CAREER: Analytical Modeling for Demanufacturing Operations

9734310朱莉·安·斯图尔特本研究的重点是制定“产品回收中心”接收各种废弃产品的策略。为了提高产品回收中心的盈利能力和效率，将开发用于战略性生产计划决策和运营分组和调度决策的决策工具。回收生产计划模型的战略决策的目标将是减少分段库存和增加发货频率。将开发混合整数规划模型，以表示回收产品的线性数量和出境卡车发货量的整数数量。分组算法的目标将是将回收产品分配给加工组，以努力提高出站发货价值，同时考虑额外的库存和材料处理费用。需求制造的调度启发式方法的重点将是减少出货的周期时间。这些新决策工具的性能最初将使用模拟模型进行测试，因为进入的产品特性差别很大。此外，这些新模型将通过美国回收中心的案例研究进行验证。这项研究将有助于为需求制造计划和运营建模建立方法论基础。如果研究成功，本研究的结果将提高回收中心的盈利能力，从而可能导致产品回收加工的增加。产品回收加工的增加将分流许多吨来自垃圾填埋场的废弃产品，并增加用于新产品再利用的材料供应。提高外运材料质量和价值的分组策略也可能增加材料再利用的可能性。此外，将通过现有和新的大学课程、演讲、论文和研讨会的创新学习模块，向本科生和研究生、研究人员和实习工程师传达材料重复使用、面向需求制造的产品设计、需求制造规划和可持续性方面的挑战和方法。*

9734310 Julie Ann Stuart This research focuses on the development of strategies for "product take-back centers" receiving a variety of discarded products. To improve the profitability and efficiency of product take-back centers, decision tools will be developed for the strategic production planning decisions and for the operational grouping and scheduling decisions. The goal of the strategic decisions for take-back production planning models will be to reduce staging inventory and increase frequency of outgoing shipments. Mixed integer programming models will be developed to represent the linear quantities of take-back products and the integer quantities of outbound truckload shipments. The goal for the grouping algorithms will be to assign take-back products to processing groups in an effort to improve outbound shipment value while considering additional inventory and material handling expenses. The focus of the scheduling heuristics for demanufacturing will be to decrease the cycle time for outbound shipments. The performance of these new decisions tools will initially be tested using simulation models since incoming product characteristics vary considerably. In addition, these new models will be validated with case studies in U.S. take-back centers. This research will contribute to the establishment of a methodological foundation for demanufacturing planning and operations modeling. If successful, the results of this research will improve take-back center profitability that may lead to the increase of product take-back processing. The increase of product take-back processing will divert many tons of discarded products from landfills and increase the supply of materials for reuse in new products. Grouping strategies to improve the quality and value of outbound materials may also increase the possibilities for materials reuse. Furthermore, the challenges and approaches for materials reuse, product design for demanufacturing, demanufacturing planning, and sustainability will be communicated to undergraduate and graduate students, researchers, and practicing engineers through innovative learning modules for existing and new university courses, presentations, papers, and workshops.***