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A new 3-D finite element model of the IEC 60318-1 artificial ear. Part II. experimental and numerical validation.

Bravo, A*; Barham, R G; Ruiz, M*; Loacutepez, J M*; De Arcas, G*; Alonso, J* (2012) A new 3-D finite element model of the IEC 60318-1 artificial ear. Part II. experimental and numerical validation. Metrologia, 49 (6). pp. 785-802.

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Abstract

In part I, the feasibility of using three-dimensional finite elements to model the acoustic behavior of IEC 60318-1 artificial ear, was studied and the numerical approach compared with classical lumped elements modeling. It was shown that by using a more complex acoustic model that took account of thermo-viscous effects, geometric shapes and dimensions, it was possible to develop a realistic model. This model then had clear advantages in comparison with the models based on equivalent circuits using lumped parameters. In fact results from finite element (FE) modelling produce a better understanding about the physical phenomena produced inside ear simulator couplers facilitating spatial and temporal visualization of the sound fields produced.
The objective of the present study (part II) is to extend the investigation by validating the numerical calculations against measurements on an ear simulator conforming to IEC 60318-1. For this purpose, an appropriate commercially available device is taken and a complete three-dimensional FE model developed for it. The numerical model is based on key dimensional data obtained with a non-destructive X-ray inspection technique. Measurements of the acoustic transfer impedance have been carried out on the same device at a national measurement institute using the method embodied in IEC 60318-1. Having accounted for the actual device dimensions, the thermo-viscous effects inside narrow slots and holes and environmental condition the results of the numerical modeling were found to be in good agreement with the measured values.

Item Type: Article
Subjects: Acoustics
Acoustics > Sound in Air
Identification number/DOI: 10.1088/0026-1394/49/6/785
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5658

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