Vibration control of rotationally periodic structures using passive piezoelectric shunt networks and active compensation

This paper proposes a multi-mode vibration suppression scheme for rotationa lly periodic structures. Identical active-passive hybrid piezoelectric netw orks are applied on each of the substructures, where active charge and curr ent feedback is used together with passive piezoelectric shunts to optimize the network performance. By exploiting the rotational periodicity a new al gorithm is synthesized to analytically determine the control parameters. It is shown that this hybrid approach can suppress all the spatial harmonics, which cannot be achieved by purely passive piezoelectric shunts. It is als o observed that such a configuration requires much less control effort (vol tage and power) when compared to a purely active approach.