Tachometer-free planetary gearbox compound fault diagnosis method under time-varying working condition

Abstract

The invention discloses a tachometer-free planetary gearbox compound fault diagnosis method under a time-varying working condition. The tachometer-free planetary gearbox compound fault diagnosis method comprises the steps of collecting a planetary gearbox fault vibration signal under the time-varying working condition; performing adaptive modal decomposition on the fault vibration signal, calculating a Gini index GI value of each modal component, and selecting the modal signal with the maximum Gini index GI value as a sensitive component; an IDMM trend line is extracted from short-time Fourier transform (STFT) time-frequency representation of the collected fault vibration signals, and the IDMM trend line is equivalent to the rotation frequency of the reference axis; performing angular domain resampling on the sensitive component based on the equivalent reference axis rotation frequency to obtain a stable angular domain signal; carrying out deconvolution processing on the angular domain signal; and envelope demodulation processing is carried out on the angular domain signal after deconvolution to obtain an envelope spectrum, and fault feature order information is extracted from the envelope spectrum and compared with a theoretical value, so that the fault type of the planetary gearbox is accurately judged. By applying the embodiment of the invention, the accuracy and robustness of diagnosis are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis and vibration signal analysis and processing of rotating machinery, in particular to a compound fault diagnosis method for a planetary gearbox without a tachometer under time-varying working conditions. Background technique [0002] Planetary gearboxes have the advantages of stable transmission, large reduction ratio, high work efficiency and strong carrying capacity, and have been widely used in large and complex mechanical equipment such as wind turbines, helicopters, ship unloaders, stackers and reclaimers, and ships. However, in engineering practice, planetary gearboxes usually serve in harsh environments such as high load, strong impact, high pollution, and frequent changes in working conditions, which can easily lead to simultaneous failure of different components in the planetary gearbox, that is, compound failures. When a compound fault occurs in a planetary gearbox, different type...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for diagnosing compound faults of a planetary gearbox without a tachometer under time-varying conditions, so as to solve the problem that it is difficult to accurately diagnose the compound fault of a planetary gearbox with a time-varying speed in a scene without a tachometer, and the ACMD algorithm is used in When using it, it is necessary to preset the initial instantaneous frequency and the determination of key parameters in the CYCBD algorithm lacks the problem of self-adaptation

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