Vibration energy harvester design and experimental study based on double-negative metamaterials

Abstract

Abstract This paper proposes an energy harvesting device based on a double-negative metamaterials structure. The negative stiffness behavior of the pre-compressed buckled beam is used to introduce bistability, which broadens the operating frequency band of the energy harvester. Simultaneously, the energy harvester utilizes the stress concentration and tensile-expansion effects inherent in auxetic structures to enhance the output voltage amplitude. Through finite element simulations and dynamic experiments, a comparative analysis of the static and dynamic characteristics of the double-negative buckled beam and auxetic straight beam is performed. Experiments show that, under the excitation of 2.2g acceleration, the working bandwidth and voltage amplitude of the buckled beam increased by 100% and 7.86%, respectively, when juxtaposed with the straight beam, thereby further achieving wide-frequency and high-efficiency energy harvesting.