【摘要】：有限元分析是模擬聲音在人耳內(nèi)傳遞的有效方法,通過聲場——結(jié)構(gòu)耦合有限元模型計算可模擬中耳結(jié)構(gòu)變化對耳聲傳遞的影響。 本文建立了包括耳道和耳腔內(nèi)的空氣、中耳結(jié)構(gòu)、簡化直腔耳蝸及淋巴液集成的有限元模型。通過聲場——結(jié)構(gòu)耦合分析計算聲音由外耳道向內(nèi)耳的傳遞過程,獲得了鼓膜、鐙骨足板的位移、中耳的聲壓增益、前庭階的壓力分布及前庭階與鼓階的壓力差,模擬了基底膜自蝸底到蝸頂?shù)念l率選擇特性。 在聲場正向傳遞分析的基礎(chǔ)上,通過建立的簡化直腔耳蝸模型,分析圓窗激勵條件下的聲音由圓窗經(jīng)過鼓階、前庭階傳遞至卵圓窗并到達中耳的逆向傳遞過程,獲得了耳聲逆向傳遞下的耳蝸壓力分布、鼓階與前庭階壓力差分布。 最后,本文建立了中耳與中耳植入輔助聽力裝置的有限元模型,計算了助聽裝置植入中耳前后的鼓膜和鐙骨足板的位移響應(yīng),分析了不同安裝條件下植入式助聽質(zhì)量對中耳聲傳遞功能的影響。 中耳與耳蝸集成模型計算獲得的鼓膜及鐙骨位移響應(yīng)、中耳壓力增益、圓窗處的壓力增益和聲音逆向傳遞條件下壓力差分布等結(jié)果與相關(guān)實驗數(shù)據(jù)較一致,說明了本文建立的中耳模型、耳蝸模型和基底膜力學參數(shù)的合理性。因此,本文建立的中耳與簡化耳蝸集成模型可進一步應(yīng)用于不同條件下中耳功能和耳蝸運動功能的數(shù)值模擬。
[Abstract]:Finite element analysis (FEM) is an effective method to simulate the sound transmission in human ear. The effect of the change of middle ear structure on the acoustic transmission can be simulated by using the coupled finite element model of sound field and structure. In this paper, a finite element model of air, middle ear structure, simplified cochlea and lymphatic fluid in ear canal and ear cavity is established. The sound transfer process from the external auditory canal to the inner ear was calculated by sound field-structure coupling analysis. The displacement of the tympanic membrane, stapes foot plate, the sound pressure gain of the middle ear, the pressure distribution of the vestibular step and the pressure difference between the vestibular and tympanic steps were obtained. The frequency selection characteristics of the basement membrane from the cochlea base to the cochlea apex were simulated. On the basis of forward transmission analysis of sound field, a simplified straight cavity cochlear model is established to analyze the reverse transmission process of sound from round window to oval window and to middle ear under circular window excitation condition, in which the sound passes through the drum step, the vestibular step passes to the oval window, and the sound is transferred to the middle ear. The cochlear pressure distribution and the pressure difference between the tympanic and vestibular steps were obtained. Finally, the finite element model of middle ear and middle ear implants is established, and the displacement responses of tympanic membrane and stapes footplate before and after middle ear implantation are calculated. The effect of implantable hearing aid quality on middle ear sound transmission was analyzed under different installation conditions. The results of tympanic membrane and stapes displacement response, middle ear pressure gain, pressure gain at the round window and pressure difference distribution under the condition of sound reverse transmission obtained by the integrated model of middle ear and cochlea were in good agreement with the experimental data. The rationality of the middle ear model, cochlea model and the mechanical parameters of the basement membrane were demonstrated. Therefore, the integrated model of middle ear and simplified cochlea can be further applied to the numerical simulation of middle ear function and cochlear motor function under different conditions.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：Q62;R764

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