| A multiphysics model of hearing aid vibroacoustics using finite elements. | |
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MedLine Citation:
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PMID: 20330494 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Electromagnetic balanced armature receivers [Hunt, Electroacoustics, Chap. 7] are used exclusively to generate acoustic output in hearing aids. These transducers are much more efficient than electrodynamic transducers and are capable of delivering upward of 140 dB of sound pressure to person. In an effort to maximize system gain in a hearing aid, vibroacoustical feedback paths originating from the receiver are modeled using finite elements. Given an electrical excitation, the electromagnetic-mechanical force on the armature is solved as a function of frequency. The force on this armature vibrates an internal diaphragm, which generates acoustic output while vibrating the entire hearing aid. Assuming that there are no acoustical leaks in the design, vibroacoustical coupling limits the usable gain of the aid. Using commercially available software, the fluid is modeled with full Navier-Stokes elements and is coupled to all structural boundaries. The armature is "kicked" with the aforementioned force, and spectral analysis is used to study mechanical transmissibility within and vibroacoustic reradiation around the hearing aid. |
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Authors:
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Thomas Burns; Dave Tourtelotte |
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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: 1849 Citation Subset: IM |
Affiliation:
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Starkey Labs., Inc., Eden Prairie, MN 55344. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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