Article: Lightweight design of a body-in-white structure using a hybrid optimisation approach Journal: International Journal of Vehicle Design (IJVD) 2022 Vol.88 No.2/3/4 pp.121 - 147 Abstract: To achieve lightweight of a body-in-white (BIW) structure, this study proposes a hybrid optimisation approach that integrates the subspace division of a BIW structure, relative sensitivity analysis, correlation analysis, NSGA-II (non-dominated sorting genetic algorithm II) combined with a RSM surrogate model, and design of experiments (DOE) combined with E-TOPSIS (entropy weight-technique for ordering preferences by similarity to ideal solution). The approach improves the optimisation efficiency and solves the problem of nonlinear crashworthiness optimisation. The decoupling of the linear basic performance and nonlinear collision safety performance of a BIW is achieved. According to the type of performance response, design variables are screened, and three subspace structures of the BIW are optimised. Optimisation results indicate that the mass of the BIW structure is reduced by 17.0 kg. The performance quotas of the BIW are within the specified design baseline range. Therefore, the proposed approach can be effectively applied to the lightweight design of a BIW structure. Inderscience Publishers - linking academia, business and industry through research

Title: Lightweight design of a body-in-white structure using a hybrid optimisation approach

Authors: Dengfeng Wang; Shenhua Li

Addresses: State Key Laboratory of Automotive Simulation and Control, College of Automotive Engineering, Jilin University, Changchun, Jilin, 130022, China ' State Key Laboratory of Automotive Simulation and Control, College of Automotive Engineering, Jilin University, Changchun, Jilin, 130022, China

Abstract: To achieve lightweight of a body-in-white (BIW) structure, this study proposes a hybrid optimisation approach that integrates the subspace division of a BIW structure, relative sensitivity analysis, correlation analysis, NSGA-II (non-dominated sorting genetic algorithm II) combined with a RSM surrogate model, and design of experiments (DOE) combined with E-TOPSIS (entropy weight-technique for ordering preferences by similarity to ideal solution). The approach improves the optimisation efficiency and solves the problem of nonlinear crashworthiness optimisation. The decoupling of the linear basic performance and nonlinear collision safety performance of a BIW is achieved. According to the type of performance response, design variables are screened, and three subspace structures of the BIW are optimised. Optimisation results indicate that the mass of the BIW structure is reduced by 17.0 kg. The performance quotas of the BIW are within the specified design baseline range. Therefore, the proposed approach can be effectively applied to the lightweight design of a BIW structure.

Keywords: BIW; body-in-white; lightweight design; crashworthiness optimisation; relative sensitivity analysis; correlation analysis; NSGA-II; DOE; design of experiments; TOPSIS; technique for ordering preferences by similarity to ideal solution.

DOI: 10.1504/IJVD.2022.127016

International Journal of Vehicle Design, 2022 Vol.88 No.2/3/4, pp.121 - 147

Received: 20 Mar 2020
Accepted: 07 Apr 2021
Published online: 18 Nov 2022 *

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Title: Lightweight design of a body-in-white structure using a hybrid optimisation approach

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