摘要
Reducing the vibration transmission in beams is of significant interest,as beams are among the most widely used basic structures in numerous practical engineering applications.However,achieving broadband suppression of multi-polarization low-frequency vibration in beams presents a challenge.This study proposes a single-phase multi-resonant metabeam,which consists of a host beam with subwavelength arrays of tunable local resonators.These resonators exhibit adjustable multi-polarization resonant modes that strongly couple with the host beam,enabling simultaneous suppression of multi-type waves over a broad frequency range.The theoretical analysis demonstrates that under the fixed total added-mass ratio(γ_(total)=1.5),the tailored frequency spacing(δ=25-50 Hz)and the controlled loss factor(η=0.03–0.07)act synergistically to broaden bandgaps through resonant zone overlapping and attenuation peak smoothing.The experimental validation with monolithic three-dimensional(3D)-printed specimens confirms the efficacy of this design in multi-polarization vibration control within a deepsubwavelength bandgap,opening a new avenue for designing multi-polarization vibration suppression structures.
基金
Project supported by the National Natural Science Foundation of China(No.51875569)。
