Doppler distortion removal based on reassignment operator and SST for the wayside acoustic signal recovery and fault diagnosis of train bearings

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (6) : 11-17.

XIONG Wei,ZHANG Haibin,HE Qingbo,KONG Fanrang

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Abstract

The phenomenon of Doppler distortion in the acoustic fault signal of moving train needs to be regulated during signal preprocessing.A Doppler distortion removal method based on ROSST (Reassignment Operator Synchro Squeezing Transform) was proposed to solve the problem,and was applied to the wayside fault diagnosis of moving train bearings.The time-frequency distribution with high resolution was obtained by using the ROSST.A resampling method was then carried out to remove the Doppler distortion based on the ridge extraction,Morse acoustic theory and nonlinear data fitting.A simulation signal and experimental acoustic signals of train bearing with defects on the outer race and inner race were utilized to verify the availability.The results indicate the effectiveness of the proposed method.

Key words

reassignment operator / synchrosqueezing transform / Doppler distortion / train bearings fault diagnosis

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XIONG Wei,ZHANG Haibin,HE Qingbo,KONG Fanrang. Doppler distortion removal based on reassignment operator and SST for the wayside acoustic signal recovery and fault diagnosis of train bearings[J]. Journal of Vibration and Shock, 2017, 36(6): 11-17

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