Design and performance evaluation of steel beam members with plate‐type locally resonant metamaterials for vibration control

Abstract

In this study, a plate-type locally resonant metamaterial (PTLRM) is proposed to control bending vibrations and low-frequency noise of civil members. Considering the ease of design, installation, and workability, the PTLRM was fabricated using high-density and soft materials. The PTLRM design includes a resonance frequency calculation of the unit and band gap estimation of the PTLRMscoupled structure. Three indicators were developed and experimentally analyzed to evaluate the vibration attenuation performance of the PTLRM: the response suppression in the resonance of PTLRMs, peak response suppression ratio, and distance between peaks. Experimental results of a 5-m long steel beam with PTLRMs indicated that the bending modal responses of the steel beam were suppressed at frequencies closer to the local resonance of the PTLRM. This showed reasonable agreement with the results of the estimation. The acceleration of the PTLRMs-coupled beam was reduced by up to 98.58% in the frequency response function. The time history of acceleration also decreased significantly over the entire time period. The damping of the soft material had little effect on the bandwidth of the band gap. However, it was found that a proper increase in the damping of the soft material could increase the vibration suppression performance.

Fast topology optimization of phononic crystal‐based metastructures for vibration isolation by deep learning

“…Vibrations within the bandgaps will experience attenuation when they propagate through metastructures. This property facilitates the design of vibration isolation for barriers, beams, floors, and other structures by leveraging metastructures (Brûlé et al., 2020; Choi et al., 2022, 2023). However, the unoptimized bandgap width is often insufficient, and economics also needs to be taken into consideration.…”

Vibration Control Effect of Locally Resonant Metamaterials on Serviceability of Floors: An Analytical Investigation

“…Locally resonant Metamaterials (LRMs) are a type of unit that acts as an absorption device for vibration control. LRMs unit is a mass-spring system consisting of soft material, which is elastic, and hard material, which has high density, and vibration absorption effect appears by forming a bandgap based on local resonance [8].…”

“…The serviceability of CFS floor system is directly affected by floor vibration [6], so it needs to be improved through vibration control, and vibration absorption devices using local resonance have been actively researched [7,8]. However, in the civil field, unlike the acoustic field, small-scale studies of member units are mainly conducted, and large-scale verification of real structures is rarely performed.…”