Abstract
A new active noise control strategy is presented which is aimed at reducing circumferential as well as radial acoustic modes in circular and/or annular ducts as used, for example, in aircraft engines. The azimuthal mode structure of the duct sound field is measured by using circumferentially spaced sensors in several axial planes which are mounted flush with the inner duct wall. No attempt is made to control the entire primary sound field, but only the dominant azimuthal modes which are propagational in the duct. With this procedure, the number of control variables is greatly reduced. The radial modes are reduced in an indirect way, i.e., the exact radial mode structure of the primary sound field in the duct need not be known for this purpose. a)Now with LUK GmbH & Co., Industriestrasse 3, 77815 Buehl, Germany.
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