着陆气囊缓冲过程数值模拟研究

Numerical Simulation of Airbag Cushion Process of Landing

目的对某大型空降装备着陆缓冲系统的可排气型气囊缓冲过程进行数值模拟研究。方法基于有限元方法,建立着陆缓冲系统的有限元模型,采用控制体积法,利用显式动力分析软件LS-DYNA对着陆气囊的缓冲过程进行数值模拟,分析了气囊缓冲过程中气囊内压、气囊剩余高度和气囊排气速率等特性的变化规律,以及气囊织布的弹性模量、排气压力和排气口面积等主要参数变化时对气囊缓冲特性的影响规律。结果对气囊的缓冲特性影响较大的参数为气囊的排气压力和排气口面积,当气囊织布的弹性模量高于0.2 GPa时,弹性模量的变化对气囊的缓冲特性影响较小。结论研究结果可为工程人员进行气囊初始设计和对气囊缓冲过程进行模拟仿真提供参考。

In this research, the numerical simulation of the cushion process of the exhausting airbag in the landing system of the large airborne equipment was conducted. Based on the finite element method, the finite element model of landing cushion system was established. Using the control volume method, the dynamic analytical software LS-DYNA was adopted to simulate the airbag cushion process and obtain the changing patterns of the airbag parameters such as the internal airbag pressure, the residual airbag height and the velocity of air exhausting, then the influencing rules were analyzed of the changes of main parameters（elastic modulus of the airbag weaving, exhaust pressure, exhaust port area） on the cushioning property of the airbag. The research results showed that the exhaust pressure and the exhaust port area had greater influence on the airbag cushioning property. When the elastic modulus of the airbag fabrics was higher than 0.2 GPa, less effect of elastic modulus on the airbag cushioning property was observed. The results of the study can provide reference on airbag initial design and simulation of the airbag cushion process for the engineering personnel.