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1
Östlin, Johan. "On Remanufacturing Systems : Analysing and Managing Material Flows and Remanufacturing Processes". Doctoral thesis, Linköpings universitet, Monteringsteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11932.
Testo completoAbstract (sommario):
The aim of remanufacturing is to retrieve a product’s inherent value when the product no longer fulfils the user’s desired needs. By taking advantage of this inherent value through different product recovery alternatives, there is a potential for both economically and environmental advantageous recovery of products. Remanufacturing is a complex business due to the high degree of uncertainty in the production process, mainly caused by two factors: the quantity and the quality of returned products. These factors have implications both on the external processes, e.g. coordinating input of returned products with the demand for remanufactured products, as well as the internal processes that coordinates the operations within the factory walls. This additional complexity needs to be considered when organising the remanufacturing system. The objective of this dissertation is to explore how remanufacturing companies can become more competitive through analysing and managing material flows and remanufacturing processes. The first issue discussed in this dissertation is the drivers that make companies interested in remanufacturing products in the first place. The conclusion is that the general drivers are profit, company policy and the environmental drivers. In a general sense, the profit motivation is the most prevalent business driver, but still there are situations where this motivation is secondary to policy and environmental drivers. Secondly, the need to balance the supply of returned products with the demand for remanufactured products shows that the possible remanufacturing volumes for a product are dependent on the shape of the supply and demand distributions. By using a product life cycle perspective, the supply and demand situations can be foreseen and support is given on possible strategies in these different supply and demand situations. Thirdly, how used products are gathered from customers is categorised by seven different customer relationship types. These types all have different effects on the remanufacturing system, and the characteristics of these relationships are disused in detail. When considering the remanufacturing process within the factory walls, a generic remanufacturing process was developed that divides the remanufacturing process into five different phases; pre-disassembly, disassembly, reprocessing, reassembly and the post-assembly phase. These different phases are separated by three different key decision points in the process that also have a major impact on the material planning of the process. For the remanufacturing material planning and production planning, the possibility to apply lean principles can be difficult. One foundation for implementing lean principles in new production is the existence of standardised processes that are stable and predictable. In the remanufacturing system, the possibilities to realise a predictable process is limited by the “normal” variations in quantity and the quality of the returned cores. Even though lean principles can be problematic to implement in the remanufacturing environment, this dissertation proposes a number of solutions that can be used to make the remanufacturing process leaner.
2
Östlin, Johan. "On remanufacturing systems : analysing and managing material flows and remanufacturing processes /". Linköping : Department of Management and Engineering, Linköpings universitet, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11932.
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3
Dunkel, Mathias. "Methodenentwicklung für lean remanufacturing". Aachen Shaker, 2007. http://d-nb.info/987862596/04.
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4
Dunkel, Mathias. "Methodenentwicklung für Lean Remanufacturing /". Aachen : Shaker, 2008. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016700053&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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5
Boustani, Avid. "Remanufacturing and energy savings". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/58461.
Testo completoAbstract (sommario):
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 205-213).
The substantial growth in industrial production, demand for materials, and population has led to an increasing need for sustainable manufacturing processes to mitigate the negative impacts on the environment and meet the needs of future generations. One proposed direction is remanufacturing, which is a process whereby used products having reached their end-of-life, are restored back to useful service-life. Remanufacturing utilizes the energy and embedded value retained in a product upon reaching end-of-life. Remanufacturing can close the loop between disposal and supply chains, extend the service lifetime of products, conserve resources, and help mitigate environmental consequences attributed to landfilling. Moreover, by preserving the geometrical architecture of cores, remanufacturing can reduce the needs for raw material processing and many manufacturing processes, hence, saving energy. A critical issue to consider when evaluating energy savings in remanufacturing is the product use phase: how well does the remanufactured device perform in the use phase compared to a similar new product from an energy standpoint? To answer this question, we utilize Life Cycle Assessments framework. Using this methodology, we quantify cumulative energy demands of a remanufactured product during its lifecycle and compare it to an equivalent new product. We conduct an analysis of lifecycle energy savings of remanufacturing for 19 different products in 8 distinct product case studies (4 product case studies discussed in detail in this thesis).
(cont.) By performing lifecycle evaluations we conclude that remanufacturing can be a net energy-saving option for products that have energy requirements dominated by the production phase. Moreover, our energy analysis sheds light on the importance of considering use phase while evaluating the energy savings potential of remanufacturing. We conclude that from a total life cycle perspective, remanufacturing may be a net energy saving as well as a net energy expending end-of-life option. We argue that in investigating energy savings of remanufacturing as an end-of-life option, one should also evaluate large-scale critical factors in order to effectively address the systems challenges associated with remanufacturing. Our retrospective approach signifies the importance of studying critical factors such as technological improvements, policy interventions, economic incentives, and business models in order to draw inferences about energy and economic savings potential of remanufacturing. In addition, we argue that the generalized claims about remanufacturing as the ultimate end-of-life option are not only subject to dynamic global changes, but also restricted by the limitations in the lifecycle environmental methodologies. Lastly, we conclude that the evaluations for product remanufacturing and energy savings are more valuable and justified if conducted on a case-by-case basis.
by Avid Boustani.
S.M.
6
Cuppernull, Michael J. 1957. "Aircraft remanufacturing process improvement analysis". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/88823.
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7
Mitra, Supriya Ranjan. "Essays on competitive strategy in remanufacturing". Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.
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8
Langella, Ian M. "Planning demand-driven disassembly for remanufacturing". Wiesbaden : Dt. Univ.-Verl, 2007. http://www.gbv.de/dms/zbw/526943912.pdf.
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9
Lindahl, Mattias, Erik Sundin e Johan Östlin. "Environmental issues with the remanufacturing industry". Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-35502.
Testo completoAbstract (sommario):
Researchers often regard remanufacturing as an environmentally beneficial end-of-life option. There have been, however, few environmental measurements performed in the area. The aim of this paper is to identify general environmental pros and cons with remanufacturing. This is done through the analysis of practical examples in remanufacturing industries. Life Cycle Assessment methodology has been used for the environmental validations. The first conclusion, based on the industrial cases and the literature review, is that remanufacturing is preferable from a material resource perspective when compared with manufacturing of new products. The second conclusion is that remanufacturing is preferable from a more overarching perspective for some of the investigated cases, but it is not possible to draw any general conclusions since the companies studied are few and benefits from remanufacturing are highly context-related.
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Amezquita, Tony. "Lean remanufacturing in the automotive industry". Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/23166.
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Dunkel, Mathias [Verfasser]. "Methodenentwicklung für Lean Remanufacturing / Mathias Dunkel". Aachen : Shaker, 2008. http://d-nb.info/1164342738/34.
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12
Kulkarni, Anand. "The impact of RFID on remanufacturing". Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612881.
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13
Al-Nuaimi, Mina, e Lina Widegren. "Component remanufacturing for improved lifecycle utilization". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-52845.
Testo completoAbstract (sommario):
Remanufacturing is the process of collecting end-of-life products from customers and then being dissembled, reprocessed and reassembled to create new products to meet the customers’ needs. The economic viability of the implementation of a remanufacturing strategy has being shown among many companies in the automobile industry. Also, the economic profitability of the remanufacturing process has been proven in many industrial case studies. Cummins Scania XPI Manufacturing in Södertälje considers implementing a remanufacturing process for their returned components, but there is a lack of a foundation of whether this process will provide an economic profitability or not. In order to decide whether the remanufacturing is profitable for the company, there are some factors to consider. This research aims to identify the reasons behind implementing a remanufacturing process and the factors that affect the economical profitability of it. In order to answer the research questions, a theoretical investigation as well as several interviews with Cummins Scania XPI Manufacturing in Södertälje and Cummins XPJ in Mexico has been done. The aim with the interviews with Cummins Scania XPI in Södertälje was to identify what factors they want to consider when determining whether the remanufacturing process can be economic beneficial for them. The interview with Cummins XPJ was done in order to get an understanding how their remanufacturing process work. The result shows that there can be three main reasons behind implementing a remanufacturing process: economic benefits, environmental benefits as well as legislation. When it comes to the considered factors when implementing the remanufacturing process, the reverse logistic with the aim to remanufacture is important to consider since the remanufacturing is a fundamental process of it. Thereafter the possible factors that can be occurred are one-time costs such as prices of machines, fixed costs such as operators’ costs and where to implement the process. The results of this research provide a possibility for companies to determine whether the remanufacturing process is economically profitable for them.
