標題: Implementation of a broadband duct ANC system using adaptive spatially feedforward structure
作者: Bai, MR
Zeung, P
機械工程學系
Department of Mechanical Engineering
公開日期: 11-Apr-2002
摘要: An adaptive spatially feedforward algorithm is proposed for broadband attenuation of noise in ducts. Acoustic feedback generally exists in this active noise control structure. Munjal and Eriksson (1988 Journal of Acoustical Society of America 84, 1086-1093) derived an ideal controller for the spatially feedforward structure. The ideal controller can be partitioned into two parts. The first part represents a repetitive controller that can be implemented by an infinite impulse response (IIR) filter, whereas the second part represents the dynamics of transducer that can be implemented by a finite impulse response (FIR) filter. In the paper, the IIR filter is merged with the original plant. The FIR filter is adaptively updated by the least-mean-square (LMS) algorithm to accommodate perturbations and uncertainties in the system. The proposed algorithm is implemented via a floating point digital signal processor and compared with other commonly used algorithms such as the Filtered-X LMS algorithm, the feedback neutralization algorithm, and the Filtered-U LMS algorithm. Experimental results show that the system has attained 15-7 dB maximal attenuation in the frequency band 200-600 Hz. (C) 2002 Elsevier Science Ltd.
URI: http://dx.doi.org/10.1006/jsvi.2001.4019
http://hdl.handle.net/11536/28861
ISSN: 0022-460X
DOI: 10.1006/jsvi.2001.4019
期刊: JOURNAL OF SOUND AND VIBRATION
Volume: 251
Issue: 5
起始頁: 891
結束頁: 903
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