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基于小波变换研究了典型飞行状态下直升机噪声所具有的特征．通过对直升机噪声信号小波细节的描述，使我们了解到桨涡干扰噪声分量对直升机噪声的贡献，并能够清楚地观察到直升机噪声的低频拍振荡现象．
The characteristics of helicopter noise under typical flight conditions are studied based on wavelet transform. By describing the details of the wavelet of the helicopter noise signal, we know the contribution of the noise component of the propeller noise to helicopter noise and clearly observe the low-frequency beat oscillation of the helicopter noise.