Browsing by Author "CHUNG, SH"

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THE DESIGN OF A CAPACITY REQUIREMENTS PLANNING SYSTEM FOR FLEXIBLE MANUFACTURING SYSTEMS
(1995-03-01)
CHUNG, SH
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交大名義發表
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工業工程與管理學系
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National Chiao Tung University
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Department of Industrial Engineering and Management
The operating and manufacturing characteristics of a flexible manufacturing system (FMS) mean that a traditional planning procedure of material requirements planning (MRP) and capacity requirements planning (CRP) cannot be followed. Thus the planning works between the master production schedule and the shop-floor control (SFC) systems are analysed and reassigned to the MRP, CRP and SFC systems. A CRP system designed for FMS is presented in this paper. It determines the requested capacities by carrying out part type selection, batch size determination and process plan selection, and by estimting tool slot requests. If there is insufficient capacity, the CRP system calculates the overtime hours required to complete the production of demand quantity for a specified part type.
USING THE VIRTUAL CELL CONCEPT FOR SHORT-TERM PRODUCTION PLANNING FOR FLEXIBLE JOB-SHOP MANUFACTURING SYSTEMS
(1993-07-01)
CHUNG, SH
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FANG, CY
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交大名義發表
;
工業工程與管理學系
;
National Chiao Tung University
Short-term production planning (STPP) problems in flexible job shop manufacturing systems (FJSMS), which consist of computerized numerically controlled (CNC) machines and dedicated machines, are discussed here. Short-term production planning problems of FJSMS include part type selection, process selection, batch sizing and part family/machine group formation. A proposed STPP system for FJSMS is developed for cases where production contents are frequently changed thus resulting in the physical machine layout being not justified. It mainly adopts a restricted-period planning approach, using a virtual cell's concept for solving the STPP problem. The planning goal of STPP is to satisfy quantity and due date requirements as determined by MRP/CRP, with due consideration to the features of NC machines and dedicated machines.