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특허 상세정보

Method and system for active noise control of tiltrotor aircraft

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B64C-001/00   
미국특허분류(USC) 701/003; 415/119; 416/087
출원번호 US-0139256 (2002-04-30)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    Padilla, Robert M.Wong, Carla M.
인용정보 피인용 횟수 : 11  인용 특허 : 18
초록

Methods and systems for reducing noise generated by rotating blades of a tiltrotor aircraft. A rotor-blade pitch angle associated with the tiltrotor aircraft can be controlled utilizing a swashplate connected to rotating blades of the tiltrotor aircraft. One or more Higher Harmonic Control (HHC) signals can be transmitted and input to a swashplate control actuator associated with the swashplate. A particular blade pitch oscillation (e.g., four cycles per revolution) is thereafter produced in a rotating frame of reference associated with the rotating blad...

대표
청구항

Methods and systems for reducing noise generated by rotating blades of a tiltrotor aircraft. A rotor-blade pitch angle associated with the tiltrotor aircraft can be controlled utilizing a swashplate connected to rotating blades of the tiltrotor aircraft. One or more Higher Harmonic Control (HHC) signals can be transmitted and input to a swashplate control actuator associated with the swashplate. A particular blade pitch oscillation (e.g., four cycles per revolution) is thereafter produced in a rotating frame of reference associated with the rotating blad...

이 특허에 인용된 특허 (18)

  1. Hassan Ahmed A. ; Straub Friedrich K. ; Domzalski David B. ; Kennedy Dennis K.. Active blowing system for rotorcraft vortex interaction noise reduction. USP1998095813625.
  2. Charles Bruce D. (Mesa AZ) Hassan Ahmed A. (Mesa AZ) Tadghighi Hormoz (Gilbert AZ) JanakiRam Ram D. (Mesa AZ) Sankar Lakshmi N. (Atlanta GA). Blade vortex interaction noise reduction techniques for a rotorcraft. USP1996125588800.
  3. Charles Bruce D. ; Hassan Ahmed A. ; Tadghighi Hormoz ; JanakiRam Ram D. ; Sankar Lakshmi N.. Blade vortex interaction noise reduction techniques for a rotorcraft. USP1998015711651.
  4. Wake Brian E. ; Egolf T. Alan ; Lorber Peter F. ; Landgrebe Anton J.. Half-plow vortex generators for rotor blades for reducing blade-vortex interaction noise. USP1998085788191.
  5. Wake Brian E. ; Lorber Peter F. ; Landgrebe Anton J.. Half-plow vortex generators for rotorcraft blades for reducing blade-vortex interaction noise. USP1998075785282.
  6. Yamakawa Eiichi (Kakamigahara JPX) Murashige Atsushi (Kakamigahara JPX) Kobiki Noboru (Kakamigahara JPX). Higher harmonic control apparatus for a helicopter rotor. USP1997085655878.
  7. Fischer ; Jr. William C. (Monroe CT) Arifian Kenneth C. (Brookfield CT). Higher harmonic control system for X-Wing aircraft. USP1990084953098.
  8. Neely Michael J. (Dayton OH) Brendel Michael (Centerville OH) Savage John R. (Kettering OH). Low-noise, high-efficiency fan assembly combining unequal blade spacing angles and unequal blade setting angles. USP1997105681145.
  9. Hall Edward J. ; Meade Joseph P.. Method for reducing turboprop noise. USP1999105961067.
  10. Azuma Akira (Kawasaki JPX). Noise reduction device for rotorcraft. USP1996105562414.
  11. Liu John ; McVeigh Michael A. ; Mayer Robert J.. Pivoting spanwise-flow redirector for tiltrotor aircraft. USP2000126161800.
  12. Matsuka David G. (Huntington CT) Gronenthal Edward W. (Shelton CT) Moffitt Robert C. (Seymour CT). Rotor system having alternating length rotor blades and positioning means therefor for reducing blade-vortex interaction. USP1997045620304.
  13. 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.
  14. Moffitt Robert C. (Seymour CT) Visintainer Joseph A. (Beacon Falls CT). Rotor system having alternating length rotor blades for reducing blade-vortex interaction (BVI) noise. USP1997045620303.
  15. Succi George P. (Cambridge MA). System and method for suppressing noise produced by rotors. USP1993065217349.
  16. Reed ; III Wilmer H. (Hampton VA). System for controlling higher harmonic vibrations in helicopter rotor blades. USP1994055314308.
  17. von Wilmowsky Kaspar Freiherr,DEX. Tiltrotor helicopter. USP1998015709357.
  18. Fradenburgh Evan A. (Fairfield CT) Davis S. Jon (Orange CT) Moffitt Robert C. (Seymour CT) Visintainer Joseph A. (Beacon Falls CT). Variable diameter rotor having an offset twist. USP1993105253979.