Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System

摘要

Based on the coupling model of nonlinear oil-film force and nonlinear seal fluid force, a nonlinear dynamicmodel of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied withnumerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movementcharacteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain thestability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability ofthe system.