Design and Analyze the Batch Ordering Supply Chain System

供應鏈管理是這十幾年來非常熱門的題目，有非常多的學者專家從事這方面的研究。這一領域上的研究者，大都是將討論的重心，放在訂貨策略之議題上，使得存貨成本降低，以及如何降低所謂的長鞭效應(Bullwhip effect)上。其中之一就是利用系統程序控制理論來決定訂貨策略，本文將使用此理論觀念，對一批式之訂貨方式的供應鏈系統提出一套離散的動態模式，然後採用訊號處理的數學方法將之轉換成z-transform之型態，來清楚描述供應鏈的運作行為，並詳細說明造成系統不穩定的因素，以及引起長鞭效應的主因，在此不僅可以用數學加以證明其動態行為，甚至利用程式加以模擬其結果。結果顯示造成長鞭效應的主因，除了需求的變異外，就是訂貨策略了。

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並列摘要

The design and management of a supply chain system have already attracted many attentions among process system engineering researchers recently. One of these areas is the analysis of logistic management for a supply chain using the system control theory. A supply chain can be viewed as a discrete system with lead times and operating constraints. In this paper, we use material and information balances to design a discrete dynamic model for a batch ordering supply chain system. The explicit transfer function model of the closed loop response is obtained by z-transform. The entire chain can be modeled by connecting these transfer functions in to a block diagram. In order to derive the z-transform model of the batch ordering system, we first use the signal processing technique. The model proves to be a very powerful tool that reveals the dynamics characteristic of the system. Moreover, the use of the dynamic process control theory allows us to design the inventory level control strategies and analyze its dynamics behaviors. Based on the transfer functions in z-transform, it becomes possible to explore the stability of a supply chain. Furthermore, we can show the effective reduction of the bullwhip effect and improvement of customer satisfaction for a batch ordering supply chain by implementing a proportional integral control or a cascade control.

並列關鍵字

Supply chain ； Bull whip effect ； z-Transform ； Batch ordering ； Cascade control ； Decimator ； Expander

國際替代計量

Design and Analyze the Batch Ordering Supply Chain System

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