爆炸冲击作用时间差对盆骨和腰椎的损伤研究

为研究爆炸冲击环境下车内乘员小腿和座椅所受垂向冲击时间差对乘员盆骨和腰椎损伤的影响，利用Hyperworks和LS-DYNA进行建模和仿真分析，并结合小腿冲击试验和座椅跌落试验开展研究。分析结果表明:乘员小腿和座椅安装点单独受冲击时盆骨加速度、动态响应指数和腰椎z向力会分别产生正向和负向的峰值，但同时作用并控制冲击时间间隔时并不会出现正负峰值相抵消的现象；小腿和座椅安装点不同时受冲击时会加重乘员盆骨和腰椎损伤，且小腿先受冲击时损伤程度较座椅安装点先受冲击时严重。

Research on time interval of explosion impact on pelvis and lumbar spine injury

In order to research the influence of the time interval between the vertical impact of the lower legs of passenger and seat on the pelvis and lumbar injuries under explosive impact environment, Hyperworks and LS-DYNA were used to model and simulation analysis, and the research was carried out in combination with the lower legs impact test and the seat drop test. The results show that the positive and negative peaks are generated by the pelvic acceleration, dynamic response index and the z-direction force of the lumbar spine when the passenger’s lower legs and seat mounting points are impacted separately, but the positive and negative peaks do not weaken when the impact time interval is controlled. When the lower legs and seat mounting points are impacted at different time, injuries to the pelvis and lumbar spine of the passenger will be aggravated, and the damage degree of the lower legs impacted preferentially is more serious than that when the seat mounting points are impacted first.