Gan Rong Z, Sun Qunli, Feng Bin, Wood Mark W
School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, 73019, USA.
Med Eng Phys. 2006 Jun;28(5):395-404. doi: 10.1016/j.medengphy.2005.07.018. Epub 2005 Aug 24.
A three-dimensional (3D) finite element (FE) model of human ear with accurate structural geometry of the external ear canal, tympanic membrane (TM), ossicles, middle ear suspensory ligaments, and middle ear cavity has been recently reported by our group. In present study, this 3D FE model was modified to include acoustic-structural interfaces for coupled analysis from the ear canal through the TM to middle ear cavity. Pressure distributions in the canal and middle ear cavity at different frequencies were computed under input sound pressure applied at different locations in the canal. The spectral distributions of middle ear pressure at the oval window, round window, and medial site of the umbo were calculated and the results demonstrated that there was no significant difference of pressures between those locations at frequency below 3.5 kHz. Finally, the influence of TM perforation on pressure distributions in the canal and middle ear cavity was investigated for perforations in the inferior-posterior and inferior sites of the TM in the FE model and human temporal bones. The results show that variation of middle ear pressure is related to the perforation type and location, and is sensitive to frequency.
最近我们团队报道了一个具有精确外耳道、鼓膜（TM）、听小骨、中耳悬韧带和中耳腔结构几何形状的人耳三维（3D）有限元（FE）模型。在本研究中，对该3D FE模型进行了修改，以纳入声学 - 结构界面，用于从外耳道通过鼓膜到中耳腔的耦合分析。在耳道不同位置施加输入声压的情况下，计算了不同频率下耳道和中耳腔内的压力分布。计算了椭圆窗、圆窗和鼓膜脐内侧部位的中耳压力频谱分布，结果表明在3.5 kHz以下频率时，这些位置之间的压力没有显著差异。最后，针对FE模型和人类颞骨中鼓膜后下部和下部的穿孔，研究了鼓膜穿孔对耳道和中耳腔内压力分布的影响。结果表明，中耳压力变化与穿孔类型和位置有关，并且对频率敏感。
