Fluid‐Induced Vibration Elimination of a Rotor/Seal System with the Dynamic Vibration Absorber

Abstract

The dynamic vibration absorbers have been applied to attenuate the rotor unbalance and torsional vibrations. The major purpose of this paper is to research the elimination of the fluid-induced vibration in the rotor/seal system using the absorber. The simplified rotor model with the absorber is established, and the Muszynska fluid force model is employed for the nonlinear seal force. The numerical method is used for the solutions of the nonlinear differential equations. The nonlinear responses of the rotor/seal system without and with the absorber are obtained, and then the rotating speed ranges by which the fluid-induced instability can be eliminated completely and partially are presented, respectively. The absorber parameters ranges by which the instability vibration can be eliminated completely and partially are obtained. The results show that the natural frequency vibration due to the fluid-induced instability in the rotor/seal system can be eliminated efficiently using the absorber. The appropriate natural frequency and damping ratio of the absorber can extend the complete elimination region of the instability vibration and postpone the occurrence of the instability vibration.

Eliminating the Fluid‐Induced Vibration and Improving the Stability of the Rotor/Seal System Using the Inerter‐Based Dynamic Vibration Absorber

“…e numerical calculation is employed due to the complicated nonlinear terms of equation ( 8) and implicit equation (16). e parameters of the rotor/seal system are obtained from reference [29] in order to compare with the previous research.…”

“…e traditional DVA has been applied to eliminate the instability vibration in the rotor/seal system in reference [29].…”

“…e IDVA has been utilized to the vibration control of the cable [25,26], the offshore wind turbine [27], tall building [28], and so on. e traditional DVA could eliminate the instability vibration in the rotor/seal system [29,30]. e fluid-induced instability elimination of the rotor with the IDVA is proposed in this paper.…”

“…Normally, the running speed of the kind of the rotor system is between the first-and second-order critical speeds. erefore, the modified Jeffcott rotor model and B/M nonlinear seal force model are employed for the rotor/seal system model [1,29]. e rotor model is employed for considering the first-order vibration shape.…”

Orbit Decomposition Method for Rotordynamic Coefficients Identification of Annular Seals

“…Besides leakage flow reduction, annular seals are intended to serve as vibration damping devices. However, the flow in seals often generates fluid-induced forces that can destabilize the rotor [3,4]. As modern turbomachinery is moving towards higher operating parameters, the fluid-induced forces and their influence on the rotordynamic stability are becoming more pronounced [5,6].…”