This research investigates the dynamic analysis of a single-rotor shaft system with nonlinear elastic bearings at the ends mounted on viscoelastic suspension. Timoshenko shaft model is utilized to incorporate the flexibility of the shaft; the rotor is considered to be rigid and located at the mid-span of the shaft. A nonlinear bearing pedestal model is assumed which has a cubic nonlinear spring and linear damping characteristics. The viscoelastic supports are modeled using Kelvin-Voigt model. Free and forced vibration is investigated based on the direct multiple scales method of one-to-one frequency-to-amplitude relationship using third order perturbation expansion. The results of the nonlinear analysis show that a limiting value of the internal damping coefficient of the shaft exists where the trend of the frequency-response curve switches. Also, the primary resonance peak shifts to higher frequencies with the increase of the bearing nonlinear elastic characteristics, but with a flattened curve and hence lower peak values. A jump phenomenon takes place for high values of the bearing nonlinear elastic characteristics.
Nonlinear Dynamic Analysis of a Rotor Shaft System With Viscoelastically Supported Bearings
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received February 2002; Revised October 2002. Associate Editor: G. T. Flowers.
Shabaneh, N., and Zu, J. W. (June 18, 2003). "Nonlinear Dynamic Analysis of a Rotor Shaft System With Viscoelastically Supported Bearings ." ASME. J. Vib. Acoust. July 2003; 125(3): 290–298. https://doi.org/10.1115/1.1547684
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