多级可分离式AUV系统设计与仿真分析

Design and CFD simulation analysis of a multistage separable AUV

多级可分离式自主水下航行器(MS-AUV)可搭载多种不同功能的载荷舱,并在目标海域完成载荷舱布放。其在海洋探测,海防等领域具有较高的应用价值。对MS-AUV进行了主体结构和分离机构的设计和研究,其中功能载荷舱与航行器本体采用真空连接方式,实现多级连接,降低了机构的复杂性,提高了载荷舱分离运动的稳定性和安全性。为了研究载荷舱与航行器分离的安全性,采用CFD和六自由度(6-DOF)刚体运动学的耦合方法来模拟其在水下的分离运动。在仿真过程中,采用弹簧光顺和局部重构混合网格生成方法的非结构化动态网格可以很好地适应大距离多体分离运动。仿真结果表明,在一定工况条件下,提高MS-AUV初始航行速度V0和分离机构弹簧刚度K有利于载荷与航行器本体分离。通过上述研究工作,验证了载荷分离方法的可行性,缩短研制周期,降低设计成本,对多级可分离式AUV样机的设计制造具有重要的参考价值。

The multistage separable autonomous underwater vehicle (MS-AUV) can carry a number of different functional loads and separate the loads in the target area. The separation system and configuration of MS-AUV are designed and studied in this paper. The payload cabin and the body adopt vacuum connection, which reduces the complexity of the mechanism and improves the stability and safety of the separation movement of the payload cabin. In order to analyze the safety of load separation, the coupling method of CFD and six degrees of freedom (6-DOF) rigid body kinematics are used to simulate the separation motion. In CFD simulation, the unstructured dynamic mesh with spring-remeshing hybrid mesh generation method can well adapt to large-distance multi-body separation motion. The simulation results demonstrate that increasing the initial sailing speed V 0 of the MS-AUV and the spring stiffness K of the separating mechanism is beneficial to the separation of the load from the aircraft body under certain working conditions. Through the above research work, the feasibility of the payload separation method is verified. It has important reference value for the design and manufacture of multi-stage separable AUV prototype.