Structural Engineering and Mechanics

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Non-linear vibration and stability analysis of an axially moving rotor in sub-critical transporting speed range

  • Ghayesh, Mergen H. (Department of Mechanical Engineering, McGill University) ;
  • Ghazavi, Mohammad R. (Mechanical Engineering Department, School of Engineering, Tarbiat Modarres University) ;
  • Khadem, Siamak E. (Mechanical Engineering Department, School of Engineering, Tarbiat Modarres University)
  • Received : 2007.07.02
  • Accepted : 2009.12.08
  • Published : 2010.03.10
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Abstract

Parametric and forced non-linear vibrations of an axially moving rotor both in non-resonance and near-resonance cases have been investigated analytically in this paper. The axial speed is assumed to involve a mean value along with small harmonic fluctuations. Hamilton's principle is employed for this gyroscopic system to derive three coupled non-linear equations of motion. Longitudinal inertia is neglected under the quasi-static stretch assumption and two integro-partial-differential equations are obtained. With introducing a complex variable, the equations of motion is presented in the form of a single, complex equation. The method of multiple scales is applied directly to the resulting equation and the approximate closed-form solution is obtained. Stability boundaries for the steady-state response are formulated and the frequency-response curves are drawn. A number of case studies are considered and the numerical simulations are presented to highlight the effects of system parameters on the linear and nonlinear natural frequencies, mode shapes, limit cycles and the frequency-response curves of the system.

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References

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