Presentation and implementation multi-objective mathematical models to balance the assembly line

The use of assembly lines is one of the important approaches in the mass production of industrial products. Unbalanced assembly lines increase cycle time and idle times, resulting in reduced production rates, line efficiency, and increased system costs, which ultimately lead to low productivity. A hybrid model assembly line is a type of production line on which various models of products are assembled. These assembly lines are increasingly accepted in the industry in order to overcome the diversity of customer demand. The hybrid model assembly line is able to respond quickly to sudden changes in demand for different models of a product without high inventory maintenance. The purpose of this paper is to present a linear integer mathematical model of multi-objective for balancing assembly lines, in order to solve which the global criteria method has been used. The three objective functions considered in this model are: (1) minimizing the cycle time, (2) minimizing the idle time of each station, and (3) increasing the productivity of the assembly line. In order to study the model, Iran-Shargh Neishabour Company has been considered as a case study. The results show an improvement in the values of the objectives after the implementation of the proposed model for this problem.