Nonlinear modeling of the connection interface of a rod-fastened rotor with cracked rod and its multi-parameter evolution

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (6) : 138-146.

XU Wenbiao1,2,WANG Ailun1,2,LIAO Zeyu2,LIU Le1,2

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Abstract

The nonlinear vibration phenomenon of a circumferential rod-fastened rotor with cracked rod is of nonlinear property.The stiffness model of the cracked rod was established based on the supposition of Paris crack propagation and the model of the disk interface contact stiffness was also established, by which the preloading effect of the rod was characterized.On this basis, a nonlinear dynamics model of the connection interface of the rotor with cracked rod was completed by refering to the Capone short bearing model.The solution was analysed by virtue of the Poincare section surface method.It is found that the system alternates between the periodic doubling bifurcation and the quasi-periodic bifurcation in the e-n bifurcation set obtained under the influence of the factors of rotational speed and eccentricity.The solution distribution of bifurcation points on the η-n bifurcation set obtained under the influence of crack propagation and rotational speed is discontinuous.At different rotational speed, the bifurcation trajectory of displacement along with the crack propagation is rather complicated, and the presence of rod crack will accelerate or decelerate the occurrence of the bifurcation point.The results show that the mechanism of the effect of rod crack on rotor stability is affected by the system parameter set.The conclusion has certain significance for parameter design and fault identification of rod-fastened rotors.

Key words

rod-fastened rotor / crack propagation / nonlinear modeling / connection interface / bifurcation

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XU Wenbiao1,2,WANG Ailun1,2,LIAO Zeyu2,LIU Le1,2. Nonlinear modeling of the connection interface of a rod-fastened rotor with cracked rod and its multi-parameter evolution[J]. Journal of Vibration and Shock, 2020, 39(6): 138-146

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