Abstract
In this paper, vibration characteristics of a rub-impact Jeffcott rotor system excited by mass unbalance including the eccentric mass and the initial permanent deflection are investigated. Through the numerical calculation, rotating speeds, mass eccentricities, initial permanent deflections and phase angles between the eccentric mass direction and the rotor initial permanent deflection direction are used as control parameters to investigate their effect on the rub-impact rotor system with the help of bifurcation diagrams, Poincare maps, frequency spectrums and orbit maps. Result shows that these two kinds of mass unbalance have great but different effect on the dynamic characteristic of the rubbing rotor system. Different motion characteristics appear with the varying of these control parameters, and complicated motions such as periodic and quasi-periodic vibrations are observed. Corresponding results can be used to diagnose the rub-impact fault and decrease the effect of rub impact in the rotor system with mass unbalance.
Highlights
Mass unbalance of the rotor is the main factor to increase vibration and bring unstable characteristics to the whole rotor system [1,2]
Eccentric mass is one of the mass unbalance to excite the motion of the rotor system, so it’s essential to study its effect on dynamic characteristic of the rub-impact rotor system
Vibration characteristics of a rub-impact Jeffcott rotor system excited by mass unbalance including the eccentric mass and the initial permanent deflection are investigated
Summary
Mass unbalance of the rotor is the main factor to increase vibration and bring unstable characteristics to the whole rotor system [1,2]. Since the rotor-stator rub is one of the main faults for large rotary machines, it has attracted great concern and lots of research work has been done by many researchers. Cao and Ma [3] investigated nonlinear dynamic characteristics of rub-impact rotor system with fractional order damping. Much work has been done respectively on the research of rotor mass unbalance and rotor-stator rubbing impact, the vibration characteristics of this kind of rub-impact rotors with mass unbalance have rarely been studied specially in the literature. Due to mass unbalance’s ubiquity, great effect on the vibration of the rubimpact rotor system and rub’s large threat to the safe operation of the rotor system, in this paper attention is paid to the research of vibration characteristics of rub-impact rotors with mass unbalance
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