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Analysis of the Lead Time Distribution in multi-product systems with dedicated buffers

机译：专用缓冲区多产品系统的铅时间分布分析

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摘要

Perishable products that deteriorate before leaving the production system are common in industry. The most classic example is the food industry but several cases can be found in semiconductor manufacturing, and in polymers forming processes. These systems often require the scrapping of parts whose lead-time has exceeded a certain threshold. Previous works have considered single-product systems and have shown that the size of the buffers and actions dedicated to improve the machine availability may strongly affect the percentage of scrapped parts. In this paper, we model the dynamics of this phenomenon in a multi-product system composed of two machines that are connected through dedicated buffers. Furthermore, the model allows the use of three different policies for the mixing of products. The main contribution is a method for the calculation of the lead time distribution of each product that can be used to determine the effective throughput of the system. The relevance of the method is shown by means of numerical results that provide important insights on the problem and show counterintuitive behaviors.
机译：在离开生产系统之前恶化的易腐产品在工业中很常见。最古典的例子是食品工业，但在半导体制造中可以发现几种情况，以及聚合物形成过程。这些系统通常需要划线时间超过某个阈值的部分。以前的作品已经考虑了单产品系统，并显示了专用于提高机器可用性的缓冲区和动作的大小可能会强烈影响报废零件的百分比。在本文中，我们在由两种通过专用缓冲器连接的机器组成的多产品系统中模拟了这种现象的动态。此外，该模型允许使用三种不同的产品策略来混合产品。主要贡献是计算可用于确定系统有效吞吐量的每个产品的铅时间分布的方法。通过数值结果显示该方法的相关性，这些结果提供了对问题的重要见解并显示违反直行行为。

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