Piezoelectric shunting parameter estimation using electrical impedance models

초록

In this paper, a passive damping enhancement of piezoelectric smart structures is studied. A conventional parameter tuning method of the passive damping using piezoelectric smart materials, so called a mechanical vibration absorber method, is reviewed and a new method for determining the optimal shunting parameters using electric impedance is developed. The electric impedance method determines the optimal parameters by maximizing the dissipated energy at the load resistor. To see the validity of this approach, a mechanical vibration absorber is taken as an example and the shunting parameters tuned by proposed method agree with those of conventional tuning method. A piezoelectric cantilevered beam for single mode shunt and plate for multiple-mode shunt are taken as examples for real implementation. The simulation and experiment are conducted and they show remarkable vibration reductions at targeted modes. This method can be applied to arbitrary piezoelectric smart structures such that it will increase the applicability of smart structures to noise and vibration reductions.