A Job Shop Scheduling and Location of Battery Charging Storage for the Automated Guided Vehicles (AGVs)

Subject Areas : Operation and Chain Management

Saeed Dehnavi-Arani ¹ ( Department of Industrial Engineering, Yazd University, Yazd, Iran )
Ali Sabaghian ² ( Department of Management, Naragh Branch, Islamic Azad University, Naragh, Iran )
Mehdi Fazli ³ ( Department of Industrial engineering, Iran University of Science and Technology, Tehran, Iran )

Received: 2017-08-29 Accepted : 2018-02-19 Published : 2019-07-01

Keywords: AGV, job shop scheduling, Battery Charging Storage (BCS), GAMS software,

Abstract :

When the Automated Guided Vehicles (AGVs) are transferring the parts from one machine to another in a job shop environment, it is possible that AGVsstopon their guidepaths since their batteries are discharged.Consequently, it is essential to establish at least one Battery Charging Storage (BCS) to replace full batteries with empty batteries for the stopped AGVs. Due to non-predictable routes for AGVs in the manufacturing systems, to find the best place toestablish the BCS can impact performance of the system. In this paper, anintegrated mathematical modelof job shop and AGV schedulingwith respect tothe location of a BCS is proposed. The proposed nonlinear model is transformed into a linear form to beefficiently solvedin GAMS software. Finally, several numerical examplesare presented to test the validity of the proposed mathematical model.The results show that the optimal cost and location of BCS can be obtained with respect to the number of AGVs, machines, parts, and other problem parameters. In addition, it is concluded that the increasing number of AGVs in a manufacturing systemcannot be always a suitable policy for reducing the cost because in such conditions.Further to that, the conflict of AGVs may increase leading tothe increase of the makespan. In other words, following the optimal point, increasing AGVs leads to the increase in costs.

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