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Uncertainty Optimization Design of a Vehicle Body Structure Considering Random Deviations

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Abstract

In vehicle body manufacturing, there are small differences between the actual value and design value of, for example, plate thickness and material characteristics. This is caused by the processing technology, environment and other uncertain factors. Therefore, the performance of the vehicle body processed according to the deterministic optimization solution fluctuates. The fluctuations may make structural performance fail to meet the design requirements. Thus, in this study, an optimization design is executed with 6\( \sigma \) robustness criteria and a Monte Carlo simulation single-loop optimization strategy based on the radial basis function neural network approximate model considering deviations in plate thickness, elastic modulus, and welding spot diameter, which is called the uncertainty optimization design method. As an example, considering the bending stiffness, torsion stiffness, and first-order frequency as constraints, the method is applied to the lightweight design of a car body structure, and the reliability of deterministic optimization design and uncertainty optimization design is compared. The results demonstrate that the uncertainty optimization design solution is effective and feasible without lowering the static stiffness and modal performance, and the weight is reduced.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (51775193) and the Science and Technology Planning Project of Guangdong Province, China (2016A050503021, 2015B0101137002, and 2017B010119001).

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China

    Jianhua Zhou, Fengchong Lan & Jiqing Chen

  2. Guangdong Provincial Key Laboratory of Automotive Engineering, Guangzhou, 510640, China

    Jianhua Zhou, Fengchong Lan, Jiqing Chen & Fanjie Lai

Authors
  1. Jianhua Zhou
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  2. Fengchong Lan
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  3. Jiqing Chen
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  4. Fanjie Lai
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Correspondence to Jianhua Zhou.

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Zhou, J., Lan, F., Chen, J. et al. Uncertainty Optimization Design of a Vehicle Body Structure Considering Random Deviations. Automot. Innov. 1, 342–351 (2018). https://doi.org/10.1007/s42154-018-0041-9

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  • DOI: https://doi.org/10.1007/s42154-018-0041-9

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