高频射流噪声测量及修正方法研究

为了提高射流远场噪声高频测量的精度，基于严格的射流噪声模拟试验装置，采用试验测量的方法，对影响射流噪声高频测量的因素进行了系统研究。具体研究包括传声器指向性、传声器频率响应特性、传声器保护罩、传声器本底噪声以及空气吸声效应等因素对射流噪声高频测量的影响。对各影响量进行了试验对比及量值分析，给出了射流噪声高频测量及修正的建议和方法。通过试验对比研究，给出了射流噪声远场测量边界的建议。

Measurement and correction of high frequency jet noise

In order to improve the accuracy of high frequency measurement of jet far field noise, the factors affecting the high frequency measurement of jet noise have been systematically studied based on the experimental method of the strict jet noise simulator test equipment. These factors contain: the directivity of microphone, the frequency response characteristics of microphone, the influence of microphone protective cover, the noise floor of microphone and the effect of atmospheric absorption, etc. The experimental comparison and quantitative analysis of each influence factor have been carried out. Recommendations and correction methods for high frequency jet noise measurement are given. Finally, the location of geometric far field, which is very important for the accurate measurement of the high frequency radiation characteristics of far field jet noise, is proposed based on experimental measurement results.