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Article: A tunable electromagnetic acoustic switch

TitleA tunable electromagnetic acoustic switch
Authors
KeywordsLONG-WAVELENGTH PROPAGATION
COMPOSITE ELASTIC MEDIA
Issue Date2020
PublisherAIP Publishing LLC. The Journal's web site is located at http://scitation.aip.org/content/aip/journal/apl
Citation
Applied Physics Letters, 2020, v. 116, p. article no. 183502 How to Cite?
AbstractAn acoustic switch permits or forbids sound transmission through a partition, and its performance is governed by the stiffness and mass laws at low and high frequencies, respectively. The mechanism of artificial mass and stiffness, either positive or negative, is required to break these laws; all are demonstrated experimentally in this study. The switch consists of a suspended diaphragm with electric moving coil and a magnetic field, shunted by an essentially passive analog circuit. We show that electrically mediated damping is extremely large, and its mechanism as a powerful wave stopper can be very broadband, which contrasts with most resonance-based devices in the literature. We also show that a serial shunt capacitor introduces a mechanical mass that softens the diaphragm spring at low frequencies, while a shunt inductance is an electromagnetic spring that pacifies mechanical inertia at high frequencies. By manipulating the dynamic mass, stiffness, and damping electronically to enhance or defy the mass law and stiffness law, a switch effective in over one octave and working at a deep subwavelength scale is realized, and the maximum switch ratio is as high as 28 dB. As circuits can be miniaturized and easily tuned, these illustrated physics point to a versatile tool for digital control of sound waves. This work was supported by the National Science Foundation of China, Project No. 51775467, and a block grant from the Hangzhou Municipal Government. The data that support the findings of this study are available within this article.
Persistent Identifierhttp://hdl.handle.net/10722/284086
ISSN
2019 Impact Factor: 3.597
2015 SCImago Journal Rankings: 1.105
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZHANG, Y-
dc.contributor.authorWang, C-
dc.contributor.authorHuang, L-
dc.date.accessioned2020-07-20T05:55:58Z-
dc.date.available2020-07-20T05:55:58Z-
dc.date.issued2020-
dc.identifier.citationApplied Physics Letters, 2020, v. 116, p. article no. 183502-
dc.identifier.issn0003-6951-
dc.identifier.urihttp://hdl.handle.net/10722/284086-
dc.description.abstractAn acoustic switch permits or forbids sound transmission through a partition, and its performance is governed by the stiffness and mass laws at low and high frequencies, respectively. The mechanism of artificial mass and stiffness, either positive or negative, is required to break these laws; all are demonstrated experimentally in this study. The switch consists of a suspended diaphragm with electric moving coil and a magnetic field, shunted by an essentially passive analog circuit. We show that electrically mediated damping is extremely large, and its mechanism as a powerful wave stopper can be very broadband, which contrasts with most resonance-based devices in the literature. We also show that a serial shunt capacitor introduces a mechanical mass that softens the diaphragm spring at low frequencies, while a shunt inductance is an electromagnetic spring that pacifies mechanical inertia at high frequencies. By manipulating the dynamic mass, stiffness, and damping electronically to enhance or defy the mass law and stiffness law, a switch effective in over one octave and working at a deep subwavelength scale is realized, and the maximum switch ratio is as high as 28 dB. As circuits can be miniaturized and easily tuned, these illustrated physics point to a versatile tool for digital control of sound waves. This work was supported by the National Science Foundation of China, Project No. 51775467, and a block grant from the Hangzhou Municipal Government. The data that support the findings of this study are available within this article.-
dc.languageeng-
dc.publisherAIP Publishing LLC. The Journal's web site is located at http://scitation.aip.org/content/aip/journal/apl-
dc.relation.ispartofApplied Physics Letters-
dc.subjectLONG-WAVELENGTH PROPAGATION-
dc.subjectCOMPOSITE ELASTIC MEDIA-
dc.titleA tunable electromagnetic acoustic switch-
dc.typeArticle-
dc.identifier.emailHuang, L: lixi.huang@hku.hk-
dc.identifier.authorityHuang, L=rp00119-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1063/5.0008532-
dc.identifier.scopuseid_2-s2.0-85092574128-
dc.identifier.hkuros311398-
dc.identifier.volume116-
dc.identifier.spagearticle no. 183502-
dc.identifier.epagearticle no. 183502-
dc.identifier.isiWOS:000532287900002-
dc.publisher.placeUnited States-
dc.identifier.issnl0003-6951-

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