利用源强分布声辐射模态识别噪声源

为了解决噪声源识别中存在的识别精度不高、分辨率受限、对测量条件要求高等问题,提出了基于源强声辐射模态的噪声源识别方法。该方法首先计算结构的源强声辐射模态矩阵和声场分布模态矩阵,然后利用声场中测得的声压数据向量与结构声场分布模态矩阵的关系求出声辐射模态展开系数向量,最后通过声辐射模态矩阵和声辐射模态展开系数向量的积就可得到结构的源强分布,从而达到对噪声源识别的目的。该方法利用较少的测量点可以获得较高分辨率和识别精度。通过平板振动仿真和音箱实验验证了该方法对平面结构噪声源识别的有效性。

The method of identification of the noise source based on source strength distribution acoustic radiation modes

In the identification of the noise source, to solve the problems of poor identification accuracy, low computational efficiency, limited resolution, rigorous measurement equipment request, the method of identification of the structure noise source based on source strength distribution acoustic radiation modes is proposed. Firstly, source strength distribution acoustic radiation modes and sound field distribution modes of the structure are obtained, then expansion coefficients vector of acoustic radiation modes is determined through the relationship of the pressure vector measured in the sound field and its corresponding structural sound field distribution modes matrix, finally, the structure noise source is identified by means of the product of acoustic radiation modes matrix and expansion coefficients vector of acoustic radiation modes vector. This method may obtain nice resolution and good identification accuracy. The simulation results and the experimental results show that the method proposed can provide good results.