This study proposes a novel approach to designing and fabricating a phononic crystal with embedded high-density resonators from 3D-printed magnesium alloy. The band structure and vibration suppression characteristics of the proposed structure are investigated using theoretical calculations and finite-element analysis. The bandgaps of the proposed phononic crystal are tuned using their superior structural design by changing the resonators. The effects of resonator mass on vibration suppression performance are also studied. The bandgap position and bandwidth are adjusted by changing the geometric parameters, broadening the application range. In addition, experiments are conducted to verify the bandgap accuracy. This study provides a new idea for constructing a 3D-printed magnesium alloy phononic crystal.
In this paper, a novel acoustic metamaterial beam attached with lattice structures and resonators is designed for elastic wave attenuation. The proposed acoustic metamaterial beam is fabricated by 3D printing with NiTi alloy. Theoretical analysis using negative effective mass is performed to derive the band gap of structure. The finite element method and experimental analysis are performed to investigate the dispersion relation and transmission spectrum. Furthermore, the effect of geometric features on the band gap is studied by simulations. Results proved that the metamaterial beam can be utilized for the control of low-frequency vibration.
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