Abstract
Applying magnetic bearings in turbine machines can improve their performance. Yet, a new type of contact known as multilocation-rub-impact for high-speed magnetic-levitation bladed rotors becomes a prominent problem for this new type of turbomachinery. So far, the study of rub-impact faults mainly involves the rotor/stator contact at a single position. The paper aims to clarify the multilocation-rub-impact behaviors of the magnetic-levitation bladed rotor, considering magnetic saturation nonlinearity. To achieve this, three kinds of rub-impact models for different types of contacts at multiple positions were presented. An electromagnetic force model with magnetic saturation nonlinearity based on the Kriging method was first given, which was validated by comparing interpolation data with the real solution. Multilocation-rub-impact dynamic characteristics were revealed as follows. Through obtaining the change rule of multiple small clearances with crucial parameters, the vibration amplitude expression of the magnetic-levitation bladed rotor at multiple small clearances and the quantitative formula of small clearances were first proposed, which provides a simplified analysis method for predicting such faults. For the multilocation-rub-impact behaviors, the rub-impact fault in one or a few positions causes more severe vibrations and leads to contacts in more positions. Magnetic saturation nonlinearity exacerbates such multilocation-rub-impact behaviors. The results benefit the design and application of new control methods and rotor structures. The presented model and the simplified analysis approach can evaluate the multilocation-rub-impact behaviors of a magnetic-levitation bladed rotor and predict such faults.
Published Version
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