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Integrated lightweight optimization design of wall thickness, material, and performance of automobile body side structure

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Abstract

To achieve lightweight of automobile body side structure, a body optimization framework is established. The optimization framework includes numerical simulation, wall thickness, and material set parameterization, design of experiment, surrogate model, NSGA-II, and multi-criteria decision making (MCDM). The finite element model of automobile body side collision is established, and the accuracy of the model is verified by side collision experiment. The problem that it is difficult to embed discrete material variables into the optimization model is solved by using material set parameterization technology. The RBF surrogate model and NSGA-II are applied to the multi-objective lightweight optimization of the body side structure. A hybrid weight & GRA decision method is proposed for Pareto front data mining. Compared with other MCDM methods, the decision results using hybrid weight & GRA are more robust and reasonable. Through the integrated optimization of the wall thickness, material, and performance of the body side structure and the Pareto front data mining, the mass of the body side structure is reduced by 9.21 kg, the lightweight rate is up to 15.93%, and the crashworthiness performance indicators meet the design baseline requirements.

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Acknowledgements

This work was supported by the Research Fund of Changzhou University [ZMF23020188].

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Authors and Affiliations

  1. School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou, 213164, China

    Shenhua Li, Dashuang Zhou & Anxia Pan

Authors
  1. Shenhua Li
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  2. Dashuang Zhou
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  3. Anxia Pan
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Contributions

All authors contributed to the study conception and design. Methodology, material preparation, numerical simulation, data collection and analysis were performed by Shenhua Li. The first draft of the manuscript was written by Shenhua Li. Software, writing-review and editing were performed by Dashuang Zhou. Anxia Pan commented on previous versions of the manuscript.

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Correspondence to Shenhua Li.

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Li, S., Zhou, D. & Pan, A. Integrated lightweight optimization design of wall thickness, material, and performance of automobile body side structure. Struct Multidisc Optim 67, 95 (2024). https://doi.org/10.1007/s00158-024-03810-1

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