Fractional-Frequency Rotor Motion Due to Nonsymmetric Clearance Effects Academic Article uri icon


  • 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.

author list (cited authors)

  • Childs, D. W.

citation count

  • 102

publication date

  • July 1982