부산대학교 도서관

In the authors’ previous reports, a new wind energy harvesting method using flexible piezoelectric films bonded on the surface of a flexible cylinder, termed as Piezoelectric Cylindrical Shell-type Wind Energy Harvesting Flag (PCSWEHF) was proposed. In order to overcome the low power generation of the piezoelectric wind energy harvesting method at small wind speeds, vortex-induced vibrations (VIVs) of the flexible cylinder excited by the Karman vortex generated downstream of PCSWEHFs was used and it was shown in the preliminary experiment that more than ten times larger power was generated by PCSWEHFs compared with the conventional planar-type piezoelectric energy harvesting flags. When applications of these energy harvesting flag are considered, more detailed structural designs are needed. However, the effects of structural parameters on the electric generating performances of the proposed wind energy harvesting flag were still unknown. In this study, several PCSWEHFs with different structural parameters, especially radius and thicknesses were considered, and by comparing their natural frequencies and vortex induced frequencies, the method to construct superior PCSWEHFs which could generate large power at a specific wind speed was investigated.