Bending–Torsional Coupling Vibration of Hydro-Turbine Generator Unit Considering Gyroscopic Effect Under Multiple Excitations

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Abstract
In this study, a bending–torsional coupling vibration model of the hydro-turbine generator unit (HTGU) incorporating the gyroscopic effect is developed. Using numerical simulation grounded in the actual installation and operational parameters of a hydropower station in China, the vibration characteristics of the HTGU are analyzed under conditions with and without hydraulic excitation, as well as with and without consideration of the gyroscopic effect. Through numerical simulation, it was found that the difference in the x-direction vibration amplitude of the generator rotor between model 1 and model 2 during the start-up phase was less than 5%, indicating that the gyroscopic effect had no influence on the bending–torsional vibration of the HTGU during the start-up phase. However, after a certain period of time, the gyroscopic effect on the bending–torsional vibration of the unit gradually becomes apparent. The vibration amplitude in the x-direction of model 1 is 28% higher than that of model 2, and the amplitude difference in the y-direction reaches 19%. Furthermore, it was found that due to the effects of hydraulic excitation and gyroscopic force, the vibration characteristics of the generator rotor and the turbine runner in the x- and y-directions were different. Under hydraulic excitation, the amplitude of the y-direction vibration of the turbine runner in model 1 was 31% lower than that in model 2. The findings of this study provide a theoretical basis for the modeling and installation of hydro-turbine generator units (HTGUs).
Funding Information
  • Open Research Fund of the Hubei Technology Innovation Center for Smart Hydropower (1523020038)

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