<p>Acoustic metamaterials are artificially engineered smart structures designed to achieve unusual properties that cannot be possible to obtain through natural materials. Hence, with the advancement of technology, metamaterials have received tremendous focus in recent days. Phononic and sonic crystals are the two classes of the acoustic metamaterial. The frequency stop band is one of the common and primary features that can be attained from both the classes of acoustic metamaterials. Unit cell sonic crystals are composed of stiff resonators, placed inside comparatively softer matrix material. The frequency band gap in a sonic crystal is a result of Bragg scattering and local resonance of the resonators in the unit cell. In this study, a comprehensive analysis is performed to understand the influence of resonators on frequency stop bands and the range/width of the band gap. Two frequency bands in a dispersion curve form a band gap. How and why those two bands shift up/down in a dispersion curve to increase/decrease the band gap width, is studied extensively. It is established that resonator geometry and dimension in the unit cell possess a vital role in manipulating the frequency bands. To advance the understanding, this study is focused on analyzing the influence of volume percentage of resonators in a unit cell. Mode shapes are studied extensively to better understand the results and make conclusive arguments.</p>

Understanding the Influence of Resonators on Frequency Band Gaps in Sonic Crystal Metamaterials

Paper Proceedings: https://asmedigitalcollection.asme.org/SMASIS/SMASIS2021/volume/85499

ASME 2021 Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS2021)

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