双圆柱气囊缓冲性能分析  

Simulation on impact attenuation capability of bi-cylinder airbags

作　　者：黄国[1] 黄海明[1] 徐晓亮[2] 李玮洁[1] 

机构地区：[1]北京交通大学工程力学研究所,北京100044 [2]北京临近空间飞行器系统工程研究所,北京100076

出　　处：《计算力学学报》2014年第2期212-216,共5页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(11272042)资助项目

摘　　要：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E>0.5GPa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。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 lm 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 ven- ting 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.

关 键 词：双圆柱气囊 缓冲 控制体积法 有限元法 

分 类 号：V19[航空宇航科学与技术—人机与环境工程] O39[理学—工程力学]