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Wave finite element analysis of an active cochlear model

Wave finite element analysis of an active cochlear model
Wave finite element analysis of an active cochlear model
The wave finite element method has previously been used to understand the various types of wave in a passive cochlear model. In this paper the model is extended to give an initial representation of an active cochlea by making the real and imaginary components of the Young's modulus, that defines the local dynamics of the plates representing the basilar membrane, position and frequency dependent. At a given excitation frequency the distribution of the Young's modulus is chosen so that the mechanical impedance of the plate elements correspond to that obtained from a lumped parameter model of the active cochlea. The types of wave predicted in this representation of the active cochlea are similar to those observed for the passive cochlea model and consist of a fast wave, a slow wave and a large number of higher-order fluid modes, which are evanescent. Although the results of the full finite element analysis for this active model are very different from the passive one, the decomposition into wave components still shows that the slow wave dominates the response along most of the cochlear length, until the response peaks, when a number of higher-order fluid modes are locally excited
1939-800X
050114
Ni, Guangjian
f6ddc112-7d81-403a-b97a-7ecbc8fd4e59
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Ni, Guangjian
f6ddc112-7d81-403a-b97a-7ecbc8fd4e59
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567

Ni, Guangjian and Elliott, S.J. (2013) Wave finite element analysis of an active cochlear model. Proceedings of Meetings on Acoustics, 19, 050114. (doi:10.1121/1.4798803).

Record type: Article

Abstract

The wave finite element method has previously been used to understand the various types of wave in a passive cochlear model. In this paper the model is extended to give an initial representation of an active cochlea by making the real and imaginary components of the Young's modulus, that defines the local dynamics of the plates representing the basilar membrane, position and frequency dependent. At a given excitation frequency the distribution of the Young's modulus is chosen so that the mechanical impedance of the plate elements correspond to that obtained from a lumped parameter model of the active cochlea. The types of wave predicted in this representation of the active cochlea are similar to those observed for the passive cochlea model and consist of a fast wave, a slow wave and a large number of higher-order fluid modes, which are evanescent. Although the results of the full finite element analysis for this active model are very different from the passive one, the decomposition into wave components still shows that the slow wave dominates the response along most of the cochlear length, until the response peaks, when a number of higher-order fluid modes are locally excited

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More information

Published date: 2 June 2013
Venue - Dates: Proceedings of Meetings on Acoustics, Montreal, Canada, Canada, 2013-06-02
Organisations: Signal Processing & Control Grp

Identifiers

Local EPrints ID: 356938
URI: http://eprints.soton.ac.uk/id/eprint/356938
ISSN: 1939-800X
PURE UUID: 1d519174-21e5-424b-bac8-990e3e6fbb9f
ORCID for Guangjian Ni: ORCID iD orcid.org/0000-0002-9240-3020

Catalogue record

Date deposited: 03 Oct 2013 10:08
Last modified: 14 Mar 2024 14:54

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Contributors

Author: Guangjian Ni ORCID iD
Author: S.J. Elliott

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