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Integrated Production Planning and Scheduling Using Backward/Forward Scheduling Simulation
Shinji Hirano,Shigeo Kobayashi,Toru Eguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper deals with release time planning to reduce lead times of jobs in make-to-order productionenvironments. In traditional MRP-based planningsystem, lead times are estimated using historical data and pastexperience without precisely considering capacity constraints.The proposed method in this paper is based on precisebackward and forward scheduling simulation. First, backward simulation in which simulation starts at each due date ofjob and sends it through the shop floor based on the backward sequence of its part routing is applied. Next, forwardsimulation is applied to modify the release times obtained by backward simulation. A genetic algorithm is also used tominimize lead times of jobs in the final step. Numerical experiments of planning and scheduling with processing timeuncertainty are carried out to examine the effectiveness of the proposed method.