Universitt at W Urzburg Institut F Ur Informatik Research Report Series Performance Modelling of Pull Manufacturing Systems with Batch Servers and Assembly{like Structure

The manufacturing industries need to focus on reducing work in process WIP as well as product cycle times has led to a widespread employment of the just in time JIT production philosophy and in particular kanban systems Queueing models of several di erent kanban systems have been previously presented focusing on single job ser vice machines We extend the model and approximation method presented by Mitra and Mitrani to investigate a singlecard kanban system with batch servers Batch servers are machines that can process several jobs or lots at a time We use the same technique to analyze assembly like manufacturing systems and manufacturing systems with more than only one machine in each kanban cell We compare numerical approximations with simulations of the con gurations under con sideration We also discuss how given parameters in uence performance measures such as production rate throughput cycle time and WIP This study was motivated by the need of semiconductor manufacturers for kanban like pull production control systems

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