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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
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Partially embedded metabarrier to suppress surface waves in granular mediaa)
Lalith Sai Srinivas Pillarisetti1, Cliff J Lissenden1, Parisa Shokouhi1
1Department of Engineering Science and Mechanics, Penn State, University Park, Pennsylvania 16802, USA.
The Journal of the Acoustical Society of America
|September 9, 2024
Summary
This study introduces novel metabarriers for granular media, effectively suppressing surface waves (PSV1 and PSV2 modes) through resonator hybridization. Experimental validation confirms their potential for vibration control and seismic isolation.
Area of Science:
- Geophysics
- Materials Science
- Acoustics
Background:
- Gravity-induced heterogeneity in granular media creates complex dispersive surface waves.
- Existing metabarriers primarily address homogeneous media, neglecting heterogeneous scenarios.
- Suppression of specific surface wave modes (PSV1, PSV2) is crucial for vibration control.
Purpose of the Study:
- To propose and analyze a novel metabarrier design for suppressing surface waves in heterogeneous granular media.
- To investigate the hybridization mechanisms between surface waves and resonator modes.
- To experimentally validate the proposed metabarrier's effectiveness.
Main Methods:
- Unit-cell dispersion analysis to understand wave propagation.
- Frequency-domain finite element analysis for mode hybridization.
- Experimental realization in a granular testbed with 3D-printed resonators.
Main Results:
- Successful hybridization of PSV1 with longitudinal resonator resonance and PSV2 with flexural resonator resonance.
- Demonstrated suppression of PSV1 and PSV2 modes through engineered bandgaps.
- Experimental validation of the proposed metabarrier in a granular medium.
Conclusions:
- The proposed metabarrier effectively suppresses fundamental dispersive surface wave modes in heterogeneous granular media.
- Tailoring resonator properties enables control over specific wave modes.
- Graded metabarriers show promise for broad-frequency vibration control and seismic isolation.
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