On January 27th, the Aerospace Engineering Department here at Embry-Riddle hosted Dr. Flowers for his presentation on the “Development, Implementation, and Testing of an Adaptive Disturbance Rejection Controller for magnetic Bearing Supported Rotor Systems.”
Magnetic bearings offer a number of advantages over conventional rolling element bearings. They provide support for rotating systems through magnetic levitation rather than by mechanical contact, nearly eliminating the energy losses attributable to friction in standard bearings. Low power consumption is one characteristic of magnetic bearings that has encouraged their use in an increasing number of applications. Another is the ability to use the bearing itself as an actuator in a controller that can alter the orbit of the rotating system within the bearing to reduce or eliminate the detrimental effects of disturbances acting on the system. In addition, controller outputs can potentially be used as an indicator of the general health or integrity of the system.
This work details the development of an adaptive disturbance rejection controller for a magnetic bearing system that is capable of suppressing disturbances acting at synchronous and asynchronous frequencies resulting from rotating imbalances and base motion. The work was based on an existing adaptive controller that formed part of the overall control system for a magnetically supported rotor and flywheel. The development of the controller made extensive use of system modeling techniques and model-in-the-loop simulations. The adaptive controller was shown to produce excellent disturbance rejection and vibration suppression. The capabilities of the controller were demonstrated with software simulations, simulated disturbances and physical changes in the balance of the rotor and flywheel.
George T. Flowers received a B.S. in mechanical engineering from Auburn University in 1984, and M.S. and Ph.D. degrees, both in mechanical engineering, from […]