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Abstract: Arrangement-angle of the secondary source on the
performance of non-adaptive ANC (Active noise control) and AANC
(Adaptive active noise control) systems in ducts are analyzed and tested
in detail from theoretical and experimental aspects respectively. The
results verified that the AANC method has great advantages, and the
inclination angle between the main duct and the side-branch duct
incorporated the secondary source can optimize the interfere condition
between the primary noise wave and the secondary noise wave. A smaller
arrangement-angle results in much more amount noise attenuation, a sooner
convergence time of the AANC system, and a lower power requirement of the
secondary source. For a broadband AANC system, a smaller
arrangement-angle can improve the directional radiation ability of the
secondary source, and reduce the acoustic feedback from the secondary
source to the input microphone, and this will greatly improve the
stability of the control system. Finally, several proposals for
engineering design of the secondary source arrangement are presented.
Key words: Duct Adaptive active noise control (AANC) Secondary
acoustic source Interference condition Active noise control (ANC)
CLC No: TB535.2
TK421.6 O435
北京市自然科学基金资助项目(3002004).
Received 20040617, received in revised form 20041130
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