Single-phase metabeam for three-directional broadband vibration suppression

Abstract

Metabeams are one of the most explored metastructures owing to their unique bandgap behavior that can be utilized to control vibrations of beam-type structures. Although various metabeams have been developed, realizing a metabeam enabling a broadband suppression of multi-directional vibrations is still a challenge if the added weight of local resonators is limited. In this work, we proposed a single-phase metabeam consisting of a host beam and a periodic array of local resonators with flexible tunability of multi-polarization modes. Through an elaborate design of the resonators and exploiting of bandgap coupling effects, we demonstrated theoretically and experimentally that the proposed single-phase metabeam, even if fabricated with a small added resonator weight, can achieve significant three-directional vibration suppression in a broadband frequency range. A typical verified example showed that the proposed metabeam can realize more than four times the vibration attenuation bandwidth of the conventional deep-subwavelength metabeam designed with the same added resonator mass ratio.