Abstract
Critical WIP Loop II (CWIPL II) is a control mechanism previously proposed for unbalance flow line. The purpose of this paper is show how to apply CWIPL II in job shop and then comparing it with Theory of Constraint (TOC), Dedicated CONWIP (DCONWIP) and Shared CONWIP (SCONWIP). The Performance measures considered are average throughput, average lead time, average tardiness time and percent of tardy. Two set of examples are simulated. At First set, each job has a bottleneck that is not bottleneck for other jobs. Simulation results and statistical tests demonstrates that CWIPL II has better lead time and throughput compared to TOC and CWIPL II has better or the same due date compared to TOC. TOC works better than DCONWIP for all performance measures and DCONWIP is better than SCONWIP for average throughput lead time and tardiness time while DCONWIP and SCONWIP are the same for percent of tardy. At second set, single machine is bottleneck for all jobs. So the Job shop has one bottleneck. In this set, TOC has better lead time, tardiness and percent of tardy compared to CWIPLII, DCONWIP and SCONWIP with the same throughput.
Highlights
Increasing competitiveness in the global market has led firms to place greater emphasis on their performance
This study focuses on the previously proposed material flow control mechanism in flow shop named Critical WIP Loops (CWIPL) II and compares it with Constant Work in Process (CONWIP) and Theory of constraints (TOC)
It can be seen that TOC has better throughput than Dedicated CONWIP (DCONWIP) and DCONWIP has better throughput than Shared CONWIP (SCONWIP)
Summary
Increasing competitiveness in the global market has led firms to place greater emphasis on their performance. Because of MFC mechanism influences the performance measures of a manufacturing line, many MFC mechanisms have been developed. These are including Base Stock System (BSS), Material Requirements Planning (MRP), Line Requirements Planning (LRP) , Just in Time (JIT), Constant Work in Process (CONWIP), Optimized Production Technology (OPT), Workload Control (WC), Starvation Avoidance (SA), Queue Management Release Policy (QMRP), Load Oriented order release (LOOR), Theory of constraints (TOC), Waiting time heuristic , Decentralized WIP oriented (DEWIP), Gated MaxWIP, Critical WIP Loops (CWIPL), CWIPL II, Cobacabana and WIPLCtrl (Graves et al 1995, Graves and Milne 1997, Lodding et al 2003, Grosfeld Nir and Magazine 2002, Sepehri and Nahavandi 2007, Nahavandi 2009, Land 2009, Gonzalez-R et al 2011, Qi et al 2009). The literature review focuses on research related to that topic
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