应用小波分析提取故障诊断信号的特定频段

在总结小波分析对信号特定频段提取技术(定义方法、组合小波方法、多分辨率分析方法、小波包方法)，以及对这些技术的有效件、适应性进行比较的基础上，通过仿真试验实现了对合成信号的频率分解，达到和FFT相类似的效果，同时，把基于小波分析的频段提取技术应用到旋转机械的故障诊断中，分析结果表明该技术可以有效地实现有用频段的提取和干扰频段的抑制。

Extraction of Fault Diagnosis Signal''''s Frequency Band with Wavelet Analysis

Based on summing up the branch methods of wavelet analysis(such as definition method,combination wavelet method,multi-resolution analysis method,wavelet packet method)and comparing their effectiveness and practicability,via computer simulation,the frequency decomposition of synthesized signal for extration of special frequency band with wavelet transformation is studied and the object,similar to that of FFT,is achieved.The frequency band extration approach is then applied to the fault diagnosis of rotating machinery and the purpose of attenuating the disturbance signal is fairly realized.