Development of a Fuzzy Double -Objective Model for Setting Safety Stock Inventory Units of Supply Chain

Uncertainty is an inseparable part of supplying chain management, which could be resulted from the customer’s demand fluctuation, change of production capacity or lack of reliability of the raw materials suppliers and the contractors. to act properly in response of the said matters, the safety stock could be used.In the present article, considering the existing problems and conditions of Ghataat Mehvari khorasan Company brought in this text, a fuzzy double objective model has been developed based on the total cost and the customer service level to set the safety stock in the supply chain of the mentioned company. Also,existing limitations in the said unit including production capacity,batch size for ordering raw materials and financial limitation for purchasing raw materials are considered for the model. the fuzzy reliability of suppliers and contractors has been specified by a fuzzy expert system with no presumption for demand distribution, and to control and correct all the anticipation deviation from the fact,the rolling horizon technique is used and finally safety stock has been set in such way that the minimum total cost and the customer service level have reached a designed level.