Abstract
Abstract A nonsynchronous low-frequency whirling occurs frequently for flywheel energy storage system (FESS) with permanent magnetic bearing (PMB) and spiral groove bearing. To suppress low-frequency vibration of a large-mass FESS, a radial magnetic pendulum tuned mass damper (TMD) and an axial magnetic pendulum TMD have been developed; and identification method of dynamic parameter for the magnetic pendulum TMD has been proposed. Dynamic model for the FESS has been established using the Lagrange’s equation; and effectiveness of the two magnetic pendulum TMD’s has been evaluated by analyzing mode damping ratios of the FESS. The results show that the two TMD’s can be effective for the low-frequency vibration of the high-capacity FESS with PMB and spiral groove bearing; and radial magnetic pendulum TMD is superior to the axial magnetic pendulum TMD due to its lower resonant frequency and larger mode damping ratio for the FESS.
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