Abstract
Tests at an UHBR fan rig were performed to show the current status of active noise control (ANC) techniques to reduce tonal fan noise. Excellent performance of modal control approach is demonstrated at medium frequencies for a single azimuthal mode with up to three radial mode orders. A correlation analysis of the primary sound filed is established that predicts the control performance very well. Furthermore the control algorithm was enhanced to enable explicit control of a single radial mode with induct sensors only. After the control tests had been finished the data analysis revealed that the control effort was in deed concentrated solely on the target radial mode. The paper gives a detailed description of the methodology how the decomposition into a radial mode was achieved with a minimum number of sensors and actuators.
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