An electromagnetic controller is applied to a flexible rotor supported by two oil-film bearings. The synchronous vibration is controlled by using a combined estimation and optimization algorithm. This requires no a priori knowledge of the system model. The effect of using a limited number of measurement sites on the controller performance is assessed. Optimum measurement sites are defined. The results of both computer simulations and experimental studies are presented. It is shown that the strategy developed by the authors can reduce the synchronous vibration to less than 10 percent of the uncontrolled response. The open-loop adaptive strategy can be applied to reduce the time required for in-situ tuning of magnetic controllers.

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