A Hybrid Hierarchical PPC System for Engineer-to-Order Enterprises
摘要
For Engineer-to-Order (ETO) enterprises, both the capacity-oriented hierarchical production planning and control (HPPC) in which all resources, critical or ordinary, have the same importance and the material- oriented Operational Plan/Material Requirements Planning (OP/MRP) in which plans'consistency at different stages is seldom considered in advance do not completely satisfy its needs for production planning and control. HHPPC (hybrid hierarchical PPC), which combines HPPC with OP/MRP, is presented in which plans at most neighboring stages coordinate by ex-ante feedbacks and critical resources are utilized prior to ordinary ones by OP/MRP mode. The optimization problems arising at the Master Production Scheduling (MPS), operational plan and the fine planning stages in HHPPC are all modeled as project scheduling problems.