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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
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Abstract: The traditional short-time Fourier transform and wavelet transform could not have high time resolution and frequency resolution at the same time in time-frequency analysis.Aiming at this problem,a gearbox fault identification method based on the second-order synchronous extrusion transformation was proposed.Firstly, the good signal extraction effect of the second order synchronous extrusion transform in time-frequency analysis was tested, through the analog signal containing the upper and lower frequency bands.The noise resistance of the second order synchronous extrusion transform was tested by adding white Gaussian noise.Then taking an active subway gearbox in China as the research object, a computer virtual prototype was constructed by software, and a rigid-flexible coupling model was generated by finite element software with the box as a flexible body and the transmission system as a rigid body. The vibration acceleration signals of measuring points of the gearbox with broken teeth and the gearbox in normal state were obtained.Finally, the meshing frequency, side frequency band and the meshing frequency in normal gear operation were identified by the second order synchronous extrusion transformation.The results show that the secondorder synchronous extrusion transform has better time-frequency resolution than the synchronous extrusion transform and the traditional time-frequency analysis method, which provides a reliable tool for the subsequent measurement and signal identification of subway vibration signals.
Key words: gearboxfault identification; fault diagnosis; second order synchronous extrusion transform; vibration signal
HUANG Xiao-dan, PEI Bang, LI You-hua, et al.Fault identification of gearbox based on second order synchronous extrusion transform[J].Journal of Mechanical & Electrical Engineering,2021,38(12):1605-1610.
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