Reliability-based design optimization for an occupant restraint system based on a probability and interval hybrid model

LIU Xin, CHEN De, ZHOU Zhenhua, HU Lin

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (20) : 240-246.

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PDF(1369 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (20) : 240-246.

Reliability-based design optimization for an occupant restraint system based on a probability and interval hybrid model

  • LIU Xin1,2, CHEN De2, ZHOU Zhenhua2, HU Lin2
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Abstract

Considering the influence of multi-uncertainties on an occupant restraint system, a reliability-based design optimization (RBDO) method based on probability and interval models was proposed.Firstly, the numerical model of the occupant restraint system was established and the validity was tested by the real vehicle crash experiment.Secondly, the uncertainties were described by the probability model and the interval model.The reliability-based design optimization problem based on probability and interval hybrid model was also constructed.Thirdly, the Karush-Kuhn-Tucker (KKT) optimization condition and the second order fourth moment method based on the maximum entropy principle were used to transform the original three-level nested optimization problem into single-level optimization problem.Finally, in order to further improve the efficiency, the approximate models for the vehicle occupant restraint system were established based on radial basis function and the approximate reliability-based design optimization problem was constructed and was solved by a genetic algorithm.The results show that the proposed method not only obtains the best design parameters for the occupant restraint system, but also upgrades the passive safety of the vehicle.Therefore, the proposed method may be used in the field of other vehicle safety.

Key words

occupant restraint system / reliability-based design optimization / hybrid model / maximum entropy principle / approximate model

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LIU Xin, CHEN De, ZHOU Zhenhua, HU Lin. Reliability-based design optimization for an occupant restraint system based on a probability and interval hybrid model[J]. Journal of Vibration and Shock, 2021, 40(20): 240-246

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