School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia.
J Acoust Soc Am. 2013 May;133(5):2668-77. doi: 10.1121/1.4796114.
A modal decomposition technique to analyze individual modal contributions to the sound power radiated from an externally excited structure submerged in a heavy fluid is presented. The fluid-loaded structural modes are calculated by means of a polynomial approximation and symmetric linearization of the underlying nonlinear eigenvalue problem. The eigenvalues and eigenfunctions of a fluid loaded sphere with and without internal structures are presented. The modal sound power contributions using both fluid-loaded structural modes and acoustic radiation modes are presented. The results for the resistive and reactive sound power obtained from the superposition of the individual modal sound power contributions are compared to the harmonic solution of the forced problem.
提出了一种模态分解技术，用于分析外激励结构在重流体中辐射声功率时各个模态的贡献。通过对基础非线性特征值问题进行多项式逼近和对称线性化，计算了流固耦合结构模态。给出了有和没有内部结构的流固耦合球体的特征值和特征函数。给出了使用流固耦合结构模态和声辐射模态的模态声功率贡献。通过对各个模态声功率贡献的叠加得到的电阻声功率和电抗声功率的结果与受迫问题的谐波解进行了比较。
