Nonlinear Dynamic Analysis of a Rotor Shaft System With Viscoelastically Supported Bearings

摘要: This research investigates the dynamic analysis of a single-rotor shaft system with nonlinear elastic bearings at ends mounted on viscoelastic suspension. Timoshenko model is utilized to incorporate flexibility shaft; rotor considered be rigid and located mid-span shaft. A bearing pedestal assumed which has cubic spring linear damping characteristics. The supports are modeled using Kelvin-Voigt model. Free forced vibration investigated based direct multiple scales method one-to-one frequency-to-amplitude relationship third order perturbation expansion. results show that limiting value internal coefficient exists where trend frequency-response curve switches. Also, primary resonance peak shifts higher frequencies increase characteristics, but flattened hence lower values. jump phenomenon takes place for high values