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

A technology for a steam turbine generator set and an identification method, which is applied to engine components, machines/engines, mechanical equipment, etc., can solve the problem of high dependence on analysis work, and cannot achieve automatic online monitoring of fluctuation type rubbing faults of steam turbine generator sets. Analyze and identify issues

Inactive Publication Date: 2012-05-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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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

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

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Embodiment Construction

[0039] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0040] figure 1 It is a flow chart of the real-time identification method for fluctuating rubbing faults of a turbogenerator set. figure 1 Among them, the real-time identification method for fluctuating rubbing faults of turbogenerator sets includes the following steps:

[0041] Step 1: Set the first duration T 1 =100 seconds, the second duration T 2 =30000 seconds, the step length t=1 second, so that the total length of the step is t sum =0.

[0042] In the actual implementation process, the second duration T 2 Can take 40000≥T 2 ≥30000 seconds. In addition, in order to determine whether a fluctuating rubbing fault occurs in the shafting of the unit, the first set value D 1 =15μm, the second set value D 2 =1...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02G01H17/00F01D21/14
Inventor 宋光雄
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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