| A comparison of visco-thermal models for the vibro-acoustic analysis of hearing aids. | |
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MedLine Citation:
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PMID: 20330140 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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The performance of a hearing aid is directly related to its vibro-acoustics characteristics, which must be taken in account during the design process. Different vibro-acoustic aspects of a hearing aid may be analyzed, including the structural transmission from the loudspeaker to the microphone, which may lead to an unwanted feedback, or the frequency response of the system composed by loudspeaker, tube, earmold and ear channel (considering a behind-the-ear hearing aid). In view of the reduced dimensions of the system it is argued that the vibro-acoustic analysis of such system must take in account visco-thermal effects in the description of the propagation of acoustical waves. In this paper, a simplified system is considered including the loudspeaker membrane, tube, and coupler (element commonly used for testing hearing aids). Results for three different approaches for the vibro-acoustic analysis of the system are compared with experimental data: (i) standard acoustical wave model, (ii) the low reduced frequency model, and (iii) the full linearized Navier-Stokes model. Results show that for the case considered the visco-thermal effects must be taken in account, while the choice between models (ii) and (iii) must be made in view of the system geometry. |
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Authors:
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J?lio A Cordioli; Gustavo Martins; Roberto Jordan |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 127 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 1770 Citation Subset: IM |
Affiliation:
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Federal Univ. of Santa Catarina, Campus Univ.-Trindade, Federal Univ. of Santa Catarina Campus Universitrio-Trindade Florianopolis, SC 88090-400 Brazil, cordioli@emc.ufsc.br. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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