Active control of fan noise |
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Authors: | Nobuhiko Yamasaki Hirotoshi Tajima |
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Affiliation: | (1) Department of Aeronautics and Astronautics, Kyushu University, 744 Motooka, Nishi-ku Fukuoka 819-0395, Japan |
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Abstract: | In the wake-rotor interaction fan noise, a number of the interacting modes at the blade passing frequency (BPF) and its harmonics
are generated which are prescribed by the number of stator and rotor blades etc. In the present study, the dominant mode is
tried to be suppressed by the secondary sound from the loudspeaker actuators. One of the novel features of the present system
is the adoption of the control board with the Field Programmable Gate Array (FPGA) hardware and the LabVIEW software to synchronize
the circumferentially installed loudspeaker actuators with the relative location of rotational blades under arbitrary fan
rotational speeds. The experiments were conducted under the conditions of three rotational speeds of 2004, 3150, and 4002
rpm]. The reduction in the sound pressure level (SPL) was observed for all three rotational speeds. The sound pressure level
at the BPF was reduced approximately 13 dB] for 2004 rpm] case, but not so large reduction was attained for other cases
probably due to the inefficiency of the loudspeaker actuators at high frequencies |
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Keywords: | Stator-Rotor Interaction Anti Noise Control (ANC) Cut-on Control |
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