacts are analysed.

    It can be concluded that the joint EMS has resulted in better relations with important stakeholders, such as existing and potential customers. For example, three-fifths said that their EMS had made it easier to receive a contract for the sale of products and services. Several environmental improvements have been observed and are presented in the paper, many of which are considered as consequences of the EMSs. Moreover, based on observations during the study, this paper discusses how boundaries and screening affect the connection between EMSs and environmental performance.

  • 21.
    Ammenberg, Jonas
    et al.
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Wik, Gunnar
    Hjelm, Olof
    Linköping University, Department of Mechanical Engineering, Environmental Technique and Management. Linköping University, The Institute of Technology.
    Auditing external environmental auditors: investigating how ISO 14001 is interpreted and applied in reality2001In: Eco-Management and Auditing, ISSN 0968-9427, E-ISSN 1099-0925, Vol. 8, no 4, p. 183-192Article in journal (Refereed)
    Abstract [en]

    The ISO 14001 standard leaves a lot to be interpreted by its users. As the standard is growing in popularity the external environmental auditors are becoming key players in the environmental arena. Through interpretations, they form the linkage between the standard document and its application in reality.

    This study is based on interviews conducted with auditors representing all nine certification bodies in Sweden and at the board that accredits these firms. The paper presents how auditors interpret and apply central requirements of ISO 14001, with the aim to illuminate important issues from an environmental point of view.

    It can be concluded that many important requirements are interpreted differently. There are disagreements regarding what criteria are approved when determining which environmental aspects are significant. Further on, the standard's requirement for continual improvement is normally transformed to improvements regarding a few ratios. The paper, amongst other issues, also deals with auditors' competence, their objectivity and their opinions about the efforts of certified organizations.

  • 22.
    Anbäcken, Els-Marie
    et al.
    Linköping University, Department of Welfare and Care (IVV). Linköping University, Department of Social and Welfare Studies, Social Work.
    Dahlgaard, Jens Jörn
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Quality Technology and Management.
    Must Be and Attractive Quality in Elder Care - Barriers and Challenges?2005In: QMOD Conference,2005, 2005, p. 71-Conference paper (Refereed)
  • 23.
    Andersson, Bo
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Hydraulisk riktningsventil2005Patent (Other (popular science, discussion, etc.))
    Abstract [sv]

    En hydraulisk riktningsventil av "öppet-centrum"-typ med ett ventilhus och en i detta rörlig vetilslid för reglering av flöde av hydraulfluid genom ventilen har en tryckkompenseringsventil anordnad i minst en för anslutning till en driven anordning avsedd arbetport för att tryckkompensera flödet från arbetsporten till den drivna anordningen.

  • 24.
    Andersson, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Open-center ventiler för framtidens mobila applikationer2004In: Fluid Scandinavia : specialtidningen för hydraulik och pneumatik, ISSN 1402-5590, Vol. 2, no 1Article in journal (Other academic)
  • 25.
    Andersson, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Over-centervenilers svängningsbenägenhet2004In: Hydraulikdagarna 2003,2003, Linköping, Sweden: Linköpings universitet , 2004Conference paper (Refereed)
  • 26.
    Andersson, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Variabla pumpar i mobila system2007In: Hydraulikdagar 07,2007, Linköping: Linköpings universitet , 2007Conference paper (Other academic)
    Abstract [sv]

    Det här föredraget behandlar olika systemprinciper för att styra en variabel pump i en mobil applikation. Variabla pumpar med elektrisk styrning ger möjlighet till nya intressanta systemprinciper.

