基于坐标系转换的乘员约束系统精确建模

Accurate Modeling of Occupant Restraint System Based on Coordinate System Transformation

在40%偏置碰撞乘员约束系统建模中,通常是对车身B柱下端的加速度进行近似处理后作为仿真模型的输入条件。本文基于布尔莎-沃尔夫坐标系转化原理,提出一种更为精确的乘员约束系统模型的输入条件,并利用多体动力学软件MADYMO进行了验证。对比两种方法的仿真和试验结果表明,与通常的方法相比,所提出的方法不但可使偏置碰撞中乘员约束系统的建模更加精确,而且简化了布尔莎-沃尔夫坐标系转化模型的求解过程。

In modeling occupant restraint system for 40% offset impact,it is common to conduct an approximation processing on the lower end acceleration of B pillar,which is then taken as the input of simulation model.In this paper,based on Bursa-Wolf coordinate system transformation theory,a more accurate input condition for occupant restraint system model is proposed and verified by multi-body dynamics software MADYMO. By comparing the simulation results of two methods with test data,it is shown that compared with conventional method,the new method proposed can not only make restraint system model more accurate,but also simplify the solving process of Bursa-Wolf coordinate system transformation.