测量阵列布置对基于源强分布声辐射模态的平面噪声源识别的影响

摘要

This paper has offered the formula of noise source identification based on source strength distribution acoustic modes ,analyzed the sensitivity of the results to the number of conditions of the field distribution matrix ,and focused on the investigation into the factors which influence the condi-tions of the field distribution matrix for a planar acoustic source .The analysis results show that the square array which is in parallel with and close to the source plane with a gap between the micro -phones equal to that between the equivalent sources is an optimum measurement array .The acoustic experiment result shows that the use of the optimized measurement date of the array leads to a satis -factory identification effect .%基于源强分布声辐射模态理论给出了结构噪声源识别公式，分析了识别结果对声场分布模态矩阵条件数的灵敏度，并以平板声源为例对影响声场分布模态矩阵条件数的因素进行了重点分析。分析结果表明：与源面平行，传声器间距与等效源间距相等且测量面靠近源面的方阵是最优布置测量阵列，而且这种布置方式可有效提高声场分布模态矩阵条件数。同时，音箱实验结果表明：利用优化后的测量阵列测量数据取得了良好的识别效果。