| Summary: | 碩士 === 朝陽科技大學 === 工業工程與管理系碩士班 === 96 === The automation of Material Handling System (MHS) can solve the problem of increasing shortage in labor market, and in the meantime improve the efficiency and elasticity of the production systems. Automated Guided Vehicle (AGV) is common MHS equipment adopted by many companies. Past research in the literature focuses mostly on the smoothness of AGV flow, only a few addressed the interactions between AGV dispatching and job dispatching rules. Therefore, the purpose of this research is to study the effects of AGV dispatching on the performances of job dispatching rules in job shops.
This study conducts a well-designed simulation experiment to discover the effects of AGV dispatching on the performances of job dispatching rules in job shops. A total of thirteen well-known dispatching rules and several AGV dispatching rules are considered. In addition to showing the interaction between them, a set of recommendations are given for the best combination of AGV and job dispatching rules under different system’s configuration and performance criteria.
This study finds that, from the first stage experiment, the station-oriented AGV rules (NV, RV, and FV) do not present significant interactions with job dispatching rules. On the other hand, from the second stage experiment, the vehicle-oriented rules (NIQ and RW) can improve system’s performance, especially when the system utilization is high.
Overall, the simulation results show that the best job dispatching rule is SPT when the job routing complexity is mild. However, PT +WINQ +AT is the best job dispatching rule when this routing complexity increases. The only exception is when the system has utilization is high, in that case RR rule would be the best. When routing complexity decreases, MDD outperforms others at low system utilization, and S/RMOP at high system utilization.
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