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Rotor blade with optimized twist distribution

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B64C-027/467    B64C-027/28   
미국특허분류(USC) 244/007R; 244/01711; 244/039; 416/2230R
출원번호 US-0006747 (2001-11-08)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    David M. Quinlan, P.C.
인용정보 피인용 횟수 : 17  인용 특허 : 19
초록
▼

A rotor blade has a local geometric twist angle .theta.=f(r/R), with R being the blade span and r being the distance along the blade span from the axis of rotation. The blade has an inner region between an (r/R)inner=0.20.+-.0.04 and a transition point at (r/R)trams=0.75.+-.0.04, wherein .theta.inner at (r/R)inner has a positive value and is greater than or equal to .theta.trans at (r/R)trans. A blade tip region includes a first portion between (r/R)trans and (r/R)min>(r/R)trans, wherein .theta. continuously decreases from .theta.trans to .theta.min at (...

대표
청구항
▼

1. A rotor blade including a blade root for attachment to a rotor hub for rotating said blade about an axis of rotation transverse to a blade span R between said axis of rotation and a distal end of said blade defining a blade tip, wherein said blade has a chord extending between a blade leading edge and a blade trailing edge transverse to the blade span and said chord has a local geometric twist angle .theta.=f(r/R), with r being the distance along the blade span from said axis of rotation, said blade comprising:an inner region between an inner boundary...

이 특허에 인용된 특허 (19)

  1. McKillip ; Jr. Robert M.. Actuating device with multiple stable positions. USP2001046220550.
  2. Perry Frederick John,GBX ; Harrison Robert John,GBX ; Brocklehurst Alan,GBX. Aerofoil. USP1999115992793.
  3. Asboth Oscar (Schlsselgasse 2 A-1080 Vienna ATX). Air propeller. USP1990054927330.
  4. Zimmer Herbert (Friedrichshafen DEX) Dathe Ingo (Immenstaad DEX) Hoffmann Reinhard (Brannenburg DEX) Hora Petr (Stephanskirchen DEX) Wortmann Franz X. (Bblingen DEX). Aircraft propeller. USP1986014564337.
  5. Philippe, Jean-Jacques; Lyothier, Robert M.. Blade end for rotary wing of an aircraft and rotary wing provided with such blade ends. USP1984054451206.
  6. Damongeot, Alain. Blade for an aircraft rotor and rotor comprising such a blade. USP1991075035577.
  7. Fran.cedilla.ois Valentin Gaston Toulmay FR; Mathieu Rebut CN; Peter Rudolf Stahl DE. Blade for the rotary wings of an aircraft. USP2002046364615.
  8. Charles Bruce D. ; Hassan Ahmed A. ; Tadghighi Hormoz ; JanakiRam Ram D. ; Sankar Lakshmi N.. Blade vortex interaction noise reduction techniques for a rotorcraft. USP1998015711651.
  9. Vuillet Alain E. (Bouc Belair FRX) Philippe Jean J. (Versailles FRX) Desopper Andr (Garches FRX). Blade with curved end for a rotary airfoil of an aircraft. USP1989114880355.
  10. Toulmay Fran.cedilla.ois Valentin Gaston,FRX ; Zibi Joelle Marguerite,FRX. Blade with swept-back tip for the rotary wings of an aircraft. USP1999126000911.
  11. Fradenburgh Evan A. (Fairfield CT). Helicopter blade. USP1981024248572.
  12. Fradenburgh Evan A. (Fairfield CT) Jepson William D. (Huntington CT) Moffitt Robert C. (Seymour CT). Helicopter blade with a tip having a selected combination of sweep, taper and anhedral to improve hover efficiency. USP1982044324530.
  13. Moffitt Robert C. (Seymour CT). Helicopter blade with a tip having a selected combination of sweep, taper and anhedral to improve hover efficiency. USP1982064334828.
  14. Perry Frederick J. (Yeovil GB2). Helicopter rotor blades. USP1990124975022.
  15. McKillip ; Jr. Robert M.. Remotely controllable actuating device. USP1998055752672.
  16. Kondo Natsuki,JPX ; Tsujiuchi Tomoka,JPX ; Yamakawa Eiichi,JPX. Rotor blade for rotary wing aircraft. USP2001056231308.
  17. Shimizu Toshio,JPX. Rotor blade for rotary-wing aircraft. USP2001016168383.
  18. Yamakawa Eiichi,JPX ; Murashige Atsushi,JPX ; Tsujiuchi Tomoka,JPX. Rotor blade for rotorcraft. USP2001026190132.
  19. Moffitt Robert C. ; Matuska David G. ; Fradenburgh Evan A.. Rotor system having alternating length rotor blades and positioning means therefor for reducing blade-vortex interaction. USP1998045735670.

이 특허를 인용한 특허 피인용횟수: 17

  1. Thomas, James P.; O'Brien, Michael J.; Pogue, III, William R.. Active twist hollow beam system. USP2014058721282.
  2. Thomas, James P; O'Brien, Michael J; Pogue, III, William R. Active twist hollow beam system. USP2012088246303.
  3. Leusink, Debbie; Alfano, David; Gareton, Vincent. Aircraft rotor blade of shape adapted for acoustic improvement during approach flights and for improving performance in hovering flight and in forward flight. USP20190310220943.
  4. Owen, Stephen J.. Airfoil for a helicopter rotor blade. USP2010127854593.
  5. Owen, Stephen J.. Airfoil for a helicopter rotor blade. USP2012058172540.
  6. Hsieh, Chi-Hao; Yuan, Shu-Ying. Fan structure. USP2015018939729.
  7. Weiner, Steven D.; Eadie, William J.. Main rotor rotational speed control for rotorcraft. USP20190110167079.
  8. Groen, David L.. Mission-adaptive rotor blade. USP2017039604722.
  9. Groen, David L.. Mission-adaptive rotor blade. USP2015028944365.
  10. Robertson, Daniel B.; Smith, Dudley E.; Hollimon, Charles L.; Narramore, Jimmy C.; Mullins, Robert B.. Proprotor blade with leading edge slot. USP2009097594625.
  11. Gonzalez Cuadrado, Miguel. Real-time simulation procedure for a helicopter rotor. USP2013118589131.
  12. Beckman, Brian C.; Ko, Allan. Reconfiguring propellers during aerial vehicle operation. USP20190110179646.
  13. Gonzalez, Eric R.; Stamps, Frank B.. Rotor blade having variable twist. USP20190210207793.
  14. Bagai, Ashish; Kreuscher, Lauren. Rotor blade twist distribution for a high speed rotary-wing aircraft. USP2009107600976.
  15. Waltner, Peter J.. Rotorcraft state control. USP2018049944388.
  16. Quackenbush, Todd R.; McKillip, Jr., Robert M.; Danilov, Pavel V.. Supersonic engine inlet diffuser with deployable vortex generators. USP2016089429071.
  17. McGeer, Brian T.; von Flotow, Andreas H.. Variable-twist rotor blade controlled by hub pitch angle and rotational speed. USP2010127857598.

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