一种利用波叠加法计算声辐射模态的新方法

A new acoustic radiation mode calculation method based on wave supposition method

针对目前对于复杂结构的声辐射模态尚无简便计算方法的问题,利用波叠加法提出了一种适合复杂结构声辐射模态计算的方法。该方法通过波叠加法建立了辐射结构内部等效点源与表面法向振速的关系,得到了辐射阻抗矩阵的表达式,有效解决了一般方法在求解辐射阻抗矩阵时存在的困难。在此基础上,对辐射阻抗矩阵进行特征分解得到复杂结构的声辐射模态,并通过数值计算证明了该方法的有效性。

Acoustic radiation mode（ARM）is a powerful tool in sound radiation analysis.However,there are no effective methods in the ARM calculation for arbitrary radiation structures.To solve the problem,a new ARM calculation method is proposed based on wave supposition method.Firstly,the relationship between the equivalent sources and the normal velocity is built according to the wave supposition method,and then the radiation impedance matrix is obtained by which problems in radiation impedance matrix calculation are solved.Finally,ARM of arbitrary radiation structure can be calculated by eigenvalue decomposition.Numerical calculations are performed and the effectiveness of the proposed method is proved by the calculation results.