车辆小重叠碰撞中滑移模式的研究

Study on the Slid Mode in Vehicle Small-Overlap Frontal Crash

基于平面运动理论提出了小重叠前撞时车辆滑移的理论分析方法,揭示了碰撞力与滑移量之间的关系,得到了实验和仿真的验证。将碰撞区域分为6个部分,提出了6阶碰撞力特征曲线。基于特征曲线和均匀设计法,通过提出的理论分析方法得到了车辆滑移量与不同特征曲线的样本空间。进一步,建立了BP神经网络,对特征曲线中6个区域的碰撞力值与滑移量进行了敏感度分析,识别出此工况下的最关键碰撞区域。本文提出的理论方法和进行的敏感度分析,为小重叠前撞的结构设计提供了理论支持。

Based on the plane motion theory,a theoretical analysis method for the slide mode of the vehicle in small-overlap frontal crash is proposed,and the relationship between the slide value and the impact forces is revealed and verified by experiments and tests.The impact area is divided into six parts and the sixth-order impact force characteristic curves are put forward.Based on the characteristic curves and the uniform design method,the sample space of vehicle slide value and different characteristic curves is obtained by using the theoretical method proposed.Furthermore,the BP neural network is established to conduct a sensitivity analysis of the impact forces and the vehicle slide value in the six regions of characteristic curves,with the critical impact region under that working condition identified.The theoretical method proposed and the sensitivity analysis conducted provide a theoretical support for the structural design for small-overlap frontal crash.