FRACTIONAL-FREQUENCY ROTOR MOTION DUE TO NONSYMMETRIC CLEARANCE EFFECTS.
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Analysis based on the Jeffcott model demonstrates 1/2 speed subharmonic motion can be explained as either a linear parametric-excitation phenomenon or as a stable nonlinear subharmonic motion. The 1/3 speed motion is possibly due to radial stiffness nonlinearity. During a normal-tight rubbing condition, Coulomb damping widens the potential range of unstable speeds.
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