Active Noise Control (ANC) of higher order modes in a circular duct is studied. To overcome the limitations of a modal approach to locate the error sensors, an alternative strategy, referred to as the error sensor plane concept, is proposed. The basic objective of the error sensor plane concept is to create a quiet cross-section in the duct so that the noise from the primary source cannot propagate over this section. To create this quiet cross-section, a network of error microphons is located in the cross-section of the duct.
展开▼
