Hybrid Approach of Finite Element Method, Kigring Metamodel, and Multiobjective Genetic Algorithm for Computational Optimization of a Flexure Elbow Joint for Upper-Limb Assistive Device

Modeling for robotic joints is actually complex and may lead to wrong Pareto-optimal solutions. Hence, this paper develops a new hybrid approach for multiobjective optimization design of a flexure elbow joint. The joint is designed for the upper-limb assistive device for physically disable people. T...

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Veröffentlicht in:Complexity (New York, N.Y.) Jg. 2019; H. 2019; S. 1 - 13
Hauptverfasser: Dang, Van Anh, Chau, Ngoc Le, Dao, Thanh-Phong, Nguyen, Duc Nam
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Cairo, Egypt Hindawi Publishing Corporation 01.01.2019
Hindawi
John Wiley & Sons, Inc
Wiley
Schlagworte:
Biomechanics
Decision making
Design optimization
Elbow
Elbow (anatomy)
Energy
Engineering
Evolutionary algorithms
Finite element analysis
Finite element method
Flexing
Genetic algorithms
Mathematical models
Mathematical problems
Metamodels
Multiple objective analysis
Optimization algorithms
Optimization techniques
Pareto optimization
Pareto optimum
Rehabilitation
Robotics
Robots
Sensitivity analysis
Stroke
Torque
Variance analysis
ISSN:1076-2787, 1099-0526
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Zusammenfassung:Modeling for robotic joints is actually complex and may lead to wrong Pareto-optimal solutions. Hence, this paper develops a new hybrid approach for multiobjective optimization design of a flexure elbow joint. The joint is designed for the upper-limb assistive device for physically disable people. The optimization problem considers three design variables and two objective functions. An efficient hybrid optimization approach of central composite design (CDD), finite element method (FEM), Kigring metamodel, and multiobjective genetic algorithm (MOGA) is developed. The CDD is used to establish the number of numerical experiments. The FEM is developed to retrieve the strain energy and the reaction torque of joint. And then, the Kigring metamodel is used as a black-box to find the pseudoobjective functions. Based on pseudoobjective functions, the MOGA is applied to find the optimal solutions. Traditionally, an evolutionary optimization algorithm can only find one Pareto front. However, the proposed approach can generate 6 Pareto-optimal solutions, as near optimal candidates, which provides a good decision-maker. Based on the user’s real-work problem, one of the best optimal solutions is chosen. The results found that the optimal strain energy is about 0.0033 mJ and the optimal torque is approximately 588.94 Nm. Analysis of variance is performed to identify the significant contribution of design variables. The sensitivity analysis is then carried out to determine the effect degree of each parameter on the responses. The predictions are in a good agreement with validations. It confirms that the proposed hybrid optimization approach has an effectiveness to solve for complex optimization problems.
Bibliographie:ObjectType-Article-1
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ISSN:1076-2787
1099-0526
DOI:10.1155/2019/3231914