14
Unal, Muruvvet. "Centralization And Advance Quality Information In Remanufacturing". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611109/index.pdf.
Testo completoAbstract (sommario):
In this study, value of quality information and the eects of centralization are investigated
for a reverse supply chain consisting of a remanufacturer and a collector. Used products are
collected and inspected to classify them into quality groups, then they are remanufactured to
meet the demand of remanufactured products. The supply of collected products and demand
of remanufactured products are both price-sensitive. The uncertain quality of the collected
products is revealed by an inspection process. Two quality classes are considered, and the cost
of remanufacturing depends on the quality class. The main decisions are on acquisition fee for
the returns, the selling price for remanufactured products, and the transfer prices of inspected
products between the collector and the remanufacturer. For this environment, centralized
and decentralized settings are considered and dierent models that dier in availability of
quality information when the pricing decisions are made are built. We explore the value of
advance quality information and eects of centralization on the optimal prices and profits via
a computational study.
15
Sundin, Erik. "Product and Process Design for Successful Remanufacturing". Doctoral thesis, Linköping : Univ, 2004. http://www.ep.liu.se/diss/science_technology/09/06/index.html.
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Hammond, Richard C. II. "The development of design metrics for remanufacturing". Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/16851.
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Johan, Eklund. "Automation in Remanufacturing : Robots flexibility and usage". Thesis, Linköpings universitet, Industriell Produktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170884.
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18
Chatterjee, Priyanka M. "Sustainability implications of remanufacturing textiles in India". Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/124591.
Testo completoAbstract (sommario):
Thesis: S.M. in Technology and Policy, Massachusetts Institute of Technology, School of Engineering, Institute for Data, Systems, and Society, 2018Cataloged from PDF version of thesis.
Includes bibliographical references (pages 529-543).
With the increasingly unsustainable nature of industrialized and industrializing nations, new industrial processes are being explored to determine a more sustainable pathway for countries looking to boost their manufacturing presence and competitiveness. In this thesis, we present a "proactive" policy framework for India's sustainable development via the introduction of remanufacturing, at-scale, for India's textile industry using qualitative trade-off analysis that "co-optimizes" for tripartite (international, national, and sub-national) governmental-level and firm-level policies to achieve improvements within the 3 Pillars of Sustainability: namely Economic, Environmental, and Employment Sustainability. The research begins with an analysis of India's sustainable development history, its current status, and its goals for future sustainable development.
The current status and history of the Indian textile industry, and its relevant policies, were subsequently studied, analyzed, and described in detail. The thesis then introduces and analyzes the specific industrial strategy of "remanufacturing" that has the potential to be a sustainable industrial opportunity for India's textile sector. The major process, technological, environmental and occupational, sociopolitical, and economic requirements for and challenges involved in adopting textile remanufacturing at-scale are discussed. We outline the major policy interventions and instruments that international organizations, Indian national and state governments, as well as individual firms can take to enable the introduction of remanufacturing in the textile industry, aligned with the 3 Pillars of Sustainability.
The thesis concludes by providing a set of "Roadmaps" for government-level and firm-level policies for textile remanufacturing under each Pillar, with the final one being a "Co-Optimized" Roadmap that considers the benefits and tradeoffs, of the policies identified, for all 3 Pillars, and which details a set of policies that, if implemented, has the possibility to set India on a more sustainable industrial pathway.
by Priyanka M. Chatterjee.
S.M. in Technology and Policy
S.M.inTechnologyandPolicy Massachusetts Institute of Technology, School of Engineering, Institute for Data, Systems, and Society
19
Goodall, Paul A. "Decision support for assessing the feasibility of a product for remanufacture". Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/17849.
Testo completoAbstract (sommario):
Remanufacturing is the process of restoring old, damaged and failed products to a condition as good as new . Whilst the practice of remanufacture has been conducted for almost a century, the attention it receives within mainstream business is increasing due to potential benefits associated with economic savings and reduced environmental impact. There are several challenges in operating a successful remanufacturing business, one of which is how to assess the feasibility of remanufacturing. Remanufacturing does not lend itself towards every product due to factors related to the product, process, market and business capabilities, therefore careful assessment should be conducted before taking on a remanufacturing endeavour. This thesis reports the research undertaken to aid decision makers assessing the feasibility of a product for remanufacture. The aim has therefore been to determine the requirements of assessing remanufacturing feasibility, then to develop a tool to support this activity. Requirements of the decision making process were established through a detailed review of the literature supplemented with additional interviews from remanufacturing businesses, whilst research gaps for support tools were identified through a systematic review of existing tools presented within academia. Through these reviews it was determined that current methods do not provide enough support in determining the impact of uncertainties found within remanufacturing against key assessment criteria, such as economic cost. Focus upon the tool development was therefore directed at estimating remanufacturing cost of a product under uncertain conditions. The tool was designed, utilising techniques such as Monte Carlo analysis, fuzzy sets and case based reasoning. A prototype of the tool was then implemented within an object oriented structure and deployed as web service. Testing and validation were conducted by demonstrating the functionality of the tool against a set of specification requirements, through two contrasting remanufacturing case studies identified within industry. In summary this research has developed a tool to support the assessment of remanufacturing viability through cost estimation under uncertain conditions, identifying requirements through a detailed literature review and interviews with industry and providing validation through two detailed case studies. The tool is novel in its ability to calculate both cost and the risk associated with the uncertainties present within the remanufacturing domain.
20
Mähl, Maria, e Johan Östlin. "Lean Remanufacturing : Material Flows at Volvo Parts Flen". Thesis, Uppsala University, Department of Business Studies, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7985.
Testo completoAbstract (sommario):
The after market is of great importance of a company’s competitiveness and an increasing part of its revenues can be derived from it. Remanufacturing, in focus of this thesis, is a great business opportunity and the European market has an enormous growth potential. In the USA it is a major business and the automotive industry, targeted in this thesis, sells approximately 60 million remanufactured automotive products compared to 15 million products in Europe for an equivalent stock of vehicles
Compared to manufacturing, the remanufacturing environment is a more complex business due to the high degree of uncertainty in the production process, mainly caused by two factors: the quantity and quality of returned cores. Overall, seven characteristics that make the remanufacturing material flow harder to control have been identified. Emerging in the 1990’s the concept of Lean production is a well-known method for improving the manufacturing capabilities of a company. Lean production, which is said to increase productivity, decrease lead-time and costs and enhance quality, is widely adopted.
In this thesis, the purpose is to explore what characteristics of the remanufacturing environment that can hinder the implementation of Lean production principles of material flows and how Lean principles can be employed in a remanufacturing environment.
In accordance, the theories of Lean production and Remanufacturing are used and the research methodology chosen that of a case study. To assess material flow, the production flows of five major product groups in a car engine are assessed. For the collection of data, Value Stream Mapping (VSM) methodology has been used.
The main result about material flows and how Lean principles can be employed in a remanufacturing environment have resulted in eight generic proposals. The main conclusion from these proposals is that the inherent characteristics of variable processing times and uncertainty in materials recovered have major negative impact for implementing a lean production process. Vice versa, given an accurate supply of parts for reassembly, all the principles of Lean production can be fully implemented in the phases of reassembly and testing.
21
Chittamvanich, Suphalat. "Adjusting remanufacturing capacity using sales and return information". [Ames, Iowa : Iowa State University], 2007.
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22
Méndez, de la Luz Diego A. 1979. "Improving supply chain responsiveness for diesel engine remanufacturing". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67774.
Testo completoAbstract (sommario):
Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Engineering Systems Division; in conjunction with the Leaders for Global Operations Program at MIT, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 71).
