Topological Design of Electrothermomechanical Compliant Mechanisms Using Isogeomtric Analysis

doi:10.3901/JME.2023.21.177

Abstract

Abstract: To improve the computational efficiency, a method for topology optimization of electrothermomechanical compliant mechanisms using isogeometric analysis (IGA) is proposed. The NURBS curve is employed to express geometric model and analysis model. The modified solid isotropic material with penalization approach and the density distribution function are used to describe the material distribution. The electric-thermal-mechanical multi-physics coupling finite element analysis is carried out by the sequential coupling method. The maximization of the output displacement is developed as the optimization objective subject to the volume constraint. The model for topology optimization of electrothermomechanical compliant mechanisms using isogeometric analysis is established. The method of moving asymptotic is used to solve the topology optimization problem. Numerical examples are presented to demonstrate the validity of the proposed design method. Compared with the results obtained by topology optimization using the finite element analysis, the optimal layouts of electrothermomechanical compliant mechanisms obtained by the topology optimization using isogeometric analysis is different, and the boundary is more smooth. The output displacement of the mechanisms obtained by isogeometric analysis is larger. The number of iteration steps can be effectively reduced and the calculation efficiency is greatly improved using isogeometric analysis. The influence of different output stiffnesses on the optimal configurations and performance of the electrothermomechanical compliant mechanisms is analyzed.

Key words: compliant mechanisms, electrothermomechanical actuators, topology optimization, isogeometric analysis

CLC Number:

TH112

ZHAN Jinqing, YAN Jiakun, PU Shengxin, ZHU Benliang, LIU Min. Topological Design of Electrothermomechanical Compliant Mechanisms Using Isogeomtric Analysis[J]. Journal of Mechanical Engineering, 2023, 59(21): 177-187.

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