| 研究生: |
謝秉原 Hsieh, Bing-Yuan |
|---|---|
| 論文名稱: |
有限元素法模擬牙科手機之減噪設計 Noise Reduction Design for Dental Handpiece Based on Finite Elements Simulation |
| 指導教授: |
黃才烱
Huang, Tsai-Jeon |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 論文出版年: | 2019 |
| 畢業學年度: | 107 |
| 語文別: | 中文 |
| 論文頁數: | 85 |
| 中文關鍵詞: | 牙科手機 、減噪 、結構噪音 、氣動噪音 |
| 外文關鍵詞: | Dental handpiece, Noise reduction, Structure-borne noise, Aerodynamic acoustic |
| 相關次數: | 點閱:51 下載:6 |
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牙科手機是牙醫師治療病患不可或缺之手持器械,隨著醫療水準提升及人民對於口腔美觀及衛生習慣養成,使得就診牙醫人數逐年上升,這也促使牙材市場規模逐漸擴大,牙材器具不停持續發展和進步,給予病患最舒適治療及更有安全性,然而每天應付大量看診病患,牙醫師長期使用牙科手機,其高頻振動,不但影響其手部活動,而若不善保養工具,伴隨而來刺耳噪音問題,不僅使牙醫師精神無法集中,且對於病患心理造成恐懼。在臨床治療下,牙科手機產生噪音,牙醫師ㄧ般都默默忍受,但長期暴露此環境下容易罹患職業病,且刺耳的聲音也容易使人心理焦慮。
本研究先對牙科手機模型建立,根據不同研究情況做簡化,分成結構模型及分析流場模型,為了能得知病患在治療時,其耳部感受,故再建立簡化病患人頭模型,以模擬實際治療情況;為了能得知牙科手機運轉時內部流場情況,在其內部建立渦輪流域,來模擬牙科手機轉子旋轉情形。
本研究針對高速牙科手機做模擬分析,分別建立牙科手機有限元素模型,為了探討如何減少牙科手機結構噪音及氣動噪音,所以各別設計減噪方法進行模擬。結構噪音部分,藉由改變手持固定位置及搭配減振設計,探討在病患耳部之響應,得知不同頻率分析下之降噪效果;氣動噪音部份,藉由改良進氣導管之構造及不同內徑和輸入氣壓,探討牙科手機內部流場造成之噪音,比較原始設計下同輸入氣壓之降噪程度。本研究發現氣動噪音為牙科手機主要來源,透過對進氣導管改良設計,可有效減少牙科手機噪音污染。
Dental handpieces are indispensable tools for the dentist to treat patients. With the consciousness of oral beauty and personal hygiene, dental clinics have been integrated into our lives. It’s very common that people visit the dentist regularly. Therefore, the dental market increases year by year, leading to continuous development and progress of dental equipment in order to give patients more comfortable treatment. However, dentists work a long time to use dental handpiece. There is a big issue about the vibration and noise problems during the operation, it not only affects dentist’s hand activities in high-frequency vibration but also makes noise to make patients feel anxious and fearful.
To find out the noise source of dental handpiece , this study focuses on simulating the operation of dental handpiece and establishes the finite element model based on the different situation such as structure-borne noise and aerodynamic acoustic. Finally, this study explores how to reduce the noise of dental handpiece between structure-borne noise and aerodynamic acoustic. There are few methods designed to solve these problems. Compared original result with the designed result, and it shows different hand-held positions produce different sound pressure level, through holding to the end to relieve noise. Aerodynamic acoustic is the main source of dental handpiece, improving air intake design can effectively reduce the noise pollution of dental handpiece.
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