Real-time diagnosis method for random vibration fault of steam generator set

Abstract

The invention discloses a real-time random vibration fault diagnosis method for a turbo generator set, relates to the automatic on-line vibration state monitoring of the turbo generator set, and belongs to the fields of vibration state monitoring and fault diagnosis of large rotating machinery. The method comprises the following steps: acquiring bearing pedestal bush vibration signals and shaft vibration signals of a shaft system of the turbo generator set; performing necessary data preprocessing on the vibration data such as calibration conversion, abnormal point elimination and the like; adopting the Fast Fourier Transform (FFT) spectrum analysis method to perform relevance analysis between the bush vibration low frequency vibration and the shaft vibration on the vibration data, and further performing real-time quantitative computation and analysis on the bearing pedestal bush vibration data such as condition verification of low frequency vibration amplitude, the condition verification of the main frequency for the low frequency vibration, the dispersibility verification of low frequency vibration frequency components and the like, and automatically diagnosing in real time whether the random vibration fault occurs in the set by combining various verification results based on the real-time quantitative computation and analysis.

Description

technical field [0001] The invention belongs to the field of vibration state monitoring and fault diagnosis of large rotating machinery, and in particular relates to a random vibration fault real-time diagnosis method of a steam turbine generator set for automatic on-line monitoring of the vibration state of a steam turbine generator set. Background technique [0002] With the increase of unit capacity, some large turbo-generator units often show more obvious random vibration faults, and their frequency and amplitude fluctuations change significantly, and the manifestations are more complicated. The random vibration fault itself will not bring direct harm to the safe operation of the unit, but the random vibration will have an adverse effect on the long-term stable and reliable operation of the unit. [0003] (1) Random vibration can induce obvious harmful vibration. Because the frequency spectrum of random vibration is a continuous spectrum, the frequency band of exciting ...

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Problems solved by technology

For example, the axial random vibration of the bearing bush itself will not bring adverse effects on the safe operation of the unit, but because it is transmitted to the shaft system and amplified by the resonance of the wave joint coupling, it will produce obvious harmful vibration, which will cause a large wave joint. The alternating stress of the long-term operation of the wave section will cause fatigue damage and fracture, resulting in major production accidents of the unit

[0004] (2) Random vibration is an important symptom of serious vibration failure of the unit. If it is not dealt with in time, it will have an adverse effect on the safe operation of the unit

[0005] Usually, the diagnosis of unit random vibration faults is done by experienced experts, which has the disadvantages of high diagnostic cost, long period, low reliability and poor effectiveness

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