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Memorias de investigación
Research Publications in journals:
A new 3D finite element model of the IEC 60318-1 artificial ear
Year:2008
Research Areas
  • Electronic
Information
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.
International
Si
JCR
Si
Title
METROLOGIA
ISBN
0026-1394
Impact factor JCR
1,667
Impact info
Volume
45
10.1088/0026-1394/45/4/011
Journal number
4
From page
448
To page
458
Month
JULIO
Ranking
Participants
  • Autor: RICHARD BARHAM (Colaborador)
  • Autor: Mariano Ruiz Gonzalez (UPM)
  • Autor: Guillermo de Arcas Castro (UPM)
  • Autor: AGUSTÍN BRAVO (Colaborador)
  • Autor: Manuel Recuero Lopez (UPM)
  • Autor: Juan Manuel Lopez Navarro (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Investigación en Instrumentación y Acústica Aplicada (I2A2)
  • Departamento: Sistemas Electrónicos y de Control
  • Departamento: Ingeniería Mecánica y de Fabricación
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