模态分析在确定尾流中气泡谐振频率的应用

Application of Modal Analysis on the Determination of Resonant Frequency of Bubbles in the Ship Wake

舰船尾流的声学特性由分布在尾流中气泡的声学特性决定。气泡的声学特性表现在对不同频率入射声波的反射和散射作用,主要由气泡的谐振频率决定。有限元分析中模态分析可以分析振动结构,得到物体结构的谐振频率。根据尾流中气泡的声学特性,建立气泡声学特性结构模型,用模态分析方法确定气泡的谐振频率以验证模型的正确性,将有限元方法引入分析舰艇尾流的声学特性中。

The acoustic characteristic of the ship wake is mainly determined by that of the bubbles in it. The acoustic characteristic of bubbles is behaved as the reflection and scattering of different frequency of sound waves, which is mainly up to the resonant frequency of the bubble. The modal aralyze method in the finite-element theory can be used to analyze the vibration of structure and obtain the intrinsic frequency of some structures in the result file. The application of the modal analysis on the model can prove the correction of the model, which can be used to study the acoustic characteristic of the ship wake.