Abstract
This paper describes reduction method of Jet-Fan noise using Active Noise Control (ANC) systems. The dominant frequency component of Jet-Fan noise is the blade passing frequency (BPF) of rotating fan blades. To reduce the BPF, we have used a multi channel ANC system using four error sensors and twelve speakers. Results show, (1) Coupling one error sensor and three speakers is effective. (2) The BPF component can be reduced by 9dB three-dimensionally at the optimal position of the error sensors.
