Nonlinear dynamic analysis of a rotor shaft system with viscoelastically supported bearings

Nabeel Shabaneh, Jean W. Zu

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

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-toamplitude 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.

Original languageEnglish
Pages (from-to)290-298
Number of pages9
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Volume125
Issue number3
DOIs
StatePublished - Jul 2003

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