Simulation analysis of the control of the unbalance response of a rotor with magnetically levitated dynamic absorber

An active electro-magnetically-levitated dynamic absorber is proposed. The absorber advanced here, not rotating with rotor, can be designed in practice, and needs not to be placed at the bearings. Thus, both the static and dynamic properties of rotor system can be considered simultaneously, and the design difficulties caused by centrifugal can be overcome also. Therefore, the design conception is of great value for practical use in engineering The control system of an electro-magnetically-levitated dynamic absorber has been designed using the theory of output regulation. The main aim of the control system is to reduce the unbalance response of the rotor equipped with the absorber to zero at a specified frequency and to a non-resonant level at other frequencies. The effectiveness of the control method and the feasibility of the absorber for control of rotor unbalance response have been shown by numerical simulations on the frequency characteristics.