Research on frequency response function of the middle ear after hearing aid attached to the eardrum
Date Issued
2015
Date
2015
Author(s)
Huang, Chung-Husan
Abstract
This study created a 3D multi-body model of human middle ear structure. First, the ossicels was considered a rigid body and soft tissues was considered a composition of linear spring. Secondly, we ignored damping effect and external force to derive the equation of motions of whole system. Then solved eigenvalue problem and using these natural frequencies、mode shape and damping ratio of each mode, so we can derive the frequency response function of the middle ear. Finally, we tuned the damping ratio of each mode to fit the frequency response function from paper’s experimental data, as a result, we got the frequency response function of the middle ear by theoretical analysis. We used substructure synthesis method to combine the frequency response function of the middle ear and the frequency response function of hearing aid. We obtained the purpose of this study by combining the frequency response function of the two structures. Then, by transforming the electromagnetic force to current hearing aid, we got the frequency response function between the electromagnetic force and current. According to this function we can achieve the settings of hearing aid.
Subjects
Sound transmission
Middle ear
Frequency response function
Hearing aid
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-104-R02522529-1.pdf
Size
23.54 KB
Format
Adobe PDF
Checksum
(MD5):768de5b010540261c18fd43fbffa9df9