ABSTRACT

In this paper, we investigate a two-echelon, two-product Supply Chain (SC) inspired by a real-world production/distribution firm, in which the product change-over time, necessary to switch from a product to another, induces a variable capacity in the factory. Such a varying production capacity is further exacerbated by the machine breakdowns that may occur in the manufacturing system. Since the two products share the same production system, a production planning rule has to be executed to decide the change-over, i.e. to select the product to be manufactured over time. An extended experimental campaign has been performed to investigate how the fill rate and the standard deviation of inventories vary as a series of operational and tactical parameters changes. Several ANOVA analyses revealed a strong interaction between the production planning model and the adopted smoothing replenishment strategy, which remarkably affects the performance of the SC. Interestingly, a higher value of the proportional controller negatively affects the service levels since the adopted production planning policy, under these circumstances, tends to encourage longer production runs for a certain product and, consequently, persistent stock outs for the other one.

摘要

在本文中，我们研究了一个由现实世界的生产/分销公司启发的两级，两产品供应链（SC），其中，从一种产品切换到另一种产品所必需的产品转换时间会导致工厂的可变容量。生产系统中可能发生的机器故障进一步加剧了这种变化的生产能力。由于两种产品共享相同的生产系统，因此必须执行生产计划规则来确定转换，即选择随时间推移要生产的产品。已经进行了扩展的实验活动，以调查随着一系列作战和战术参数的变化，填充率和库存标准偏差如何变化。多项方差分析表明，生产计划模型与采用的平滑补货策略之间存在强大的交互作用，这显着影响了SC的性能。有趣的是，比例控制器的较高值会对服务水平产生负面影响，因为在这种情况下，采用的生产计划政策往往会鼓励某个产品更长的生产周期，因此会导致另一产品的持续缺货。