Robust parameter design of supply chain inventory policy considering the uncertainty of demand and lead time

The uncertainty of demand and lead time in inventory management has posed challenges for the supply chain management. The purpose of this paper is to optimize the total profit and customer service level of supply chain by robust parameter design of inventory policies. This paper proposes system dynamics simulation, Taguchi method, and Response Surface Methodology (RSM) to model a multi-echelon supply chain. Based on the sequential experiment principle, Taguchi method combining location with dispersion modeling method is adopted to locate the optimum area quickly, which is very efficient to optimize the responses at discrete levels of parameters. Then, fractional factorial design and full factorial design are used to recognize significant factors. Finally, RSM is used to find the optimal combinations of factors for profit maximization and customer service level maximization at continuous levels of parameters. Furthermore, a discussion of multi-response optimization is addressed with different weights of each response. Confirmation experiment results showed the effectiveness of the proposed method. (C) 2019 Sharif University of Technology. All rights reserved.