< back to main site

Publications

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

Bravo, A*; Barham, R G; Ruiz, M*; Lopez, J M*; De Arcas, G*; Recuero, M* (2008) A new 3-D finite element model of the IEC 60318-1 artificial ear. Metrologia, 45 (4). pp. 448-458.

Full text not available from this repository.

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 like narrow tubes, annular slits or over sharp corner, noticeable thermal and viscous effects take place causing further departure from the lumped parameter model. A new numerical model has therefore been developed, that gives proper consideration to the aforementioned effects. Both kinds of losses can be simulated by means of the LMS Virtual Lab acoustic software which facilitate 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 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.

Item Type: Article
Keywords: IEC 60318 ear simulator, acoustic couplers, Electroacoustics, Three-dimensional Finite Element Model, Lumped Parameter Model, Thermal and Viscosity Losses, Narrow Conduits, Lumped Parameter Model, Thermal and Viscosity Losses
Subjects: Acoustics
Acoustics > Sound in Air
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4225

Actions (login required)

View Item View Item