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研究生:李威憲
研究生(外文):Wei-Hsien Li
論文名稱:變阻尼機構之結構設計與參數最佳化
論文名稱(外文):Structural Design and Parametric Optimization of Damping Variable Mechanisms
指導教授:蕭肇殷
指導教授(外文):Chao-Yin Hsiao
學位類別:碩士
校院名稱:逢甲大學
系所名稱:機械工程學所
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:2005
畢業學年度:93
語文別:中文
論文頁數:66
中文關鍵詞:邊界層理論變阻尼機構基因演算法
外文關鍵詞:damping variable mechanismboundary layer theoryGenetic algorithms
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本文提出一種變阻尼機構之設計方法。首先對二階避震器,以輸出振幅的暫態及穩態誤差為適應函數,應用基因演算法進行變阻尼的參數最佳化,規劃避震器在不同位移時阻尼比的最佳值。再配合流體力學中的邊界層理論設計出變阻尼機構,使它可以藉由改變阻尼孔口截面積的大小,達到變阻尼的目標。為了進一步了解系統的特性,使用電腦模擬分析系統的動態特性,並由不同的案例模擬、觀察及比較與傳統避震器的差異。
In this thesis, a method for designing damping variable mechanism is proposed. At first, we adopt both the transient error and the steady-state error of the displacement variations of the piston of a 2nd order shock absorber as the fitness function, and design a genetic algorithms to determine the optimal damping values for the piston at different positions. Then, basing on the boundary layer theory of viscous fluid flow, we determine the cross section areas of the gape of the damping variable mechanism at different positions. For understanding the characteristics of the system further, we conduct computer simulations for observations and for comparing the differences in characteristics between the damping variable mechanism and a convention in characteristics shock absorber.
致 謝 I
摘要 II
英文摘要 III
目錄 IV
圖目錄 VII
表目錄 IX
第一章 緒論與文獻回顧 1
1.1 前言 1
1.2 文獻回顧 2
1.3 研究動機 6
1.4 章節概要 8
第二章 理論基礎 9
2.1 基因演算法 9
2.1.1 資料結構 9
2.1.2 編碼與解碼 10
2.1.3 初始化族群 12
2.1.4 適應函數 12
2.1.5 複製 14
2.1.6 交配 16
2.1.7 突變 18
2.1.8 菁英政策 20
2.2 抑振相關原理及技術 20
2.3 系統轉移函數的求解 22
2.4 敍述函數 24
2.5 截面積與阻尼值關係之探討 26
第三章 機構設計與動態方程式推導 29
3.1 方程式推導 29
3.2 機構設計 39
第四章 電腦模擬 42
4.1 參數設定 43
4.2 動態分析及效能比較 44
第五章 討論與結論 51
5.1 討論 51
5.2 結論 53
參考文獻 54
附錄A 在學期間發表的論文 57
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