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本文分析了Fourier变换和窗口Fourier变换的不足，给出了小波变换的时—频特性，阐述了小波变换用于故障诊断的可能性，指出了小波变换用于故障诊断的理论和方法．
This paper analyzes the shortcomings of Fourier transform and Fourier transform, presents the time-frequency characteristics of wavelet transform, expounds the possibility of wavelet transform for fault diagnosis and points out the theory and method of wavelet transform for fault diagnosis.