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Acoustical mechanisms and performance of various active duct noise control systems

✍ Scribed by Sen M. Kuo; Jianming Tsai

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
451 KB
Volume
41
Category
Article
ISSN
0003-682X

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✦ Synopsis

Based on the analysis of the characteristics of sound wave propagation & a duct, three Active Noise Control (ANC) systems, which &corporate different arrangements of the secondary loudspeaker have been examined experimentally. Calculated and measured transfer functions of the plant and the error paths show good agreement in the acoustic modal frequencies of the systems. Real-time tests show a more effective noise attenuation with tree-shaped configuration than with the traditional T-shaped ANC system. The symmetric arrangement of two secondary speakers in the tree-shaped system helps in compensating the node observed at 200 Hz in the error path. This compensation can be also achieved by using an equalizer.

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