  • 27.
    Andersson, Ingrid
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Krusell, Daniel
    Linköping University, Department of Physics, Chemistry and Biology.
    Lawrence, David
    Linköping University, Department of Physics, Chemistry and Biology.
    Dricksvatten, Finspångs Tekniska Verk AB2004Report (Other academic)
  • 28.
    Andersson, Ingrid
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Krusell, Daniel
    Linköping University, Department of Physics, Chemistry and Biology.
    Lawrence, David
    Linköping University, Department of Physics, Chemistry and Biology.
    Förslag till försök i fullskala på vattenverket vid Finspångs Tekniska Verk Ab2004Report (Other academic)
  • 29.
    Andersson, Ingrid
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Krusell, Daniel
    Linköping University, Department of Physics, Chemistry and Biology.
    Lawrence, David
    Linköping University, Department of Physics, Chemistry and Biology.
    Försök i fullskala på vattenverket vid Finspångs Tekniska Verk AB2004Report (Other academic)
  • 30.
    Andersson, Ingrid
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Krusell, Daniel
    Linköping University, Department of Physics, Chemistry and Biology.
    Lawrence, David
    Linköping University, Department of Physics, Chemistry and Biology.
    Processförbättring av dricksvattenproduktion vi Finspångs Tekniska Verk AB, Etapp 2, resultat från försök i pilotskala2004Report (Other academic)
  • 31.
    Andersson, Ingrid
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Applied Thermodynamics and Fluid Mechanics.
    Krusell, Daniel
    Linköping University, Department of Physics, Chemistry and Biology.
    Lawrence, David
    Linköping University, Department of Physics, Chemistry and Biology.
    Processförbättring av dricksvattenproduktion vid Finspångs Tekniska Verk AB, Etapp 1, Processanalys2004Report (Other academic)
  • 32. Andersson, J.
    et al.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Wallace, D.
    Multiobjective Optimization of Hydraulic Actuation Systems2000In: ASME Design automation conference,2000, 2000Conference paper (Other academic)
    Abstract [en]

       

  • 33.
    Andersson, J.
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Wallace, D.
    Department of Mechanical Engineering, Massachusetts Inst. of Technology, Cambridge, MA 02139, United States.
    Pareto optimization using the struggle genetic crowding algorithm2002In: Engineering optimization (Print), ISSN 0305-215X, E-ISSN 1029-0273, Vol. 34, no 6, p. 623-643Article in journal (Refereed)
    Abstract [en]

    Many real-world engineering design problems involve the simultaneous optimization of several conflicting objectives. In this paper, a method combining the straggle genetic crowding algorithm with Pareto-based population ranking is proposed to elicit trade-off frontiers. The new method has been tested on a variety of published problems, reliably locating both discontinuous Pareto frontiers as well as multiple Pareto frontiers in multi-modal search spaces. Other published multi-objective genetic algorithms are less robust in locating both global and local Pareto frontiers in a single optimization. For example, in a multi-modal test problem a previously published non-dominated sorting GA (NSGA) located the global Pareto frontier in 41% of the optimizations, while the proposed method located both global and local frontiers in all test runs. Additionally, the algorithm requires little problem specific tuning of parameters.

  • 34.
    Andersson, Jan-Erik
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Johansson, Gert
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Robot control for wood carving operations2001In: Mechatronics (Oxford), ISSN 0957-4158, E-ISSN 1873-4006, Vol. 11, no 4, p. 475-490Article in journal (Refereed)
    Abstract [en]

    The aim of this paper is to implement sensor control in wood carving operations. The introduction of wood carving is a step towards the development of a new manufacturing method for the wood manufacturing industry, where wood carving would facilitate increased freedom of the design choice. A control method that improves robot control and supports simpler programming, based on using an industrial robot equipped with a wrist mounted force/torque-sensor. is proposed for the wood carving process. This paper describes the structure and control algorithm of the system and how different machining parameters affect the cutting forces. The evaluation of the system showed that it is possible to control the cutting depth at speeds up to 7.5 mms by adjusting the rake angle of the tool to obtain a nominal force.

