摘要
目的研究外耳道对鼓膜外表面的增压作用。方法依据1例成年男性颞骨标本的Micro-CT扫描数据,利用Mimics软件、ANSYS软件建立正常成人中耳有限元模型后,计算一定声压刺激及外耳道条件下鼓膜表面的声压分布情况。结果当90 d B SPL(0.632 Pa)均匀声压加载于所建模型外耳道口进行0.2~8 k Hz范围内的谐响应分析时,声压在鼓膜外表面得到增强,且具有频率特异性。于声压直接加载与鼓膜外表面向比,外耳道于0.5、1.0、2.0、3.2、4.0 k Hz使得鼓膜表面声压增加分别为0.038、0.118、0.318、1.478、1.088 Pa,换算为分贝,则鼓膜外表面声压分别增加0.5、1.5、3.5、10.5、8.7 d B。结论有限元模型研究显示外耳道对鼓膜外表面有明显频率特异性的增压作用,于共振频率处最强。进一步颞骨实验研究将加深该领域认知。
OBJECTIVE To study the sound pressure gain from external auditory canal(EAC) on the tympanic membrane(TM). METHODS A finite element model(FEM) was developed with Mimics and Ansys based on the data of a temporal bone specimen from Micro-CT scanning, with which the distribution of sound pressure level outside tympanic membrane was simulated. RESULTS As 90 d B SPL(0.632 Pa) was applied on the lateral side of EAC, the sound pressure levels at certain points around the umbo of tympanic membrane were calculated. Compared with the applied sound pressure, the sound pressure gain(SPG) from the EAC was found to be frequency dependent. At frequency 0.5,1.0,2.0,3.2 and 4.0 k Hz, the sound pressure increased by 0.038、0.118、0.318、1.478、1.088 Pa(equal to 0.5、1.5、3.5、10.5、8.7 d B), respectively. CONCLUSION The study based on the FEM shows there is an obvious frequency-dependant SPG on the TM. Further experimental study using temporal bone is necessary.
出处
《中国耳鼻咽喉头颈外科》
CSCD
2015年第6期273-274,共2页
Chinese Archives of Otolaryngology-Head and Neck Surgery
基金
北京市自然科学基金资助项目(7142040)
关键词
耳道
鼓膜
有限元分析
力学
声压增益
Ear Canal
Tympanic Membrane
Finite Element Analysis
Mechanics
sound press gain
