Production control policy for tandem workstations with constant service times and queue time constraints |
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| Authors: | Kan Wu Liang Gao C.K.M. Lee |
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| Affiliation: | 1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore;2. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, China;3. Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, Hong Kong, China |
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| Abstract: | Queue time constraints are commonly imposed to ensure product quality in contemporary production systems. We study the performance of two single stations with deterministic service times and a predetermined time window in between, where both stations suffer time-based pre-emptive breakdowns. To improve productivity, achieving higher capacity and lower rework rate are the two main objectives. While higher capacity requires a higher work-in-process (WIP)-level threshold, a lower rework rate requires a smaller one. To quantify the trade-off between the two objectives, an analytical model is derived. The model is then used to derive the WIP-level threshold control policy for a time-constrained system. We also show that system capacity diminishes with the decrease in WIP-level thresholds. |
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| Keywords: | production control process modelling time window |
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