Multi-objective optimization design of new median guardrail

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (13) : 163-169.

LU Jijian, LEI Zhengbao

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Abstract

In view of the tire snagging phenomenon of the widely used median guardrail, a new median guardrail is designed. The crash safety of the new median guardrail is evaluated by explicit nonlinear finite element simulation. The dynamic responses of the barrier after collision, such as occupant impact velocity (v), occupant impact velocity (a), exit angle (EA), vehicle departure distance (d) and maximum lateral displacement (MD), are analyzed. Considering comprehensively, the acceleration in y direction of occupant impact (a_y) and vehicle departure distance (d) are selected as the objective functions, and the RBF surrogate model is constructed to reduce the calculation cost. Finally, multi-objective genetic algorithm is used to optimize and obtain the best design parameters of guardrail. Under the impact of small bus, medium bus and large truck, the new median guardrail shows good guidance ability. The finite element simulation results show that the guardrail can effectively prevent the tire snagging phenomenon, the departure distance only 2.06m, and the acceleration in the y direction of occupant collision is 118.2 m/s2, meeting the SB level protection requirements.

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median guardrail / RBF surrogate model / optimization design / tire snagging phenomenon / multi-objective genetic algorithm

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LU Jijian, LEI Zhengbao. Multi-objective optimization design of new median guardrail[J]. Journal of Vibration and Shock, 2023, 42(13): 163-169

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