Contribution à l'optimisation des politiques de maintenance et l'analyse de risque dans la planification des opérations d’assemblage - désassemblage à deux niveaux

Abstract : The reality of the economic markets places constraints on manufacturing companies that are increasingly difficult to achieve, such as product diversification, quality improvement, cost reduction and fewer delays. These constraints are satisfied by a better organization of manufacturing systems using existing technical resources. Our thesis focuses on two major contributions, the first is to model different industrial systems (simple production system, assembly system, disassembly system) by integrating maintenance policies. The second contribution is based on risk assessment of profit loss following a decision taken after an optimization of an industrial system. Three different industrial problems are studied; the first concerns the development of risk assessment methods of profit loss resulting from the choice of an optimization algorithm to solve a problem of joint production and maintenance planning. To achieve our goals, we start by calculating production and maintenance plans using different optimization algorithms. In addition, we propose analytical models to quantify the risk of profit loss resulting from product returns and of repair times. This study provides information on the most effective optimization algorithms for the problems encountered to help and guide decision-makers in the analysis and evaluation of their decisions. The second problem concerns the optimization of two-level assembly system planning. A mathematical model is developed to incorporate supply planning for two-level assembly system with stochastic lead times and failures. The optimal maintenance planning obtained is used in the risk assessment to find the threshold repair period that reduces the profit loss. The third problem studied concerns the optimization of disassembly system of returned products (used or end of life products), remanufacturing and assembly of finished products taking into account the degradation of the production system. An analytical model is developed to consider disassembly, remanufacturing of returned products that contribute to the assembly of finished products. Indeed, the latter may consist of new or remanufactured components. A maintenance policy is sequentially integrated to reduce the unavailability of the system. The goal of this study is to help decision makers, under certain conditions, choose the most cost-effective process to satisfy the customer and who can also adapt to the potential risks that can disrupt the disassembly-remanufacturing-assembly system. The risk associated with system repair periods is discussed, which has an impact on managerial decision-making.
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https://hal.univ-lorraine.fr/tel-02110363
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Submitted on : Thursday, April 25, 2019 - 1:09:06 PM
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Zouhour Guiras. Contribution à l'optimisation des politiques de maintenance et l'analyse de risque dans la planification des opérations d’assemblage - désassemblage à deux niveaux. Recherche opérationnelle [cs.RO]. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0016⟩. ⟨tel-02110363⟩

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