  • 35.
    Andersson, Johan
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Applications of a multi-objective genetic algorithm to engineering design problems2003In: Evolutionary Multi-Criterion Optimization Second International Conference, EMO 2003, Faro, Portugal, April 8–11, 2003. Proceedings / [ed] Carlos M. Fonseca, Peter J. Fleming, Eckart Zitzler, Lothar Thiele and Kalyanmoy Deb, Springer Berlin/Heidelberg, 2003, Vol. 2632, p. 737-751Chapter in book (Refereed)
    Abstract [en]

    This paper presents. the usage of a multi-objective genetic algorithm to a set of engineering design problems. The studied problems span from detailed design of a hydraulic pump to more comprehensive system design. Furin] thermore, the problems are modeled using-dynamic simulation models, response surfaces based on FE-models as well as static equations. The proposed method is simple and straight forward and it does not require any problem specific parameter tuning. The studied problems have all been successfully solved with the same algorithm without any problem specific parameter tuning. The resulting Pareto frontiers have proven very illustrative and supportive for the decisionmaker.

  • 36.
    Andersson, Johan
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Multiobjective optimization in engineering design: applications to fluid power systems2001Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis focuses on how to improve design and development of complex engineering systems by employing simulation and optimization techniques. Within the thesis, methods are developed and applied to systems that combine mechanical, hydraulical and electrical subsystems, so-called multi-domain systems. Studied systems include a landing gear system for a civil aircraft, electrohydrostatic actuation systems for aircraft applications as well as hydraulic actuation systems.

    The usage of simulation and optimization in engineering design is gaining wider acceptance in all fields of industry as the computational capabilities of computers increase. Therefore, the applications for numerical optimization have increased dramatically. A great part of the design process is and will always be intuitive. Analytical techniques as well as numerical optimization could however be of great value and can permit vast improvements in design.

    Within the thesis, a framework is presented in which modeling and simulation are employed to predict the performance of a design. Additionally, non-gradient optimization techniques are coupled to the simulation models to automate the search for the best design.

    Engineering design problems often consist of several conflicting objectives. In many cases, the multiple objectives are aggregated into one single objective function. Optimization is then conducted with one optimal design as the result. The result is then strongly dependent on how the objectives are aggregated. Here a method is presented in which the Design Structure Matrix and the relationship matrix from the House of Quality method are applied to support the formulation of the objective function.

    Another approach to tackle multiobjective design problems is to employ the concept of Pareto optimality. Within this thesis a new multiobjective genetic algorithm is proposed and applied to support the design of a hydraulic actuation system. The outcome from such a multiobjective optimization is a set of Pareto optimal solutions that visualize the trade-off between the competing objectives. The proposed method is capable of handling a mix of continuous design variables and discrete selections of individual components from catalogs or databases.

    In real-world situations, system parameters will always include variations to some extent, and this fact is likely to influence the performance of the system. Therefore we need to answer not only the question "What is best?", but also "What is sufficiently robust?" Within this thesis, several approaches to handle these two different questions are presented.

  • 37.
    Andersson, Johan
    et al.
    Maskinkonstruktion Tekniska fakultetet i Linköping.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    A multi-objective optimization approach to aircraft preliminary design2003In: World Aviation Congress,2003, Montreal, Canada: SEA , 2003Conference paper (Refereed)
  • 38.
    Andersson, Johan
    et al.
    Maskinkonstruktion Tekniska fakulteten.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Metamodel Representations for Robustness Assessment in Multiobjective Optimization2001In: The International Conference on Engineering Design ICED 01,2001, Glasgow, UK: ICED 01 , 2001Conference paper (Refereed)
    Abstract [en]

      

  • 39.
    Andersson, Johan
    et al.
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Multiobjective optimization of mixed variable design problems2001In: Evolutionary Multi-Criterion Optimization First International Conference, EMO 2001 Zurich, Switzerland, March 7–9, 2001 Proceedings / [ed] Eckart Zitzler, Lothar Thiele, Kalyanmoy Deb, Carlos Artemio Coello Coello and David Corne, Springer Berlin/Heidelberg, 2001, Vol. 1993, p. 624-638Chapter in book (Refereed)
    Abstract [en]

    In this paper, a new multiobjective genetic algorithm is employed to support the design of a hydraulic actuation system. First, the proposed method is tested using benchmarks problems gathered from the literature. The method performs well and it is capable of identifying multiple Pareto frontiers in multimodal function spaces. Secondly, the method is applied to a mixed variable design problem where a hydraulic actuation system is analyzed using simulation models. The design problem constitutes of a mixture of determining continuous variables as well as selecting components from catalogs. The multi-objective optimization results in a discrete Pareto front, which illustrate the trade-off between system cost and system performance.

