Development of Three-Objective Model for the location- allocation in supply chain distribution network of Nina oil

Locating deals with the location of facilities (manufacturing and services) to meet the organizationʹs objectives at the lowest cost and highest quality possible. Select a suitable location for the establishment of the facility, is searching to find a place that can be coordinated with special needs facilities. Establish distribution centers in appropriate locations could play a key role in reducing costs and increasing satisfaction levels. Distribution centers are considered as the interfaces which deliver goods from producers to consumers. In this study we try to determine the location of the warehouse and distribution depot for oil products distribution company of Nina oil to meet two objectives the minimum distance from the factory warehouse location (Sirjan) and the maximum covering retailers in the western provinces and the three-step data refinement process. Conducted a sensitivity analysis using two Met heuristic genetic algorithm and simulated annealing, different answers depending on the importance (weight) of the objective functions, Covering radius and the number of warehouses, are achieved and finally good results in terms of the importance of the objective functions for the management of Nina is offered. The results show that in the first approach (Considering the coverage radius of 100km), Tabriz (a warehouse), Tabriz and Ahvaz (two warehouse) and Ahvaz, Tabriz and Malayer (three warehouses) and In the second approach (Considering the coverage radius of 120km),Malayer (a warehouse), West Islamabad and Malayer (two warehouse), Malayer, West Islamabad and Urmia (three warehouses) were selected.