Geometrically nonlinear wind-induced vibration piezoelectric energy harvester based on vortex-induced vibration

This paper proposes a geometrically nonlinear wind-induced vibration piezoelectric energy harvester (WIVPEH) with a maximum size of only 80 mm. Introducing nonlinearity solely through geometric structure design reduces the overall stiffness of the system, enabling the device to excite multi-mode coupling and induce internal resonance even under low wind speed conditions, thereby broadening the bandwidth. Wind tunnel experiments demonstrated that the device could vibrate at a wind speed of 1.5 m/s. Under low wind speed, the piezoelectric output is about 4 times greater than that of ordinary devices. Our research indicates that the designed device can maintain efficient wind energy collection within a low wind speed range.