双圆柱气囊缓冲性能分析

基于有限元法和控制体积法,建立了双圆柱气囊缓冲系统的有限元模型。以着陆速度为6.7m/s,高为2m,直径为1m的圆柱形气囊为例,利用LS-DYNA软件计算气囊缓冲过程中空投设备的速度和加速度,并对影响气囊缓冲性能的织物弹性模量、排气孔开口面积以及气囊初始内压进行了分析。结果表明:(1)当气囊织物的弹性模量E≤0.5GPa时,增大弹性模量可以显著提高气囊的缓冲性能;当气囊织物的弹性模量E0.5GPa时,增大弹性模量对气囊缓冲性能的影响很小。(2)在不超过排气阀门值的范围内,增大气囊的初始内压可以有效地提高气囊的缓冲性能。

Simulation on impact attenuation capability of bi-cylinder airbags

Based on the finite element method and the control volume method,it is available to build a model for the impact attenuation of bi-cylinder.Taking the cylindrical airbag with the landing speed of 6.7m/s,the diameter of 1m and the height of 2m as an example,the landing velocity and acceleration are simulated by using the LS-DYNA software.At the same time,the effect of the elastic modulus,the venting area and the initial pressure in the airbag on the impact attenuation are also analyzed.The results show that:(1) Increasing the elastic modulus of airbag fabric will significantly improve the shock-absorbing capacity of the airbag,when the elastic modulus of airbag fabric is under 0.5GPa; however,the increasing has few effects on the improvement,when the elastic modulus of airbag fabric exceeds 0.5GPa.(2) Increasing the initial pressure of the airbag fabric will improve the shock-absorbing capacity of the airbag effectively,when the pressure is lower than the value of the venting area.