护栏碰撞中车体加速度敏感性分析

Sensitivity analysis of vehicle acceleration during impact to a barrier

碰撞参数在试验组织中会产生误差,为了解车体冲击加速度指标对碰撞参数的敏感程度,建立车辆碰撞某组合式护栏有限元仿真模型,运用碰撞试验对有限元模型的可靠性进行验证后,进行敏感性分析。结果表明,仿真与碰撞试验结果相符,验证了仿真方法的可靠性;车体冲击加速度指标对车辆质量、碰撞角度与碰撞速度参数的敏感度系数分别为-0.58、1.63、4.18,碰撞速度是影响车体冲击加速度的最敏感因素。研究成果为制定碰撞试验误差范围有指导意义。

Impact parameter errors exist in test organization.In order to understand sensitivity of vehicle acceleration to impact parameters,a finite element simulation model for a vehicle impacting to a combined barrier was set up and sensitivity analysis was performed after the finite element model was proved to be correct with impact tests.The results indicated that the simulation method is reliable since the simulation results match to those of crash tests,the sensitivity coefficients of vehicle acceleration versus vehicle mass,impact angle and impact velocity are-0.58,1.63 and 4.18,the impact speed is the most sensitive factors to vehicle acceleration.The study results were a guidance to establish error range of impact test.