Study on the Transient Forced Vibration Characteristics of a Radial Turbine Impeller

Abstract

This work focuses on transient forced vibration response characteristics of a radial turbine passing through the resonant frequency at different speeds. The transient structure analysis based on the modal superposition method is used to calculate the vibration response of the impeller, and the frequency sweep tests are carried out to verify the calculation results. The experimental results are in good agreement with the simulation results. The impeller response curve becomes steeper as the frequency sweep time increases; however, the elastic potential energy of the blade is dissipated more by the structural damping at 13000 Hz. The response waveform of frequency sweep time 10s is close to the situation of 60s. When the frequency sweep takes the 60s, the excitation energy is input to the impeller, and the damping dissipation of the system reaches a state close to equilibrium.