Dynamic response analysis of a sliding bearing-rotor system considering thermal effects

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (18) : 95-102.

ZHAO Daoli 1,2, MA Xiaodong 1, SUN Weipeng 1, WAN Tianhu 3, LUO Xingqi 1,2

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Abstract

Aiming at the rotor system vibration caused by the unstable temperature change of lubricating oil in sliding bearings, the nonlinear oil film force of a short bearing was derived under the Gumbel boundary assumption.Considering the temperature-driven oil viscosity change, the fourth-order Runge-Kutta method was used to solve the differential equation of the system.The time history, phase portrait, Poincaré diagram, power spectrum, cascade spectra, and bifurcation diagram were obtained to investigate the dynamic responses of the rotor-bearing system.The results show that the oil with high temperature-viscous coefficient has better inhibition effect on the quasi-periodic and chaotic motion near the second-order critical speed of the rotor.The increase of oil temperature is beneficial to the stability of the rotor system under low-speed range, but the rotational speed region corresponding to the phenomenon of oil film whirl and whip will be prolonged in the vicinity of the second-order critical speed.

Key words

sliding bearing-rotor system / nonlinear oil-film force / short bearing / mass eccentricity / oil temperature

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ZHAO Daoli 1,2, MA Xiaodong 1, SUN Weipeng 1, WAN Tianhu 3, LUO Xingqi 1,2. Dynamic response analysis of a sliding bearing-rotor system considering thermal effects[J]. Journal of Vibration and Shock, 2019, 38(18): 95-102

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