ANALYSIS OF DYNAMIC CHARACTERISTICS OF ENERGY STORAGE FLYWHEEL ROTOR WITH FOUNDATION MOTION

When the flywheel energy storage system runs in complex environment, the foundation will be affected by the environment to produce a complex motion state, which will bring additional excitation and affect the rotor motion state. In this paper, the dynamic problem of flywheel energy storage rotor with foundation motion is studied. First, the flywheel rotor is equivalent to Timoshenko beam element model, and the finite element dynamic model with foundation motion is established by coordinate transformation. The dynamic characteristics of the rotor with foundation in regular motion are studied. The following conclusions are drawn:the increase of the foundation motion parameters will enlarge the natural frequency separation and change the critical speeds. The frequency component of the foundation motion appears in the steady-state response spectrum of the rotor, and the amplitude increases with the increase of the frequency and amplitude of the foundation motion. When the frequency of the foundation motion is close to the frequency corresponding to the critical speed, the resonance will be caused, the peak of the foundation motion frequency component will appear in the steady state spectrum, and additional formant will appear in the transient acceleration response. The influence of foundation motion should be considered in rotor design and application. © 2025 Science Press. All rights reserved.