气囊缓冲机理研究及排气口面积的影响  

Study on the Cushioning Properties of Airbag and the Effect of Vent Size

作　　者：吴琼[1] 余莉[1] 姚向茹 

机构地区：[1]南京航空航天大学航空宇航学院,江苏南京210016

出　　处：《计算机仿真》2016年第9期85-89,共5页Computer Simulation

基　　金：国家自然科学基金(11172137);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为了研究排气口面积对气囊缓冲性能的影响,建立了某无人机气囊缓冲系统有限元数值模型。采用控制体积法对气囊的缓冲过程进行了数值模拟及缓冲机理探讨,得到了缓冲过程中各动力学参数、运动学参数和能量的变化情况。结果表明,缓冲过程存在稳定波动、升压吸能、排气放能三个阶段。排气口面积越小,缓冲时间越长且可能导致反弹;而排气口面积过大,将导致系统卸压过快,缓冲性能降低。根据无人机过载随排气口面积的变化关系,获得了上述气囊缓冲系统的最佳排气口面积。In order to explore the influences of vent size on the cushioning performance of airbag, the finite element model of an airbag landing system for unmanned aerial vehicle was built in the paper. Based on the control volume method, the cushion processes with different vent areas were simulated to obtain the changes of kinematic and dynamic parameters and energy, while the cushioning properties of venting airbag were discussed. The result of simulation shows that there are three stages in the cushion process, which are stable fluctuation, energy absorption by rai- sing internal pressure and energy release by exhausting gas. It also confirms that the smaller the vent is, the longer time the process spends, and the more likely to rebound; while the bigger the vent is, the shorter time the process spends. Furthermore, too large vent has negative influence on the cushioning performance of airbag. Finally, the optimum vent size of 0. 041m^2 is obtained from the relationship between vent size and the maximum overload of unmanned aerial vehicle.

关 键 词：气囊 排气面积 缓冲过程 控制体积法 有限元 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] V279[自动化与计算机技术—计算机科学与技术]