LOW-FREQUENCY VIBRATION ISOLATION AND ENERGY HARVESTING SIMULTANEOUSLY IMPLEMENTED BY A METAMATERIAL WITH LOCAL RESONANCE

Integration of vibration isolation and energy harvesting is a dynamic mechanism, in which the harmful vibration could be isolated and converted into electrical energy. In this paper, the dynamic behavior of dual-functional metamaterials for vibration isolation and energy harvesting is studied based on the low frequency band gap characteristics of local resonance metamaterials. A spherical pendulum resonator with energy harvesting function is placed in the spherical cavity by fixing the pendulum of the induction coil. The vibration in the range of band gap frequency can be harvested in the resonator, with the aiming at the dual-functions of vibration isolation and energy harvesting. The dynamic equation of dual-functional metamaterial beam under transverse excitation is established, the energy band structure of metamaterial is obtained by using Bloch’s theorem, and the band gap characteristics of metamaterial beam under different parameters are studied. The theoretical model and research method are verified by finite element simulation. Furthermore, the vibration isolation and energy harvesting characteristics of dual-function metamaterial plates are studied. Finally, a dual-functional metamaterial dynamic experimental platform for vibration isolation and energy harvesting is designed and constructed. The analytical, numerical and experimental results demonstrate that the vibration of the metamaterial beam matrix is significantly suppressed in the frequency range of the local resonant band gap. Simultaneously, the vibration is sinked in the resonator, so that the harvested voltage reaches the maximum. The comparison of the energy band structure and amplitude frequency response between with and without the additional resonator reveals that the addition of the spherical pendulum resonator can generate a local resonant band gap in the low frequency range, which can effectively improve the vibration isolation and energy harvesting performance of the metamaterial beam at the low frequency.