螺旋桨旋转噪声等价声源中心的实验研究

Experimental Study of the Equivalent Sound Source Center of the Propeller Rotating Noise

本文研究了互谱分析法在噪声源定位应用上的理论和实验技术。为了得到用于噪声控制的螺旋桨旋转噪声的等价声源中心,研究涉及到互谱分析法的理论以及时间平均和空间平均的实验技术。这是一种工程方法。该方法可用于识别各种螺旋浆旋转噪声的等价声源中心,且可推广到其他声源的声源定位、声源识别领域。作为实例,识别AD—200轻型飞机的螺旋桨旋转噪声等价声源中心的测量取得了非常好的结果。 另外,本文对互谱分析法在声源定位上应用的有效性进行了理论分析,指出互谱分析法在声源定位方面有着广阔的应用前景。

In this paper,the theory and the experimental technique about the identification of a noise source using a cross-spectrum analysis method have been studied. In order to obtain the equivalent sound source center of a propeller rotating noise for noise control,the investigation is concerned with the theory based on a cross-spectrum method and the experiment based on time average and space average. It is an engineering method which can be used to identify the equivalent sound source center of various propeller rotating noise and can be extended to other sources. As an example,the measurement of the equivalent sound source center of the propeller rotating noise on the light aircraft AD-200 has been carried out and the results of the measurement are satisfactory.In addition, the efficiency of the cross-spectrum method to indentify sound source has been discussed theoretically. The use of the cross-spectrum analysis method has extensive prospects in the identification of sound sources.