Nonlinear bending-torsional coupled vibration characteristics of dual-universal joint rotor system

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (9) : 169-178.

VIBRATION AND MECHANICS SCIENCE

Nonlinear bending-torsional coupled vibration characteristics of dual-universal joint rotor system

HUA Chunli*, WANG Kai, CAO Guohua, LU Hao

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Abstract

In order to find out the bending and torsional coupling vibration mechanism and characteristics of a rotor system with double universal joints, the nonlinear dynamic equations of unbalance rotor system with double universal joints are established by the Lagrangian approach, which considering the influence of the angular misalignment, mass eccentricity and rubbing. Through numerical calculation, the coupled vibration characteristics of the rotor system are investigated in detail. The influences of the angular misalignment of double universal joints and the external excitation load on the vibration characteristics of the rotor system without rubbing are investigated. Moreover, the influences of rotation frequency, angular misalignment, eccentricity, damping ratio, contact stiffness and friction coefficient on the response characteristics of the rotor system with rubbing are studied by the diagrams of bifurcation via parameters. These analysis results of the present paper can be helpful to understand the dynamic response characteristics and phenomena of the bending and torsional coupling multi-span rotor systems, and provide the theoretical basis for the rotor system’s status recognition and fault diagnosis.

Key words

universal joints / rotor system / bending and torsional coupling / nonlinear vibration

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HUA Chunli, WANG Kai, CAO Guohua, LU Hao. Nonlinear bending-torsional coupled vibration characteristics of dual-universal joint rotor system[J]. Journal of Vibration and Shock, 2025, 44(9): 169-178

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