Bi-objective Design Optimization of a Manipulator Arm
Keywords:Bi-objective design optimization, Manipulator Arm, Design of experiments
Global business competition forces case study companies to improve their manipulator arms by providing better quality and lower costs to increase their domestic and international competitiveness. The authors investigated a manipulator arm design case study problem for loading 75 kilograms, with 15 kilograms mounted on the back as a counterbalance. The designer can adjust the size of each part while maintaining the original overall shape of the manipulator arm. The case study company determines the factors and the possible level of improvements in size, allowing it to either purchase or manufacture the part in Thailand. This paper proposes a bi-objective design optimization method for a manipulator arm by applying the finite element method with a full factorial design of experiment and optimization to minimize the total production cost and maximize safety factors. Results showed that the proposed method can reduce the total production cost from THB 34,117.64 to THB 25,698.40, while the factor of safety value increases from 3.08 to 9.13, compared to the traditional mechanical arm design.
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