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Dynamic card control strategy in pull manufacturing systems

机译:拉式制造系统中的动态卡片控制策略

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摘要

The dynamic control of cards in pull systems can improve the performance of a manufacturing system in a turbulent demand condition. The traditional fixed card approach can reduce the performance of a system in some cases. This article presents a dynamic card control methodology in order to keep a high level of performance measures. The proposed methodology is based on the observation of customer demand in order to detect the fluctuations and adjust the number of cards. The demand fluctuations is evaluated based on two moving average: the first on a medium horizon and the second on a short horizon. The comparison between the two moving averages is the signal of the controller developed. A simulation environment has been developed to test the proposed methodology in both kanban and Constant Work In Process (CONWIP) systems. The simulations conducted in several scenarios highlight the better performance obtained using the controller. The main performance measures investigated are: the throughput, the queue of orders waiting to be processed, the throughput time of the orders, the number of cards used and the orders delayed. The benefits are more relevant in the case reliability reduction of the manufacturing system.
机译:牵引系统中卡片的动态控制可以在需求动荡的情况下提高制造系统的性能。在某些情况下,传统的固定卡方法可能会降低系统的性能。本文介绍了一种动态卡控制方法,以保持高水平的性能指标。所提出的方法基于对客户需求的观察,以检测波动并调整卡的数量。需求波动是根据两个移动平均值进行评估的:第一个在中等水平,第二个在短期。两个移动平均值之间的比较是所开发控制器的信号。已经开发了一种模拟环境,以在看板和“持续进行中的工作”(CONWIP)系统中测试所提出的方法。在几种情况下进行的仿真突出显示了使用控制器获得的更好性能。研究的主要性能指标是:吞吐量,等待处理的订单队列,订单的吞吐量时间,使用的卡数和延迟的订单。在降低制造系统的可靠性的情况下,这些好处更为相关。

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