Cycle-time simulation for a multiproduct manufacturing facility

Abstract

A b s t r a c t This is a g e n e r a l i z e d s i m u l a t i o n m o d e l for a m u l t i p r e d u c t m a n u f a c t u r i n g line with i n t e r d e p e n d e n t p r o d u c t i o n equipment. B a s e d on v a r i o u s p r o d u c t d e m a n d s , it s i m u l a t e s r e s o u r c e s such as m a n p o w e r and e q u i p m e n t and g e n e r a t e s p r o d u c t cycle time. It is a d e t e r m i n i s t i c model. It takes into c o n s i d e r a t i o n e q u i p m e n t r e l i a b i l i t y , m a n -m a c h i n e i n t e r a c t i o n s , yields, r e w o r k , and p r o c e s s -r e l a t e d c o n s t r a i n t s . The m o d e l could also be used to plan r e s o u r c e r e q u i r e m e n t s to fulfill r e q u i r e d p r o d u c t cycle t i m e s . The model is w r i t t e n in GPSS language with P L / 1 s u b r o u t i n e s . The t e m p t a t i o n to include r e l a t i v e l y l e s s p e r t i n e n t f a c t o r s is r e s i s t e d in o r d e r to keep the model e c o n o m i c a l .

Standards for computer aided manufacturing

“…21 Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. ANSI generally adopts in total those ISO standards it feels have merit.…”

“…21 and HDLC in the appropriate portion of the standard, and adds a set of packet formats and commands and responses for setting up "virtual calls" and transferring data through the network. Figure 8 shows the enveloping format prescribed by X.25 for the interchange of information between a host computer and a packet switched network A packet consists of data to be transferred between two users.…”