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Monday, July 8 • 17:50 - 18:10
DYNAMIC ANALYSIS OF RUB IN HIGH-SPEED ROTOR-STATOR CONTACT

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This research includes the model based on high-speed rotor, and used multi-body dynamics to investigate the dynamic response of rotor-stator system during rub-contact condition caused by initial periodic excitation. How the physical parameters of limit device influence the capability of the limit device is investigated in this paper. The analytical model consists of a sub-critical rotor, bearings, a damper and a limit device. Radial clearance, impact stiffness and friction forces due to rub are viewed in this model. A set of non-linear differential equations is obtained, and numerical solution is calculated using Runge-Kutta method. This research indicates that the impact between rotor and limit device can generates low frequency procession. Friction force is the major factor affecting the stability of rotor rubbing with stator. Higher friction coefficient and higher impact stiffness produce more possibility of full-annular rub and instability. Increasing the impact stiffness raises the maximum impact forces rotor bear which may cause destruction of rotor. The stability of rotor can be enhanced by increasing radial clearance between rotor and limit device. This, however, increases the maximum vibration amplitude during the impact. A critical friction coefficient curve due to stiffness change is derived. A stable area can be figured when taking both impact stiffness and friction coefficient into consideration.

Moderators
EP

Elsa Piollet

Dr, Polytechnique Montréal

Authors

Monday July 8, 2019 17:50 - 18:10 EDT
Outremont 7
  T07 Struct. dyn. & nonlin. vib., RS04 Rotordynamics

Attendees (3)