具瓶頸作業之Multiloop CONWIP拉式生產系統之模擬研究

A Simulation Study of Multiloop CONWIP Pull Production Systems with Bottleneck

本研究探討具瓶頸作業之Multiloop CONWIP（CONstand Work-In-Process）拉式生產系統的績效表現，透過設定不同的看板總數與瓶頸站位置，來探討分段點於瓶頸站前與分段點於瓶頸站後之兩種不同分段型態Multiloop CONWIP拉式生產系統的績效表現差異，並與CONWIP拉式生產系統做比較。本研究以七單機工作站序列式生產線來進行模擬實驗，主要績效衡量指標為：平均在製品數量（Work In Process, WIP）、週期時間（Cycle Time, CT）與產出率（Throughput, TH）。模擬實驗數據顯示，無論哪個工作站為瓶頸站，皆以分段型態為分段點於瓶頸站後之Multiloop CONWIP拉式生產系統的WIP與CT績效衡量最低，CONWIP拉式生產系統有最高產出率，而隨著看板總數的增加，此三種拉式生產系統的產出率均會提高且接近瓶頸站產出率。

This research studies the performances of the Multiloop CONWIP (CONstand Work-In-Process) and basic CONWIP pull production systems with different total number of cards and bottleneck locations. Simulation models of two-loop CONWIP and basic CONWIP lines consisting of seven machines in series are established for experiments. The performance measures used to evaluate are work in process, cycle time, and throughput. Simulation results show that the two-loop CONWIP line with the first loop being bottleneck has the best performances in cycle time and work in process, and the basic CONWIP line has the highest throughput. Throughputs of two-loop CONWIP and basic CONWIP lines approach to bottleneck rate as the total number of cards increases.