Modeling of Sound Transmission from Ear Canal to Cochlea |
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Authors: | Rong Z Gan Brian P Reeves Xuelin Wang |
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Institution: | (1) School of Aerospace & Mechanical Engineering and Bioengineering Center, University of Oklahoma, 865 Asp Avenue, Room 200, Norman, OK 73019, USA |
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Abstract: | A 3-D finite element (FE) model of the human ear consisting of the external ear canal, middle ear, and cochlea is reported
in this paper. The acoustic-structure-fluid coupled FE analysis was conducted on the model which included the air in the ear
canal and middle ear cavity, the fluid in the cochlea, and the middle ear and cochlea structures (i.e., bones and soft tissues).
The middle ear transfer function such as the movements of tympanic membrane, stapes footplate, and round window, the sound
pressure gain across the middle ear, and the cochlear input impedance in response to sound stimulus applied in the ear canal
were derived and compared with the published experimental measurements in human temporal bones. The frequency sensitivity
of the basilar membrane motion and intracochlear pressure induced by sound pressure in the ear canal was predicted along the
length of the basilar membrane from the basal turn to the apex. The satisfactory agreements between the model and experimental
data in the literature indicate that the middle ear function was well simulated by the model and the simplified cochlea was
able to correlate sound stimulus in the ear canal with vibration of the basilar membrane and pressure variation of the cochlear
fluid. This study is the first step toward the development of a comprehensive FE model of the entire human ear for acoustic-mechanical
analysis. |
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Keywords: | Middle ear Cochlea Finite element model Sound transmission |
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