雷达天线系统离心风机气动噪声研究

基于FW-H方程,对离心风机进行气动声学理论分析,结合噪声测试方法,对某雷达天线系统进行噪声试验研究分析.测试数据表明,噪声和振动加速度频谱图分布较为接近,噪声振动能量峰值频率均为离心风机叶片基频的倍频,即雷达天线系统噪声主要来源于离心风机的气动噪声.通过改变均热板上翅片与风机叶片边缘的间距和调节风机转速,对单个离心风...

Study on aerodynamic noise of centrifugal fan in radar antenna system

Based on FW-H equation,the aeroacoustic theory of centrifugal fan was analyzed,and the noise test of a radar antenna system was carried out in combination with the noise test method.The test data show that the frequency spectrum of the noise and the vibration acceleration was close to each other,and the peak frequency of the noise and vibration energy was the frequency multiplication of the fundamental frequency of the centrifugal fan blade,that is,the noise of radar antenna system mainly comes from the aerodynamic noise of the centrifugal fan.By changing the spacing between the fins of the vapor chamber and the edge of the fan blade and the rotating speed of the fan,the noise test of a single centrifugal fan was carried out.The experimental results show that the noise decreases with the increase of spacing,and the noise energy is gradually concentrated in the low frequency region.The noise of centrifugal fan increases with the increase of its speed,and the noise energy of the centrifugal fan is the largest at the double frequency of its blade fundamental frequency under different working conditions.The noise image of the centrifugal fan under different working conditions obtained by the noise reduction test can provide the experimental and theoretical basis for the optimization design of the vapor chamber structure of the radar antenna system.