DIGITAL VIBRATION CONTROL AND BALANCING FOR A FLEXIBLE ROTOR SUSPENDED BY MAGNETIC BEARINGS

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The PID controller with an analog circit is widely used in the active magnetic bearing system.Although this system is simple and non-expensive, the ability of vibration control for a flexible rotor is not sufficient.To reduce resonance vibrations of a flexible rotor suspended by active electromagnetic bearings, the state feedback control whose design is besed on an approximate reduced-order model is effective.For a realization of this control, it is necessary to estimate unbalance forces.One method which is often used for estimating the state is so called a state observer and this method is vallid only for external forces being periodic.The other method is an inverse system in which external forces have not to be periodic in comparison with a state observer.In this research using these estimator we design the state feedback controller which enables to improve modal damping of the mechanical system independently.In the experimental system applied above concept, it is verified that the feedback control which relates a modal velocity has a capability to improve a dampimg property of the mechanical systemon each mode.