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Published September 7, 2013 | Published
Journal Article Open

Granular metamaterials for vibration mitigation


Acoustic metamaterials that allow low-frequency band gaps are interesting for many practical engineering applications, where vibration control and sound insulation are necessary. In most prior studies, the mechanical response of these structures has been described using linear continuum approximations. In this work, we experimentally and theoretically address the formation of low-frequency band gaps in locally resonant granular crystals, where the dynamics of the system is governed by discrete equations. We investigate the quasi-linear behavior of such structures. The analysis shows that a stopband can be introduced at about one octave lower frequency than in materials without local resonances. Broadband and multi-frequency stopband characteristics can also be achieved by strategically tailoring the non-uniform local resonance parameters.

Additional Information

© 2013 American Institute of Physics Publishing LLC. Received 23 June 2013; accepted 21 August 2013; published online 6 September 2013. We acknowledge support from this work from the United Technology Research Center and from the Army Research Office MURI Grant No. US ARO W911NF-09-1-0436.

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