Multi-objective balancing of Parallel Mixed-Model assembly lines by Considering Machine and Worker Constraints

Assembly line balancing has been a focus of interest to academics in operation management for the last decades. Despite diverse research works in this field, many problems still remained unsolved. Given the importance and attractiveness of the mixed product parallel lines balancing problem and the importance of the human factor in the development process and also very few studies in relation to several simultaneous objectives that is a new approach in the field of parallel assembly lines, this paper presents a two-objective combined integer mathematical model for balancing mixed-model parallel assembly lines. By assigning variables in the form of zero-one and considering the limitations of both machinery and manpower at the same time, called Dual-Resource Constrained (DRC), it seeks to reduce the number of stations required in lines and minimize the total cost of human resources. The proposed model is evaluated by solving two numerical examples. Results reflect the good performance of the model and improved objectives. Keywords—assembly line balancing, parallel assembly lines, Mixed-Model, dual resources constraints, type I.