Hybridization of Active Control and Pasive Resonant Shunt

Resonant shunt circuit applied on a transducer like piezoelectric or voice coil is widely used as a passive control technique to damp a specific vibration mode. While very simple and robust, the damping capability is proportional to the electromechanical coupling of the transducer. On the other hand, one of the major difficulties that arises in practical implementation of purely active vibration control is the power consumption required for conditioners and control units. The idea of using hybrid control system is proposed in this study to combine the passive shunt device with an active control in order to improve the performance with low power consumption. Both active voltage source and active current source are proposed and compared. The method of maximum damping, i.e. maximizing the exponential time-decay rate of the response subjected to the external impulse forcing function, is used to optimize the parameters of the passive and hybrid control systems. The advantage of using hybrid control configuration in comparison with purely active control system is also investigated in terms of power consumption.