Wideband Vibration Attenuation with 3D-printed CFRP Metamaterial Consisting of Periodic Compliant Lever-type Mechanisms

This study proposes a 3D-printed carbon-fiber-reinforced metamaterial for wideband vibration attenuation. The proposed metamaterial incorporates periodic lever-type mechanisms. Compliant hinges were used to develop the monolithic lever-type mechanisms. A rigid link-torsion spring model was developed to obtain the dispersion curves of the metamaterial. The band gap of this simplified model was identified to estimate the frequency range within which vibration transmission is inhibited. Frequency response and modal analyses were performed using the finite element method. The effects of the continuous carbon fiber placement and compliant hinge shape on the vibration attenuation performance were numerically examined. The proposed lever-type metamaterial was fabricated using a fiber-composite 3D printer, and its vibration transmissibility was measured. A significant reduction in the vibration transmissibility was observed over a wide frequency range around the massindependent antiresonance frequency. The experimentally obtained transmissibility agreed with that obtained by finite element analysis.