人耳鼓膜病变数值分析

目的研究鼓膜厚度和硬度对人耳传声的影响。方法利用CT获取志愿者耳部结构临床资料,使用Matlab软件提取相关结构的边界,将边界文件导入ANSYS建立人耳结构数值有限元模型。结果利用本文人耳数值模型,在外耳道口施加105dB声压,进行200～8000Hz频率范围的谐响应分析。以此研究在鼓膜病变情况下,鼓膜和镫骨底板位移幅值的变化规律。结论用数值方法解释了鼓膜病变对传声的影响,为鼓膜修补提供了力学参考。

Numerical analysis of pathologic tympanic membrane of human ear

Objective To study the effects of thickness and stiffness of tympanic membrane on sound transmission of human ear. Methods A healthy living volunteer is scanned using spiral CT to obtain the whole temporal bone showing. The images are digitized by Matlab program along the outlines of the ear structures. The digitized outlines are then imported into ANSYS to construct a three-dimensional finite element model of the human ear.R esults The uniform pressure of 105 dB is applied on the entrance of the ear canal, and the harmonic analysis is calculated on the model within the frequency range of 200-8000 Hz. The model is set to analyze the displacement change of tympanic membrane and stapes footplate of the pathologic tympanic membrane.C onclusion The principle of sound transmission was explained based on the numerical method. The results may provide the useful mechanical reference for tympanic membrane reconstruction.