[특허]Method and apparatus to determine need for rotor blade pitch adjustment and/or blade substitution

[미국특허] Method and apparatus to determine need for rotor blade pitch adjustment and/or blade substitution 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B64C-027/72 G01M-001/22
출원번호	US-0677561 (1976-04-16)
발명자 / 주소	Chadwick James R. (Bradbury CA)
출원인 / 주소	Chadwick-Helmuth Company, Inc. (Monrovia CA 02)
인용정보	피인용 횟수 : 49 인용 특허 : 2

초록 ▼

The output of an aircraft propulsion or lift rotor blade out-of-track pick-up is processed in such a way as to enable quick determination of need for blade pitch adjustment, the approximate amount of such adjustment to optimize reduction of out-of-track vibration, and the need for blade substitution

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In the method of testing a bladed rotor having multiple blades defining an axis of rotation, said rotor comprising a helicopter lift rotor and wherein helicopter structure associated with the rotor is subject to vibratory motion due to an out-of-track condition of the rotor blades, the method employing vibration pick-up means, the steps that include shafts water mounting the pick-up means on the helicopter structure with longitudinal spacing from the lift rotor, b. rotating the rotor and operating the pick-up means to produce first vibratory signals corresponding to vibratory motion of the structure generally parallel to said axis, said first signals having an associated amplitude and clock angle about said axis, c. adjusting the effective pitch of at least one of said blades in an effort to reduce the amplitude of said vibratory signals and maintaining the adjustment constant as the rotor rotates, and d. repeating at least said (b) step to produce second vibratory signals corresponding to vibratory motion of the structure generally parallel to said axis, said second signals having an associated amplitude and clock angle about said axis, and e. determining from said first and second signals amplitudes and from said clock angles a minimum or near minimum value for said vibratory signal amplitude, and which is less than each of said first and second signal amplitudes, and f. substituting a new blade or blades for at least one of said rotor blades if said minimum or near minimum value is unacceptably large, thereby to reduce said out-of-track condition of the rotor blades. In the method of testing a bladed rotor having multiple blades defining an axis of rotation, and wherein structure associated with the rotor is subject to vibratory motion due to an out-of-track condition of the rotor blades, the method employing vibration pick-up means, carried by said structure, the steps including a. rotating the rotor and operating the pick-up means to produce first vibratory signals corresponding to vibratory motion of the structure generally parallel to said axis, b. adjusting the effective pitch of at least one of said blades in an effort to reduce the amplitude of said vibratory signals, and c. repeating said (a) and (b) steps in an effort to further reduce the amplitude of said vibratory signals, said repetition being carried out to determine a minimum or near minimum value for said vibratory signal amplitude, d. said rotor comprising a helicopter main lift rotor, and said pitch adjustment being effected by adjusting (i) the effective length of at least one pitch link connected to at least one blade, or (ii) the angularity of at least one trim tab associated with at least one blade, the selection of (i) or (ii) being determined by stroboscopically observing, for increasing forward speeds of the helicopter, the rate of rise of a cross bar target on the underside of a blade sweeping forwardly at one side of the rotor, adjustment (i) being indicated when the cross bar rises relative to a vertical bar target to another blade.

이 특허에 인용된 특허 (2) 인용/피인용 타임라인 분석

Wilson William F. (Bedford TX), Automatic one-per-rev control system.
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Wilson William F. (Bedford TX) Chadwick James R. (Bradbury CA) Helmuth James G. (Monrovia CA), Helicopter rotor balancing apparatus and method.
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이 특허를 인용한 특허 (49) 인용/피인용 타임라인 분석

