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Rotating machinery is extensively applied in engineering.In order to increase of efficiency of rotating machinery, the clearance between rotor and stator has been designed to be smaller and smaller, however, which lead to a larger possibility of impact-rub.Rub may induce the rotors dynamic instability, blade break, and other serious accidents.Therefore.how to avoid rub and how to reduce the harm caused by rub become an important problem in rotor dynamics.