發(fā)布時(shí)間：2018-08-12 15:36

【摘要】：一般而言鼓膜兩邊的氣壓剛好平衡，但因?yàn)橐恍┨厥庠蚴构哪蛇叺臍鈮翰黄胶鈺r(shí)，，鼓膜則受到一個(gè)靜壓力的作用，此時(shí)中耳的傳聲則就會(huì)發(fā)生顯著改變。本文是利用有限元的方法研究耳道靜壓對(duì)中耳聲音傳遞的影響，主要做了如下研究： 首先，根據(jù)無(wú)聽(tīng)力損傷病史的顳骨螺旋CT掃描影像數(shù)據(jù)集，通過(guò)圖象處理軟件和CAD軟件，獲得中耳幾何模型，并通過(guò)有限元前處理軟件Hypermesh進(jìn)行網(wǎng)格劃分，獲得中耳的三維有限元模型，并根據(jù)國(guó)內(nèi)外的研究成果反復(fù)驗(yàn)證和修正有限元模型。 在得到比較完善有限元模型的基礎(chǔ)上，根據(jù)相關(guān)文獻(xiàn)關(guān)于不同壓力下中耳響應(yīng)實(shí)驗(yàn)數(shù)據(jù)并結(jié)合有限元計(jì)算，用試算法擬合出了中耳各構(gòu)件的等效彈性模量與耳道靜壓力的關(guān)系的經(jīng)驗(yàn)公式。然后，通過(guò)改變中耳各軟組織的材料參數(shù)模擬了耳道靜壓對(duì)中耳機(jī)動(dòng)性的影響，得出了不同耳道壓力下鐙骨底板和鼓膜臍部的速度、位移的變化，以及不同壓力下耳蝸兩窗壓力差的變化。 本文的結(jié)果表明：耳道正壓對(duì)中耳聲音傳遞的影響稍大于正壓，在低頻范圍外耳道靜壓對(duì)兩窗壓力差的影響稍大于對(duì)鐙骨位移的影響。本文的研究為中耳鼓室圖的建立提供基礎(chǔ)。
[Abstract]:Generally speaking, the air pressure on both sides of the tympanic membrane is just balanced, but when the pressure on the two sides of the tympanic membrane is unbalanced for some special reasons, the tympanic membrane is subjected to a static pressure, and the sound transmission of the middle ear will change significantly. In this paper, we use finite element method to study the effect of auditory canal static pressure on middle ear sound transmission. Firstly, according to the temporal bone spiral CT scan data set without history of hearing impairment, we do the following research. Through image processing software and CAD software, the middle ear geometry model is obtained, and the three-dimensional finite element model of middle ear is obtained by Hypermesh, a finite element pre-processing software. According to the domestic and foreign research results, the finite element model is repeatedly verified and modified. On the basis of getting the perfect finite element model, according to the experimental data of the middle ear response under different pressure and combining with the finite element calculation, The empirical formula of the relationship between the equivalent elastic modulus of each component of the middle ear and the static pressure of the ear canal is fitted by the trial algorithm. Then, by changing the material parameters of the soft tissues of the middle ear, the influence of the static pressure of the ear canal on the mobility of the middle ear is simulated, and the changes of the velocity and displacement of the stapes floor and the umbilical cord of the tympanic membrane under different ear canal pressures are obtained. And the change of cochlear pressure difference between two windows under different pressure. The results show that the influence of positive pressure of ear canal on the sound transmission of middle ear is slightly greater than that of positive pressure, and the influence of static pressure of external auditory canal on the pressure difference between two windows is slightly greater than that on stapes displacement in low frequency range. This study provides a basis for the establishment of tympanogram of the middle ear.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TH785.1;R764

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 劉迎曦;李生;孫秀珍;;人耳傳聲數(shù)值模型[J];力學(xué)學(xué)報(bào);2008年01期

2 劉后廣;塔娜;饒柱石;;懸浮振子對(duì)中耳聲傳播特性影響的數(shù)值研究[J];力學(xué)學(xué)報(bào);2010年01期

3 姚文娟;李武;付黎杰;黃新生;;中耳結(jié)構(gòu)數(shù)值模擬及傳導(dǎo)振動(dòng)分析[J];系統(tǒng)仿真學(xué)報(bào);2009年03期

4 王振龍;王學(xué)林;胡于進(jìn);師洪;程華茂;;基于中耳與耳蝸集成有限元模型的耳聲傳遞模擬[J];中國(guó)生物醫(yī)學(xué)工程學(xué)報(bào);2011年01期

本文編號(hào)：2179498