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National Chung Hsing University Institutional Repository - NCHUIR > 工學院 > 機械工程學系所 > 依資料類型分類 > 期刊論文 >  Actuator placement and zero effect on global wide-band noise reduction in ducts with hybrid system identification technique

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/135350

標題: Actuator placement and zero effect on global wide-band noise reduction in ducts with hybrid system identification technique
作者: Lin, J.Y.;Yu, Y.T.
關鍵字: acoustic duct model;active noise control;global wide band;hybrid;system identification;acoustic duct;design;controller;feedback
日期: 2001
Issue Date: 2012-12-14 11:49:06 (UTC+8)
關連: Journal of the Chinese Institute of Engineers, Volume 24, Issue 5, Page(s) 549-558.
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.
Relation: Journal of the Chinese Institute of Engineers
Appears in Collections:[依資料類型分類] 期刊論文
[依教師分類] 林忠逸

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