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Comparing methods of modeling near field fluid coupling in the cochlea
- Source :
- The Journal of the Acoustical Society of America. 137:1309-1317
- Publication Year :
- 2015
- Publisher :
- Acoustical Society of America (ASA), 2015.
-
Abstract
- As well as generating the far field pressure, which allows wave propagation in the cochlea, the vibration of an individual element of the basilar membrane (BM) will also generate a near field pressure, which increases its mass and gives rise to local longitudinal coupling. This paper compares the efficiency and accuracy of a number of different methods of calculating the near field pressure distribution, and explores the connections between them. In particular it is shown that a common approximation to the wavenumber description of the near field pressure is equivalent, in the spatial domain, to an exponential decay away from the point of excitation. Two important properties of the near field pressure are its maximum amplitude, which is finite if the vibrating element has a finite length, and the value of its spatial integral, which determines the added mass on the BM due to the fluid loading. These properties are calculated as a function of the BM width relative to the width of the fluid chamber. By parameterizing the near field pressure variation in this way, it can be readily incorporated into coupled models of the cochlea, without the considerable computational expense of calculating the full three dimensional pressure field.
- Subjects :
- Acoustics and Ultrasonics
Membrane Fluidity
Wave propagation
Movement
Finite Element Analysis
Near and far field
Mechanotransduction, Cellular
Models, Biological
Vibration
Optics
Hearing
Arts and Humanities (miscellaneous)
Pressure
Animals
Humans
Wavenumber
Computer Simulation
Exponential decay
Added mass
Physics
Fourier Analysis
business.industry
Mechanics
Basilar Membrane
Finite element method
Cochlea
Basilar membrane
Acoustic Stimulation
business
Excitation
Subjects
Details
- ISSN :
- 00014966
- Volume :
- 137
- Database :
- OpenAIRE
- Journal :
- The Journal of the Acoustical Society of America
- Accession number :
- edsair.doi.dedup.....6cf160ab7ddc6269d697c41650f4b58f