Efficient sound radiation using a bandgap structure

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Abstract

This work reports on the use of bandgaps to increase the efficiency of sound radiation employing defect modes on a phononic crystal (PnC). A PnC consisting of a 2D array of studs on an aluminum plate is considered, and a defect is created by removing four studs. Numerical simulations predict 8 dB higher radiation efficiency and significantly more uniform directivity of sound due to the piston-like defect modes that suppress interference between acoustic waves. An experimental study of the vibrational response is carried out in order to validate the numerical result. Comparisons of the radiation efficiency and the directivity index between the numerical and experimental results show good agreement. These findings may pave the way to use bandgap structures as effective acoustic radiators.

Original languageEnglish
Article number041903
JournalApplied Physics Letters
Volume115
Issue number4
Number of pages6
ISSN0003-6951
DOIs
Publication statusPublished - 22 Jul 2019

Cite this

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title = "Efficient sound radiation using a bandgap structure",
abstract = "This work reports on the use of bandgaps to increase the efficiency of sound radiation employing defect modes on a phononic crystal (PnC). A PnC consisting of a 2D array of studs on an aluminum plate is considered, and a defect is created by removing four studs. Numerical simulations predict 8 dB higher radiation efficiency and significantly more uniform directivity of sound due to the piston-like defect modes that suppress interference between acoustic waves. An experimental study of the vibrational response is carried out in order to validate the numerical result. Comparisons of the radiation efficiency and the directivity index between the numerical and experimental results show good agreement. These findings may pave the way to use bandgap structures as effective acoustic radiators.",
author = "Jaesoon Jung and Jeong, {Cheol Ho} and Jensen, {Jakob S.}",
year = "2019",
month = "7",
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doi = "10.1063/1.5110296",
language = "English",
volume = "115",
journal = "Applied Physics Letters",
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publisher = "American Institute of Physics",
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Efficient sound radiation using a bandgap structure. / Jung, Jaesoon; Jeong, Cheol Ho; Jensen, Jakob S.

In: Applied Physics Letters, Vol. 115, No. 4, 041903, 22.07.2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Efficient sound radiation using a bandgap structure

AU - Jung, Jaesoon

AU - Jeong, Cheol Ho

AU - Jensen, Jakob S.

PY - 2019/7/22

Y1 - 2019/7/22

N2 - This work reports on the use of bandgaps to increase the efficiency of sound radiation employing defect modes on a phononic crystal (PnC). A PnC consisting of a 2D array of studs on an aluminum plate is considered, and a defect is created by removing four studs. Numerical simulations predict 8 dB higher radiation efficiency and significantly more uniform directivity of sound due to the piston-like defect modes that suppress interference between acoustic waves. An experimental study of the vibrational response is carried out in order to validate the numerical result. Comparisons of the radiation efficiency and the directivity index between the numerical and experimental results show good agreement. These findings may pave the way to use bandgap structures as effective acoustic radiators.

AB - This work reports on the use of bandgaps to increase the efficiency of sound radiation employing defect modes on a phononic crystal (PnC). A PnC consisting of a 2D array of studs on an aluminum plate is considered, and a defect is created by removing four studs. Numerical simulations predict 8 dB higher radiation efficiency and significantly more uniform directivity of sound due to the piston-like defect modes that suppress interference between acoustic waves. An experimental study of the vibrational response is carried out in order to validate the numerical result. Comparisons of the radiation efficiency and the directivity index between the numerical and experimental results show good agreement. These findings may pave the way to use bandgap structures as effective acoustic radiators.

U2 - 10.1063/1.5110296

DO - 10.1063/1.5110296

M3 - Journal article

VL - 115

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 4

M1 - 041903

ER -