Anti-collision ability and guiding mechanism of a new rotary guardrail

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (12) : 202-214.

ZHENG Zhi1，2,GENG Bo2,YANG Bo1,CHEN Wei3,WEI Sisi2

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Abstract

To explore the protective ability and guiding mechanism of new rotary guardrail，the refine finite element（FE） models of light truck，medium bus and heavy truck-guardrail were established.The collision simulation analysis of rotary guardrail，W-beam guardrail and concrete guardrail was carried out under the same protection level，and the comparisons with the actual car crash tests were made.The results indicate that the peak impact force of the rotary guardrail is reduced by 36% (light truck) and 57% (medium bus) during the vehicle-head-on collision stage and it is reduced by 82% and 88% on the tail-flick collision phase compared with the concrete guardrail.The maximum lateral deformation of the rotary guardrail is reduced by 89% and 35% compared to the W-beam guardrail.Under the impact of a heavy truck：Regarding the rotary guardrail，the left rear wheel of the heavy vehicle has been significantly raised despite the tail-flick collision phase.When the left rear wheel of the heavy vehicle is raised to 86cm，it will no longer be raised and gradually returned to the ground.At the end of the impact, the exit angle of the vehicle is only 7°，and the final lateral deformation of the guardrail was 327mm.The protection performance of the rotary guardrail is better than the traditional guardrails and its crashworthiness can reach 340 kJ.

Key words

transportation safety / rotary guardrail / collision simulation / anti-collision ability / guiding mechanism / composite material

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ZHENG Zhi1，2,GENG Bo2,YANG Bo1,CHEN Wei3,WEI Sisi2. Anti-collision ability and guiding mechanism of a new rotary guardrail[J]. Journal of Vibration and Shock, 2022, 41(12): 202-214

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