Morlet组合小波在颤振试飞中的应用

Morlet小波是高斯包络下的复指数函数,利用其虚部是实部的Hilbert变换,频域波形为钟形的特征,提出了基于Morlet组合小波的滤波方法。利用该方法,能方便地构造合适的Morlet组合小波,完成对飞行颤振试验响应信号的滤波,并保证滤波后相位不变。通过数字仿真研究了其方法的有效性,工程应用表明,该方法能够有效滤除飞行颤振试验响应信号的噪声,具有良好的应用前景。

Morlet Combined Wavelet Analysis and Its Application in the Flight Flutter Test

The Morlet wavelet is the complex-exponential function with gauss function wave.Making use of the imaginary part being the Hilbert transform of the real part and the frequency character of "bell shape",this paper presented the Morlet combined wavelet filtering method.Making use of the method, the proper Morlet combined wavelet can be constructed conveniently for completing the filtering of flight flutter test response.The method ensures that the phase do not distort after filtering.The paper studied the validity of the method through the numerical simulation.The project application indicated that the method could get rid of the noise of the flight flutter test response effectively and had great application potential.