반사파가 있는 관내의 능동 소음제어Active Noise Control in a Duct With Reflected Wave

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This study is to describe the effects of the duct termination conditions conditions upon the active noise attenuation system. The adaptive filtering algorithm using FIR filter is implemented for duct noise attenuation. To avoid the instability caused by the acoustic feedback, two methods are considered. One is to use a compensating FIR filter. The other is to utilize uni-directional detecting microphone and uni-directional control speaker. Experimental results show that the reflections of sound from duct terminations greatly reduce the performance of ANC system. The directionality of detecting microphone and control speaker is a major factor to decide ANC performance. When there are some reflections from both duct terminations, the noise attenuation using finite FIR filter is not enough to model the duct plant. Especially, the reflection from the upstream termination reduces the noise attenuation in the frequencies related to the distance between control speaker and upstream termination. The performance of the noise attenuation is found to be largely enhanced by using uni-directional coupler, both on detecting microphone and control speaker, even if the duct system has an arbitrary termination conditions.
Publisher
한국소음진동공학회
Issue Date
1994-02
Language
Korean
Citation

한국소음진동공학회논문집, v.4, no.2, pp.187 - 198

ISSN
1598-2785
URI
http://hdl.handle.net/10203/66752
Appears in Collection
ME-Journal Papers(저널논문)
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