Xj. Dai et al., On the vibration of rotor-bearing system with squeeze film damper in an energy storage flywheel, INT J MECH, 43(11), 2001, pp. 2525-2540
The permanent magnetic bearing and the small-sized hydrodynamic spiral groo
ve bearing are utilized as supports for the rotor of the energy storage fly
wheel system. The hydrodynamic bearing and the squeeze film damper do not n
eed the oil cycle to remove the heat caused by friction because the frictio
n loss is small. The linear dynamics model with four degrees of freedom is
built to describe the vibration of the fly-wheel rotor-bearing system. The
squeeze film dampers show good behavior in suppressing the vibration and im
proving the stability of the rotor-bearing system. The analytical solution
of the dynamic characteristic coefficients of the squeeze film is achieved
from Reynolds equation after some simplifications are taken. The numerical
computation shows that the moment unbalance excites larger vibration of the
rotor than the force unbalance. The upper damper plays an important role i
n helping the rotor pass its critical speed. The damping coefficient of the
squeeze film dampers should be selected carefully. The flywheel arrived at
the speed of 39, 000 rpm and stored the energy of 308 Wh in the experiment
. The calculated unbalance response is compared to the test response of the
rotor storing quantities of kinetic energy. The comparison indicates that
the dynamics model of the rotor-bearing-damper system is appropriate. (C) 2
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