Journal of Shanghai Jiao Tong University ›› 2020, Vol. 54 ›› Issue (12): 1324-1334.doi: 10.16183/j.cnki.jsjtu.2020.99.001

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Discrete Topology Optimization of Body-in-White Welding Production Platform Based on NSGA-III

GAO Yunkai1, MA Chao1(), LIU Zhe1, TIAN Linli2,3   

  1. 1.School of Automotive Studies, Tongji University, Shanghai 201804, China
    2.Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China
    3.Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan 430070, China
  • Received:2019-12-04 Online:2020-12-01 Published:2020-12-31
  • Contact: MA Chao


This paper proposes a modified third generation non-dominated sorting genetic algorithm (mNSGA-III) to overcome the poor convergence of third generation non-dominated sorting genetic algorithm (NSGA-III) in handling discrete topology optimization. It uses the mNSGA-III for the structural optimization of a body-in-white (BIW) welding production platform. It proposes an advanced extreme point selection to stabilize the normalization of populations. It constructs the finite element model of BIW welding production platform. Using discrete topology optimization, it treats the total mass, maximum stress and z-direction displacements of several nodes of platform as objective functions. It developed a discrete topology optimization program by using MATLAB interfaced the commercial finite element code MSC.Nastran. Finally, it selected the design with appropriate layout in view of stiffness and strength of the structure. The optimal design conforms to the design standards and the total mass reduces by 30.1%. The results show that mNSGA-III gets a more stable optimization process and easy to converge when solving the multi-objective discrete topology optimization problems. The proposed method provides an applicable method for the optimization of giant steel structures and has great values for practical engineering problem.

Key words: discrete topology optimization, multi-objective optimization, non-dominated sorting, genetic algorithm

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