火箭發射噪音之主動式控制

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林永常(Y-C Lin ) 查詢紙本館藏

畢業系所

機械工程研究所

論文名稱

火箭發射噪音之主動式控制

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摘要(中)

本論文以主動式噪音控制(Active Noise Control , ANC)來減低火箭發射瞬間於駕駛室(操控室)所造成的噪音。首先，針對火箭發射時所錄製的兩組噪音信號進行時頻分析，藉此充份瞭解火箭發射噪音的特性；為方便噪音控制演算法之發展及效果評估，製作一全比例尺寸之壓克力駕駛室模型，模擬實際音場；實驗時，假設駕駛者位置是固定的，於駕駛室模型內正前方放置一個喇叭模擬噪音源，而於駕駛者頭部後方位置放置一個喇叭產生反相噪音，抵消噪音源。控制目標為降低駕駛者耳部附近噪音。研究中採用以「適應性濾波理論」為基礎之演算法─FXLMS及LMS-ANC，作為ANC控制方法。本論文分別以實驗的方式比較FXLMS及LMS-ANC對火箭發射噪音之消音效果並驗證利用主動噪音控制消除火箭發射噪音的可行性。

關鍵字(中)

★ 主動式噪音控制
★ 火箭發射噪音
★ 適應性濾波器

關鍵字(英)

★ Actuve Noise Control
★ Analysis of Noise Character

論文目次

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

參考文獻

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指導教授

潘敏俊(Min-Chun Pan)

審核日期

2001-7-5

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