鼓膜の動特性解析 : ヒト鼓膜のヤング率, 厚さ, および減衰比について

抄録

Eight temporal bones were extracted from fresh autopsy cases, and the attachment of the eardrum to the temporal bone was examined. Then the dynamic characteristics of the eardrum of the specimen were measured by means of a newly developed measuring apparatus. At the same time, through application of the impedance theory of the tube to the external auditory canal and the energy method to the eardrum, the equation corresponding to the output of the apparatus was obtained. Comparing the measuring result and the numerical result, the adult average values of Young's modulus E_E, thickness h_E, and damping ratio ξ_E=c_E/2(m_Ek_E)^1/2 were determined to be E_E=3.2×10⁷ N/m², h_E=0.1 mm, and ξ_E=0.2.