制动工况下主动卷收器参数对乘员离位位移影响的分析

主动控制卷收器(ACR)能改善乘员的离位位移并降低二次碰撞的风险。为探究制动工况下ACR对乘员的影响,首先进行志愿者实车道路试验和试验数据的乘员运动响应分析,并建立了包括主动人体模型的仿真模型。模型对标后搭建Kriging近似模型并采用NSGA-Ⅱ算法进行ACR参数优化。结果表明:优化后头部质心和第一胸椎(T1)的离位量分别减小了55%和73.44%,且回弹阶段各部位加速度明显减小,预紧力和乘员离位量呈负相关趋势,且与制动前触发相比,制动后触发ACR时,预紧时间的变化对乘员离位的影响较大。

An Analysis on the Effect of Active Retractor Parameters onOccupant's Out-of-position Displacement Under Braking Condition

The active control retractor(ACR)is beneficial to the reduction of occupant's out-of-position displacement and the minimization of secondary impact risk.In order to investigate the effect of ACR on occupants in braking conditions,a volunteer real vehicle road test is conducted with occupant kinematics responses analyzed based on test data,and a simulation model including active human model is built.After the verification of simulation model,a Kriging approximation model is set up and an optimization on ACR parameters is conducted using NSGA-II algorithm.The results show that the out-of-position displacements of head mass center and the 1st thoracic spine(T1)are reduced by 55%and 73.44%respectively,the accelerations of all parts are lowered significantly during rebound phase,the pretension force and the occupant's out-of-position displacement shows a tendency of negative correlation,and compared with triggering before braking,the pretensioning time in triggering ACR after braking has a larger effect on the out-of-position displacement of occupant.