基于 Ansys/LS-DYNA的缓冲气囊着陆过程仿真研究

目的以冲压式快速空投硬式气囊为研究对象,对气囊以特定角度着陆时的缓冲过程进行仿真分析。方法使用SolidWorks软件建立气囊的仿真模型,然后使用Ansys/LS-DYNA有限元分析软件,分别从气囊的材料定义、有限元模型的构建和仿真结果分析等方面进行仿真研究,并得出冲压式快速空投气囊着陆过程中应力应变的动态参数,以及货物和气囊的冲击加速度波动曲线。结果气囊在偏离竖直轴15°着陆缓冲过程中,在0.077 207 s时,地面与气囊的棱接触处受到的最大应力为1.47MPa,此时对应的最大应变为0.479 614 m。结论冲压式快速空投气囊在偏离竖直轴15°着陆时,气囊所受的最大冲击应力以1.47 MPa为标准,可更好地确定空投物体的质量,并且可以针对性地加强对气囊应力应变较大区域的防护,防止气囊在冲击过程中破坏。

Simulation Research of the Cushioning Airbag during the Landing Process Based on Ansys/LS-DYNA

Objective This paper took a punched quick airdrop airbag as the research object, and simulated its cushioning process during the landing process at a certain angle. Methods The paper established a simulation model of the airbag through SolidWorks software and used the finite element analysis software Ansys/LS-DYNA to simulate the landing process from the aspects of airbag material definition, construction of finite element model and simulation results analysis. The dynamic parameters of the stress and strain of the airbag during the landing process of the punched quick airdrop airbag as well as the impact acceleration curve of the goods and airbag were obtained. Results During the landing process of the punched quick airdrop airbag with 15° deviation from the vertical shaft, the maximum stress value of the airbag was 1.47 MPa and the corresponding maximun strain value was 0.479 614 m at the contacting edge of the airbag with the ground at 0.077 207 s. Conclusion When the punched quick airdrop airbag landed at an angle of 15° deviated from the vertical shaft, the biggest impact should use 1.47 MPa as a standard. As a result, the mass of airdrop body can be better specified, and the protection of the area with great stress and strain to the airbag from being damaged during the process of impact could be strengthened.