|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||244/017.11 ; 244/207 ; 416/090A ; 416/092 ; 415/119|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 62 인용 특허 : 0|
A pressurized porous surface near the leading edge of a rotorcraft blade, is designed to be used as an active control device which alleviates the aerodynamics of blade vortex interactions (BVI) and thus the impulsive BVI noise levels and signature. The pressurized porous surface can be actuated on an azimuth-dependent deployment schedule or actuated continuously. The pressurized porous surface is supplied with either positively pressurized air, negatively pressurized air, or a combination of both, when actuated. The pressurized porous surface targets the...
[ What is claimed is:] [1.] An active control device for reducing blade-vortex-interaction (BVI) noise generated by a rotorcraft having a rotor blade including an interior, a tip end, a root end, a leading edge, a trailing edge, an upper surface, a lower surface, a radius, and a chord, the rotor blade being attached at the root end to a rotor hub on the rotorcraft and extending radially outwardly therefrom such that when the rotor hub is rotatably driven the rotor blade rotates about the hub through a 360 degree azimuth, the active control device compris...