Achieving a significant reduction in order-to-shipment lead-time of remanufactured diesel engines can dramatically decrease the amount of finished goods inventory that Caterpillar needs to carry in order to meet its delivery commitments to Cat dealers around the globe. This project was launched to devise ways to hold less finished goods by reducing the order-to shipment lead time for diesel engines. To achieve this goal, a team was formed with representatives of all business units involved in the supply chain. Following the first three steps of a DMAIC methodology, the team used the following techniques and made the consequent findings: (1) Define: using Value Stream Mapping, a first-ever value stream map of the supply chain was developed. This identified gaps and focused efforts on key areas. (2) Measure: using statistical lead time analysis, a Monte Carlo simulation was performed to estimate order-to-shipment lead times for the baseline and optimized scenarios of a build-to-order scheme. This identified an opportunity to reduce lead times by increasing parts inventory. (3) Analyze: an inventory model was developed to quantify the economic implications of reducing lead time by increasing inventories. The results were compared to the savings of holding less finished goods to find out the best lead time reduction scenario. Results show that holding inventories as spare parts to enable a build-to-order strategy is less costly than relying on a build-to-stock strategy, but there is a point of diminishing returns. Our research has shown that having all business units collaborate in the process of overhauling the supply chain is key when looking for results that are optimal for the enterprise as a whole. It has also been observed that, if left unattended, a supply chain can be shaped by decisions that, at best, manage to achieve only local optima. In the worst case, the whole supply chain may evolve into a system that has little to do with the company's strategic goals. These observations highlight the need, and support the recommendation, to have a "process owner" who is responsible for coordinating efforts across the supply chain.
by Diego A. Méndez de la Luz.
S.M.
M.B.A.
23
Priyono, Anjar. "A strategic operations framework for disassembly in remanufacturing". Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26024.
Testo completoAbstract (sommario):
Previous studies into the field of disassembly have widely focused on both product attributes. These attributes include the number of components, product structure, type of materials and other geometrical information. From a management perspective, disassembly that focuses on these attributes is categorised as operational issues, which deal with day-to-day decisions. On the other hand, organisational characteristics and process choices, which are strategic in nature, have generally been overlooked by previous investigations. Some studies have attempted to include such variables in their analysis, but these studies were not comprehensive. This research therefore endeavours to address this oversight by investigating disassembly from an integrative perspective that incorporates organisational characteristics, process choices and product attributes. This inductive study features five remanufacturing companies as case studies in order to develop a comprehensive framework of disassembly strategies. The selection of the companies was not random, but rather took into consideration their potential for providing theoretical insights. The study starts by outlining a new process model of disassembly for remanufacturing, followed by a comprehensive identification of factors affecting disassembly. It incorporates organisational characteristics, process choices and product attributes. The five companies are then grouped into four quadrants, according to these factors, and the strategies within each group are analysed in order to develop the framework of the disassembly strategies, which is the main contribution of this study. The key findings of this research are: (1) remanufacturers in Quadrant I, which disassemble cores with low complexity and high stability supply, rely on disassembly resources flexibility; (2) remanufacturers located in Quadrant II, which disassemble cores with low product complexity and high stability supply, attempt to exploit the benefits of high volume of production; and (3) remanufacturers in Quadrant III, which disassemble complex cores in high stability supply, endeavour to maximise recovered value from the cores. No company was classified as belonging in Quadrant IV, which disassemble cores with high complexity but lack of stability. The generalisability of the framework has been confirmed by a panel of experts. The members of the expert panel are academia and practitioners that have an extensive knowledge in this field. This study could be criticised on the basis of its small sample size; however, the validity and reliability criteria are fulfilled to ensure that the results represent its objectivity.
24
Gunnebrink, Emma. "Remanufacturing towards a circular economy : the practitioners' perspective". Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-21997.
Testo completoAbstract (sommario):
The fashion industry has for several years been driven by fast cycles of cheap industrial mass production and unsustainable consumption. At the same time the burden on the environment has been significant. New business models to prevent the environmental impact have therefore been developed, and circular business models have gained interest. Remanufacturing as one of the central activities within circular business model is not a new concept for the fashion and apparel industry, but there is a lack of focus of how to prioritise and develop the concept. The focus of the study is to understand the relative importance of the challenges and the enabling conditions that influence the adoption of remanufacturing as transition towards a circular economy within the fashion and apparel industry. The purpose is also to show the practitioners’ perspective on a relatively new phenomenon within the fashion and apparel industry, which can clarify how to further prioritise and direct the development of the concept. Furthermore, it is also expected to identify and investigate what might be the main challenges and the enabling conditions within remanufacturing. This research is conducted through a mixed method with a deductive approach where knowledge about generic challenges and the enabling conditions within remanufacturing was collected from a systematic literature review, as a modification of a Delphi method. An utilisation of online questionnaires led to verify relative importance of challenges and the enabling conditions for an adoption of remanufacturing as a transition towards a circular economy within the fashion and apparel industry. The result from the online questionnaire was analysed through finding consensus among the collected data. The result shows that the most important perspective for an adoption of remanufacturing was related to business model-, costs- and consumer perspective. Specifically, the challenge with how to change the business model seemed to be essential, and the lack of financial benefits and influencing the consumer behaviour was received to be of great importance. Identified enablers were collaborations and communication. There was no agreement among the most important challenges and the enabling conditions. However, the operations- and core- perspective where considered important by many. Significant consensus was found between the practitioners and their opinion about what influences an adoption of remanufacturing as a transition towards a circular economy. The practitioners’ verification and opinions of challenges and the enabling conditions can serve as support for managers in an adoption of remanufacturing, and provide guidance regarding what is essential to consider for an transition towards a circular economy. This study highlights and identifies what motivates and makes the adoption of remanufacturing attractive, as a way to transition towards a circular economy, in particular it provides support and guidance regarding how strategies can be developed and where to focus further development.
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Hu, Peng. "Stochastic and multi-criteria optimization for remanufacturing industry". Electronic Thesis or Diss., université Paris-Saclay, 2023. https://www.biblio.univ-evry.fr/theses/2023/interne/2023UPASG070.pdf.
Testo completoAbstract (sommario):
Le désassemblage des produits en fin de vie (EOL) dans la remanufacturation a attiré une attention considérable ces dernières années en raison de ses avantages en matière d'économie de ressources non renouvelables, de protection de l'environnement et de promotion de la croissance économique. Dans la littérature existante, 1) la plupart des problèmes stochastiques d'équilibrage de la ligne de désassemblage supposent que les distributions de probabilité des paramètres incertains soient connues ; 2) la majorité des problèmes d'équilibrage de la ligne de désassemblage se concentrent sur un seul produit ; 3) peu de travaux portent sur les problèmes de conception de la chaîne logistique inversée (RSC) liés à l'équilibrage de la ligne de désassemblage. En réalité, plusieurs RSC liées au désassemblage de produits EOL existent dans les industries de la remanufacturation, telles que l'automobile, les téléphones mobiles, etc. Pour combler ces lacunes dans la littérature, trois nouveaux problèmes liés à l'équilibrage de la ligne de désassemblage sont étudiés dans cette thèse.Tout d'abord, une DLBP à produit unique avec des informations partielles sur les temps de traitement des tâches est étudiée, où seules la moyenne, la borne inférieure et la borne supérieure des temps de traitement des tâches sont connues. L'objectif est de minimiser le coût de désassemblage. Pour le problème étudié, un modèle conjoint à contraintes de probabilités est proposé. Ensuite, une nouvelle formulation sans distribution et une formulation basée sur une approximation de programme de cônes de second ordre sont construites en fonction des propriétés du problème. Les résultats expérimentaux sur 7 instances de référence et sur 81 instances générées aléatoirement montrent l'efficacité de l'approche proposée.Deuxièmement, une nouve DLBP stochastique multi-produits avec un temps de traitement de tâche incertain est abordée, où seules la moyenne, l'écart type et la limite supérieure des temps de tâche sont disponibles. L'objectif est de minimiser le coût de désassemblage. Pour le problème, un modèle conjoint à contraintes de probabilités est formulé. Ensuite, sur la base de l'analyse du problème, le modèle conjoint à contraintes de probabilités est approximativement transformé en un modèle sans distribution. Ensuite, plusieurs inégalités valides et une méthode exacte de coupe et de résolution sont conçues pour résoudre efficacement le problème. Les résultats des expériences sur un exemple illustratif et sur 490 instances générées aléatoirement démontrent les bonnes performances du modèle proposé, des inégalités valides et de la méthode de résolution.Enfin, un nouveau problème de conception de la RSC lié à l'équilibrage de la ligne de désassemblage multi-produits est étudié, où l'approvisionnement en produits EOL, la demande en composants et les temps de traitement des tâches sont supposés incertains. Les objectifs sont de maximiser le profit attendu et de minimiser simultanément les émissions de dioxyde de carbone. Pour le problème, un modèle bi-objectif de programmation stochastique à deux étapes et non linéaire est formulé, et approximativement transformé en un modèle sans distribution linéaire en fonction des propriétés du