DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Da-Young | ko |
dc.contributor.author | Ih, Jeong-Guon | ko |
dc.contributor.author | Abom, Mats | ko |
dc.date.accessioned | 2019-11-12T05:20:06Z | - |
dc.date.available | 2019-11-12T05:20:06Z | - |
dc.date.created | 2019-11-01 | - |
dc.date.created | 2019-11-01 | - |
dc.date.created | 2019-11-01 | - |
dc.date.issued | 2020-02 | - |
dc.identifier.citation | JOURNAL OF SOUND AND VIBRATION, v.466, pp.115045 | - |
dc.identifier.issn | 0022-460X | - |
dc.identifier.uri | http://hdl.handle.net/10203/268338 | - |
dc.description.abstract | This study is on the practical application of the acoustic metamaterials to the design of a silencer with high acoustic and geometric efficiencies, and negligible pressure drop. The object is to achieve broadband and low-frequency attenuation simultaneously by combining the effects of resonance, periodicity, phase difference, and impedance mismatch. An array of multiple small resonators, which is periodically applied to the wall of a duct, invokes the dispersion of sound propagating in the duct. This phenomenon is implemented to construct a virtual Herschel-Quincke (HQ) tube system. The main duct is split into two parallel ducts of the same length: a rigid duct and a duct with a wall covered by the periodic resonators. For a modelling of sound propagation in a dispersive duct, the phase speed of sound is analytically derived in the presence of a mean flow. Also, the attenuation conditions of the virtual HQ tube are proposed to establish a guideline in selecting the proper design parameters for achieving the required transmission loss (TL) in the desired frequency range. The predicted TL spectra are compared with the test results, for a virtual HQ tube system with 9 identical quarter-wavelength tube resonators, and they generally agree well. With increasing flow speed, the amount of attenuation decreases a bit, but the general spectral characteristics are maintained for |M|≤0.1. Based on the same principle, the acoustic metamaterials (AMM) are applied to the practical silencer design to achieve the wide-band sound reduction at low- to mid-frequencies for a given small space. A virtual HQ tube having 26 cells of AMM is tested, of which a cell is composed of 3 types of quarter-wavelength tube resonators. The experiment well validates the predicted TL. The results show that TL is at least 5 dB for a wide frequency range of 230–1000 Hz. The additional volume due to the attachment of the AMM layer is only 40%, while the TL is far larger than that of the simple expansion chamber or the dissipative silencer having the same excess volume. | - |
dc.language | English | - |
dc.publisher | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD | - |
dc.title | Virtual Herschel-Quincke tube using the multiple small resonators and acoustic metamaterials | - |
dc.type | Article | - |
dc.identifier.wosid | 000500341100004 | - |
dc.identifier.scopusid | 2-s2.0-85074370180 | - |
dc.type.rims | ART | - |
dc.citation.volume | 466 | - |
dc.citation.beginningpage | 115045 | - |
dc.citation.publicationname | JOURNAL OF SOUND AND VIBRATION | - |
dc.identifier.doi | 10.1016/j.jsv.2019.115045 | - |
dc.contributor.localauthor | Ih, Jeong-Guon | - |
dc.contributor.nonIdAuthor | Abom, Mats | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Herschel-Quincke tube | - |
dc.subject.keywordAuthor | Periodic resonators | - |
dc.subject.keywordAuthor | Acoustic metamaterials | - |
dc.subject.keywordAuthor | Transmission loss | - |
dc.subject.keywordAuthor | Silencer | - |
dc.subject.keywordPlus | SLOW SOUND | - |
dc.subject.keywordPlus | DUCT | - |
dc.subject.keywordPlus | FLOW | - |
dc.subject.keywordPlus | ATTENUATION | - |
dc.subject.keywordPlus | IMPEDANCE | - |
dc.subject.keywordPlus | MATRIX | - |
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