engleski

Complicated behaviour of the rotor/stator contact in rotating machinery

The phenomenon of contact between a rotor and stator known as rub has long been recognized as a serious cause of failure in rotating machinery. The analysis of rub is particularly complicated, due to non-linear and often chaotic behaviour. Thus a general rub-impact rotor model is founded in the light of the classic impact theory. The numerical results given in the form of disk center orbits, a Poincarés maps, and bifurcation diagrams show all kind of complicated behaviour of the rub-impact rotor system, including not only periodic responses, but also chaotic responses. The paper considers a simplified Jeffcott rotor system with one rigid casing ring elastically mounted around the rotors disk. The analysed system has a 4 d.o.f. Runge-Kutta integration method was applied to obtain numerical solution of the equation of motion. Parametric analysis of the rotor system is conducted with respect to casing ring mass and stiffness.

Contact; Rotor/Stator Vibrations; Bifurcations

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