Lilly, David Daniel; Kuo, Chris; Lacy, Douglas, Active blade tracker and related systems and methods.
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Swadling, Linda K.; Hinman, Bryan; Oliverius, Dan, Apparatus and method for detecting wear in rotor pitch link bearings.
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Potts, Stephen Cary; Speaks, Kenneth Wayne; Zekoff, Michael Peter, Calculation of helicopter rotor balance adjustments and coefficients using mobile devices or custom coefficients.
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Chadwick James R. (Bradbury CA) Johnson Lloyd N. (Glendora CA), Control of rotor blade stroboscopic display.
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Cherepinsky, Igor; Driscoll, Joseph T.; Kinkead, William Douglas; Wengler, Jr., Leonard M., Control surface failure detection for fly-by-wire aircraft.
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Van de Rostyne, Alexander Jozef Magdalena; Wong, Kwok Leung, Flying toy.
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Batcheller, Barry D.; Wiig, Johan A., Frequency-adaptable structural health and usage monitoring system.
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Van De Rostyne, Alexander, Helicopter.
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Van De Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter.
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Van de Rostyne,Alexander Jozef Magdalena, Helicopter.
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Van de Rostyne,Alexander Jozef Magdalena, Helicopter.
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Van de Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter.
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Van de Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter blade, shafts and fins.
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Van De Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter body.
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Kennedy Dennis K. ; Straub Friedrich K. ; Hassan Ahmed A., Helicopter in-flight rotor tracking system, method, and smart actuator therefor.
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Podgurski, Daniel M., Helicopter pitch link with accessible adjustment features.
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Van de Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter propeller.
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Van de Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter propeller rotor.
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Leak John (Swarthmore PA) Miller ; Jr. Aaron (Aston PA), Helicopter rotor system related vibration amplitude detecting system.
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Van de Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter rotor, frame and fins.
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Van De Rostyne,Alexander Jozef Magdalena; Wai,Chi Pok Billy, Helicopter rotors.
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Wai,Chi Pok Billy, Helicopter rotors, blades and shafts.
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Walker Bruce K. (Shaker Heights OH) Desai Mukund (Needham MA) Gai Eliezer (Somerville MA), Helicopter swashplate controller.
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Van de Rostyne, Alexander Jozef Magdalena; Wai, Chi Pok Billy, Helicopter with horizontal control.
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Van de Rostyne, Alexander Jozef Magdalena; Wai, Chi Pok Billy, Helicopter with main and auxiliary rotors.
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Hayden Richard E. (Sudbury MA) Ventres Charles S. (Cambridge MA) DiMarco William J. (Portsmouth RI) Floyd Mervyn D. (Nashua NH), Method and apparatus for reducing vibration over the full operating range of a rotor and a host device.
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Nodd, Zina; Nodd, Sr., Beck, Method for decorating ceiling fans.
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Clearwater Walter A. (Droitwich GB2), Method of displaying detected information about a rotating mass.
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Mesec, Gilbert Ronald, Method to detect mechanical faults and dynamic instability in rotor systems of helicopters, tilt rotor aircraft, and whirl towers.
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Felter John V. (P.O. Box 7464 Houston TX 77008), Methods and apparatus for balancing ceiling fan blades to improve their aerodynamic performance.
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John W. Hafer, Jr., Microwave blade tracker.
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Ide Hideaki,JPX ; Bandoh Shunichi,JPX ; Yasuhara Hiroshi,JPX, Pitch link for rotary wing aircraft and automatic adjuster thereof.
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Ide Hideaki,JPX ; Bandoh Shunichi,JPX ; Yasuhara Hiroshi,JPX, Pitch link for rotary wing aircraft and automatic adjuster thereof.
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Dempsey, Patrick J.; White, Matthew A.; Kellner, Aaron; King, Joshua, Relative acceleration blade position measurement.
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Van de Rostyne, Alexander Jozef Magdalena; Leung, Wong Kwok, Remote controlled toy helicopter.
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Klitgaard, Michael; Baek, Peter; Byskov, Claus, System and method for wind turbine sensor calibration.
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Goodrich Jeffrey A. (San Diego CA) Poe ; Jr. Charles M. (San Diego CA) Prsha Jeffrey A. (San Diego CA), Tachometer sensor using a lens system to a in sensing the rotational speed of an object.
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Van de Rostyne, Alexander Jozef Magdalena; Wong, Kwok Leung, Toy helicopter.
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Van de Rostyne,Alexander Jozef Magdalena, Toy helicopter.
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Van de Rostyne,Alexander Jozef Magdalena, Toy helicopter.
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Van de Rostyne,Alexander Jozef Magdalena, Toy helicopter.
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Fox, Michael; Dock, Matthew, Tracker and vibration analysis system.
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Swadling, Linda; Hinman, Bryan, Trammel assembly for rotor pitch links and method of using same.
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McDonnell,William R., Use of aerodynamic forces to assist in the control and positioning of aircraft control surfaces and variable geometry systems.
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Lynch, Michael A.; Sadok, Mokhtar; Zakrzewski, Radoslaw R., Wireless rotor track and balance system for rotorcraft.
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연합인증

[미국특허] Method and apparatus to determine need for rotor blade pitch adjustment and/or blade substitution 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허에 인용된 특허 (2) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (49) 인용/피인용 타임라인 분석

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[미국특허] Method and apparatus to determine need for rotor blade pitch adjustment and/or blade substitution 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허에 인용된 특허 (2) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (49) 인용/피인용 타임라인 분석

활용도 분석정보

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