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研究生： 林永常
Y-C Lin
論文名稱： 火箭發射噪音之主動式控制
指導教授： 潘敏俊
Min-Chun Pan
口試委員:
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
畢業學年度： 89
語文別： 中文
論文頁數： 69
中文關鍵詞： 火箭發射噪音 、主動式噪音控制 、適應性濾波器
外文關鍵詞： Actuve Noise Control, Analysis of Noise Character
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    • 第一章 緒論 1 1.1 研究動機…………………………………………………………1 1.2 相關文獻回顧……………………………………………………2 1.3 主動式噪音消除之基本原理……………………………………3 1.3.1 Young’s principle………………………………………3 1.3.2 Huygen’s principle ……………………………………4 1.3.3 偶極子結構…………………………………………………5 1.3.4 模態控制原理………………………………………………5 1.3.5 自適應性控制基礎理論……………………………………6 1.4 論文架構…………………………………………………………8 第二章 火箭發射噪音特性分析 9 2.1 火箭發射噪音之聲壓時間序列…………………………………9 2.2 火箭噪音之頻譜分析……………………………………………12 2.3 結論………………………………………………………………16 第三章 主動消音控制器之設計 17 3.1 ANC控制結構 ……………………………………………………18 3.1.1 回饋結構……………………………………………………18 3.1.2 前饋結構……………………………………………………20 3.1.3 複合結構……………………………………………………22 3.2 多通道FXLMS演算法 ……………………………………………23 3.3 多通道LMS_ANC演算法 …………………………………………29 第四章 硬體系統架構與實驗設計 33 4.1 駕駛室三維噪音系統……………………………………………33 4.1.1 駕駛室模型…………………………………………………33 4.1.2 喇叭…………………………………………………………35 4.2 訊號處理系統……………………………………………………36 4.2.1 麥克風………………………………………………………36 4.2.2 前級放大器…………………………………………………37 4.2.3 A/D、D/A卡…………………………………………………37 4.2.4 DSP母卡 ……………………………………………………37 4.2.5 後級放大器…………………………………………………38 4.3 實驗設計…………………………………………………………38 4.3.1 第二路徑之系統鑑別………………………………………39 4.3.2 主動消音實驗設計…………………………………………41 第五章 實驗結果及分析 44 5.1 第二路徑系統鑑別………………………………………………44 5.2 多通道FXLMS噪音消除 …………………………………………51 5.2.1 單頻噪音消音………………………………………………51 5.2.2 穩態隨機噪音消音…………………………………………54 5.2.3 火箭發射噪音消音…………………………………………56 5.3 多通道ANC_LMS噪音消除 58 5.3.1 單頻噪音消音………………………………………………58 5.3.2 穩態隨機噪音消音…………………………………………61 5.3.3 火箭發射噪音消音…………………………………………63 5.4 FXLMS與ANC_LMS之比較…………………………………………65 第六章 結論與未來展望 66 參考文獻 67

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