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Affiliation of Author(s):自动化学院

Title of Paper:Fault Diagnosis of Planetary Gearboxes Based on NLSTFT Order Tracking under Variable Speed Conditions

Journal:Zhongguo Jixie Gongcheng

Abstract:Aiming at the problems that vibration signal frequencies of planetary gearboxs were fuzzy and interfered by strong noises under variable speed conditions,a fault diagnosis method was proposed based on NLSTFT non-bonding phase order tracking and variational modal decomposition. Firstly,NLSTFT was used to precisely estimate instantaneous frequency of vibration signals,and then transformed into the instantaneous phase curves through integral operation. A smooth angular domain signal was obtained by signal resampling. Secondly,NCOGS(non-convex overlapping group shrinkage) algorithm was used to de-noise the angular domain signals,and VMD(variational mode decomposition) algorithm was used to perform modal decomposition of the angular domain signals. Finally,the fault diagnosis was realized through the demodulation analysis of the envelope spectrum of each modal component signal. The experimental results show that the new method may effectively promote the performances of fault diagnosis under variable speed conditions,which has the high computational efficiency and strong noise robustness. © 2018, China Mechanical Engineering Magazine Office. All right reserved.

ISSN No.:1004-132X

Translation or Not:no

Date of Publication:2018-07-25

Co-author:Jun Wang,Huang, Haian

Correspondence Author:wang you ren