problème. Ensuite, une méthode basée sur des contraintes epsilon-construites est proposée, dans laquelle une décomposition de Benders améliorée est conçue pour résoudre les problèmes transformés à objectif unique. Des expériences numériques comprenant une étude de cas et sur 200 instances générées aléatoirement sont menées pour évaluer les performances des méthodes proposées. De plus, une analyse de sensibilité est réalisée pour tirer des enseignements en matière de gestionEnd-of-Life (EOL) products disassembly in remanufacturing has received extensive attention in recent years owing to their advantages in saving non-renewable resources, protecting the environment and promoting economic growth. In the existing literature, 1) most of stochastic disassembly line balancing problems assume that the probability distributions of uncertain parameters are known; 2) majority of disassembly line balancing problems focus on single product; 3) few works study the disassembly line balancing related reverse supply chain (RSC) design problems. In reality, multiple EOL products disassembly related RSC exist in remanufacturing industries, such as automobile, mobile phone, etc. To bring these research gaps, three new disassembly line balancing related problems are investigated in this thesis.Firstly, a single product disassembly line balancing problem (DLBP) with partial information of task processing times is studied, where only the mean, lower and upper bounds of task processing times are known. The objective is to minimize the disassembly cost. For the studied problem, a joint chance-constrained model is proposed. Then, a new distribution-free formulation and a second-order cone program approximation-based formulation are constructed based on problem properties. Experimental results on 7 benchmark instances and 81 randomly generated instances show the effectiveness and efficiency of the proposed approach.Secondly, a new stochastic multi-product DLBP with uncertain task processing time is addressed, where only the mean, standard deviation and upper bound of task times are available. The objective is to minimize the disassembly cost. For the problem, a joint chance-constrained model is formulated. Then, based on problem analysis, the joint chance-constrained model is approximately transformed into a distribution-free model. Subsequently, several valid inequalities and an exact lifted cut-and-solve method are designed to efficiently solve the problem. Experiments results on an illustrative example and 490 randomly generated instances demonstrate the good performances of the proposed model, valid inequalities and solution method.Finally, a novel multi-product disassembly line balancing related RSC design problem is investigated, where EOL products supply, components demand and task processing times are assumed to be uncertain. The objectives are to maximize the expected profit and minimize carbon dioxide emissions, simultaneously. For the problem, a bi-objective nonlinear two-stage stochastic programming model is formulated and approximately transformed to a linear distribution-free model based on problem properties. Then, an exact epsilon-constrained based method is proposed, in which an improved Benders decomposition is designed to solve the transformed single objective problems. Numerical experiments including one case study and 200 randomly generated instances are conducted to evaluate the performance of proposed methods. Moreover, sensitivity analysis is made to draw managerial insights
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Srinandphol, Niphon. "Performance measurement for reverse logistic processes (remanufacturing) : A review and future research needs". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-14821.
Testo completoAbstract (sommario):
Although the research in the field of the performance measurement system for remanufacturing activities is partial, an amount of literature and research has been performed regarding the performance measurement applicable for remanufacturing activities. The success of applying a performance measurement system on Remanufacturing relies on the relationship and inclusion of all perspectives; from customers to financial, as well as the remanufacturing process, and all challenges facing a remanufacturing process. Since the retrieval of used products is essential to the remanufacturers, the successful management of those specific processes contributes to an effective and efficient outcome of a Remanufacturing business’s performance outcome.
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Didriksson, Morgan. "ERP-systemens tillämpbarhet inom reparations- och livstidsförlängande verksamheter". Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44076.
Testo completoAbstract (sommario):
The EU strives for improving the use of resources in industry and society, a part of this is to turn the economy from a liner, consumption economy, to a circular, reusable economy. In order for this to be achieved industry needs adjust their production to facilitate remanufacturing of used products as well as producing new products. A part of the challenge industry is facing is the increase in complexity and volume in regard for information and material flows, one way of handling this in manufacturing companies is to use ERP- systems to keep track of information and material flows. The purpose of the thesis is to investigate the possibility to implement ERP- systems in remanufacturing industries since the amount of uncertainties and sources of variations shadows those in new product manufacturing. In order to reach a conclusion in regards to the purpose of this thesis three research questions where formed: What production steps are need to complete the remanufacturing process? What are the pros and cons of using ERP- systems within remanufacturing? What are the critical implementation factors that remanufacturing industries need to consider when implementing ERP- systems? In order to answer the research questions a literature study was performed to gain insight in the academic knowledge on the subject. In addition to the literature study a case study was conducted as well at a refurbishing company within the train industry. From the literature and case study it was concluded that the remanufacturing process consist of five phases, receiving the product from the market, dismantling it, repair and restore the components, reassemble the product, return the product to the customer/market. Since ERP- systems are continually being developed and their ability to handle uncertainties and variations improve, they could be used at companies facing increased variations and uncertainties than those found in companies only conducting new product production. The pros of utilizing ERP- systems are: financial gains through reduction of administrative, production and inventory costs, the customer related gains come from improved communication, the positive effects on the internal processes are achieved from increased productivity and efficiency. The final area where positive effects can be found is the knowledge and growth are, where ERP- systems follow up on best practises and makes the information easier to access. The drawbacks of using ERP- systems are that it is costly to purchase and implement them, and the company might need to adjust its methods and processes in order to fit the functions included in the ERP- system. As well as there is a need to educate and train the staff to handle the system in a correct fashion. In order to succeed in implementing a ERP- system, there is a great need for a vision of what the system is supposed to achieve as well as a clear support from the leadership. The implementation needs an assign leader that makes sure that the right functions and systems are being introduced and the amount of special adjustments are kept to a minimum to reduce the risk of making the implementation slower and costlier. In conclusion, remanufacturing companies could draw great advantage from implementing a ERP- system, if not only for the standardisation of methods and tasks, but also from the more user friendly information system.Ibland annat EU driver man ett arbete med att bli bättre på att ta tillvara på de resurser och tillgångar som vi har, en del av detta arbete är att företag ska kunna ta emot använda produkter och återvinna materialen och komponenterna för att producera nya produkter, man vill ställa om från en linjär till en cirkulär ekonomi. Denna omställning är en utmaning för nytillverkande företag då dessa har optimerat sin verksamhet för att producera produkter och saknar därför system för att ta emot använda produkter och demonteras dessa. En del i utmaningen är den ökade komplexitet som uppstår vid introduktionen av fler flöden och behovet av ytterligare processer. För att hantera information och materialflöden använder sig företag av integrerade affärssystem, ERP-system, där information centraliseras i företaget och görs tillgängligt för alla funktioner. Följande arbete har fokuserat på att utröna huruvida företag som är aktiva inom reparations- och livstidsförlängande verksamhet kan dra nyttan av att använda ERP-system då dessa typer av verksamheter har stora variationer i processtid, tillgång och kvalitet på returnerade produkter samt att efterfrågan varierar kraftigt. För att uppfylla syftet med arbetet har tre forskningsfrågor upprättats: Hur ser tillverkningsprocesser ut inom reparations- och livstidsförlängande verksamheter? Vilka är fördelar och nackdelar med användning av integrerade affärssystem till reparations- och livstidförlängande verksamheter? Vilka faktorer är viktigt att tänka vid implementeringen och användandet av integrerade affärssystem till reparations- och livstidförlängande verksamheter? För att besvara forskningsfrågorna har en litteraturstudie genomförts för att bestämma den akademiska kunskapen inom området, samt en fallstudie hos ett företag verksamt inom reparation och livstidsförlängande av tåg i syfte att samla in empirisk data. Från litteraturstudien och fallstudien har det konstaterats att tillverkningsprocessen hos reparations- och livstidsförlängande verksamheter består av fem moment; mottagande, demontering, upparbetning, återmontering och återlämning/försäljning. Då ERP-system blir allt mer avancerade har deras förmåga att hantera osäkerheter och förändringar ökat, detta har gjort att verksamheter med korta planeringshorisonter samt många osäkerhetskällor kan tillämpa ERP-system till sin verksamhet. Fördelar med att göra detta återfinns inom fyra kategorier: finansiella (så som reducerade kostnader för administration), produktion och lager, kundrelaterade fördelar (som förbättrad kommunikation och tidshållning), intern verksamhetsfördelar genom ökad produktivitet och effektivitet, kunskap och tillväxtfördelar så som användarvänligare system och ökad effektivitet samt att ERP- system följer upp ”best practis” mönster. Nackdelar med ERP-system är att dessa är kostsamma att införskaffa och implementera, samt att verksamheten kan behöva standardisera sina metoder för att vara kompatibla med systemets funktioner. Även kunskapen inom företaget behöver öka för att hantera systemen. För att lyckas med implementeringen av ERP-system krävs en tydlig vision om vad systemet ska uppnå och stötting i form av ledarskapsfördelning och implementeringsteam som driver på arbetet, samt att mängden specialanpassning hålls till ett minimum då detta riskerar att dra ut på processen vilket driver upp kostnaderna. Slutsatsen är att reparations- och livstidsförlängande verksamheter kan dra stora fördelar av att implementera ERP-system, bland annat genom standardisering av arbetssätt men också tack vare användarvänligare informationssystem. Dock behövs en tydlig vision för att användandet ska lyckas.
