一种识别声源噪声辐射区域的方法

摘要

For the acoustic radiation problems of large scale vibrating structure, a method based on acous-tic radiation modes is proposed to identify the noise radiation regions on the structure. To identify the noise radiation regions on the surface of acoustic source, the contributions of acoustic radiation modes to radiated sound power are analyzed, and the main acoustic radiation modes, which have the most contribution to the radiated sound power, are selected. By the selected acoustic radiation modes, the velocities on the surface are reconstructed. The identification of noise radiation regions is realized by the reconstructed result of the velocities. The validity of the proposed method is validated by numerical simulating for the noise radiation regions of a rectangular plate at several frequencies. The proposed method has a positive significance for identifying the noise radiation regions of acoustic source and further reducing the radiation noise in the far-field.%针对大型结构体的声辐射问题,提出了一种利用声辐射模态识别声源表面的噪声辐射区域的方法.分析了各阶声辐射模态对声源的辐射声功率的贡献量,找出了对远场辐射声功率贡献最大的几个主要的声辐射模态,然后利用这几个主要的声辐射模态重建声源表面法向振速,通过声源表面法向振速的重建结果实现了声源表面噪声辐射区域的识别.通过对平板声源在几种不同频率下的噪声辐射区域的仿真分析验证了文中方法的正确性.该文方法对于确定特定频率下声源表面的噪声辐射区域,从而进一步进行辐射噪声控制具有积极的意义.