Simulation Analysis of the Vibration Causes of Underground Powerhouse in Pumped Storage Power Station
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Abstract:
The three-dimensional finite element analysis method was used to simulate the dynamic characteristics and dynamic response of two units in the main powerhouse of the pumped storage power station. According to analysis results of the natural vibration frequency of the whole powerhouse structure, natural vibration frequency of the partial structures, and the staggered degree of main vibration frequency of the powerhouse, resonance does not occur for the whole structure of powerhouse, and the severe vibration of the powerhouse is caused by the resonance of the partial support components under the excitation frequency of vibration source. With the comparative analysis of vibration acceleration distribution patterns obtained from the field tests and the time history response of the finite element model, the main hydraulic vibration source stimulating the powerhouse vibration is the pressure pulsation between the rotor and the vanes. The frequency of pressure pulsation (100 Hz) is twice of the blade overcurrent frequency. The analysis of the vibration causes of the pumped storage power station can provide references for the anti-vibration check during the design stage and vibration cause analysis during the operation period of the pumped storage power station.
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