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Beck, James Michael. "Applying theory of constraints to an aircraft remanufacturing line". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA277987.
Testo completoAbstract (sommario):
Thesis (M.S. in Management) Naval Postgraduate School, December 1993.Thesis advisor(s): Shu S. Liao ; Martinus Sarigul-Klijn. "December 1993." Includes bibliographical references. Also available online.
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Li, Jie. "Retailer-driven closed-loop supply chains with product remanufacturing". [Ames, Iowa : Iowa State University], 2006.
Cerca il testo completo
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Dixit, Swapnil B. "Product design : a conceptual development of product remanufacturing index". [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001825.
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Shah, Purvin. "Optimizing usage of recycled material in a remanufacturing environment". Full text available, 2005. http://images.lib.monash.edu.au/ts/theses/shah.pdf.
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Errington, Mark. "Business processes and strategic framework for inspection in remanufacturing". Thesis, University of Exeter, 2009. http://hdl.handle.net/10036/83380.
Testo completoAbstract (sommario):
A crucial stage of the remanufacturing process is the inspection procedure. Surveys carried out in the automotive remanufacturing sector show that the industry is concerned about its need for such a large amount of specialist skills. Despite this, there has been little research into what is actually involved in the inspection process and what different strategies are used in different companies carrying out remanufacturing operations. This thesis presents case based research that was carried out on the inspection procedures of sixteen companies. These included companies from all industries ranging from those in the automotive and defence industries, to those in consumer electronics and IT. The cases range from small companies remanufacturing a few units per month to those with established remanufacturing production lines. This project has created two key contributions to theory. The first is a theory for remanufacturing strategy. A framework for remanufacturing strategy has been produced showing how different strategies are used to remanufacture items with different characteristics. The second is a generic inspection process which breaks down each inspection procedure within remanufacturing to its main objectives and methods. These, practical and applicable, contributions are of vital interest to researchers who can use them to enhance their knowledge of inspection procedures within remanufacturing and will act as a road map for future research into this new and exciting area.
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Khalifa, Sajid. "Implementing flow processing with product end of life remanufacturing". Thesis, De Montfort University, 2013. http://hdl.handle.net/2086/9503.
Testo completoAbstract (sommario):
This research focuses on improving the remanufacturing process efficiency by estimating the workstation utilization through identifying percentage of %Blocking and %Waiting on individual workstations within a remanufacturing flow line. It attempts to achieve this aim such that improved use of methods to overcome the effect of variability can be employed. Extensive literature review revealed the requirement of strategies to recover End of Life products due to the introduction and implementation of legislative directives demanding manufacturers to recover the End of Life resources. Upon analyzing the range of product recovery strategies, End of Life product remanufacturing has emerged as an appropriate and suitable strategy to be used since it extends the operational life of existing products without the need for the new resources required when making products. Remanufacturing is a process in which a product is disassembled to component level. Each of the components will be thoroughly examined for defects. Upon identifying defects, they will either be repaired or components will be replaced. This process in turn increases the product life span. However, remanufacturing is not widely used process applied into various industry sectors due to the fact that it is labour intensive and expensive process compared to new products. Although remanufacturing process is in infancy where small number of industry such as Automotive and Aerospace are deriving benefit from it by making effective use of remanufacturing. Ideally, the suitable manufacturing methods i.e. flow processing system, should be used to remanufacture products. However when flow processing is deployed, it is found that there are a number of factors affecting the process that if not tackled, will result in poor performance and poor efficiency of the overall remanufacturing system. This inefficiency is primarily due to the number of sources of variation found in terms of supply, product design, parts specification, operation and demand variability. Further investigation led to the characterizing the remanufacturing variability and identified ways the effect of this variability can be removed or reduced using Lean principles e.g. Single Minute Exchange of Dies and use of an appropriate manufacturing system. Based on the information revised in literature and experimental design, novel equations were developed along with a set of rules that accurately measures the workstation utilization in terms of %Blocking and %Waiting on individual workstation.
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Rafiei, Rezvan. "Production planning mechanisms in demand-driven wood remanufacturing industry". Doctoral thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25316.
Testo completoAbstract (sommario):
L'objectif principal de cette thèse est d'étudier le problème de planification de la production dans le contexte d'une demande incertaine, d’un niveau de service variable et d’approvisionnements incontrôlables dans une usine de seconde transformation du bois. Les activités de planification et de contrôle de production sont des tâches intrinsèquement complexes et difficiles pour les entreprises de seconde transformation du bois. La complexité vient de certaines caractéristiques intrinsèques de cette industrie, comme la co-production, les procédés alternatifs divergents, les systèmes de production sur commande (make-to-order), des temps de setup variables et une offre incontrôlable. La première partie de cette thèse propose une plate-forme d'optimisation/simulation permettant de prendre des décisions concernant le choix d'une politique de planification de la production, pour traiter rapidement les demandes incertaines, tout en tenant compte des caractéristiques complexes de l'industrie de la seconde transformation du bois. À cet effet, une stratégie de re-planification périodique basée sur un horizon roulant est utilisée et validée par un modèle de simulation utilisant des données réelles provenant d'un partenaire industriel. Dans la deuxième partie de cette thèse, une méthode de gestion des stocks de sécurité dynamique est proposée afin de mieux gérer le niveau de service, qui est contraint par une capacité de production limitée et à la complexité de la gestion des temps de mise en course. Nous avons ainsi développé une approche de re-planification périodique à deux phases, dans laquelle des capacités non-utilisées (dans la première phase) sont attribuées (dans la seconde phase) afin de produire certains produits jugés importants, augmentant ainsi la capacité du système à atteindre le niveau de stock de sécurité. Enfin, dans la troisième partie de la thèse, nous étudions l’impact d’un approvisionnement incontrôlable sur la planification de la production. Différents scénarios d'approvisionnement servent à identifier les seuils critiques dans les variations de l’offre. Le cadre proposé permet aux gestionnaires de comprendre l'impact de politiques d'approvisionnement proposées pour faire face aux incertitudes. Les résultats obtenus à travers les études de cas considérés montrent que les nouvelles approches proposées dans cette thèse constituent des outils pratiques et efficaces pour la planification de production du bois.The main objective of this thesis is to investigate the production planning problem in the context of uncertain demand, variable service level, and uncontrollable supply in a wood remanufacturing mill. Production planning and control activities are complex and represent difficult tasks for wood remanufacturers. The complexity comes from inherent characteristics of the industry such as divergent co-production, alternative processes, make-to-order, short customer lead times, variable setup time, and uncontrollable supply. The first part of this thesis proposes an optimization/simulation platform to make decisions about the selection of a production planning policy to deal swiftly with uncertain demands, under the complex characteristics of the wood remanufacturing industry. For this purpose, a periodic re-planning strategy based on a rolling horizon was used and validated through a simulation model using real data from an industrial partner. The computational results highlighted the significance of using the re-planning model as a practical tool for production planning under unstable demands. In the second part, a dynamic safety stock method was proposed to better manage service level, which was threatened by issues related to limited production capacity and the complexity of setup time. We developed a two-phase periodic re-planning approach whereby idle capacities were allocated to produce more important products thus increasing the realization of safety stock level. Numerical results indicated that the solution of the two-phase method was superior to the initial method in terms of backorder level as well as inventory level. Finally, we studied the impact of uncontrollable supply on demand-driven wood remanufacturing production planning through an optimization and simulation framework. Different supply scenarios were used to identify the safety threshold of supply changes. The proposed framework provided managers with a novel advanced planning approach that allowed understanding the impact of supply policies to deal with uncertainties. In general, the wood products industry offers a rich environment for dealing with uncertainties for which the literature fails to provide efficient solutions. Regarding the results that were obtained through the case studies, we believe that approaches proposed in this thesis can be considered as novel and practical tools for wood remanufacturing production planning.
