Real-time diagnosis method for oil film whirl fault of large steam turbine-generator

Abstract

The invention discloses a real-time oil film whirling fault diagnosis method for a large steam turbine generator set, belongs to the fields of mechanical vibration state monitoring and fault diagnosis, and relates to the real-time online monitoring of the vibration state of the large steam turbine generator set. The method comprises the following steps: collecting vibration signals of a rotor shaft of a steam turbine set to carry out necessary data preprocessing on vibration data, judging that the rotating speed of a shaft system of the set is less than twice of a first critical rotating speed of a rotor, further combining the Fast Fourier Transform (FFT) spectrum analysis method to carry out the real-time quantitative computation and analysis of the shaft vibration data such as unicity verification of the main frequency for the low frequency vibration of the shaft vibration, condition verification of the main frequency for the half-frequency vibration of the shaft vibration, the condition verification of the half-frequency vibration amplitude of the shaft vibration and the like, and automatically diagnosing whether an oil film whirling fault occurs in the set based the real-time quantitative computation and analysis and in conjunction with various verification results in a real-time and online manner. The method has the advantages of scientificness, reliable conclusion, automatic realization of the real-time online monitoring and fault diagnosis and the like.

Description

technical field [0001] The invention belongs to the field of vibration state monitoring and fault diagnosis of rotating machinery, and in particular relates to a real-time diagnosis method for oil film eddy faults of a steam turbine generator set for real-time on-line automatic monitoring of the vibration state of a large steam turbine generator set. Background technique [0002] The stability of the shaft system of a turbogenerator set is directly related to the safe operation of the unit and the reliability of the equipment. Shafting stability is low, light cases will increase maintenance costs, affect equipment availability, and seriously cause major unit damage accidents. Among the many factors that affect the stability of the shafting of the unit, the bearing is the decisive factor. 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, o...

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Problems solved by technology

Usually, the diagnosis of the oil film whirl fault of the unit is completed by experienced experts, which has the disadvantages of high economic cost of diagnosis, long cycle, low reliability and poor real-time performance

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