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An Efficient New Job Release Control Methodology

机译:高效的新工作释放控制方法

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摘要

This paper presents a new job release methodology: WIPLOAD Control (WIPLCtrl), which is a workload limited release methodology for the overall shop floor. The behaviour of WIPLCtrl is analyzed using the Markov process model of a transfer line system to observe the potential advantage of WIPLCtrl relative to the conventional measure of system workload using the WIP level. A simulation experiment is then conducted considering a simplified semiconductor wafer fabrication system. The performance of WIPLCtrl is compared with that of an open-loop release methodology and three other closed-loop workload limited release methodologies. A case study is also carried out by simulating a real-life wafer fabrication, considering the complexities and the distinguishing features of semiconductor manufacturing. The experimental results indicate that WIPLCtrl is an efficient job release methodology, capable of reducing both the mean and the standard deviation of the cycle time for a given throughput level. The performance of WIPLCtrl appears to be reliable with the increase of system congestion level and the increase of system variability caused by stochastic factors such as machine unreliability and processing time variability.
机译:本文介绍了一种新的作业发布方法:WIPLOAD Control(WIPLCtrl),这是整个车间的工作量受限的发布方法。使用传输线系统的马尔可夫过程模型分析了WIPLCtrl的行为,以观察WIPLCtrl相对于使用WIP级别的常规系统工作量度量的潜在优势。然后考虑简化的半导体晶片制造系统进行仿真实验。将WIPLCtrl的性能与开环释放方法和其他三种闭环工作负载有限释放方法的性能进行了比较。考虑到半导体制造的复杂性和显着特征,还通过模拟现实生活中的晶圆制造来进行案例研究。实验结果表明,WIPLCtrl是一种有效的作业发布方法,对于给定的吞吐量水平,它可以减少周期时间的平均值和标准偏差。 WIPLCtrl的性能随着系统拥塞程度的增加和由机器不可靠性和处理时间可变性等随机因素引起的系统可变性的增加而显得可靠。

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