Stochastische Bestandsdisposition in integrierten Produktions- und Recyclingsystemen

Abstract

Production planning and control becomes more challenging when regular production is combined with remanufacturing or rework activities within a company. An additional complicating factor is given by the high degree of uncertainty observed for return flows of both used products coming from outside customers and defective products occurring in inside manufacturing processes. The paper investigates how under these stochastic conditions, also including demand uncertainty, optimal inventory control can be performed in order to coordinate production and remanufacturing/rework decisions. For practical application a simple control rule is presented, and a sound procedure for calculating effective control parameters is developed, based on sophisticated heuristic considerations. It is shown how both the control rule and the determination of control parameters has to be adapted appropriately to the cases of remanufacturing external and reworking internal returns.