Track: Optimization

Abstract

This paper proposes a multi-objective mixed-integer linear programming (MOMILP) model to solve the traveling purchaser problem (TPP) with a sustainable supplier selection, order allocation, with multiple vehicles and a single product. The manufacturer’s target is to choose the best green suppliers from whom the materials can be purchased, which means that suppliers who will be able to provide low-cost products and generates minimum CO₂ emissions from transportation, while maximizing the social and environmental criteria of the material will be selected. As a result, the model consists of three objective functions, the first objective function aims at minimizing the total fixed and variable purchasing and transportations costs; the second objective function aims at minimizing the total transportation-related CO₂ emissions; the third objective function aims at maximizing the total green and social value of the materials purchased from the selected suppliers.