Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1593
標題: 線上第二路徑鑑別的方法應用於主動噪音控制系統
An Online Secondary Path Modeling Method for Active Nosie Control System
作者: 陳冠宏
Chen, Guan-Hong
關鍵字: active noise nontrol;主動噪音控制;online secondary path modeling;線上第二路徑鑑別
出版社: 機械工程學系所
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摘要: 
在主動噪音控制系統中,由於FxLMS演算法較簡單因此被廣泛使用,然而FxLMS演算法需應用第二路徑轉移函數,而第二路徑轉移函數需以離線鑑別的方式獲得,若第二路徑轉移函數為時變即使以離線方法鑑別出來仍會失真,因此需要線上鑑別的方法。本文提出一個新的線上第二路徑鑑別的方法於主動噪音控制中,於鑑別的過程中使用補償器以提供一補償訊號並用於主動噪音控制,。為了提升主動噪音控制系統的收斂速度與降噪程度,本文應用指數遞減型步階演算法。電腦模擬中與既有的方法進行比較得知本文方法有較好的性能,而實驗的結果驗證電腦模擬的有效性與在實際的主動噪音控制應用的可行性。

In active noise control (ANC) systems, the FxLMS algorithm is widely used due to its simplicity. However, a secondary- path transfer function is required in the FxLMS algorithm. The secondary- path transfer function is generally obtained from an off-line identification method. If the secondary path is time varying, the identified transfer function may lose its accuracy and an online secondary-path modeling technique can thus be needed. This study proposes a new online secondary-path modeling method for ANC where a compensator is utilized to provide signals for compensation in the secondary-path identification and in ANC. In order to enhance speed of convergence rate and level of noise reduction in ANC system, this study also uses exponential-decay step size. Computer simulation shows that the proposed method has better ANC performance as compared to that of existing methods. Experimental results validate the effectiveness of the proposed method as in computer simulations and support its feasibility in real ANC applications.
URI: http://hdl.handle.net/11455/1593
其他識別: U0005-1908201112071700
Appears in Collections:機械工程學系所

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