Abstract
In principle feedback control can not change the non minimum-phase characteristics with undershooting phenomenon. An extended inverse function is introduced to realize the stable input-output dynamic inversion of all-pass functions involved in non minimum-phase characteristics. Responses of the non minimum-phase systems can be improved by the combination of the feedforward based on the extended inverse function and the feedback from the minimum-phase state of the object. Numerical example reveals that the feedforward control suppresses the undershooting phenomenon acconmpanied by the responses.
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