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Crystals 2016, 6(9), 112;

Coupled Acoustic-Mechanical Bandgaps

Department of Electrical Engineering, Centre for Acoustic-Mechanical Micro Systems, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
Author to whom correspondence should be addressed.
Academic Editors: Victor J. Sanchez-Morcillo, Vicent Romero-Garcia, Luis M. Garcia-Raffi and Helmut Cölfen
Received: 30 April 2016 / Revised: 9 August 2016 / Accepted: 5 September 2016 / Published: 8 September 2016
(This article belongs to the Special Issue Phononic Crystals)
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In this work, we study the existence of coupled bandgaps for corrugated plate structures and acoustic channels. The study is motivated by the observation that the performance of traditional bandgap structures, such as periodic plates, may be compromised due to the coupling to a surrounding acoustic medium and the presence of acoustic resonances. It is demonstrated that corrugation of the plate structure can introduce bending wave bandgaps and bandgaps in the acoustic domain in overlapping and audible frequency ranges. This effect is preserved also when taking the physical coupling between the two domains into account. Additionally, the coupling is shown to introduce extra gaps in the band structure due to modal interaction and the appearance of a cut-on frequency for the fundamental acoustic mode. View Full-Text
Keywords: bandgaps; acoustic-mechanical coupling bandgaps; acoustic-mechanical coupling

Figure 1

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Jensen, J.S.; Kook, J. Coupled Acoustic-Mechanical Bandgaps. Crystals 2016, 6, 112.

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