Vibration control and crack propagation delay of a nonlinear cracked rotor

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (21) : 134-142.

LIU Jun ,2, HU min1, Chen Jianen1,2, Wang Xiaofeng1,2

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Abstract

Aiming at a cracked rotor’s nonlinear vibration problems, taking a Jeffcott cracked rotor with nonlinear restoring forces of bearing and electromagnetic actuator as a study object, its vibration response was analyzed through simulation and tests.An electromagnetic actuator with a neural network PID controller was adopted to realize the active control for nonlinear vibration of the cracked rotor.Through comparing the neural network PID control method and the traditional PID control one with simulations, it was shown that the neural network PID control method has better control performance and resisting disturbance ability for the nonlinear cracked rotor system.The opening-closing characteristics of a crack were analyzed based on the theory of rotor dynamics.The effects of different parameters on crack propagation were studied with the numerical method to propose the method for effectively delaying crack propagation.

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Nonlinear cracked rotor / Electromagnetic actuator / Neural network PID / Vibration control / Delaying crack propagation

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LIU Jun,2, HU min1, Chen Jianen1,2, Wang Xiaofeng1,2 . Vibration control and crack propagation delay of a nonlinear cracked rotor[J]. Journal of Vibration and Shock, 2018, 37(21): 134-142

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