Robust optimization design model for vehicle body crashworthiness based on parametric interval analysis

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (5) : 37-44.

WANG Qiong, LIU Guiping

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Abstract

A robust optimization design model for vehicle body crashworthiness considering tolerances was proposed based on interval analysis to effectively reduce sensitivity of crashworthiness to fluctuation of design parameters, and realize maximization of tolerances’ ranges.Firstly, uncertainties of design parameters, such as, size, position and shape of vehicle body’s key collision resistant parts in vehicle collision model were described with symmetric tolerances.Then, parametric design was combined with tolerance design to establish a multi-objective optimization model with robustness evaluation indexes and tolerance evaluation indexes taken as optimization objectives, and synchronous optimization of nominal values of design variables and their tolerances.Thirdly, the interval possible degree was used to deal with uncertain constraints, and the optimization model with uncertainties was converted into a deterministic multi-objective optimization one.Finally, the proposed model was applied in two vehicle crashworthiness optimization design problems, and they were solved using the sequence quadratic programming method and the improved non-dominant sorting genetic algorithm.The results showed that the proposed robust optimization design model and method are feasible and practical.

Key words

robustness / optimization design / tolerance / vehicle body crashworthiness / interval analysis

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WANG Qiong, LIU Guiping. Robust optimization design model for vehicle body crashworthiness based on parametric interval analysis[J]. Journal of Vibration and Shock, 2020, 39(5): 37-44

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