Changing Dynamic Behavior of Periodic Structures by Using Piezoelectric Circuitry with Negative Resistance

摘要

Integrating a piezoelectric circuitry, which consists of a piezoelectric transducer connected with electrical circuitryelements, to a mechanical structure can alter the dynamic behavior of the structural system. From a system dynamicsstandpoint, these circuitry elements are analogous to the mass, damping, and stiffness elements in the mechanicalregime. Using op amp circuits we can synthesize circuitry elements with interesting characteristics such as tunable ornegative elements. In this research, we demonstrate that the negative resistance element can reduce the overall systemdamping, thereby changing the dynamic response of mechanical structures. In particular, it will be shown that not onlythe response amplitude can be amplified; the response pattern in the mistuned periodic structure can be alteredsignificantly upon the change of local structural properties. Such phenomena are analyzed systematically, and thepotential advantage for structural damage detection is highlighted.