Tuck-Lee James P, Pinsky Peter M, Steele Charles R, Puria Sunil
Department of Mechanical Engineering, Stanford University Stanford, California 94305, USA.
J Acoust Soc Am. 2008 Jul;124(1):348-62. doi: 10.1121/1.2912438.
The function of the middle ear is to transfer acoustic energy from the ear canal to the cochlea. An essential component of this system is the tympanic membrane. In this paper, a new finite element model of the middle ear of the domestic cat is presented, generated in part from cadaver anatomy via microcomputed tomographic imaging. This model includes a layered composite model of the eardrum, fully coupled with the acoustics in the ear canal and middle-ear cavities. Obtaining the frequency response from 100 Hz to 20 kHz is a computationally challenging task, which has been accomplished by using a new adaptive implementation of the reduced-order matrix Padé-via-Lanczos algorithm. The results are compared to established physiological data. The fully coupled model is applied to study the role of the collagen fiber sublayers of the eardrum and to investigate the relationship between the structure of the middle-ear cavities and its function. Three applications of this model are presented, demonstrating the shift in the middle-ear resonance due to the presence of the septum that divides the middle-ear cavity space, the significance of the radial fiber layer on high frequency transmission, and the importance of the transverse shear modulus in the eardrum microstructure.
中耳的功能是将声能从耳道传递至耳蜗。该系统的一个重要组成部分是鼓膜。本文介绍了一种家猫中耳的新有限元模型，部分是通过微计算机断层扫描成像从尸体解剖生成的。该模型包括鼓膜的分层复合模型，与耳道和中耳腔中的声学完全耦合。获得100赫兹至20千赫兹的频率响应是一项计算上具有挑战性的任务，这是通过使用降阶矩阵帕德 - 兰索斯算法的新自适应实现来完成的。将结果与已有的生理数据进行比较。完全耦合模型用于研究鼓膜胶原纤维子层的作用，并研究中耳腔结构与其功能之间的关系。给出了该模型的三个应用，展示了由于分隔中耳腔空间的隔膜的存在导致的中耳共振的变化、径向纤维层对高频传输的重要性以及鼓膜微观结构中横向剪切模量的重要性。
