複数の圧電素子を用いた圧電インピーダンス法

抄録

The piezoelectric impedance method is a structural health monitoring method that utilizes a single piezoelectric element bonded on the surface of a target structure to detect damages by interrogating the electromechanical admittance (or impedance) of the piezoelectric element. In this paper, an idea of deploying multiple piezoelectric elements that are electrically connected in parallel is investigated for the rough localization of the damage by confining the sensing region. Qualitative modeling studies based on both modal expansion and wave propagation analysis are presented, and a possibility of using two or three piezoelectric elements connected in parallel is suggested to grant the piezoelectric impedance method an ability of spatial segmentation.