Real-time identification method for oil whirl fault of turbo generator set
A technology for a steam turbine generator set and an identification method, which is applied in vibration testing, testing of machine/structural components, measuring devices, etc., and can solve the problems of high degree of subjectivity, poor objectivity, and monitoring of experts.
Inactive Publication Date: 2011-09-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0004] At present, the oil film whirl fault identification of turbogenerator needs to be completed by experts with certain experience in on-site vibration fault diagnosis by observing the three-dimensional spectrum diagram, which is poor in objectivity, highly dependent on the subjectivity of experts, and cannot be done Real-time automatic online monitoring, analysis and discrimination of unit rotor oil film whirl fault identification
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[0042] 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.
[0043] figure 1 It is a flow chart of the real-time identification method for the oil film whirl fault of the turbo-generator set. figure 1 Among them, the real-time identification method for the oil film whirl fault of the turbogenerator set provided by the present invention includes the following steps:
[0044] Step 1: Set the duration T=200 seconds, the step length t=1 second, the number of data in the sequence n=50; in addition, the first set value is N 0.995 (0,1)=2.5762, the second set value is 0.55, and the third set value is 0.4.
[0045] Step 2: Collect the data during the start-up and speed-up process of the unit in real time, including the shaft relative vibration data of the supporting bearing on the ro...
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The invention discloses a real-time identification method for oil whirl fault of a turbo generator set, which belongs to the technical field of vibration state monitoring and fault diagnosing of rotating machinery. The method comprises the following steps: setting a time duration and a stepping length; acquiring the data of a generator set in the starting and accelerating process in real time; calculating and acquiring a vibration amplitude sequence and a vibration frequency sequence from low frequency to high frequency in the shaft relative vibration at the current moment by utilizing a rapid Fourier spectrum analysis method; when the preset duration is reached, obtaining the maximum sequence of the low-frequency vibration amplitude sequence, which is formed by arranged and stored data, and a frequency sequence corresponding to the maximum of the low-frequency vibration amplitude sequence; running a rotating speed frequency sequence; running a vibration amplitude sequence corresponding to the rotating speed frequency; and according to the value of each sequence, calculating and judging whether a support bearing at one side of the generator set rotor has oil whirl fault. By using the method provided by the invention, the real-time automatic online monitoring, analysis and judgment for the generator set rotor oil whirl fault are realized, thereby increasing the accuracy for identifying the generator set rotor oil whirl fault.
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 oil film eddy faults of a steam turbine generator set. Background technique [0002] Oil film whirl is one of the vibration faults that seriously affect the stability of the shaft system, and it will cause sudden vibration of the rotor of the turbogenerator during operation. The oil film in the shaft support bearing not only generates pressure to support the entire rotor, but also generates damping force to suppress rotor vibration. Under certain conditions, oil film whirl faults will occur in support bearings with small damping, which will reduce the stability of the shafting of the unit. If there is enough damping in the bearing, the rotor will return to its normal position and stabilize; if the damping in the bearing is too small, the rotor will continue to lose stab...
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Inventor 宋光雄
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)