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首页> 外文期刊>International Journal of Production Research >Modelling and rescheduling of a re-entrant wafer fabrication line involving machine unreliability
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Modelling and rescheduling of a re-entrant wafer fabrication line involving machine unreliability

机译：涉及机器不可靠性的可重入晶圆生产线的建模和重新计划

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摘要

A methodology for rescheduling a semiconductor fabrication line in the presence of predicted and unpredicted machine unreliability and job demand is presented. The proposed methodology consists of four major steps. (1) Representation of the fabrication line: the fabrication line is represented using a Neuro-Expert Petri net (NEPN) model. The entire fabrication line is decomposed into a 'two machine and one buffer' subsystem and represented using the NEPN model. (2) Estimation of failure and repair rates: the probabilistic machine failure and repair rates are determined using the method proposed by Jeong and Kim (1998). (3) Activation of the rescheduling algorithm: the rescheduling algorithm is activated after the planned mean time to reschedule the fabrication line (T_f). T_f is calculated by taking into account the estimated machine failure and repair rates, and the threshold queue limits of the waiting jobs. The rescheduling algorithm is also activated in cases of unpredictable machine breakdown or repair, and where the job queue length exceeds a certain threshold. (4) Execution of the rescheduling algorithm: the rescheduling algorithm determines whether or not to reschedule a job onto another machine by taking into account factors such as due dates and profits generated by the jobs. The proposed solution methodology is explained using an illustrative example. The computational results developed for the makespan criteria reveal that the proposed methodology is reliable and performs relatively well.
机译：提出了一种在存在预测的和不可预测的机器不可靠性以及工作需求的情况下重新安排半导体生产线的方法。拟议的方法包括四个主要步骤。 （1）生产线表示：使用Neuro-Expert Petri网（NEPN）模型表示生产线。整个生产线被分解为“两机一缓冲”子系统，并使用NEPN模型表示。 （2）估计故障率和维修率：使用Jeong和Kim（1998）提出的方法确定概率性机器故障和维修率。 （3）重新调度算法的激活：在计划的平均时间之后重新调度算法以重新调度生产线（T_f）。通过考虑估计的机器故障和维修率以及等待作业的阈值队列限制来计算T_f。在无法预测的机器故障或维修以及作业队列长度超过特定阈值的情况下，也会激活重新计划算法。 （4）重新安排算法的执行：重新安排算法通过考虑诸如到期日期和作业产生的利润之类的因素来确定是否将作业重新安排到另一台机器上。所提出的解决方案方法通过一个说明性示例进行解释。针对制造期标准开发的计算结果表明，所提出的方法是可靠的，并且性能相对较好。

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