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Affiliation of Author(s):能源与动力学院

Title of Paper:Time-frequency ridge fusion method and defective identification of planetary gearbox running on time-varying condition

Journal:Zhendong Gongcheng Xuebao

Abstract:Planetary gearboxes often run under time-varying conditions, thus resulting in nonstationary signals. The accurate extraction of the reference shaft rotational speed is a key issue of planetary gearbox fault diagnosis. The conventional time-frequency ridge detection algorithms make a poor robustness for tracking the target time-frequency ridge due to the amplitude variation and noise buried in the raw vibration signal. In order to solve this problem, a bidirectional search time-frequency ridge fusion method is proposed, which could be further promoted into the fusion about the multiple time-frequency ridges. A vibration signal of planetary gearbox in practical engineering is used to validate the proposed method. As a result, the rotational speed of its high-speed shaft is effectively extracted by comparing with two conventional methods. Additionally, the order analysis is utilized to process the signal based on the extracted rotational speed. It is verified that the extracted rotational speed hasgood accuracy. Finally, with the expression of planet bearing faulty frequency, the inner race defect of the planet bearing is identified from the order spectrum. © 2017, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.

ISSN No.:1004-4523

Translation or Not:no

Date of Publication:2017-02-01

Co-author:Jiang, Xing-Xing,Zhou, Dong-Wang,Chen, Yuan-Fan,Shi, Juan-Juan

Correspondence Author:lsz