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Abstract: The flywheels on reactor coolant pump motors provide
inertia to ensure a slow decrease in coolant flow to prevent reactor
damage as a result of a loss of power to the pump motors. Interference
fits serve to control critical speeds of the rotors. During overspeed,
the flywheel enlarges and gravitates from the vertical shaft to prevent
itself from a loss of integrity. A safe flywheel assembly is developed
which separates ring by ring at critical speeds. Plane stress method and
FE model with gap elements are used to design the interference and
evaluate the stress distribution. The whole frictional contact process:
sticking, sliding, and gravitating under the influence of rising
centrifugal forces is simulated.
Key
words: Flywheel Initial interference FEM Gap element Nonlinear
contact
CLC No: TH131.7
O343
Received
20020930, received in revised form 20030110
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