关键词: 故障特征, 卷积型小波变换, 内积型小波变换, 频带分离, 信号处理

Abstract: The inner product type and convolution type of wavelet transformation are wavelet transformation’s two different modality and they have different processing effect for the same signal because their operational algorithm is different. In order to compare the frequency band separating effect and fault extraction effect of these two kinds of wavelet transformation, a bearing’s vibrating signal is processed by them respectively and their processing results in every scale are compared in detail. The analyzing results show that signal processing effect of convolution type of wavelet transformation has the advantage of that of inner product type one. Not only has it better frequency band separating effect, but also its ability to extract fault information is superior to that of inner product type of wavelet transformation. At last the theoretic analysis for this phenomenon is given.

Key words: Convolution type of wavelet transformation, Fault feature, Inner product type of wavelet transformation, Separation of frequency band, Signal processing