Vibration mode analysis of local resonance metamaterial with chiral spiral elastic beams

Local resonant metamaterials are highly effective for managing low-frequency vibrations in practical engineering applications. However, the focus of existing research on locally resonant metamaterials has predominantly been on their structural attributes, limiting the expansion of bandgaps that are generated through local resonance mechanisms. This study introduces a chiral spiral locally resonant metamaterial (CSLRM) designed to attenuate low-frequency vibrations. The proposed vibration damper, crafted from homogeneous materials, exhibits robust adaptability, high stability, and manufacturability, making it ideal for use in demanding engineering environments. The incorporation of resonators, consisting of chiral helical be ams and mass blocks, into the supporting structure facilitates vibration control within compact spaces. Additionally, a finite element model of th e CSLRM structure was developed, and its dispersion curves and vibration modes were analyzed to explore the bandgap formation mechanism and characterize the bandgap features of the CSLRM structure. This research advances the understanding of how to broaden and tune the bandgaps in locally resonant metamaterials.