基于TESW的正面碰撞建模理论与验证

Modeling theory and verification for frontal impact based on TESW

为了研究碰撞安全设计中乘员胸部减速度峰值大小与乘员约束系统、初始碰撞速度、车体结构和乘员响应之间的关系,以线性弹簧刚度k模拟乘员约束系统,并建立正面碰撞模型.在保持最大动态变形量C和反弹时间tm相等的特征下,采取简化的尖顶等效方形波TESW(tippedequ ivalent square wave)拟合实际碰撞中的车体减速度,计算质心时间tc等参数确定波型TESW的关键点.详细推导了基于尖顶等效方形波TESW的胸车动力方程并进行求解,比较了基于TESW的胸部减速度与实际胸部减速度,进一步加深了基于TESW的正面碰撞理论.结果表明:基于正面碰撞的TESW建模理论是正确的,且可以指导实际车体乘员约束系统的初步设计.

In order to study the relationship between the peak occupant chest deceleration as well as the occupant restraint system,initial impact velocity,vehicle structure and occupant response in the impact safety design,the linear spring stiffness k was used to simulate the occupant restraint system and a frontal impact model was established with.With keeping the maximum dynamic displacement C and rebound time tm in equal,the actual vehicle deceleration was fitted with the simplified tipped equivalent square wave（TESW）.The key points of TESW were determined through calculating such parameters as centroid time tc.The dynamic equation of the occupant chest versus vehicle based on TESW was derived and solved.The TESW-based chest deceleration was compared with the actual chest deceleration,and the TESW-based frontal impact theory was further enriched.The results show that the TESW-based modeling theory for frontal impact is right and can provide the direction for the preliminary design of the occupant restraint system.