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http://dx.doi.org/10.9709/JKSS.2012.21.4.011

Comparison of DBR with CONWIP in a Production Line with Constant Processing Times  

Lee, Hochang (경희대학교 경영대학 경영학부)
Seo, Dong-Won (경희대학교 경영대학 경영학부)
Publication Information
Journal of the Korea Society for Simulation / v.21, no.4, 2012 , pp. 11-24 More about this Journal
Abstract
We compared a DBR(drum-buffer-rope) system with a CONWIP(constant work-in-process) system in a production line with constant processing times. Based on the observation that a WIP-controlled line production system such as DBR and CONWIP is equivalent to a m-node tandem queue with finite buffer, we applied a max-plus algebra based solution method for the tandem queue to evaluate the performance of two systems. Numerical examples with 6 workstations were also used to demonstrate the proposed analysis. The mathematical analyses support that CONWIP outperforms DBR in terms of expected waiting time and WIP. Unlike the CONWIP case, sequencing workstations in a DBR affects the performance of the system. Delaying a bottleneck station in a DBR reduces expected waiting time.
Keywords
CONWIP; DBR; tandem queue; max-plus linear system;
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