  • 40.
    Andersson, Johan
    et al.
    Maskinkonstruktion Tekniska fakultetet i Linköping.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    The Evolve Project - a Mechatronic project for final year students2003In: International Conference in Engineering Design ICED03,2003, Stockholm, Sweden: ICED'03 , 2003Conference paper (Refereed)
  • 41.
    Andersson, Johan
    et al.
    Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
    Redhe, Marcus
    Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Response surface methods and pareto optimization in crashworthiness design2003In: Proceedings of Design Engineering Technical Conferences and Computers and Information in Engineering Conference/Design Automation Conference: Volume 2: 29th Design Automation Conference, Parts A and B, Chicago, USA: ASME , 2003, p. 473-479Conference paper (Refereed)
    Abstract [en]

    This paper presents a method where a multi objective optimization techniqueis used together with response surface methods in order to support crashworthiness design. As in most engineering design problems thereare several conflicting objectives that have to be considered when formulating a design problem as an optimization problem. Here this is exemplified by the desire to minimize the intrusion into the passenger compartment area and simultaneously obtain low maximum acceleration during vehicle impact. These two objectives are naturally conflicting, since low maximum acceleration implies large intrusion. The contribution of thispaper is to show a successful application of a set of existing methods to solve a real world engineering problem.The paper also presents methods of illustrating the results obtained from the multi-objective optimization.

  • 42.
    Andersson, Lars
    Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Information sharing in mobile robot teams: deployment with uncertainty consideration2004Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The work presented in this thesis deals with information sharing within mobile robot teams. Main focus is on information related to team positioning and localization. The goal of this research is to find models for how to best deploy a group of robots.

    The motion platforms covered are well adapted. although very important for the results. Motion models are crucial when calculating the dead reckoning of each platform. Results in the appended work show that the motion model has heavy impact on the possibility to affect the uncertainty of a robot team as new ground is deployed.

    The sensor models discussed may not necessarily be what is commonly used in the research field. Instead good approximations are used, that describe the main features of the sensor type. The focus is to present different sensor types and describe how the characteristics affect the uncertainty of the robot team, not to create new sensor models. A general model for sensors with polar measurement coordinates is derived. This can be used with different sensors with the same characteristics.

    A framework for sharing information within the robot team is derived. This is based on earlier work presented as "The Stochastic Map". However, the framework is tailored to suite the purpose of this work. Different estimation methods are also discussed, with main focus is on Kalman filtering techniques.

    The resulting part of this work present different ideas of what should be considered when deploying a group of robots. Results show how different dist ribution of sensors will affect the localization uncertainty of the group. It is also shown how different deployment formations affect the uncertainty within the team.

    List of papers
    1. On Sensor Fusion Between a Pair Of Heterogeneous Robots
    Open this publication in new window or tab >>On Sensor Fusion Between a Pair Of Heterogeneous Robots
    2003 (English)In: Proceedings of the 6th International Conference on Information Fusion, Cairns, Australia, 8th–11th July, 2003, 2003, p. 1287-1294Chapter in book (Other (popular science, discussion, etc.))
    Abstract [en]

    This paper present work in progress, aiming to find models that can be used as guidelines in how to best deploy a team of heterogeneous robots to solve a given task. That is, this research is focusing on how much each robot can increase the certainty about its own position and orientation in a global perspective as well as relative to other team members. It also, in some extent investigate what happens too the uncertainty and correlation within the group. The motive is to provide an insight into the utility of fusing position information communicated within the team, in aspect of increased accuracy. It also investigates in what way different usage of sensors will effect the results. Since the goal of the paper is insight, the minimum configuration of two robots and two landmarks is studied although the results are scalable to larger robot teams. The results show that by placing a camera on the moving robot measuring the bearing of a stationary robot gives better estimation of the moving robots orientation, which can be crucial for the solution of the association problem.

