An online acoustic monitoring and diagnosis method for broken tooth fault of planetary gearbox

Abstract

An on-line acoustic monitoring and diagnosis method for broken teeth faults of planetary gearboxes. The method intercepts sound pressure signals of multiple working cycles of planetary gearboxes through shearing, filtering and normalizing preprocessing methods; uses multi-resolution singular value decomposition method to analyze The preprocessed sound pressure signal is decomposed, the optimal decomposition layer number is set, and multiple components are obtained through decomposition; according to the structure of the planetary gearbox, the theoretical fault characteristic frequency of broken teeth is calculated, and a reference signal is constructed based on this, and the autoregression is designed using the reference signal. The model selects the fault component from multiple components; performs envelope spectrum analysis on the fault component, calculates the amplitude ratio of the fault characteristic frequency spectrum line and the entire spectrum line, and sets the threshold value of the amplitude ratio. When the value is higher than the threshold, it indicates that the broken tooth fault occurs. The method only needs one sound pressure sensor to monitor and diagnose the state of the planetary gearbox accurately on-line, without additional measurement of other signals or the use of other monitoring devices, and the reliability of fault diagnosis 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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