行人大腿冲击器的生物仿真度

摘要

Aiming at the biomechanical characteristics of upper leg impactor in the pedestrian protection collision test, THUMS( total human model for safety) model and upper leg impactor were compared and simulated. Firstly, the THUMS-SUV pedestrian accident is simulated, and the impact force and bending moment of THUMS model of upper leg were output. According to the initial condition and minimum energy status of pedestrian upper leg in the accident, two upper leg impactor collision models were established and simulated. The kinematic behavior, maximum bending moment and maximum impact force between THUMS upper leg and upper leg impactor were compared and analyzed. The result showed that the upper leg impactor had higher impact force, but lower bending moment compared to THUMS model. This paper indicates that, due to movement and contact of lower leg and upper body, the contact force and bending moment of upper leg is affected, which means the biofidelity improvement is needed for the upper leg impactor.%针对汽车行人保护碰撞试验中大腿冲击器的生物力学特性问题,采用THUMS(total human model for safety)人体模型与大腿冲击器进行对比仿真分析.模拟THUMS-SUV行人交通事故,并对THUMS人体模型大腿所受冲击力和弯矩进行了输出.根据事故中行人大腿初始碰撞条件和行人大腿最低能量状态,分别建立两种工况的行人大腿冲击器碰撞模型并进行模拟,对比分析行人大腿冲击器和THUMS人体模型大腿的动态响应、最大瞬间冲击力和最大弯矩.仿真结果表明:相对THUMS人体模型而言,大腿冲击器的最大瞬间冲击力偏高而最大弯矩偏低,行人小腿和上身的运动和接触作用,会影响大腿部位的接触力和最大弯矩,因此大腿冲击器的生物仿真度有待提高.