The Effect of Workload Dependent Due-Dates on Job Shop Performance
The Effect of Workload Dependent Due-Dates on Job Shop Performance
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DOI：
10.1287/mnsc.29.7.799
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发表时间：
1983-07
影响因子：
5.4
通讯作者：
J. Bertrand
中科院分区：
文献类型：
--
作者：
J. Bertrand
本研究探讨了作业车间控制系统的交货期性能的工作量和机器的能力在车间的时间分阶段的表示的基础上的工作到期日。性能是衡量的平均值和标准差的迟到。两个参数用于改变到期日分配系统的功能：最低等待允许量（由SL表示）和允许加载的可用容量的最大比例（由CLL表示）。如果在加载新作业时观察到拥塞，则系统会增加等待时间。系统观察拥塞的能力由参数CLL和SL确定。仿真实验研究了分配系统的性能。结果表明，该分配系统在降低延迟标准差方面表现良好，但对参数值不太敏感;在90%的预期容量利用率的情况下，CLL应设置在平均可用容量的0.80和1.00倍之间，SL应设置在平均操作等待时间的0.55和0.90倍之间在店里分配系统还可以在控制平均迟到方面表现良好。如果SL设置在车间平均预期等待时间的0.55倍和0.75倍之间，则如果CLL设置在平均可用容量的0.70倍和0.80倍之间，则获得与车间利用率无关的恒定平均延迟。然而，平均迟到原来是相当敏感的工作量的工作组合的变化。最后，它表明，如果分配参数的值是适当的，平均作业延迟是独立的作业中的操作的数量。此属性可用于监视参数值的正确性。
This study explores the due-date performance of job shop control systems which base job due dates on a time-phased representation of the workload and the machine capacity in the shop. The performance is measured by the mean and the standard deviation of the lateness. Two parameters are used to vary the functioning of the due-date assignment system: a minimum allowance for waiting, denoted by SL, and a maximum fraction of the available capacity allowed for loading, denoted by CLL. The system increases the waiting lime allowance if congestion is observed when loading a new job. The capability of the system to observe congestion is determined by the parameters CLL and SL. Simulation experiments are used to investigate the performance of the assignment system. It is shown that the assignment system performs quite well with respect to reducing the standard deviation of the lateness; the performance is not very sensitive however to the parameter values used; with an expected capacity utilization of 90%, CLL should be set between 0.80 and 1.00 times the mean available capacity and SL should be set between 0.55 and 0.90 times the mean operation waiting time in the shop. The assignment system may also perform well with respect to controlling the mean lateness. If SL is set between 0.55 and 0.75 times the mean expected waiting time in the shop, a constant mean lateness is obtained independent of the utilization of the shop if CLL is set between 0.70 and 0.80 times of the mean available capacity. However, the mean lateness turns out to be quite sensitive to variations in the job-mix of the workload. Finally it is shown that if the values of the assignment parameters are adequate, the mean job lateness is independent of the number of operations in a job. This property can be used to monitor the correctness of the parameter values.