水下无人航行器折叠气囊充气展开特性模拟

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.