水下无人航行器折叠气囊充气展开特性模拟研究

为深入了解水下航行器助浮折叠气囊的充气展开行为，对水下环形折叠气囊的充气展开特性进行相关研究。基于初始矩阵法，建立环形助浮折叠气囊的有限元模型。基于控制体积方法，采用有限元分析软件LS-DYNA进行折叠气囊的展开仿真计算。通过与地面展开试验的初步对比，验证气囊环向折叠建模方法的有效性。考虑不同水深带来的外部压力效应不同，进一步分析充气压力、充气管径、水深、环境热交换等设计参数对水下折叠气囊展开过程的影响。结果表明：气囊极限工作深度随充气压力的升高而线性增加；充气时间随充气管径的增加而减小；环境与展开系统的传热作用主要发生在气囊与环境之间，在气囊与气瓶充气平衡后进行，气囊完全展开的时间随着传热系数增加而减小。

Simulation of Inflatable Deployment Characteristics of Folding Airbags for Underwater Unmanned Vehicle

In order to further understand the inflation and deployment behavior of buoyancy assisted foldable airbag for underwater unmanned vehicle (UUV)，the inflation and deployment characteristics of UUV annular foldable airbag are studied. The finite element model of annular folding airbag is established based on the initial matrix method. Based on the control volume method，finite element analysis software LS-DYNA is used to simulate the deployment of folding airbag. The validity of the method is verified by comparing with the ground experiment.Considering the different external pressure effects caused by different water depths，the influences of design parameters, such as inflation pressure， inflation pipe diameter，water depth and environmental heat exchange, on the deployment process of underwater foldable airbag are calculated and analyzed.The results show that the limit working depth increases linearly with the increase in inflation pressure，and the inflation time decreases with the increase in inflation diameter. The heat transfer between the environment and the deployment system mainly occurs between the airbag and the environment.After the airbag and the gas cylinder are inflated and balanced，the time of complete deployment of airbag decreases with the increase in the heat transfer coefficient.