小波分析及其在机械诊断中的应用

WAVELET ANALYSIS AND ITS APPLICATION IN MACHINERY DIAGNOSIS

从工程应用的角度提出了对于小波分析的理解，给出了小波函数和尺度函数之间的关系和信号分解的小波变换。利用小波包算法分析了两种典型的机械故障。结果显示，小波包的分析方法较传统的窗口傅里叶变换和维格纳分布更加有效。

To understand the wavelet analysis is put forward from engineering application . The relationship between wavelet function and scale function, the wavelet transfornn and the signal decomposition are given . Furthernnore, we take advantage of the algorit hm of wavelet packet to analyze two ki nds of typical mechanical faults . Results show the wavelet packet is a more efficient method in comparison with windowed fourier transform ( WFT ) and wigner distri - bution (WD) in the field of machinery diagnodis .