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Vol. 165, Issue 2, February 2014, pp. 1-7




Study on Nonlinear Vibration and Crack Fault of Rotor-bearing-seal Coupling System

Yuegang LUO, Songhe ZHANG, Bin WU, Wanlei WANG

College of Electromechanical & Information Engineering, Dalian Nationalities University, Dalian, 116600, China

E-mail: luoyg@dlnu.edu.cn


Received: 12 November 2013 /Accepted: 28 January 2014 /Published: 28 February 2014

Digital Sensors and Sensor Sysstems


Abstract: The nonlinear dynamic model of rotor-bearing-seal system with crack in shaft is set up based on the coupling model of nonlinear oil-film force and Muszyska’s nonlinear seal fluid force. The dynamic vibration characteristics of the rotor-bearing-seal system and the effects of physical and structural parameters of labyrinth seal and crack fault on movement character of the rotor were analyzed. The increases of seal length, seal pressure differential, seal radius and axial velocity are in favor of the stability of the system, and it of seal gap and crack depth are not in favor of the stability of the system.


Keywords: Rotor system, Oil-film force, Seal force, Shaft crack, Nonlinear vibration.


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