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  • 會議論文

應用頻率域Filtered-X LMS演算法於管道噪音主動控制研究

摘要


本文主要是針對管道低頻噪音,進行適應性主動式噪音控制的研究。我們根據適應性控制理論提出頻率域之Filtered-X LMS演算法,以解決傳統時間域適應性控制方法無法有效降低寬頻噪音的問題。頻率域Filtered-X LMS演算法則是針對各個頻帶噪音,在頻率域進行控制參數的修正與更新,以降低數學模型輸出訊號與要求輸出訊號之間的誤差,而控制的進行則需要考慮即時性,故仍然是在時間域進行運算處理。此種演算法設計可以快速達到穩定收斂,提高控制的效能。我們並且運用LabVIEW圖控程式來進行演算法的實現,以評估本文所提之頻率域Filtered-X LMS演算法之性能。實驗結果顯示,此種控制方法在抑制低頻的管道噪音上有顯著之控制效果。 。

並列摘要


This project is a research of adaptively active noise control in a duct. The purpose of this research is to develop a frequency domain Filtered-X LMS algorithm in order to solve the problem of conventional time domain adaptive control method which cannot reduce noise efficiently in broadband. In the frequency domain Filtered-X LMS algorithm, the updating of control parameter is executed through each band in frequency domain, while the control process is carried out in time domain to reflect real-time characteristics. This algorithm suits to broad band active noise control and can rapidly reach steady convergence and increase the control performance. In this study, we use LabVIEW programming language to carry out the algorithm. The results showed that the proposed method can effectively reduce low frequency noise in a duct.

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