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Multi-objective optimization for bus body with strength and rollover safety constraints based on surrogate models

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Abstract

It is important to consider the performances of lightweight, stiffness, strength and rollover safety when designing a bus body. In this paper, the finite element (FE) analysis models including strength, stiffness and rollover crashworthiness of a bus body are first built and then validated by physical tests. Based on the FE models, the design of experiment is implemented and multiple surrogate models are created with response surface method and hybrid radial basis function according to the experimental data. After that, a multi-objective optimization problem (MOP) of the bus body is formulated in which the objective is to minimize the weight and maximize the torsional stiffness of the bus body under the constraints of strength and rollover safety. The MOP is solved by employing multi-objective evolutionary algorithms to obtain the Pareto optimal set. Finally, an optimal solution of the set is chosen as the final design and compared with the original design.

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Acknowledgement

This work was supported in part by the National High Technology Research and Development Program (“863” Program) of China under Grant no. 2007AA04Z133.

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Authors and Affiliations

  1. State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Bei**g, 100084, China

    Ruiyi Su, Liang** Gui & Zijie Fan

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  1. Ruiyi Su
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  2. Liang** Gui
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  3. Zijie Fan
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Correspondence to Ruiyi Su.

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Su, R., Gui, L. & Fan, Z. Multi-objective optimization for bus body with strength and rollover safety constraints based on surrogate models. Struct Multidisc Optim 44, 431–441 (2011). https://doi.org/10.1007/s00158-011-0627-x

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  • DOI: https://doi.org/10.1007/s00158-011-0627-x

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