A new 3D finite element model of the IEC 60318-1 artificial ear

Bravo, Agustin and Ruiz González, Mariano and Barham, Richard and López Navarro, Juan Manuel and Arcas Castro, Guillermo de and Recuero López, Manuel (2008). A new 3D finite element model of the IEC 60318-1 artificial ear. "Metrologia", v. 45 (n. 4); pp. 448-458. ISSN 0026-1394. https://doi.org/10.1088/0026-1394/45/4/011.

Description

Title: A new 3D finite element model of the IEC 60318-1 artificial ear
Author/s:
  • Bravo, Agustin
  • Ruiz González, Mariano
  • Barham, Richard
  • López Navarro, Juan Manuel
  • Arcas Castro, Guillermo de
  • Recuero López, Manuel
Item Type: Article
Título de Revista/Publicación: Metrologia
Date: July 2008
ISSN: 0026-1394
Volume: 45
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Mecánica y de Fabricación [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The artificial ear specified in IEC 60318-1 is used for the measurement of headphones and has been designed to present an acoustic load equivalent to that of normal human ears. In this respect it is specified in terms of an acoustical impedance, and modelled by a lumped parameter approach. However, this has some inherent frequency limitations and becomes less valid as the acoustic wavelength approaches the characteristic dimensions within the device. In addition, when sound propagates through structures such as narrow tubes, annular slits or over sharp corners, noticeable thermal and viscous effects take place causing further departure from the lumped parameter model. A new numerical model has therefore been developed, which gives proper consideration to the aforementioned effects. Both kinds of losses can be simulated by means of the LMS Virtual Lab acoustic software which facilitates finite and boundary element modelling of the whole artificial ear. A full 3D model of the artificial ear has therefore been developed based on key dimensional data found in IEC 60318-1. The model has been used to calculate the acoustical impedance, and the results compared with the corresponding data determined from the lumped parameter model. The numerical simulation of the artificial ear has been shown to provide realistic results, and is a powerful tool for developing a detailed understanding of the device. It is also proving valuable in the revision of IEC 60318-1 that is currently in progress.

More information

Item ID: 2443
DC Identifier: http://oa.upm.es/2443/
OAI Identifier: oai:oa.upm.es:2443
DOI: 10.1088/0026-1394/45/4/011
Official URL: http://www.iop.org/EJ/toc/0026-1394/45/4
Deposited by: Memoria Investigacion
Deposited on: 04 Mar 2010 09:33
Last Modified: 20 Apr 2016 12:08
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