Investigation of an AMB Based Auxiliary Mass Dynamic Absorber

This paper investigates the effectiveness of a magnetic bearing when used as an auxiliary mass dynamic absorber. The system is modeled as a 2-DOF, lumped mass approximation with a linearized actuation force. The accuracy of force linearization for an AMB absorber is discussed. Performance of the absorber is quantified on the basis of response attenuation, required actuating force and robustness to uncertainty in the actuating force. Performance is assessed under constrained PD control and robust µ-synthesized control approximated by DK iteration. Results indicate that magnetic bearings are plausible in such an application when implemented with higher order µ-synthesized control.