基于关联性量化的碰撞安全性能正向设计

Forward Design of Collision Safety Performance Based on Relevance Quantification

基于美国新车评价规程(US-NCAP)研究了碰撞减速度波形与乘员损伤的量化关系,建立了标准约束系统仿真模型,以一阶加速度G1、二阶加速度G2、动态位移D为车体结构设计指标,胸部压缩量为乘员损伤指标,分析获得了不同结构下乘员损伤指标变化规律:D不变的情况下,当G1≤22g时,G1每增加1g,胸部压缩量降低2 mm,当G1>22g时,其对胸部压缩量影响较小;G1不变时,D每增加10 mm,胸部压缩量降低1 mm。以量化关系预测为基准,在某车型胸部压缩量优化过程中对量化关系进行了验证,结果表明,该模型预测精度为98%。

Based on the US-NCAP,relevance quantification of impact deceleration waveform and occupant injury is studied.A standard occupant restraint system model is built where the first-order acceleration G1,second-order acceleration G2 and the dynamic displacement D are selected as the design criteria of vehicle body structure.Chest compression is selected as the occupant injury criteria.The change rule of occupant injury criteria under different vehicle body structure is analyzed and obtained.It is found that when G1<22 g,G1 has a significant effect on the chest compression under the premise that dynamic displacement D is constant,an increase of 1g in G1 causes the chest compression to decrease by 2 mm.When G1>22 g,the change of G1 has little effect on the chest compression.When G1 remains unchanged,the dynamic displacement D has a significant influence on chest compression which decreases by 1 mm for every 10 mm increase in D.The forecast of qualification relationship is used as criterion,which is verified during the optimization of chest compression of vehicle model.The results show that this model features forecast accuracy of 98%.