冲击载荷作用下某型气囊缓冲性能影响研究

目的 研究冲击载荷作用下排气孔面积及初始缓冲时刻对某型气囊缓冲性能的影响。方法 采用MIMICS软件，并结合LS-Prepost软件，建立髋骨-气囊-地面有限元模型，利用LS-DYNA软件对气囊的缓冲过程进行仿真计算，得到缓冲过程中该模型的动力学响应结果。通过分析髋骨模型受力及气囊状态的变化，探讨排气孔面积及初始接触时刻对气囊缓冲性能的影响。结果 排气孔面积为0~40 mm²时，髋骨模型受力峰值最大为1 710 N，最小为1 549 N，模型受力峰值变动幅度约10.4%；初始缓冲时刻改变时，髋骨模型受力峰值最大为1 769 N，最小为1 644 N，模型受力峰值变动幅度约7.6%。结论 随着排气孔面积的增大，气囊缓冲性能先提升、后降低；随着初始缓冲时刻的推迟，气囊缓冲性能先提升后、降低。改变排气孔面积能更好地改善气囊缓冲特性。

Effect of Impact Load on the Buffering Performance of a Certain Type of Airbag

This paper aims to study the effect of vent area and initial buffer time on the buffer performance of a type of airbag under impact load. The HIP bone-airbag-ground finite element model was established by using Mimics software and LS-prepost software. The simulation calculation of the airbag buffer process was carried out by using LS-DYNA software, and the dynamic response results of the model in the buffer process were obtained. The influence of vent area and initial contact time on the cushioning performance of the airbag was discussed by analyzing the changes of force and airbag state in the hip model. Within the range of 0~40 mm2, the maximum peak value of the hip bone model was 1 710 N and the minimum was 15 49 N, and the variation range of the peak value was about 10.4%. When the initial buffer time was changed, the maximum peak value of the hip bone model was 1 769 N and the minimum was 1 644 N, and the variation range of the peak value of the hip bone model was about 7.6%. With the increase of the vent area, the buffer performance of the air bag increases first and then decreases. With the delay of the initial buffering time, the buffering performance of the airbag is firstly improved and then decreased. The buffer characteristics of air bag can be better improved by changing the vent area.