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小波变换具有优良的时频分析特性，利用小波变换提取周期信号中的微弱瞬态冲击非常有效。为了消除ＭＡＬＬＡＴ算法中的频率混淆，本文提出了一种改进的二进离散小波变换快速算法，并成功地利用小波变换提取了某型涡喷发动机滚珠轴承的早期故障特征，实现了傅立叶变换所达不到的效果。
Wavelet transform with excellent time-frequency analysis of characteristics, the use of wavelet transform to extract weak periodic signals in the transient impact is very effective. In order to eliminate the frequency aliasing in MALLAT algorithm, an improved fast algorithm of binary discrete wavelet transform is proposed in this paper. The wavelet transform is used to extract the early failure characteristics of a ball-scroll engine’s ball bearing. The Fourier transform Not the effect.