Dynamic response analysis of powerhouse under turbine pressure pulsation with different distributions and application methods

Abstract

Abstract Hydraulic excitation oriented from the turbine is one of the main sources of vibration for hydropower plants. Under different operation conditions, the amplitude, frequency and phase of pressure pulsation are different. The pressure pulsation of spiral case belongs to non-stationary waves, including traveling waves and standing waves. In this paper the pressure pulsation distribution characteristics of the spiral case were discussed and two kinds of distributions were assumed. The dynamic response of the powerhouse structure was simulated with FEM model through harmonic response analysis and transient dynamic analysis and the sensitivity of the pressure behaviour on the structure’s response were presented. The time history responses were also calculated under different turbine loads with different amplitude and frequency. The conclusion is that the structure dynamic responses under the traveling or standing waves are all greater than that with uniform assumption. So the distribution characteristics of pressure pulsation should be reasonably simulated to the dynamic analysis of the concrete structure.