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研究生:王家文
研究生(外文):Wang jia wen
論文名稱:形狀記憶合金應用於圓桿波傳的阻抗控制數值模擬
論文名稱(外文):Impedance Control of Wave Transmission in the Cylindrical Rod Using Shape Memory Alloy:Numerical Simulation
指導教授:羅正忠羅正忠引用關係
學位類別:碩士
校院名稱:大葉大學
系所名稱:機械與自動化工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:87
中文關鍵詞:波傳阻抗不匹配減振形狀記憶合金
外文關鍵詞:wave propagationimpedance mismatchvibration reductionshape memory alloys
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形狀記憶合金(shape memory alloy,簡稱SMA)具有高剛性和良好的阻尼值,其阻抗特性和楊氏係數相關。簡單來說,形狀記憶合金可感測外界溫度的變化而自我改變楊氏係數,這種獨特的可調諧性(tunable),則是其他金屬所沒有的,因此形狀記憶合金元件可以視為一個穿透能帶(pass-band)的濾波器,經由謹慎的設計後,只允許特定頻寬的振動能量波通過而阻絕掉不要的振動能量,達到阻抗控制、振幅抑制、振能吸收與振動局部化的目的。
在此所使用的分析軟體則為ANSYS內的WORKBENCH,模擬Ni-Ti形狀記憶合金作為波傳阻抗控制的嵌入物,使其與結構產生阻抗不匹配的效果,進而探討圓桿結構之縱向與橫向的振動能,並以三種模擬條件探討形狀記憶合金嵌入物,對於結構內抑制振動能量波的情況:(a)嵌入物楊氏係數的變化;(b)嵌入物長度的變化和(c) 嵌入物位置及分佈情況的變化。
由初步的結果顯示,低頻率的振動較難抑制(橫向第一模態);高頻率的振動則可有效率的抑制(橫向第二、第三模態與縱向第一模態)。
Shape memory alloy(SMA) with high stiffness and fine damping, the impedance characteristics and the Young's Modulus of correlation. In short, SMA can sense external temperature and self-change Young's Modulus, this unique tunable is short of the other metals. Therefore, SMA components can be as a filter of pass-band, through careful design, it only allows a specific vibration energy wave of bandwidth through and block off the other, achieve impedance control, amplitude suppression, vibration absorption and vibration localized purposes.
Using ANSYS WORKBENCH simulated Ni-Ti SMA insert to control wave propagation and impedance, let to produce the effect of impedance mismatch with structure, and then consider the transverse and longitudinal vibration energy of the cylindrical rod, and in three simulated conditions of SMA insert to consider the structure suppress the vibration energy wave conditions: (a) changes of insert Young's Modulus; (b) change of insert length and (c) changes of insert location and distribution.
By the preliminary results show that low frequency vibration difficult to suppression(transverse first mode);high frequency vibration can efficiently suppression (transverse second、third modes and longitudinal first mode).
封面內頁
簽名頁
授權書...........iii
中文摘要.........iv
英文摘要.........v
誌謝.............vi
目錄.............vii
圖目錄...........x
表目錄...........xiii
符號說明.........xiv

第一章 緒論....1
1.1 研究背景.1
1.2 研究目的.1
1.3 波傳性質.3
1.4 形狀記憶合金......4
1.4.1 形狀記憶效應.......7
1.4.2 超彈性....10
1.4.3 阻尼特性..12
1.4.4 形狀記憶合金的應用.14
1.4.4.1 航太工業的應用...14
1.4.4.2 機械電子產品的應用.......15
1.4.4.3 汽車工業的應用...16
1.4.4.4 生物醫療的應用...16
1.4.4.5 日常生活的應用...19
1.4.4.6 其他方面的應用...20
1.5 文獻回顧.21
1.5.1 結構振動與動態穩定性......21
1.5.2 波傳控制..22
1.5.3 被動式控制.23
1.5.4 主動式控制.25
1.6 本文架構.26
第二章 懸臂圓桿的動態分析.27
2.1 ANSYS建立懸臂圓桿之有限元素模型....27
2.2 懸臂樑的縱向振動..33
2.3 懸臂樑的橫向振動..39
第三章 波傳和阻抗匹配理論.50
3.1 波傳性質.50
3.2 縱向波...53
3.3 橫向波...57
3.4 阻抗匹配.61
第四章 振動能量波的抑制成效探討...64
4.1 波的傳遞及反射....64
4.2 縱向振動能量波抑制探討.....68
4.3 橫向振動能量波抑制探討.....71
4.4 結論....80
第五章 結論與未來工作...81
5.1 目前研究結果......81
5.2 未來工作.82
參考文獻.........83
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