Planetary gearbox fault diagnosis method under time-varying rotating speed based on POVMD and FDTW

Abstract

The invention provides a planetary gearbox fault diagnosis method under a time-varying rotating speed based on POVMD and FDTW, and belongs to the technical field of rotating machinery fault diagnosis and vibration signal analysis. Unlike a previous order tracking technology without a rotation speed measuring device, according to the present invention, an original time scale is projected onto a new time scale by twisting a measured vibration signal at the time-varying rotation speed, wherein the time-varying speed of a shaft is extruded towards a constant reference speed, so that on the transformed time scale, the fuzzy frequency spectrums of the frequencies change along with the speed are extruded into respective independent peak values, and the required shaft rotating speed information is not required to be accurate, and accordingly the gear and bearing fault information of a planetary gear box under the time-varying rotating speed can be accurately identified.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis and vibration signal analysis of rotating machinery, and relates to a fault diagnosis method for rotating machinery, in particular to a parameter optimization variational mode decomposition method based on parameter optimization variational mode under time-varying rotating speed and when there is no rotating speed measuring device. decomposition, POVMD) and fast dynamic time warping (Fast dynamic time warping, FDTW) methods for planetary gearbox fault diagnosis methods, which can be used for fault diagnosis of gears and bearings in planetary gearboxes. Background technique [0002] Planetary gearboxes have the advantages of small size, large transmission ratio, strong bearing capacity, stable operation and high work efficiency, and have been widely used in large and complex mechanical equipment such as helicopters, wind power, heavy trucks and ships. However, the planetary gearbox, as the ...

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Problems solved by technology

[0005] In view of the blurring of the frequency spectrum caused by the time-varying rotational speed of the above-mentioned planetary gearbox, which leads to the problem that the fault information cannot be accurately obtained and the time-frequency resolution based on the time-frequency image is not high, resulting in the problem that the rotational speed information cannot be accurately obtained. The present invention provides a A fault diagnosis method based on parameter-optimized variational mode decomposition and fast dynamic time warping (POVMD-FDTW), which overcomes the above-mentioned shortcomings

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