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Hervás, Gutiérrez María, e García Elisa Sáez. "Design of instructions for a remanufacturing operation using AR". Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-20184.
Testo completoAbstract (sommario):
The concept of sustainability is gaining visibility in recent years. Both society and companies are increasing their interest in every of its social, environmental, and economic dimensions. This interest is one of the reasons why the Circular Economy is escalating. One of the goals of this model of production and consumption is waste reduction through the creation of a closed-loop chain, where remanufacturing has a crucial role. Despite the benefits of remanufacturing, this process increases the complexity of the task, limiting access to this job due to the high level of knowledge required. This is the reason why Augmented Reality is presented in this thesis as a method to assist operators by guiding them and providing real-time feedback interactively. The main goal is to increase the efficiency, effectiveness, and accessibility of this task. At the same time, this project aims to contribute to all dimensions of sustainability to a greater or lesser extent. To meet the objectives mentioned above, and keeping in mind the Design Science Research Methodology (DSRM), an artifact is created. The case of study is an assembly operation reproduced in the IRMA-demonstrator in ASSAR Innovation Arena in Skövde (Sweden). A set of Augmented Reality instructions have been designed to guide the operator through the assembly task. First, with the help of the software provided by Microsoft, Dynamics 365 Guides, and afterward, by using Unity. The software is compared, and an attempt is made to justify the implementation of AR, specifically in the remanufacturing assembly task. The results seem to point to a reduction of errors in the operation. Finally, conclusions are extracted based on previous studies and the analysis of the design and implementation of the set of instructions.Det finns övrigt digitalt material (t.ex. film-, bild- eller ljudfiler) eller modeller/artefakter tillhörande examensarbetet som ska skickas till arkivet.
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McIntosh, Mark William. "Modeling the value of remanufacture in an integrated manufacturing-remanufacturing organization". Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16001.
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Yuen, Wai-on, e 袁偉安. "Models and numerical algorithms for re-manufacturing systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30292931.
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Wei, Shuoguo. "Core Acquisition Management in Remanufacturing : Current Status and Modeling Techniques". Doctoral thesis, Linköpings universitet, Produktionsekonomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-113251.
Testo completoAbstract (sommario):
Remanufacturing is an important product recovery option that benefits our sustainable development. Cores, i.e. the used products/parts, are essential resources for remanufacturing. Without cores, there will not be any remanufactured products. Challenges in the core acquisition process are mainly caused by the uncertainties of: return volume, timing and core quality. Core Acquisition Management actively attempts to reduce these uncertainties and achieve a better balance of demand and return for the remanufacturers. The aim of this dissertation is to extend the knowledge of Core Acquisition Management in remanufacturing, by investigating the current status of research and industrial practice, and developing quantitative models that assist the decision making in the core acquisition process. In the dissertation, a literature review is firstly conducted to provide an overview about the current research in Core Acquisition Management. Possible further research interests, for example, more studies based on non-hybrid remanufacturing systems and imperfect substitution assumption are suggested. Through an industrial survey carried out in a fast developing remanufacturing market - China, environmental responsibility and ethical concerns, customer orientation and strategic advantage are identified as the most important motives for the remanufacturers, while customer recognition is their most serious barrier at present. Suggestions for further improving the Chinese remanufacturing industry from the policy-makers’ perspective are provided. After the above investigation, mathematical models are then developed to assist the acquisition decisions in two aspects: to deal with the uncertainties of return volume and timing, and to deal with the uncertainties of core quality. Acquisition decision about volume and timing is firstly studied from a product life cycle perspective, where the demands for remanufactured products and the core availability change over time. According to industrial observations, the remanufacturing cost decreases with respect to its core inventory. Using optimal control theory, core acquisition and remanufacturing decisions are derived to maximize the remanufacturer's profit. It is found that besides a simple bang-bang type control policy (either collecting as much as possible, or nothing), a special form of synchronizing policy (adjusting the core collection rate with demand rate) also exists. Furthermore, the acquisition decision depends greatly on the valuation of cores, and Real Option Valuation approaches are later used to capture the value of flexibility provided by owning cores when different aspects of remanufacturing environment are random. More specifically, the value of disposing a core earlier is investigated when the price of remanufactured product is uncertain, and the impact of the correlation between stochastic demand and return is also studied. To deal with the uncertainties of core quality, refund policies with different numbers of quality classes are studied. Under the assumption of uniformly distributed quality, analytical solutions for these refund policies are derived. Numerical examples indicate that the customers’ valuation of cores is an important factor influencing the return rates and the remanufacturer’s profit. Refund policies with a small number of quality classes could already bring major advantages. Credit refund policies (without deposits) are included for comparisons. In addition, within a game theory framework, the trade-off of two types of errors of the quality inspection in a deposit-refund policy is studied. The salvage values of different cores show great influences on the remanufacturer’s policy choices. The value of information transparency about the inspection errors are studied under different conditions. Interestingly, the customer may actually return more low quality cores when the inspection accuracy is improved.
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Ijomah, Winifred Louissa. "A model-based definition of the generic remanufacturing business process". Thesis, University of Plymouth, 2002. http://hdl.handle.net/10026.1/2829.
Testo completoAbstract (sommario):
Remanufacturing is a process of bringing used products to a "like-new" functional state by rebuilding and replacing their component parts. The practice has a low profile in world economies, however, studies indicate that it obtains cost savings in the region of 20% to 80%, as well as quality similar to that of an equivalent "new" product. In fact, in excess of 73,000 firms are engaged in some sort of remanufacturing in the United States alone. The key remanufacturing issues are the ambiguity in its definition and the scarcity of its analytic models. The objective of the research was to address these issues, and was achieved using a 3-Phase research approach that followed Eisenhardt's (1989) case study methodology. Initially, the research examined remanufacturing operations in order to unambiguously define it. Following this, the remanufacturing business process was modelled to define remanufacturing in the context of its total system. The research contributions are a robust definition of remanufacturing and a comprehensive generic model of the remanufacturing business process. The research beneficiaries are industry and academia, because the unambiguous definition permits remanufacturing to be differentiated from alternative secondary market operations for the first time. This assists researchers to explicitly understand remanufacturing so they can undertake effective remanufacturing research and correctly disseminate their findings. The generic model is a remanufacturing-specific, analytic error-reduction tool to reduce risk in remanufacturing. The research originality is that for the first time remanufacturing has been analysed from a business process perspective, an unambiguous definition of remanufacturing is determined and a generic model of the remanufacturing business process has been established.
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Robertson, Graeme. "REMANUFACTURING IN WIND POWER: A MULTI CRITERIA DECISION ANALYSIS APPROACH". Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-418585.
Testo completoAbstract (sommario):
Due to the rapid growth of the wind energy market over the last decade, the future of the industry will consequently see the dismantling of many wind turbines, both due to wind turbines reaching the end of their service life and to make way for surpassing technology, leaving behind a large amount of material that must be dealt with. Furthermore, due to the advancing technology of wind turbines, there has been a decline in the number of medium sized wind turbines being manufactured. This study aims to address the problem of future waste mitigation, whilst attempting to capture the medium scale market. As such, the study has looked at the idea of transitioning towards a circular economy, in which wind turbines are not considered as waste at the end of their service life, but rather an opportunity to recapture value through remanufacturing. This was approached by identifying the driver and barriers of remanufactured products, utilising knowledge from other industries with developed remanufacturing sectors. A Multi-Criteria Decision Analysis (MCDA) has been performed using the PROMETHEE II method with the objective of drawing a comparison of three scenarios, enveloped by a theoretical wind turbine selection project. The scenarios were created by the author and considered the implementation of a new wind turbine and remanufactured wind turbines. Upon examining the results of the multi criteria decision analysis, it was seen that the benefits of implementing remanufactured turbines were preferred by the majority of the stakeholders involved.
