MULTI-OBJECTIVE ENERGY EFFICIENT MIXED MODEL ASSEMBLY LINE SEQUENCING FOR SUSTAINABLE MANUFACTURING

2020 ◽  
Vol XVII (2) ◽  
pp. 47-60
Author(s):  
Muhammad Umair ◽  
Mirza Jahanzaib ◽  
Saif Ullah
Keyword(s):  
Genetic Algorithm ◽  
Energy Consumption ◽  
Energy Efficient ◽  
Assembly Line ◽  
Mixed Model ◽  
Setup Time ◽  
Shop Floor ◽  
Multi Objective ◽  
Mixed Model Assembly Line ◽  
Mixed Model Assembly

The sustainability of manufacturing systems is not thoroughly investigated in the existing literature despite that fact that it affects service-oriented organisations. This paper addresses this gap by incorporating the criterion of energy consumption in mixed model assembly line sequencing (MMALS) to explore the potential for energy saving. Energy consumption was integrated with makespan and sequence dependent setup time of mixed models to achieve the sustainability in sequencing. A mathematical model was developed for the optimisation of energy efficient MMAL (EEMMAL). The multi-objective intelligent genetic algorithm (MOIGA) was proposed for minimisation of three conflicting objectives. A case study was conducted using centrifugal pump assembly line to test the performance of proposed MOIGA and the results were compared with those obtained from multi-objective genetic algorithm (MOGA). Finally, a trade-off analysis was conducted between total setup time, makespan (a service level measure on shop floor) and energy consumption (a factor of environmental sustainability). This analysis indicated the effectiveness of MOIGA (compared to MOGA) for EEMMALS problems.

scholarly journals Multi-objective optimization of mixed model assembly line balancing in an assemble-to-order industry with stochastic environment

2020 ◽  
Vol 12 (3) ◽  
pp. 90-107
Author(s):  
Ayele Legesse ◽  
Ermias Tesfaye ◽  
Eshetie Berhan
Keyword(s):  
Genetic Algorithm ◽  
Assembly Line ◽  
Mixed Model ◽  
Assembly Line Balancing ◽  
Stochastic Environment ◽  
Multi Objective Optimization ◽  
Nsga Ii ◽  
Multi Objective ◽  
Mixed Model Assembly Line ◽  
Mixed Model Assembly

The objective of this research is to propose a methodology for multi-objective optimization of a mixed-model assembly line balancing problem with the stochastic environment. To do this a mathematical model representing the problems at hand is developed with objectives of minimizing cycle time and minimization of the number of workstations (which is of Type-E ALB problem). And two optimization meta-heuristics are considered to solve it, namely, Non-Dominated Sorting Genetic Algorithm- II (NSGA-II) and Multi-Objective Genetic Algorithm (MOGA). To test the performance of the algorithms three different size standard problems in Assemble-to-order types of industry are taken and five demand arrival scenarios are considered to incorporate the stochastic nature of the demand arrival for each model in all problems. Both the algorithms are coded and run using MATLAB® 2013a and are compared based on different performance measures. The results indicated that MOGA outperformed NSGA-II in most of the test problems. Nevertheless, both algorithms have resulted in significant improvements in the performance measures in Assemble-to-order types of industry dataset compared to the existing line configuration. Keywords: Assembly Line, Multi-objective optimization, Single model, mixed-model, stochastic environment, Genetic Algorithm

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