【摘要】 为保证海洋捕捞作业水下航行器的安全高效运行,水下航行器工作时应避免受自身发动机影响,与外壳发生振动从而激励外场海水介质形成辐射声场.基于声固耦合理论,针对水下航行器工作环境的特殊性与空气中干模态,采用更加复杂的湿模态分析方法.将流体视为可压缩的声学介质,利用ANSYS分析软件模拟航行器在水中的真实悬浮状态.求解出前十阶湿模态,确定航行器的固有频率和振型,对其结构进行分析,以提高刚度,增加稳定性,避免共振现象.研究结果为进一步优化航行器外形结构设计及提高其工作性能提供理论基础.更多还原

【Abstract】 In order to ensure the safe and efficient operation of the underwater vehicle for marine fishing operations, the underwater vehicle should avoid being affected by its own engine and vibration with the outer shell, so as to excite the seawater medium in outfield to form a radiated sound field. Based on the acoustic-structure coupling theory, a more complex wet-mode analysis method was adopted for the particularity of the underwater vehicle working environment and the dry mode in the air. The fluid was regarded as a compressible acoustic medium, and the real suspension state of the vehicle in water was simulated by ANSYS analysis software. The first ten wet modes were solved, the natural frequencies and mode shapes of the aircraft were determined, and the structure was analyzed to improve stiffness, increase stability, and avoid resonance. The results provided a theoretical basis for further optimizing the shape and structure design of the aircraft and improving its working performance.更多还原