DYNAMIC ANALYSIS OF PIEZOELECTRIC ACTUATOR-DRIVEN CIRCULAR RINGS USING AN IMPEDANCE APPROACH

This paper presents a dynamic model for the response of a circular rin g excited by piezoelectric transducer (PZT) actuators bonded on the ri ng surface. The dynamic response is determined based on the dynamic in teraction between the PZT actuators and the structure using an impedan ce approach. Compared with the conventional static approach, in which a statically determined ''equivalent force'' of the actuator is used a s the forcing function in the dynamic analysis, the impedance approach cannot only capture the physics of the actuator/structure interaction , but also accurately predict the structural dynamic response. Experim ents have also been conducted to verify the theoretical model. The pre dicted dynamic response using the impedance approach agrees very well with the experimental results. Comparison of the conventional static a pproach and the impedance model has also been presented.