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Govetto, Sophie. "Determining the environmnetal impact of disposal, recycling and remanufacturing strategies". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/22714.
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Ismail, Nurul Hanna. "2-DFR : un cadre conceptuel destiné aux concepteurs pour un remanufacturing durable". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI063/document.
Testo completoAbstract (sommario):
Le remanufacturing est considéré comme une des stratégies clés pour le développement durable des produits industriels. Le but du remanufacturing est de récupérer la valeur du produit lorsque celui-ci ne répond plus aux besoins des utilisateurs. Ce processus complexe, qui comporte de nombreuses incertitudes, nécessite d’être pris en compte au tout début de la phase de conception pour que le produit remanufacturé soit adapté aux processus et aux futurs systèmes de remanufacturing.Un autre aspect essentiel pour aboutir à un remanufacturing durable est de bien planifier et coordonner sur le long terme, le système global de remanufacturing. La présence de nombreux outils et de méthodes académiques pour faciliter les processus de remanufacturing pourrait permettre de surmonter les défis posés et d’améliorer les qualités et quantités des produits intégrant le processus de remanufacturing. Malheureusement, ces outils et méthodes sont rarement utilisés par les acteurs du domaine de remanufacturing, probablement à cause du manque de plateformes pour faciliter leurs usages.L'objectif de cette thèse est donc d’aider les concepteurs et les fabricants à:1. Caractériser les produits et les processus remanufacturés, en lien avec le développement durable2. Classifier et aider au choix des outils ou des méthodes de remanufacturing pour améliorer le remanufacturing durablePour atteindre ces objectifs, un cadre à deux Dimensions (a Two Dimensional Framework for Remanufacturing - 2DFR), est proposé. Il combine les perspectives liées au développement durable et celles liées au système de remanufacturing. Une liste des contraintes liées au remanufacturing est ainsi proposée dans la première partie de la thèse selon ces deux perspectives. Elle a été validée comme un guide de conception pour le remanufacturing lors d’un atelier dans le cadre du projet européen ERN (H2020). Le 2DFR est ensuite utilisé dans la deuxième partie de la thèse pour développer la classification des outils et des méthodes de remanufacturing. Enfin, une méthode pour guider l’utilisateur dans le choix des outils et méthodes de remanufacturing est proposée. Elle est créée à partir de la liste des caractéristiques du remanufacturing apparues dans la première proposition et de la méthode de classification mentionnée précédemment. Un démonstrateur qui fonctionne comme une interface pour les deux méthodes de classification et de choix des outils est développée. Des études de cas permettent d’illustrer son utilisation.Les caractéristiques pour des produits et processus de remanufacturing durables définies dans la première proposition offrent ainsi aux utilisateurs un guide complet lors de la conception et de la prise de décisions. La deuxième proposition, quant à elle, encourage l'utilisation par l'industrie des outils et méthodes académiques existants liés au remanufacturingRemanufacturing is believed to be among the key strategies for sustainable development of industrial products. The aim of remanufacturing is to retrieve the product’s inherent value when it no longer fulfils the user’s needs. However, it is a non-linear process that poses many uncertainties. Therefore, integrating remanufacturing concerns during the early design phase is necessary to adapt products to the future remanufacturing processes and to the future remanufacturing system.Another crucial aspect in achievingsustainable remanufacturing activity is to plan and coordinate remanufacturing system in a sustainable way. The presence of various academic tools and methods to facilitate remanufacturing activities might overcome the challenges observed and enhance both the quality and quantity. Unfortunately, these tools/methods are rarely used by remanufacturing stakeholders, probably due to the lack of platform for them to facilitate the usage.The objective of this dissertation is to help the designers and remanufacturers to:• Characterize remanufactured products and processes in relation to sustainable development,• Classify and choose remanufacturing tools ormethods to improve sustainable remanufacturing.To achieve these objectives, a Two Dimensional Framework for Remanufacturing (2DFR) is proposed. It combines the sustainable development and remanufacturing system perspectives. A list of remanufacturing constraints from both perspectives is proposed in the first part of this dissertation. It was validated as a design for remanufacturing guideline during a remanufacturing workshop event in the framework of the European project ERN (H2020). The 2DFR is used again in the second part of this dissertation to develop a method to classify remanufacturing tools/methods. A method to guide and facilitate user in choosing remanufacturing tools/methods is proposed using the list of remanufacturing characteristics listed in the first proposition and the previous classification method. A configurator that functions as an interface for both the classification method and the choosing method is developed. Illustrated case studies are presented to validate its usage.The characteristics of sustainable remanufacturing products and processes defined in the first proposition offer to the users a comprehensive checklist when designing and making decisions. Meanwhile the second proposition encourages the usage by the industry of the existing academics tools/methods related to remanufacturing
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Benedito, Ernest. "Influence of reverse logistics on optimal manufacturing, remanufacturing, and storage capacities". Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/52089.
Testo completoAbstract (sommario):
El propósito de la presente tesis es estudiar la influencia de la logística inversa en las capacidades de fabricación, refabricación y almacenaje óptimas de un sistema industrial.
El interés por la logística inversa ha crecido en los últimos años de forma paralela a la preocupación, creciente también, por las cuestiones medioambientales en el mundo industrializado. En el capítulo 2 se hace una introducción a la logística inversa, explicando su definición y los motivos por los que se ha creado esta área de gestión diferenciada de la logística tradicional; se describen los tipos de productos que intervienen en la logística inversa y los distintos procesos para recuperar su valor. Además, se analizan las características del comportamiento de un sistema con logística inversa, comparándolas con las de un sistema tradicional.
En el capítulo 3 se revisa la literatura tanto en el ámbito de la gestión de las capacidades de fabricación y almacenaje en un sistema tradicional como en el ámbito de la logística inversa.
Para cumplir con el objetivo de la tesis, en los capítulos 4, 5 y 6 se estudian tres modelos de un sistema en que el producto recuperado es indistinguible del producto nuevo. El proceso seguido para realizar el estudio ha sido el mismo en cada uno de los modelos presentados: en primer lugar se ha determinado la política de producción óptima utilizando una cierta función de coste y suponiendo que tenemos dadas unas capacidades fijas, en segundo lugar se ha determinado el valor óptimo de las capacidades que optimizan la función de coste y en tercer lugar se estudian las variaciones de las cantidades óptimas al variar algunos parámetros relacionados con la logística inversa.
En el capítulo 4 se pone de manifiesto cómo influye la aleatoriedad de los retornos en las capacidades óptimas estudiando un sistema con demanda uniforme y retornos aleatorios. La función de coste a optimizar es el valor esperado del coste en un periodo.
En el capítulo 5 se estudia un modelo en el que la demanda y los retornos son funciones conocidas, continuas y periódicas. La función de coste a optimizar es el coste incurrido en el periodo y el problema de determinar la política de fabricación óptima es un problema de control óptimo. El modelo presentado permite analizar la variación en las capacidades óptimas al variar el plazo entre la venta y los retornos de los productos.
En el capítulo 6 se trata un modelo con demanda y retornos aleatorios. La función de coste a optimizar es el valor esperado del coste en un periodo. Para realizar el cálculo de las políticas óptimas se hace la hipótesis de independencia estocástica de los retornos, comúnmente utilizada en la literatura. Una vez calculadas las capacidades óptimas se contrasta la validez de la hipótesis mediante simulación. El modelo se utiliza para estudiar la dependencia de las capacidades respecto de la probabilidad de que el producto sea retornado y respecto de los costes variables de refabricación.
