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  • INNOTRACK: Concluding technical report
  • 2010
  • Samlingsverk (redaktörskap) (övrigt vetenskapligt)abstract
    • The track structure, rails, switches and crossings account for more than 50% of maintenance and renewal costs for the rail industry. To improve the competitiveness of rail transportation, the cost-efficiency of these areas needs to be addressed. This the background to INNOTRACK, an integrated research project funded by the European Commission’s 6th research framework pro- gramme. Running from September 2006 to December 2009, INN- OTRACK has developed a multitude of innovative solutions in the areas of track substructure, rails & welds, and switches & crossings. The solutions have been assessed from technical, logistics and life cycle cost point of views. This Concluding Technical Report of INNOTRACK includes an overview of the project. It further details implementable results, and clusters them into ”highlight” areas. In addition, the book acts as a ”key” to the vast amount of information from INNOTRACK: All sections refer to project reports where more information can be found.
  • Högman, Ulf, 1961-, et al. (författare)
  • Requirements on New Technology and the Technology Implementation Process
  • 2010
  • Ingår i: Proceedings of NordDesign 2010, August 25-27, Gothenburg, Sweden. - 978-91-633-7064-2 ; 2, s. 289-300
  • Konferensbidrag (refereegranskat)abstract
    • In literature, many authors have pointed to the importance of technology and technology development for company competitiveness. In this study we aim to study the technology in more detail and attempt to develop an understanding on the requirements and needs on “technology” from the perspective of product development. The research question which we aim to answer in this study is: “What are the requirements on maturity of technology when this technology is about to enter into the product development process?“ A qualitative research strategy, based on three study cases involving 17 interviewees, has been chosen. All three cases come from one single company, Volvo Aero Corporation (VAC) in Sweden, in the context of the aero engine industry. The study contributes with a broad mapping of requirements and how they relate to different categories of technologies, showing big differences both regarding content and timing. It is concluded that attention should be payed both to how the organization builds new capabilities and to the capabilities of the technology itself. A surprisingly complicated picture on the requirements relating to the implementation of new technologies has emerged in the study. This contributes to the understanding regarding the difficulties of developing new technology and integrating it into an application.
  • Yarmohamadi, Hoda, 1980-, et al. (författare)
  • Modeling of elastomeric engine mounts for commercial vehicles
  • 2007
  • Ingår i: Proceedings of the 20th Nordic Seminar on Computational Mechanics, NSCM 20, R.Larsson and K. Runesson (eds.), 23-24 November, 2007, Göteborg, Sweden. - 1652-8549.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • In this paper, a model of the conventional engine mount is developed and the nonlinear behavior of dynamic stiffness and damping of the engine mounts of commercial vehicles are investigated. The model comprises elastic, viscous and friction functional components and expresses the stiffness and damping of the mount as a function of frequency and amplitude of harmonic excitation. Optimization is done to identify model parameters using measurements for real elastomeric engine mounts.
  • Kyprianidis, Konstantinos, 1984-, et al. (författare)
  • Multidisciplinary Analysis of a Geared Fan Intercooled Core Aero-Engine
  • 2014
  • Ingår i: Journal of Engineering For Gas Turbines and Power. - 0742-4795. ; 136:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The reduction of CO2 emissions is strongly linked with the improvement of engine specific fuel consumption, along with the reduction of engine nacelle drag and weight. One alternative design approach to improving specific fuel consumption is to consider a geared fan combined with an increased overall pressure ratio intercooled core performance cycle. The thermal benefits from intercooling have been well documented in the literature. Nevertheless, there is very little information available in the public domain with respect to design space exploration of such an engine concept when combined with a geared fan. The present work uses a multidisciplinary conceptual design tool to analyze the option of an intercooled core geared fan aero engine for long haul applications with a 2020 entry into service technology level assumption. With minimum mission fuel in mind, the results indicate as optimal values a pressure ratio split exponent of 0.38 and an intercooler mass flow ratio of 1.18 at hot-day top of climb conditions. At ISA midcruise conditions a specific thrust of 86 m/s, a jet velocity ratio of 0.83, an intercooler effectiveness of 56%, and an overall pressure ratio value of 76 are likely to be a good choice. A 70,000 lbf intercooled turbofan engine is large enough to make efficient use of an all-axial compression system, particularly within a geared fan configuration, but intercooling is perhaps more likely to be applied to even larger engines. The proposed optimal jet velocity ratio is actually higher than the value one would expect by using standard analytical expressions, primarily because this design variable affects core efficiency at mid-cruise due to a combination of several different subtle changes to the core cycle and core component efficiencies at this condition. The analytical expressions do not consider changes in core efficiency and the beneficial effect of intercooling on transfer efficiency, nor do they account for losses in the bypass duct and jet pipe, while a relatively detailed engine performance model, such as the one utilized in this study, does. Mission fuel results from a surrogate model are in good agreement with the results obtained from a rubberized-wing aircraft model for some of the design parameters. This indicates that it is possible to replace an aircraft model with specific fuel consumption and weight penalty exchange rates. Nevertheless, drag count exchange rates have to be utilized to properly assess changes in mission fuel for those design parameters that affect nacelle diameter.
