A vibration signal separation method of planetary gearbox for fault diagnosis

Abstract

The invention discloses a planet gear box vibration signal separation method and system for fault diagnosis. The method comprises steps that (1) to-be-diagnosed planet gear box vibration signals are separated by utilizing an order tracking method to obtain harmonic components of gear box vibration signals, and the harmonic components comprise gear engagement vibration signals; (2) the gear engagement vibration signals are decomposed to a plurality of planet gears synchronously and averagely according to a continuous window function to obtain engagement vibration of a single planet gear so as to diagnose distributed abrasion of the planet gears; and (3) the harmonic components are subtracted from the to-be-diagnosed planet gear box vibration signals to obtain residual signals, the residualsignals only comprise impact signals and noise caused by local damage of the gears and bearings, the impact components in the residual signals are extracted through filtering, and monitoring and diagnosis of local damages of the parts are achieved. The method is advantaged in that gear box fault diagnosis accuracy can be improved.

Description

technical field [0001] The invention belongs to the technical field of planetary gearbox fault diagnosis, and in particular relates to a method for separating vibration signals of a planetary gearbox for fault diagnosis. Background technique [0002] Planetary gear transmission has the advantages of small size, compact structure, strong bearing capacity, and high transmission efficiency, and is widely used in heavy industries such as wind power generation, aerospace, ships, hoisting machinery, and metallurgical mining. However, the above-mentioned machinery and equipment usually operate under severe conditions of variable speed and variable load, and the components inside the gearbox are prone to failure and damage. Failure of parts will not only cause huge economic losses, but also become a major safety hazard. [0003] In the current planetary gearbox fault diagnosis, installing an acceleration sensor outside the gearbox casing to collect vibration signals to monitor the ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a planetary gearbox vibration signal separation method for fault diagnosis, in order to solve the problem that the gearbox vibration signal is complex and interferes seriously, which is not conducive to the fault diagnosis of planetary gearbox

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