Application of Reassigned Spectrogram and Multiple Window Spectruminto Mechanical Fault Diagnosis

Mao Yongfang Qin Shuren Qin Yi

Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (1) : 161-165.

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PDF(1850 KB)
Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (1) : 161-165.
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Application of Reassigned Spectrogram and Multiple Window Spectruminto Mechanical Fault Diagnosis

  • Mao Yongfang Qin Shuren Qin Yi
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Abstract

Reassigning the spectrogram is able to enhance the time frequency concentration of the spectrogram and reduce the cross-term, however, it causes great estimation variance. Multiple window spectrum is of satisfying estimation accuracy, while poor of time frequency concentration. Combining the two methods enables to further enhance the readability of the spectrogram. The method of combined reassigned spectrogram and multiple window spectrum is adopted to analysis the fault signal of a shaft, a gear box and a bearing, and the results is compared with that of reassigned spectrogram, which shows the method is of good time frequency concentration, small estimation variance, able to remove the noise in the signal and reduce the cross-term, hence doing better in mechanical fault diagnosis.

Key words

Spectrogram / Reassignment / Multiple window spectrum / Fault diagnosis

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Mao Yongfang Qin Shuren Qin Yi . Application of Reassigned Spectrogram and Multiple Window Spectruminto Mechanical Fault Diagnosis[J]. Journal of Vibration and Shock, 2009, 28(1): 161-165
PDF(1850 KB)

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