On-line acoustic monitoring and diagnosis method for tooth breakage faults of planetary gearbox

Abstract

The invention discloses an on-line acoustic monitoring and diagnosis method for tooth breakage faults of a planetary gearbox. The method comprises the following steps: intercepting sound pressure signals of a plurality of working cycles of the planetary gearbox through shearing, filtering and normalization preprocessing methods; decomposing the preprocessed sound pressure signal by using a multi-resolution singular value decomposition method, setting an optimal decomposition layer number, and obtaining a plurality of components through decomposition; calculating a tooth breakage theoretical fault characteristic frequency according to the structure of the planetary gearbox, constructing a reference signal based on the fault characteristic frequency, and selecting a fault component from a plurality of components by utilizing an autoregression model designed by the reference signal; and performing envelope spectrum analysis on the fault component, calculating an amplitude ratio of a fault characteristic frequency spectral line to a whole frequency spectrum spectral line, setting an amplitude ratio threshold value, and when the calculated amplitude ratio is greater than the amplitude ratio threshold value, indicating that a tooth breakage fault occurs. According to the method, the state of the planetary gearbox can be monitored and accurately diagnosed on line only through one sound pressure sensor, other signals do not need to be additionally measured or other monitoring devices do not need to be adopted, and the fault diagnosis reliability is high.

Description

technical field [0001] The invention relates to the technical field of acoustic monitoring and fault diagnosis of planetary gearboxes, in particular to an on-line acoustic monitoring and diagnosis method for broken teeth faults of planetary gearboxes applied to actual construction machinery systems. Background technique [0002] As the core equipment of the mechanical system, the working state of the planetary gearbox is related to the safe and stable operation of the entire mechanical system. The online monitoring and diagnosis system of planetary gearbox can help users find faults and eliminate them in time. It plays an important role in ensuring the stable and safe operation of mechanical systems. The traditional planetary gearbox monitoring technology is mainly vibration monitoring technology, which has been widely used in mechanical equipment systems such as motors, rails, automobiles, and machine tools, and has achieved good fault diagnosis results. Gearbox fault diag...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an online acoustic monitoring and diagnosis method for broken teeth of planetary gearboxes aimed at solving the technical problems existing in the existing acoustic monitoring and diagnosis technology in monitoring and diagnosing the operating state of complex planetary gearboxes, aiming to solve how to timely and accurately Judging the technical problems of the planetary gearbox operating status and maintenance needs, so as to provide an accurate reference for the maintenance and replacement of the planetary gearbox

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