Abstract
Although deterministic optimization has to a considerable extent been successfully applied in various crashworthiness designs to improve passenger safety and reduce vehicle cost, the design could become less meaningful or even unacceptable when considering the perturbations of design variables and noises of system parameters. To overcome this drawback, we present a multiobjective robust optimization methodology to address the effects of parametric uncertainties on multiple crashworthiness criteria, where several different sigma criteria are adopted to measure the variations. As an example, a full front impact of vehicle is considered with increase in energy absorption and reduction of structural weight as the design objectives, and peak deceleration as the constraint. A multiobjective particle swarm optimization is applied to generate robust Pareto solution, which no longer requires formulating a single cost function by using weighting factors or other means. From the example, a clear compromise between the Pareto deterministic and robust designs can be observed. The results demonstrate the advantages of using multiobjective robust optimization, with not only the increase in the energy absorption and decrease in structural weight from a baseline design, but also a significant improvement in the robustness of optimum.
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Acknowledgements
The support from National 973 Project of China (2010CB328005), Key Project of National Science Foundation of China (60635020) and Program for Changjiang Scholar Innovative Research Team in Hunan University. The first author is also grateful the supports from China Scholarship Council (CSC).
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Sun, G., Li, G., Zhou, S. et al. Crashworthiness design of vehicle by using multiobjective robust optimization. Struct Multidisc Optim 44, 99–110 (2011). https://doi.org/10.1007/s00158-010-0601-z
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DOI: https://doi.org/10.1007/s00158-010-0601-z