Method for identifying fluctuation rub-impact fault of turbo generator set in real time

Abstract

The invention discloses a method for identifying a fluctuation rub-impact fault of a turbo generator set in real time in the technical field of vibrational state monitoring and fault diagnosis of rotating machinery. The method comprises the following steps of: calculating and storing over-all vibration amplitude value data at intervals of one stepping length; after a first time length is reached, acquiring the maximum values of the stored over-all vibration amplitude value data; after a second time length is reached, arranging the maximum values of the over-all vibration amplitude value data to form an over-all vibration amplitude value extreme value sequence; solving the difference of the maximum value and the minimum value of the over-all vibration amplitude value extreme value sequence; calculating the ratio of every numerical value in the over-all vibration amplitude value extreme value sequence to the maximum value of the over-all vibration amplitude value extreme value sequence and forming a ratio sequence; calculating change peakness parameters of the ratio sequence, and the sum of the difference of the ratio sequence and the difference of the ratio sequence; and judging whether the axis of the set has the fluctuation rub-impact fault or not according to the obtained result. Real-time automatic on-line monitoring of vibration data of a bearing pedestal is realized, and efficiency and accuracy of fluctuation rub-impact fault real-time analysis of the turbo generator set are improved.

Description

technical field [0001] The invention belongs to the technical field of vibration state monitoring and fault diagnosis of rotating machinery, and in particular relates to a real-time identification method for fluctuating rubbing faults of a steam turbine generator set. Background technique [0002] Rubbing between rotating parts and stationary parts of large turbogenerator sets is a common fault in operation. As the efficiency requirements of large-scale units continue to increase, the dynamic and static gaps become smaller, and the possibility of rubbing failures increases. At present, the incidence of rubbing vibration faults of large units is second only to the incidence of mass unbalance faults, and has become the second largest type of vibration faults of units. Rubbing causes the rotor to produce very complex movements. In mild cases, the unit will vibrate strongly, and in severe cases, it may cause permanent bending of the rotating shaft, or even destroy the entire sh...

AI Technical Summary

Problems solved by technology

[0003] Usually, the analysis of fluctuating rubbing faults of large steam turbine generator sets is completed by professionals with certain field operation experience through the analysis of vibration data, which brings about the problem that the analysis work is highly dependent on professionals, and cannot be done Real-time automatic online monitoring, analysis and identification of fluctuating rubbing faults of steam turbine generator sets

Images