Browsing by Author "Bai, M"

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A modified H-2 feedforward active control system for suppressing broadband random and transient noises
(1996-11-21)
Bai, M
;
Chen, H
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
Three feedforward active noise control algorithms based on H-2, H-infinity, and modified H-2 optimal model matching principles are investigated in this study. The first two methods provide significant attenuation for broadband random noises. However, the H-2 and H-infinity methods generally result in high-gain controllers at high frequencies, which calls for some truncation measures in the frequency domain. The third method effectively eliminates the high-gain problem of the ordinary H-2 and H-infinity algorithms. In addition, this method is guaranteed to result in a causal and stable controller which is crucial in practical implementation. The algorithms are coded into controllers by using a floating-point digital signal processor. The experimental results show significant attenuation for stationary broadband random noises as well as transient impact noises in a duct. (C) 1996 Academic Press Limited
A modified H-2 feedforward active control system for suppressing broadband random and transient noises
(1996-11-21)
Bai, M
;
Chen, H
;
機械工程學系
;
Department of Mechanical Engineering
Three feedforward active noise control algorithms based on H-2, H-infinity, and modified H-2 optimal model matching principles are investigated in this study. The first two methods provide significant attenuation for broadband random noises. However, the H-2 and H-infinity methods generally result in high-gain controllers at high frequencies, which calls for some truncation measures in the frequency domain. The third method effectively eliminates the high-gain problem of the ordinary H-2 and H-infinity algorithms. In addition, this method is guaranteed to result in a causal and stable controller which is crucial in practical implementation. The algorithms are coded into controllers by using a floating-point digital signal processor. The experimental results show significant attenuation for stationary broadband random noises as well as transient impact noises in a duct. (C) 1996 Academic Press Limited