In this book, a high fidelity ball bearing and squeeze film damper
(SFD) model including thermal effects is developed for an energy
storage flywheel system with active magnetic bearings (AMBs). A
high fidelity nonlinear ball bearing employs the Hertzian contact
load-deflection model between ball and races, and predicts ball
contact load and stress during rotor drop. Thermal growths and
expansions of bearing components are estimated and applied to the
ball bearing dynamics. A SFD model, based on FEM, determines oil
film pressure distribution, calculates viscous damping force
correcting oil film cavitation and predicts power loss due to
viscous dissipation in oil film. Using the model capabilities, a
variety of simulations for the energy storage flywheel system are
conducted to investigate the effects of auxiliary bearing design
parameters on the dynamic responses of flywheel rotor drop.
Auxiliary bearing design guides to provide safe landing of rotor
and to prevent high speed backward whirl are presented based on
performance indices from the simulation results.
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