Effects of cross stiffness on dynamic characteristics of rubbing rotor

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 176-181.

LIU Xiaofeng, ZHANG Chi, BO Lin, LUO Hongling

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Abstract

Aiming at the problem of the simplified spring model and nonlinear dynamic oil film force model being not conducive to analyzing effects of cross stiffness on rubbing rotor dynamics, a Jeffcott rotor dynamic model based on asymmetric direct stiffness and cross stiffness was established.Combining the shooting method and Floquet theory was used to study influence laws of rotor cross coupled stiffness on rotor system motion stability.A new parameter “rubbing energy” was introduced to characterize quantitatively the rotor rubbing fault, and analyze effects of rotor-stator clearance on rubbing degree of rotor with different cross stiffnesses.The results showed that in cases of different rubbing energy, the change of cross stiffness of rotor system can induce period-1 motion, and then through side-wiping bifurcation suddenly transit to chaos or through Neimark-Sacker bifurcation gradually transit to chaos; the forward whirl through trans-critical bifurcation evolves to reverse whirl; when the cross stiffness is larger, increasing rotor-stator clearance can aggravate the rubbing degree between rotor and stator.

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rotor rubbing fault / cross-stiffness / rotor dynamics / rubbing energy

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LIU Xiaofeng, ZHANG Chi, BO Lin, LUO Hongling. Effects of cross stiffness on dynamic characteristics of rubbing rotor[J]. Journal of Vibration and Shock, 2021, 40(11): 176-181

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