研究生: |
劉翠鵑 |
---|---|
論文名稱: |
以徑向振動波模式探討軸向張力對徑向振動傳輸功率之影響 |
指導教授: | 王林玉英 |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 48 |
中文關鍵詞: | 徑向振動理論 、彈性模數 、環向彈性位能 、軸向動能 、主動脈弓 |
論文種類: | 學術論文 |
相關次數: | 點閱:135 下載:1 |
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本研究以「徑向共振理論」的理論模式為基礎,利用Latex管模擬實驗瞭解軸向張力對管子的彈性模數Ep,管內壓力波波速V,以及環向彈性位能Pc的影響。並用Latex管與氣球模擬主動脈弓構造,探討轉彎對壓力波振幅造成的影響。
實驗以電磁鐵台輸出脈衝波和週期波模擬心臟輸出,Latex管模擬主動脈以及將管彎曲模擬主動脈弓,利用水槽提供系統靜壓模擬動脈系統中的舒張壓,拉長管子模擬生理上的軸向伸長。波源輸入後,由壓力轉換器量測管內壓力隨時間變化,並由傅力葉分析轉換成頻譜圖。
實驗證明軸向張力使得彈性模數Ep變小,波速也有減小趨勢。且當軸向張力逐漸增加,環向彈性位能Pc並非逐漸增加或減少,而是有一峰值出現。此外由彎管實驗,也證明不論是脈衝波或週期波輸入,轉彎的確能使壓力波振幅增加。
不管是藉軸向張力改變血管彈性或使血管彎曲,所得結果與傳統流量理論不符,但符合共振理論,更加深了共振理論的合理性。
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