Vibration and crack propagation control for cracked asymmetric rotor based on 3-D finite element model

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (23) : 1-9.

LIU Jun1,2,HU Rong1,CHEN Jianen1,2,WANG Xiaofeng1,2

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Abstract

Aiming at vibration problems of a cracked asymmetric rotor, a 3-D finite element (FE) model for the rotor system was established using the nonlinear contact FE approach.The free interface modal synthesis method was used to reduce the model’s orders and computation time.Effects of related parameters on unstable zone of main resonance and those of different crack positions on the rotor’s vibration characteristics were analyzed through simulation analyses.The results showed that appearance of cracks can affect the rotor’s resonance frequency and unstable zone range; electromagnetic actuator (EMA) with fuzzy-PID control can be used to realize the active control of the rotor system’s vibration; based on the rotor dynamics theory and the crack open-close mapping method proposed here, effects of rotating speed, uneven mass and asymmetric rotor’s flatness on rotor crack’s open-close features were studied to propose the method effectively delaying crack propagation; test results reveal EMA can be used to suppress the cracked rotor’s vibration and crack breathing effect, and verify the effectiveness of the proposed control method.

Key words

cracked asymmetric rotor / 3-D finite element model / vibration control / delay crack propagation

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LIU Jun1,2,HU Rong1,CHEN Jianen1,2,WANG Xiaofeng1,2. Vibration and crack propagation control for cracked asymmetric rotor based on 3-D finite element model[J]. Journal of Vibration and Shock, 2019, 38(23): 1-9

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