The Open Mechanical Engineering Journal

2014, 8 : 480-486
Published online 2014 December 24. DOI: 10.2174/1874155X01408010480
Publisher ID: TOMEJ-8-480

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

Yuegang Luo , Songhe Zhang , Bin Wu and Wanlei Wang
College of Electromechanical & Information Engineering, Dalian Nationalities University, No. 18 Liaohe west Road, Dalian, Postcard: 116600, China.

ABSTRACT

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

Keywords:

Airflow excited force, bifurcation, nonlinear fluid-structure interaction, rotor system, rub-impact.