    Keywords
    Cooperative, Robot, Navigation, Distributed, Fusion, SLAM, CLAM
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-15106 (URN)0-9721844-4-9 (ISBN)
    Available from: 2008-10-16 Created: 2008-10-16 Last updated: 2013-11-04Bibliographically approved
    2. On utilizing geometric formations for minimizing uncertainty in 3 robot teams
    Open this publication in new window or tab >>On utilizing geometric formations for minimizing uncertainty in 3 robot teams
    2004 (English)In: Proceedings of The 8th Conference on Intelligent Autonomous Systems, IAS-8, Amsterdam, Netherlands, 10th–12th March, 2004, , p. 100-110p. 100-110Conference paper, Published paper (Refereed)
    Abstract [en]

    This paper presents work in progress, aiming to find models that can be used as guidelines in how to best deploy a team of robots to solve given tasks. The motive is to provide an insight into the utility in fusing position information communicated within the team, in aspect of increased accuracy in position and orientation estimate. The minimum configuration of three robots is studied. The robots are equipped with camera-like sensors that make omni directional bearing measurements to eachother. To reduce the free variables the formations are restricted so that two subordinate robots are located at the same distance to a master robot. For this configuration the information matrix is explored. A few formations are chosen and studied further, through simulations. The simulations show that there exists a breakpoint in traveled distance, where the formation minimizing orientation uncertainty for the master robot, changes from a column-formation to a line formation. The simulations also show that a line or column formations are not a good choice when balansed position uncertainty is required. In the case of balansing position uncertainty, a triangular formation is better.

    Publisher
    p. 100-110
    Keywords
    Geometric formations, minimize uncertainty
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-15319 (URN)9781586034146 (ISBN)
    Available from: 2008-10-31 Created: 2008-10-31 Last updated: 2013-11-04Bibliographically approved
    3. Effects on Uncertainty Utilizing Formation-Planning in Robot Teams
    Open this publication in new window or tab >>Effects on Uncertainty Utilizing Formation-Planning in Robot Teams
    2004 (English)In: Proceedings of The 5th Symposium on Intelligent Autonomous Vehicles, IAV 2004, Lisbon, Portugal, 5th–7th July 2004, 2004Conference paper, Published paper (Refereed)
    Abstract [en]

    This paper presents work in progress, aiming to find models that can be used as guidelines in how to best deploy a team of robots to solve given tasks. The motive is to provide an insight into the utility in fusing position information communicated within the team, in aspect of increased accuracy in position and orientation estimate. The minimum configuration of three robots moving over a flat surface is studied. The robots are equipped with omni-directional cameralike sensors that make bearing measurements to each other. To reduce the free variables the formations are restricted so that two subordinate robots are located at the same distance to a master robot. For this configuration the information matrix is derived and studied. There are numerical results presented that indicate how the uncertainty of the master robot changes depending of the bearing to the subordinate robots and the distance traveled.

    Keywords
    Multi-Robot, Cooperative, Formation, Localization
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-15320 (URN)
    Available from: 2008-10-31 Created: 2008-10-31 Last updated: 2013-11-04Bibliographically approved
  • 43.
    Andersson, Lars
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    On Group-Centric Topology Representation for Mobile Robot Teams2004Report (Other academic)
    Abstract [en]

    When dealing with robot localization and simultaneous map building one of the greates problem is to keep the created map consistent. Due to linearization, simplifications and other errors in models resent work has shown that the map created will, eventually, diverge. One way of dealing with these problems is to present the map in robot coordinates and thereby increase the consistency of the map. In the case many robots are used to create a map collectively this consistency problem often arises even sooner. This work propose a new method of dealing with the consistency problem when doing collaborative mapping by presenting the map in a groupcentric coordinate frame that continuously moves together with the robot team as new areas are explored.

