Fluid coupling in a discrete model of cochlear mechanics


Elliott, Stephen J., Lineton, Ben and Ni, Guangjian (2011) Fluid coupling in a discrete model of cochlear mechanics. Journal of the Acoustical Society of America, 130, (3), 1441-1451. (doi:10.1121/1.3607420 ).

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Description/Abstract

A discrete model of cochlear mechanics is introduced that includes a full, three-dimensional, description of fluid coupling. This formulation allows the fluid coupling and basilar membrane dynamics to be analyzed separately and then coupled together with a simple piece of linear algebra. The fluid coupling is initially analyzed using a wavenumber formulation and is separated into one component due to one-dimensional fluid coupling and one comprising all the other contributions. Using the theory of acoustic waves in a duct, however, these two components of the pressure can also be associated with a far field, due to the plane wave, and a near field, due to the evanescent, higher order, modes. The near field components are then seen as one of a number of sources of additional longitudinal coupling in the cochlea. The effects of non-uniformity and asymmetry in the fluid chamber areas can also be taken into account, to predict both the pressure difference between the chambers and the mean pressure. This allows the calculation, for example, of the effect of a short cochlear implant on the coupled response of the cochlea.

Item Type: Article
ISSNs: 0001-4966 (print)
Keywords: acoustic wave propagation, bioacoustics, biological fluid dynamics, ear, hearing, linear algebra, nonlinear acoustics, physiological models
Subjects: Q Science > QC Physics
Q Science > QH Natural history > QH301 Biology
Q Science > QP Physiology
Divisions: Faculty of Engineering and the Environment > Institute of Sound and Vibration Research > Human Sciences Research Group
Faculty of Engineering and the Environment > Institute of Sound and Vibration Research > Signal Processing & Control Research Group
ePrint ID: 198859
Date Deposited: 07 Oct 2011 16:08
Last Modified: 27 Mar 2014 19:46
URI: http://eprints.soton.ac.uk/id/eprint/198859

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