重装回收系统双气室气囊缓冲特性分析

Cushioning characteristics of double-chamber airbag for heavy equipment recovery system

为了得到气囊主要参数对缓冲特性的影响规律,利用重装的动力学方程、气体热力学基本方程和排气口流量方程建立了双气室气囊的解析模型,并采用Hyperworks对其有效性进行了验证。利用该模型对双气室气囊缓冲特性进行了研究,结果表明,初始压强、主辅气囊排气口面积以及气囊体积比对气囊缓冲特性有显著的影响。增加主气囊初始压力和气囊的体积比可以降低气囊缓冲过程中的最大冲击过载,重装触地速度有所提高;主辅气囊排气口面积过小,释能不充分,气囊将发生反弹,排气口面积过大,能量转化不够,重装触地速度较高。

In order to obtain cushioning characteristics of airbag under the variation of its main parameters, and based on dynamic equations, thermodynamics equations and flow equation of venting orifice, an analytical model has been built up and validated by using I-Iyperworks. Then, based on the model, the deceleration characteristics were investigated. A series of simulations were conducted to find out the influential factors on cushioning characteristics, such as volume ratio of slave-master bags, initial pressure and venting orifice area. The initial inflation pressure also is a key parameter to affect the cushioning properties, and the maximum deceleration decreases with the increase of initial inflation pressure, but at the same time the ending velocity of the heavy equipment will have a tiny increase. If the venting orifice area is too small, the airbag will rebound because the impact energy can＇t be released in time; but if the venting orifice is too large, the ending velocity of the heavy equipment will exceed its limit because no enough impact energy is transferred to the airbag attenuation system.