  • 44.
    Andersson, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Berglund, Marcus
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Production Engineering.
    Camera Based Concept for Enhancement of IRB Accuracy using Fixed Features and SLAM2006In: 8th Biennal ASME Conference on Engineering Systems Design and Analysis,2006, Torino: ESDA , 2006Conference paper (Refereed)
    Abstract [en]

    A standard IRB (Industrial Robot) of today is not capable of positioning itsels to within better than 2-5mm relative to a given structure or object. In order to be able to perform high precision manufacturing, the requirement is less than 0,5mm. Existing solutions for 6DOF measurements to enhance the accuracy are not only expensive but also lacks flexibility. An affordable, accurate concept for IRB closed loop position feedback is presented here. This article proposes a method for using a camera together with fixed features to enhance the accuracy of an IRB in industrial manufacturing processes. The method is based on SLAM (Simultaneous Localization and Mapping), used to structure collected information about the features (mapping), and for the IRB to locate itself among the features (localization). The concept covers a scenario in which a set of features are placed within the working area. A camera is mounted on the IRB to observe (measure) the relative pose of the feature set. When the system is running observation of only one feature increases accuracy. However, in normal operation more features are observed which will increase accuracy further. The system setup is a standard IRB, ABB4400, on which a single camera with IR flash is mounted and used as sensor. The features are made out of reflectors that are placed in the production cell. The camera is also equipped with an IRfilter to improve the signal to noise ratio, simplifying image processing and accelerating execution. The execution time is critical since the goal is to sample at such rate that as to cover the dynamics of the robot. 

  • 45.
    Andersson, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Degerman, Pär
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Zachrison, Anders
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    PILZ -- Personal Indoor Localization Zone, Extended System Analysis and Design2006Report (Other academic)
  • 46.
    Andersson, Lars-Erik
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Applied Mathematics.
    Klarbring, Anders
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    A review of the theory of static and quasi-static frictional contact problems in elasticity2001In: Philosophical Transactions. Series A: Mathematical, physical, and engineering science, ISSN 1364-503X, E-ISSN 1471-2962, Vol. 359, p. 2519-2539Article in journal (Refereed)
  • 47.
    Andersson, Lars-Erik
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Applied Mathematics.
    Klarbring, Anders
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    A Survey of Basic Mathematical Results for Frictional Contact Problems2001In: From Convexity to Nonconvexity / [ed] Robert P Gilbert; P D Panagiotopoulos; P M Pardalos, Dordrecht/Boston/London: Kluwer , 2001, p. -392Chapter in book (Other academic)
    Abstract [en]

    Contains a collection of invited papers dedicated to the memory of two great mathematicians, Gaetano Fichera and Panagis Panagiotopoulos. The book is centered around the seminal research of G Fichera on the Signorini problem, hemivariational inequalities, nonsmooth global optimization, and regularity results for variational inequatities.

  • 48.
    Andersson, Lars-Erik
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Applied Mathematics.
    Klarbring, Anders
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    Existence and uniqueness for quasistatic contact problems with friction2001In: CMIS 2001, third Contact Mechanics International Symposiium,2001, Dordrecht: Kluwer , 2001, p. 245-Conference paper (Refereed)
  • 49.
    Andersson, Lars-Erik
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Applied Mathematics.
    Klarbring, Anders
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    Existence and Uniquness of Steady State Solutions in Thermoelastic Contact with Frictional Heating2004In: International Congress of Theoretical and Applied Mechanics,2004, 2004, p. 215-215Conference paper (Refereed)
  • 50.
    Andersson, Lars-Erik
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Applied Mathematics.
    Klarbring, Anders
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Engineering Mechanics.
    Quasi-static Frictional Contact of Discrete Mechanical Structures2000In: European journal of mechanics. A, Solids, ISSN 0997-7538, E-ISSN 1873-7285, Vol. 19, p. S61-S67Article in journal (Refereed)
1234567 1 - 50 of 1190
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf