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Modelisation et evaluation des performances d'un systeme hybride fabrication reutilisation en logistique inverse.

机译:逆向物流中混合复用制造系统的性能建模和评估。

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摘要

Our work is the study of stochastic optimal control problems involved in inventory management of manufacturing systems. In practice, these systems are often subject to random phenomena that result in significant effects on the evolution of their behaviour. We first consider, in the forward direction of logistic, a production system consisting of a machine producing a single product type. The machine has a finite capacity and is assumed reliable. We consider that the customer's demand can fluctuate over time. Subsequently, we will integrate, in the opposite direction of the basic production environment, reverse logistics to take into account the return of random products. In this case, the system consists of two reliable machines with a finite capacity and producing the same type of product.;The objective of this study is to determine optimum strategies for production planning in order to meet a stochastic demand of customer and manage inventory at lowest cost. A two-level hierarchical control model is developed by applying the stochastic optimal control theory based on Pontryagin's maximum principle. In the first level of the proposed hierarchy, a stochastic linear-quadratic optimal control problem is formulated to optimally determine the target values of the state and control variables. In the second level, a recursive optimization control problem (predictive control) is presented in order to minimize the square deviation from nominal trajectories (problem of trajectory tracking). The optimal solution is obtained numerically by the Euler-Maruyama scheme. Numerical examples and sensitivity analysis are presented to illustrate the effectiveness and quality of the proposed approach.
机译:我们的工作是研究制造系统的库存管理中涉及的随机最优控制问题。在实践中,这些系统经常受到随机现象的影响,从而对其行为的发展产生重大影响。我们首先考虑物流的前进方向,即由一台生产单一产品类型的机器组成的生产系统。机器的容量有限,并且被认为是可靠的。我们认为客户的需求会随着时间而波动。随后,我们将在基本生产环境的相反方向整合逆向物流,以考虑随机产品的退货。在这种情况下,系统由两台容量有限且生产相同类型产品的可靠机器组成。;本研究的目的是确定生产计划的最佳策略,以满足客户的随机需求并管理库存最低的成本。应用基于庞特里亚金极大值原理的随机最优控制理论,建立了两级分层控制模型。在提出的层次结构的第一级中,制定了一个随机线性-二次最优控制问题,以最优地确定状态和控制变量的目标值。在第二级中,提出了递归优化控制问题(预测控制),以最小化与标称轨迹的平方偏差(轨迹跟踪问题)。最优解是通过Euler-Maruyama方案数值获得的。数值算例和灵敏度分析表明了该方法的有效性和质量。

著录项

  • 作者

    Ouaret, Samir.;

  • 作者单位

    Ecole de Technologie Superieure (Canada).;

  • 授予单位 Ecole de Technologie Superieure (Canada).;
  • 学科 Engineering Industrial.;Operations Research.;Engineering System Science.
  • 学位 M.Eng.
  • 年度 2012
  • 页码 177 p.
  • 总页数 177
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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