| Smart structure, which is defined as "a system or material which has built-in or intrinsic sensors, actuators and control mechanisms is capable of responding adaptively to the environment", has attracted more and more interest in recent decades, especially in the applications of aerospace, civil, and mechanical infrastructures. Piezoelectric, with its special electromechanical characteristics, is widely used in the smart structure design. Piezoelectric-based multifunctional smart structures for integrated vibration energy harvesting, structure health monitoring, and vibration control are studied in this dissertation.;In the aspect of energy harvesting, a novel piezoelectric energy harvester with multi-mode dynamic magnifier is proposed and investigated, which is capable of significantly increasing the bandwidth and the energy harvested from the ambient vibration. In addition, a 33-mode multilayer piezoelectric stack with force amplification frame is designed and studied, which has large power generation and high power density ratio. In the aspect of structure health monitoring, an admittance-based structure health monitoring method with a high-order resonant circuit is proposed and investigated, with advantage of increased damage detection sensitivity. In the aspect of vibration control, a self-powered piezoelectric vibration control system is proposed and investigated for flexible structures, with both functions of minimizing the vibration of the flexible structure and at the same time harvesting energy for the self-powered control implementation. In addition, a vibration and wave propagation attenuation method for metamaterials with periodic piezoelectric arrays with high-order resonant circuit shunts is proposed and developed. The proposed high-order resonant shunt circuit can introduce two local resonances in series around the tuning frequency to broaden the attenuation bandwidth, or can create two separate resonances to achieve two separate bandgaps. |
