Fluid coupling in a discrete model of cochlear mechanics
Fluid coupling in a discrete model of cochlear mechanics
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.
acoustic wave propagation, bioacoustics, biological fluid dynamics, ear, hearing, linear algebra, nonlinear acoustics, physiological models
1441-1451
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Lineton, Ben
1ace4e96-34da-4fc4-bc17-a1d82b2ba0e2
Ni, Guangjian
f6ddc112-7d81-403a-b97a-7ecbc8fd4e59
September 2011
Elliott, Stephen J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Lineton, Ben
1ace4e96-34da-4fc4-bc17-a1d82b2ba0e2
Ni, Guangjian
f6ddc112-7d81-403a-b97a-7ecbc8fd4e59
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), .
(doi:10.1121/1.3607420).
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.
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Published date: September 2011
Keywords:
acoustic wave propagation, bioacoustics, biological fluid dynamics, ear, hearing, linear algebra, nonlinear acoustics, physiological models
Organisations:
Human Sciences Group, Signal Processing & Control Grp
Identifiers
Local EPrints ID: 198859
URI: http://eprints.soton.ac.uk/id/eprint/198859
ISSN: 0001-4966
PURE UUID: d0d17f77-b672-45b6-a377-7b32a27961e9
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Date deposited: 07 Oct 2011 16:08
Last modified: 15 Mar 2024 03:15
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Author:
Guangjian Ni
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