  • Berg, Magnus, 1975- (författare)
  • Factors affecting production ramp-up performance
  • 2007
  • Licentiatavhandling (övrigt vetenskapligt)abstract
    • The ability to successfully ramp-up the production when new products are to be introduced has become a critical issue for many manufacturing companies. Increased globalisation which implies severe competition makes it important both for original equipment manufacturers but also for their suppliers to perform better than potential competitors during ramp-up. Moreover, constantly decreasing product life cycles and constantly increase of individualised customer demands implies that production ramp-up has to be performed more frequent. Hence, this frequency makes it necessary to realise production ramp-ups both in a time efficient and cost efficient manner in order to be competitive. So far a lot of researches have focused the scope of time-to-market which ends when the first product is commercialised and very few researches have focused the time-to-volume which includes the process of ramping up to full production. Consequently the knowledge and supportive tools, such as a production ramp-up framework, that are available in order to manage production ramp-up in a successful manner is today rather sparse. Hence, to provide a starting point for a framework that can be used when managing production ramp-up the objective of this thesis is to identify and categorise factors that affect the production ramp-up performance. The identification of factors affecting production ramp-up performance has partly been done by reviewing previous research findings. Moreover, since previous studies of factors affecting production ramp-up performance are few, two case studies have been undertaken with the intention to complement and add knowledge to what could be found in previous research. These case studies focus the preparations for and the realisation of production ramp-ups in two assembly systems within a Swedish manufacturing company. The contribution from this thesis is a categorisation and a scrutiny of the factors identified to affect the production ramp-up performance found both in previously research and in empirical studies. The main conclusion is that several of the factors affecting the production ramp-up performance are dependent on each other both through chain relations and mutual relations. Moreover it has been concluded that the effect of different factors during the design and production preparation process and the production ramp-up process are dependent on the factors that constitute the production ramp-up situation. Therefore it has also been concluded that a useful categorisation needs to separate the factors that constitute the production ramp-up situation from factors during the design and production preparation process and the product ramp-up process. One reason for this is that such a categorisation facilitates the possibilities to compare different production ramp-ups to each other and learn from this. Moreover this type of categorisation can be supportive when different factors need to be prioritised during a production ramp-up in a certain situation.
  • Danilovic, Mike, 1955-, et al. (författare)
  • Kalmar Industries Supplier Network
  • 2012
  • Ingår i: Design Structure Matrix Methods and Applications. - Boston : MIT Press. - 978-0-26201-752-7 ; s. 317-324
  • Bokkapitel (övrigt vetenskapligt)abstract
    • Kalmar Industries produces heavy-duty materials handling equipment such as reach-stackers that are used in port and transportation operations. To deliver anticipated large customer orders of reach-stackers in a limited time frame, Kalmar worked to strengthen and intensify its collaboration with three major suppliers, Hiflex, Euromaster, and Kone, in a joint, co-located industrial network. The major challenge was to design the collaborative and information exchange processes between the four companies.
  • Fjällström, Sabina, 1975-, et al. (författare)
  • Information enabling production ramp-up
  • 2009
  • Ingår i: Journal of Manufacturing Technology Management. - 1741-038X. ; 20:2, s. 178-196
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose – This paper seeks to identify information enabling and supporting production ramp-up processes, by exploring critical events and the role of information in such events.Design/methodology/approach – The research approach was based on empirical and theoretical investigations. A selection of 30 events, considered the most critical for production ramp-up realization and/or performance at one Swedish automotive company, were categorized and constituted the base for the analysis which focused information types and sources enabling event handling.Findings – Information enabling event handling is a balanced combination of problem and domain information, regardless of event category. However, a differentiation concerning preference and usage of information types between experienced and less experienced personnel is identified. Problem-solving information has the character of pragmatic information, composed of complementary parts of confirmation and novelty in terms of domain and problem information. The preferred information source in all event categories was “other people”.Research limitations/implications – The study focuses on the application of information in relation to critical events during production ramp-up. General information theory is not addressed in depth.Practical implications – Information type and information source are not dependent on certain event categories, which allows a general information strategy enabling production ramp-up. To facilitate production ramp-up and event handling managers and key personnel need to apply a holistic perspective and need to be updated on domain information of the products, the equipment, and the production process during production ramp-up.Originality/value – The originality is in the focus and role of information to achieve an efficient production ramp-up performance. A supporting model is developed which describes the structure of pragmatic information for personnel with various levels of experience, regardless of event category.
  • Stillström, Carin (författare)
  • The Concept of Mobile Manufacturing
  • 2007
  • Licentiatavhandling (övrigt vetenskapligt)abstract
    • There is a need for a manufacturing concept that is characterized by ease in changing between manufacturing places, ease in producing wherever it is convenient for the moment, ease in collaborating with different partners, and reconfigurability and reuse of manufacturing capacity, while at the same time keeping control of the own capabilities.The objective of this thesis is to investigate and describe the concept of mobile manufacturing in order to find new ways of competing for the manufacturing industry. The concept of mobile manufacturing is characterized by changeability, where mobility is defined as the ability to change between geographical places with little penalty in time, effort, cost, or performance. A mobile manufacturing system is thus a system that efficiently changes between different departments or sites and is easily reconfigured to fit different orders and locations.This thesis consists of a comparison of five cases where mobile manufacturing systems were developed and realized. The mobility characteristic in those manufacturing systems has been analysed. Factors affecting mobility and how the mobile manufacturing system is designed have been described, such as the organizational and geographical distance that the mobile manufacturing module is transported, and different types of management and ownership structure. A great range of mobility has thereby been identified and it has been shown that there are different dimensions of mobile manufacturing.By viewing the mobile manufacturing system in a life-cycle perspective, the focus has been on the iterative reuse of the manufacturing system. Mobile manufacturing equipment could be used, for example, in order to perform low-frequency operations or to cope with occasional volume peaks. There are a number of advantages of mobile manufacturing that make it a potential future manufacturing concept: instead of investing in new equipment, mobile manufacturing modules could be used and shared by several actors; efficiency is maximized; mobile manufacturing gives opportunities for joint investments; and it also enables moving closer to the customer or reaching new markets.
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