ACTIVE CONTROL OF MULTI-MODAL PROPAGATIO
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S. Laugesen
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Article
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1996
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Elsevier Science
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English
โ 793 KB
The active control of tonal noise propagating in ducts at frequencies where many modes are able to propagate is considered. The final objective of the work reported is to cancel the prominent 450-500 Hz blade passing frequency of the rotary suction fans found in chimney stacks of power stations. Thr