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특허 상세정보

Rotorcraft blade-vortex interaction controller

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B64C-027/00   
미국특허분류(USC) 244/1711 ; 244/1N ; 244/199
출원번호 US-0972790 (1992-11-06)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 12  인용 특허 : 0

Blade-vortex interaction noises, sometimes referred to as “blade slap”, are avoided by increasing the absolute value of inflow to the rotor system of a rotorcraft. This is accomplished by creating a drag force which causes the angle of the tip-path plane of the rotor system to become more negative or more positive.


An apparatus for decreasing blade-vortex interaction noise of a rotorcraft having a fuselage and a rotor system, comprising: control means for increasing the absolute value of inflow to the rotor system; and means for actuating the control means under flight condition when infow is near zero, wherein the control means comprises first and second drag panels mounted respectively on opposite sides of the fuselage and being movable between operative and inoperative positions by the actuating means and being vertically oriented and extending radially outwardl...

이 특허를 인용한 특허 피인용횟수: 12

  1. Challis, Douglas. Aircraft having helicopter rotor and front mounted propeller. USP2012128336808.
  2. Challis, Douglas. Aircraft with helicopter rotor, thrust generator and assymetric wing configuration. USP2013048424798.
  3. Belleville, Mathieu. Aircraft with reduced environmental impact. USP2011098011613.
  4. Shiraishi,Takayuki; Kuramochi,Kenji; Tsuura,Seiichi. Helicopter having a fusilage section and a tail section coupled thereto. USP2007107278606.
  5. Botich, Leon. Helicopter torque counteraction device. USP2013048430353.
  6. Botich, Leon A.. Helicopter torque counteraction device. USP2014088794565.
  7. Hassan, Ahmed A.; Straub, Friedrich K.; Domzalski, David B.. Oscillating air jets for implementing blade variable twist, enhancing engine and blade efficiency, and reducing drag, vibration, download and ir signature. USP2003046543719.
  8. Hassan Ahmed A. ; Tadghighi Hormoz ; Janakiram Ram D.. Oscillating air jets for reducing HSI noise. USP2001056234751.
  9. Liu John ; McVeigh Michael A. ; Mayer Robert J.. Pivoting spanwise-flow redirector for tiltrotor aircraft. USP2000126161800.
  10. Carter, Jr.,Jay W.; Lewis,Jeffrey R.. Rotor collective pitch VS Mu to control flapping and mast/rotor tilt to control rotor RPM. USP2008117448571.
  11. Bruce D. Charles ; Ahmed A. Hassan ; Hormoz Tadghighi ; Ram D. JanakiRam. Tapered/segmented flaps for rotor blade-vortex interaction (BVI) noise and vibration reduction. USP2002116478541.
  12. Botich, Leon. Torque counter-action device. USP2012078231077.