A Phononic Crystal with Differently Configured Double Defects for Broadband Elastic Wave Energy Localization and Harvesting

Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems broaden the bandwidth. However, these prior are limited examining an identical configuration defects. Therefore, this paper aims propose new design concept for PnCs that examines differently configured defects broadband elastic wave localization and harvesting. For example, square-pillar-type unit cell is considered be structure where one patch bonded host square lattice in absence pillar. When introduced PnC sufficiently distant from each other implement decoupling behaviors, oscillates like single independent defect. Here, by differentiating geometric dimensions two patches, defects’ dissimilar equivalent inertia stiffness contribute individually manipulating bands correspond Hence, with adequately designed patches consider both effects on shift patterns characteristics output electric power obtained single-defect case, we can successfully localize harvest transferred frequencies.