复杂结构声辐射模态的计算

结构辐射阻矩阵的特征向量就是其声辐射模态,复杂结构的辐射阻矩阵获取困难阻碍了声辐射模态理论的进一步应用。为此提出一种基于等效源方法的复杂结构辐射阻矩阵计算方法,由此形成了一套完整的计算复杂结构声辐射模态方法。最后通过仿真算例对影响结构辐射阻矩阵计算精度的因素进行了分析,给出了复杂结构辐射阻矩阵构造的一般原则。理论推导和数值仿真算例表明所提出的复杂结构声辐射模态计算方法是有效的。该方法简化了复杂结构声辐射模态的计算,计算效率较高。

The calculation of acoustic radiation modes of the complicated structure

The difficulty in acquiring radiation resistance of the complicated structure has hindered the further application of the acoustic radiation modes theory based on eigenvalue decomposition of structure radiation resistance matrix. An approach to calculation of structure radiation resistance matrix based on equivalent sources method is proposed which can solve the inherent problems of the conventional computational method of acoustic radiation modes. Finally, the paper also analyses the factors which influence the calculation accuracy of radiation resistance matrix of the complicated structure with a simulation example and a general instruction principle of radiation resistance matrix of the complicated structure is presented. Theory derivation and simulation examples show that the computational method of acoustic radiation modes of the complicated structure proposed is valid. The proposed method simplifies the calculation of acoustic radiation modes of the complicated structure and its computation efficiency is higher.