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題 名 | The Influence of Error-Path Compensation on the Adaptively Active Control of the Acoustic Radiation from a Vibrating Plate=誤差路徑補償對振動平板聲輻射適應性主動控制之影響 |
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作 者 | 陳國在; 蔡伯謙; 黃思銘; | 書刊名 | 國立臺灣大學工程學刊 |
卷 期 | 86 2002.10[民91.10] |
頁 次 | 頁23-31 |
專 輯 | 「工科海洋」專輯 |
分類號 | 334.7 |
關鍵詞 | 誤差路徑補償; 聲音輻射; 適應性主動控制; Error-path compensation; Acoustic radiation; Adaptively active control; |
語 文 | 英文(English) |
中文摘要 | 於甚多聲學之相關適應性主動控制問題中,為簡化控制程序演算式(algorithm)之複雜性,往往將聲學元件如訊號放大器等所涉及回饋路徑(feedback path)之轉移函數(transfer function)假設為一固定增益,此將致使回饋訊號存在相位延遲(phase delay),因而造成控制效果不佳亦控制程序發散。本文主要以實驗研究,針對振動平板之聲幅射進行適應性振動主動控制時,有無考慮聲學元件所對應之誤差路徑補償(error-path compensation),其聲幅射衰減差異。因此本研究包括平板前三階共振頻率預估,控制系統適應性演算式推演,以及振動平板之相關適應性主動控制實驗。研究結果顯示,當誤差路徑補償被考慮時,振動平板之聲蝠射衰減於前三個共振頻率及較高之三個非共振頻率(132, 178, 240, 350, 400, 500Hz),相較於無考慮時,均維持3至4分貝之增量。上述之增量對頻率之改變,並無明顯之變化趨勢。 |
英文摘要 | To simplify the algorithm of an adaptive control system in acoustics, the transfer functions dealing with all the instruments involved, such as the amplifier for enlarging acoustic signal, etc., is always assumed to be a constant gain. The above situation likely produces a phase delay of the feedback signal in a closed system, and then leads a worse control effectiveness. This study is mainly to discuss in experiment the influence of error-path compensation on the adaptively active control of acoustic radiation from a vibrating plate. Therefore, the determination of the first three resonant frequencies of the plate, which have dominant dynamical response, the derivation of the adaptive algorithm involved in the control system, and the adaptive active control experiments for both with and without error-path compensation are included. The result of study reveals almost the same increment by 3~4dB on the reduction of the acoustic power radiation at all frequencies involved from a vibrating plate is achieved when an error-path compensation is taken into consideration in the algorithm of the adaptive control system adopted. The result as mentioned also shows no dominant dependence of the above increment on the frequencies ranging form 132 through 500Hz. |
本系統中英文摘要資訊取自各篇刊載內容。