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頁籤選單縮合
題名 | 室內單頻噪音主動控制=Active Noise Control of a Pure-Tone Field in an Enclosure |
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作者姓名(中文) | 劉德源; 洪宏基; | 書刊名 | 中國造船暨輪機工程學刊 |
卷期 | 17:2 1998.05[民87.05] |
頁次 | 頁1-15 |
分類號 | 445.6 |
關鍵詞 | 脈衝響應; 映像法; 有限脈衝響應; 無限脈衝響應; 自適應控制; Impulse response; Image method; Finite impulse response; Infinite impulse response; Adaptive control; |
語文 | 中文(Chinese) |
中文摘要 | 本文旨在結合聲學計算與實驗驗證技術,進行長方體聲場時間域之即時噪音主動 控制。基於利用聲場特性做即時控制,因此特別著重脈衝響應的計算與實測。為了計算三維 室內聲場的脈衝響應,本文發展出脈衝點聲源的頻帶和表示法,做為三維時間域聲壓場的輸 入脈衝,聲場之場域為剛性邊牆之長方體,以映像法可求得到脈衝響應的歷時序列。本研究 建造 -750mm*945mm*1190mm 的長方體透明壓克力模型,做為聲場之主動控制實驗用。 進行 脈衝點聲源、脈衝響應、有限脈衝響應 (FIR) 控制、無限脈衝響應 (IIR) 控制的實驗工作 。兩種控制模式均採用歸一化最小均方 (NLMS) 自適應控制法則。對於單頻點聲源引致的長 方體聲場,進行單點控制的效果相當分歧,最佳者為 400Hz 案例,下降 27.7dB,少數頻率 無法控制,一般在 9dB 至 17dB 之間。以 FIR 控制效果較佳。 |
英文摘要 | This paper develops an acoustic computation theory and experimental verification techniques for active noise control in a rectangular enclosure. A greater emphasis is put on taking advantage of the characteristics of the sound field in the control algorithms. A method of band summation is proposed to simulate an impulse at a point. A band summation so simmulated is then used as an input to the sound pressure wave equation for calculating directly in time domain the impulse response. The subsequent part of the response is calculated in the rigid rectangular room by the image method. A rectangular model of 750mm*945mm*1190mm made of six transparent acrylic plates 20 mm thick was constructed for experimental verification. The experiments included the simulation of the impulse signal, measurement of the impulse response, active noise control by a finite impulse response (FIR) model and by an infinite impulse response (IIR) model. Both the two control models used adaptive algorithms of normalized least mean square (NLMS). The control performance for pure-tone noise at a chosen point showed very much diversity. The best con thus far achieved was a reduction of 27.7 dB at 400 Hz, while the average attenuation gained was between 9 dB and 17 dB. Neverthless, there were also cases at some specific frequencies where no reductions were obtained. The performance of the FIR model was found better and more stable than that of the IIR model. |
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