光電式耳膜附著助聽器之動態行為研究

The Dynamic Behavior of the Opto-electromagnetic Actuator Coupled to the Tympanic Membrane

黃千才(Chien-Tsai Huang)

指導教授 ： 周元昉

國立臺灣大學/工學院/機械工程學研究所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.00831

摘要

在現代的醫療環境下，耳朵失聰或是重聽的疾病往往還是無法根治的，患者只能仰賴助聽器來改善聽力的狀況。而耳膜附著式助聽器之設計除了可以改善聽力之外，還改進了一些傳統助聽器的缺點，如耳道的閉塞感或是聲音失真的問題。本文研究改良已經研發成功之光電式耳膜附著助聽器，期望能使其效率及質量都能再提高。
本文設計第二代新式耳膜附著式助聽器之致動器及其組裝流程，製作完後的成品總質量只有35mg，比起前一代的致動器減少了47%之質量。在製作完成後也對此致動器進行振態以及固有頻率的測試，由頻率響應函數的圖形，估算出致動器中PET薄膜的等效彈性係數以及其阻尼比。
在得到PET薄膜之性質後，便參考一些文獻，假設耳膜之等效彈性係數以及阻尼比。建立兩個自由度的模型，預測致動器實際裝置在耳膜上時頻率響應的情形。

關鍵字

助聽器 ； 動態行為 ； 光電式 ； 模態 ； 頻率響應函數 ； 耳膜

並列摘要

In the modern medical environment, deaf or hard of hearing still haven’t found a way to cure completely. Patients can only rely on hearing aids in order to improve hearing. The design of the opto-electromagnetic actuator coupled to the tympanic membrane not only can improve hearing but also reform some defects of conventional hearing aids like the occlusion of ear canal or distortion of sound.
This study refined the opto-electromagnetic actuator coupled to the tympanic membrane which has already successfully developed, hoping to increase its efficiency and lower its quality. The standard operating procedure of the 2nd generation actuator been developed. The 2nd generation actuator has lessen 47% of its quality compare to the previous generation, and the total quality is only 33mg.
After the production we tested the mode shape and the natural frequency of the actuator. From the diagram of frequency response function, the equivalent elasticity and the damping ratio of the PET film on the actuator can be acquired. We searched for references after obtaining the property of the PET film, therefore the property of the ear drum can assumed. Using the above data to establish a model of two degree of freedoms and predict the frequency response function of the actuator when it coupled with the ear drum.

並列關鍵字

hearing aid ； dynamic behavior ； opto-electromagnetic ； mode shape ； frequency response function ； tympanic membrane

參考文獻

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