Abstract This paper presents an alternative approach for active vibration control for systems with periodic disturbances of time-varying fundamental frequency. The motivation for this approach is active control of engine-induced vibration in automotive vehicles, where the fundamental frequency, i.e., engine firing frequency, goes from approximately 7 Hz at idle (840 rpm) to approximately 50 Hz (6000 rpm). In this approach, an observer for an input disturbance is designed based on a disturbance model containing all frequencies to be cancelled. The disturbancemodel part of the observer is time-varying since the frequency measurement is fed into this part. Based on the current frequency, an observer gain is selected from a set of pre-computed gains. The proposed approach is non-adaptive, where the frequency is used as a scheduling variable.
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