机构地区: 中南大学信息科学与工程学院
出 处: 《计算机测量与控制》 2005年第1期18-20,共3页
摘 要: 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小波组合的滤波和包络检波方法。利用该方法,能方便地构造合适的组合小波,完成对振动信号的滤波和包络检波。工 程应用表明,该方法能非常有效地提取振动信号中的故障特征频率,具有良好的应用前景。 Morlet wavelet is plural exponent function enveloped by Gauss curve .The imaginary part of morlet wavelet is the result of Hilbert transform of real part and the wave figure is like as the figure of bell in frequency field. Inspired by these characters, we present the method of filter and envelope-demodulation based on combined morlet wavelets. It is very useful and convenient in the analysis of vibration signal. The feasibility and validity of the method has been validated by the engineering application.
领 域: [机械工程]