Finalmente en el capítulo 7 se recogen las conclusiones y los futuros temas de investigación.The purpose of this thesis is to study the influence of reverse logistics in optimal manufacturing, remanufacturing and storage capacities of an industrial system. The interest in reverse logistics has grown in recent years in parallel with the increasing concern about environmental issues in the industrialized world. In chapter 2, we provide an introduction to reverse logistics: explaining the definition of reverse logistics and the reasons for which has been created as a differentiated area of management of traditional logistics, describing the types of products involved in reverse logistics and the different processes to recover its value, and examining the behavioral characteristics of a reverse logistics systems, compared with the traditional logistics system. In chapter 3 we review the literature both in the field of capacity management in traditional systems and in the field of reverse logistics. To meet the objective of the thesis, we study three models of a system in which the recovered product is indistinguishable from the new product. The process followed for the study was the same in each of the models presented: firstly, we determine the optimal production policy for every value of capacities; the second step is determining the optimal value of the capacities when optimal policies are applied and third we study the dependency of optimal capacities on some parameters related with reverse logistics. In chapter 4 we study a system with uniform demand and random returns to show the influence of the randomness of returns in the optimal capacities. The cost function to optimize is the expected value of cost in a period. In chapter 5 we study a model in which demand and returns are known functions, continuous and periodic. The cost function to optimize is the cost incurred in the period and the problem of determining the optimal production policy is an optimal control problem. Using this model, we analyze the dependence of optimal capacity on the time between sales and product returns. In chapter 6 we present a stochastic model where demand and returns are sequences of random variables. The cost function to optimize is the expected value of cost in a period. To perform the calculation of optimal policies we assume that returns are stochastically independent of demand (this assumption is commonly used in the literature). The hypothesis is validated by simulation after optimal capacity is calculated. The model is used to study the dependence of the optimal capacities on the probability that the product is returned and also on the variable costs of remanufacturing. Finally in chapter 7 we discuss the conclusions and future research topics.
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Chen, Changrong. "Fatigue life assessment of thermal cracked dies and moulds for remanufacturing". Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/31389/.
Testo completoAbstract (sommario):
The conventional life cycle of dies and moulds is not eco-efficient, which shows great potential for the application of remanufacturing. It is of great importance to establish life evaluation technology for remanufacturers to predict the remaining service life of dies and moulds. The main contribution of this thesis is the development of key technologies for life evaluation of dies and moulds after remanufacturing through a thorough review of remanufacture related activities within the die and mould industry. It is proposed that evaluation of remaining service life of dies and moulds after remanufacturing is carried out using finite element modelling. It involves determination of residual stresses induced by repair welding, working conditions for the future operation and life model of die material. Specifically, the thesis is firstly focused on the design of representative die geometry. The geometry is optimized based on the effect of thermal loading and the effect of residual stress due to laser welding. Secondly, fatigue life model was established by conducting thermal fatigue tests and finite element modelling as well. Induction heating based test method was adopted for its capacity of achieving similar thermal shock effects. An energy based life model was derived by taking into account test period. The laser weld characteristics were studied using a sequential experimental design combining orthogonal method and uniform design. Radial Basis Function neutral networks were used to obtain regression models of weld performances for enabling process optimization. Heat source models were also calibrated by achieving sufficient agreement between numerical and experimental weld profiles. Lastly, the effect of residual stress on the fatigue life model was identified and the life model was updated. With close agreement between corresponding coefficients from two curve fittings, the corrected model is proved to be reliable for evaluating remaining useful life of remanufactured dies/moulds.
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Williams, Joy-Therése. "Quantification and analysis of remanufacturing waste streams for improving product design". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58844.pdf.
Testo completo
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Stölting, Wiebke. "Lebenszyklusorientierte strategische Planung von Remanufacturing-Systemen für elektr(on)ische Investitionsgüter /". Düsseldorf : VDI-Verl, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016323554&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Testo completo
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Seitz, Margarete Anna. "Closed-loop supply chain management and remanufacturing in the automotive sector". Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/55426/.
Testo completoAbstract (sommario):
The results of this research make three distinct contributions. The first contribution refers to the immediate body of knowledge on closed-loop supply chain management. The thesis reviews existing closed-loop supply chain and remanufacturing structures and creates, through the application of the research findings, new and more appropriate structures for the automotive sector. Secondly, the findings contribute to the development of a theory for closed-loop supply chain management. They demonstrate that theories from related fields cannot sufficiently explain why corporations engage in product recovery activities. This thesis therefore develops a rational for closed-loop supply chain management and remanufacturing in the automotive sector. The third contribution is made with regard to methodology. Research in closed-loop supply chain management has been largely dominated by quantitative contributions. This thesis therefore adds to methodology by taking an interdisciplinary perspective and by applying a unique combination of methodological considerations to investigate the specific research problem.
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Lindkvist, Louise. "Exploring Product Life-Cycle Information Flows with a Focus on Remanufacturing". Licentiate thesis, Linköpings universitet, Industriell Produktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-107496.
Testo completoAbstract (sommario):
Our daily lives and welfare rely heavily on products. Considering that climate change is caused by humans, it is important to handle and use products in a sustainable manner; remanufacturing is one such way to accomplish this. Remanufacturing is an industrial process where products are restored into useful life. However, few products are designed for remanufacturing, which sometimes makes remanufacturing impossible or difficult to perform. Traditionally, the design focus has been on the manufacturing and use phases. The product life-cycle perspective, however, is required to obtain a more sustainable product life-cycle. As the remanufacturing process is characterised by process steps such as inspection, disassembly, cleaning and reprocessing, the often labour-intensive remanufacturing process has specific requirements on the design. Further, the remanufacturing process is characterised by uncertainties such as when used products are expected and what state they will be in when they arrive. Information from the product life-cycle such as drawings and service reports could potentially facilitate the remanufacturing process. Further, feedback from remanufacturing to product design could improve the design of the next generation of products. The objective of this thesis is to identify and analyse product life-cycle information flows with a particular focus on remanufacturing. The design research methodology framework has been used to outline, plan and support the research. Previous research in the area has been assessed through a literature study, while the case study methodology was applied for carrying out the empirical studies. The data collection methods used in the case studies were semi-structured interviews, workshops and document analysis. The result from the literature study shows that feedback such as suggestions for improvement from remanufacturing personnel, process data, and data about wear on components could help to improve the design of the next generation of products. Further, design changes could lead to a more efficient remanufacturing process. The three industrial cases presented in this licentiate thesis fail to explore the full potential of remanufacturing feedback to product design. All in all, remanufacturing is sufficiently included in the information flows of the product life-cycle. Design for remanufacturing is not applied in any of the industrial cases studied.
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Padakala, Bhavana. "Inventory management in a manufacturing/remanufacturing hybrid system with condition monitoring". [Ames, Iowa : Iowa State University], 2008.
Cerca il testo completo
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Kurilova-Pališaitienė, Jelena. "Toward Lean Remanufacturing : Challenges and Improvements in Material and Information Flows". Licentiate thesis, Linköpings universitet, Industriell Produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118280.
Testo completoAbstract (sommario):
Remanufacturing is an environmentally sound material recovery option which is essential to compete for sustainable manufacturing. The aim with remanufacturing at a majority of companies is to prolong physical product performance by delivering the same or betterthan-original product quality. In general, remanufacturing is an industrial process that brings used products back to useful life by requiring less effort than is demanded by the initial production process. Consequently, from a product life-cycle perspective, remanufacturing generates great product value. Remanufacturers lag behind manufacturers since they often face complex and unpredictable material and information flows. Based on a review of remanufacturing research, remanufacturing challenges in material and information flows can be classified into three groups: insufficient product quality, long and unstable process lead times, and an unpredictable level of inventory. While some remanufacturing researchers state that manufacturing and remanufacturing are significantly different, they have more in common than many other processes operations. Therefore, to sustain competitive remanufacturing, companies investigate an opportunity for improvement through the employment of lean production that generates significant benefits for manufacturers. In order to investigate the potential to address remanufacturing challenges by lean production, a Minimum time for material and information flow analysis (MiniMifa) method was developed. This method originates from the value stream mapping (VSM) method, broadly practiced to bring lean to manufacturing companies. The focus of MiniMifa was to collect empirical data on the identified groups of remanufacturing challenges from the remanufacturing perspective, and to provide a basis for the development of improvements originating from lean principles. Lean production was selected for this research due to its system perspective on material and information flows. Among the defined lean principles in remanufacturing, a pull principle was investigated at the case companies. The suggested principle demonstrated a reduction in lead time, followed by improvements in inventory level and product quality. However, in order to become lean, remanufacturers have to overcome three levels of lean remanufacturing challenges: external and internal challenges as well as lean wastes. Finally, this research reduces the gap between academia and industry by contributing with a possible solution to the identified remanufacturing challenges in material and information flows.