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 circuitry elements, to a mechanical structure can alter the dynamic behavior of the structural system. From a system dynamics standpoint, these circuitry elements are analogous to the mass, damping, and stiffness elements in the mechanical regime. Using op amp circuits we can synthesize circuitry elements with interesting characteristics such as tunable or negative elements. In this research, we demonstrate that the negative resistance element can reduce the overall system damping, thereby changing the dynamic response of mechanical structures. In particular, it will be shown that not only the response amplitude can be amplified; the response pattern in the mistuned periodic structure can be altered significantly upon the change of local structural properties. Such phenomena are analyzed systematically, and the potential advantage for structural damage detection is highlighted.