| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To more effectively cancel an acoustic wave transmitted into a duct of a turbo fan engine. <P>SOLUTION: A fan noise reduction device includes: a plasma actuator 22 which is disposed in the duct 11 of the turbo fan engine S1, generates a sound when a voltage is applied thereto; and a control unit 24 that makes the plasma actuator 22 generate the sound using an inverse phase of the acoustic wave in the duct 11. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
