Acoustoelastic phononic metamaterial for isolation of sound and vibrations

Abstract

In this work, a phononic metamaterial that could be applied for both acoustic and elastic wave attenuation is numerically examined. The hollow yablonovite structure with the addition of hollow spheres on a face-centered cubic arrangement is examined numerically, and wide bandgaps are found for the propagation of acoustic and elastic waves. The calculations were performed by using the finite element method. The research includes an investigation of all the geometric parameters of the structure and how the bandgaps are being affected from the values of each parameter. The proposed structure is found to have wide bandgaps for both elastic and acoustic waves. These findings strongly indicate that the proposed acoustoelastic metamaterial is a powerful candidate for several applications such as sound and vibrations attenuation, noise reduction, and acoustic filtering.

Phononic metamaterial for efficient sound attenuation applications

“…The numerical findings of Aravantinos-Zafiris et al 34 show that this new class of metamaterials, and especially the one presented in that work, could provide very wide ABGs and could be the fundamental structural component of several potential applications on sound attenuation. The experimental validation of the performance of the structure, which was named AYSS in Aravantinos-Zafiris et al, 34 is the main goal for bringing out the potential of the proposed structure. The measurement of the Normal Incidence Sound Transmission Loss (STL) of the AYSS metamaterial in an Impedance tube is a safe experimental validation regarding the performance of the structure.…”

“…Aravantinos-Zafiris et al showed numerical evidence for wide Acoustic Band Gaps (ABGs) in a structure that combines the well-known Yablonovite Structure (YS) 33 with spheres in a face-centered cubic (FCC) arrangement. 34 The numerical findings of this work show that when this 3D PhM, named AYSS (Air Yablonovite Structure with Spheres), is considered from air into a solid material, provides wide ABGs. By choosing a suitable lattice constant for the structure, the ABGs can be found into the audible frequency range.…”

“…In Figure 1 the geometric parameters of the unit cell of the structure and the designed specimen are shown. Figure 1 34 the first Acoustic Band Gap (ABG) which was numerically calculated for the case where α = 5mm, R = 0 3…”

“…The formatted ABGs in the AYSS metamaterial which were studied numerically and experimentally in this work are based on the Bragg effect. 34 According to this effect the incident acoustic energy is expected to be reflected backwards from the PhM. When half the wavelength equals the lattice constant the Bragg scattering appears.…”

“…The measurement of the Normal Incidence Sound Transmission Loss (STL) of the AYSS metamaterial in an Impedance tube is a safe experimental validation regarding the performance of the structure. The numerical study of Aravantinos-Zafiris et al 34 provided the best dimensions for the structure, which are attempted to be validated through the experimental procedure of the present work. Furthermore, a numerical model based on the Finite Element Method has been also used to have a better view of the parameters that might affect the experiment.…”