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Finite Element Model of an Ear Simulator Pierre Gélat and Richard Barham 3 April 2003
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Background An ear simulator is a standardised device used for the calibration and characterisation of audiometers, earphones, and telecommunications and audio equipment. Two types of ear simulator are widely used: the artificial ear standardised in IEC 60318-1 and the acoustic coupler standardised in IEC 60318-3.
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Acoustic coupler and artificial ear
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Description The internal design of an artificial ear consists of three interconnected volumes to provide a complex impedance that mimics the nominal human ear This is modelled using a lumped parameter approach, but its validity becomes questionable beyond a certain frequency. A finite element model of the artificial ear has no such limitation. It can be used to: – validate the lumped parameter model – model the characteristics of the ear simulator at higher frequencies
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Artificial Ear Diagram V 2 =1800 mm 3 V 3 =7500 mm 3 R1R1 L 2 R 2 L 3 R 3 Microphone V 1 =2500 mm 3 25mm
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Axisymmetric model of artificial ear: pressure contours at 8 kHz
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Conclusions Poor agreement with lumped parameter model Need to include viscosity effects Working with PACSYS Ltd. to develop 1-D and 2-D viscous fluid finite elements
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