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- Actuator Placement and Zero Effect on Global Wide-band Noise Reduction in Ducts with Hybrid System Identification Technique
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題 名 | Actuator Placement and Zero Effect on Global Wide-band Noise Reduction in Ducts with Hybrid System Identification Technique=利用混合式系統辨認技術來探討致動器擺置與零點效應對聲管降低噪音之影響以獲得全域寬頻的效果 |
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作 者 | 林忠逸; 余玉田; | 書刊名 | 中國工程學刊 |
卷 期 | 24:5 2001.09[民90.09] |
頁 次 | 頁549-558 |
分類號 | 334.253 |
關鍵詞 | 聲管模式; 主動噪音控制; 全域寬頻; 混合式系統辨認技術; Acoustic duct model; Active noise control; Global wide band; Hybrid system identification; |
語 文 | 英文(English) |
中文摘要 | 本研究利用混合式系統辨認技術來為一物理聲管系統建立數學模式,此數學模式 包含一維理論聲管的實數狀態空間方程式及兩個轉移函數,此兩個轉移函數是用來描述相關 致動系統的動態特性。利用所建立的數學模式,我們探討前饋控制輸入點與性能設計點之相 對位置,以消除系統具微小阻泥之零點,使能獲致寬頻的主動噪音控制性能。對具固定頻率 的噪音,電腦模擬顯示在 50 ﹣ 350 Hz 中有 20 dB 以上的消音性能; 相對的實驗則顯示 在 60 ﹣ 345 Hz 之中有 5 ﹣ 17 ﹣ dB 的消音性能,實驗也顯示在接近頻域的兩端( 50 和 350 Hz )有較少的消音性能,此可能導致於作系統辨認時所用的有限頻寬之故。此外實 驗數據也顯示對控制頻寬內的噪音有全域的消音性能。另外對具 50 ﹣ 350 Hz 的有色噪音 ,實驗結果也顯示有效的消音性能。整體而言,電腦模擬與實驗的結果表現出全域寬頻的消 音性能。 |
英文摘要 | To achieve global wide-band noise reduction in a physical acoustic duct, actuating dynamics of the duct were described as two black-box transfer functions obtained by a hybrid system identification technique. The derived actuating dynamics were then incorporated into a real-state-space acoustic duct model for active noise control (ANC). The relative dispositions of two sites, the secondary source and the performance point, along the duct were also investigated to eliminate the effect of lightly damped zeros seen in feed-forward ANC design. A better performance was obtained when the two sites were far apart and the secondary source was near to the primary noise source. Computer simulation analysis revealed noise reduction of 20 dB or more for periodic disturbance at a fixed frequency within 50-350 Hz, whereas there was 5-17-dB noise reduction for that within 60-345 Hz in the real experiments. Less noise reduction near both ends of the frequency range (50 and 350 Hz) in experiments might result from the limited frequency range used for the system identification. Global noise reduction was also obtained for disturbances at various frequencies in experiments. In addition, there was effective noise reduction for bandlimited white noise within 50-350 Hz. Taken together, computer simulation and experimental results demonstrate a global wide-band noise reduction performance. |
本系統中英文摘要資訊取自各篇刊載內容。