Aircraft landing gear truck orientation for noise reduction
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B64C-025/00
B64C-025/34
출원번호
UP-0464105
(2006-08-11)
등록번호
US-7815143
(2010-11-08)
발명자
/ 주소
Bryant, Malcolm S.
출원인 / 주소
The Boeing Company
대리인 / 주소
Tung & Associates
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
Methods of reducing aircraft noise from landing gear during take off and landing maneuvers. An actuated multi-axle landing gear truck is oriented such that a plane through the axles is substantially parallel to the aircraft water line during approach and takeoff. The embodiment retains the capabilit
Methods of reducing aircraft noise from landing gear during take off and landing maneuvers. An actuated multi-axle landing gear truck is oriented such that a plane through the axles is substantially parallel to the aircraft water line during approach and takeoff. The embodiment retains the capability to re-orient the truck “toes up” or “toes down,” as may be required, just before touchdown to facilitate rapid application of braking and speed brake/spoiler deployment. It also maintains the capability to re-orient the truck during gear retraction after take off to fit into the aircraft wheel wells. The invention may be retrofitted to existing aircraft or deployed on new aircraft.
대표청구항▼
What is claimed is: 1. A method of reducing noise generated by an aircraft landing gear during landing, the method comprising: positioning the aircraft landing gear to a lowered position during an air-borne landing maneuver, the landing gear comprising a multi-axle truck, said multi-axle truck orie
What is claimed is: 1. A method of reducing noise generated by an aircraft landing gear during landing, the method comprising: positioning the aircraft landing gear to a lowered position during an air-borne landing maneuver, the landing gear comprising a multi-axle truck, said multi-axle truck oriented in a toes up or toes down position during said positioning; orienting the multi-axle truck to an angle of orientation while in said lowered, position such that a plane through axles of the truck is substantially parallel to deviate less than about 5 degrees with respect to a waterline of the aircraft, said orienting according a hydraulic pressure control system; and maintaining the angle of orientation in said lowered position of the multi-axle truck during said air-borne landing maneuver including an approach to landing; and, reorienting the multi-axle truck from said angle of orientation in said lowered position to a toes up position, said reorienting initiated upon determining that said aircraft is below a predetermined altitude value prior to touchdown. 2. The method of claim 1, wherein said angle of orientation is less than about 3 degrees to the waterline of the aircraft. 3. The method of claim 1, wherein the landing gear comprises an actuator adapted for orienting the multi-axle truck. 4. The method of claim 1, further comprising controlling the orienting of the multi-axle truck by a controller, the controller receiving inputs comprising landing gear position and said aircraft altitude. 5. The method of claim 4, wherein the controlling of the orienting of the multi-axle truck comprises controlling a hydraulic pressure control valve of said hydraulic pressure control system that is in fluid communication with a piston of a truck position actuator such that controlled hydraulic pressure determines a degree of extension of a piston in a truck position actuator, and the degree of extension of the piston determines the orienting of the multi-axle truck such that the plane through axles of the truck is substantially parallel to a waterline of the aircraft. 6. The method of claim 5, further comprising allowing relief of pressure in the hydraulic pressure control system to permit the multi-axle truck to assume a landing attitude when wheels of the multi-axle truck are subjected to landing forces. 7. The method of claim 1, wherein the orienting of the multi-axle truck reduces noise by about 3 dB relative to an aircraft not orienting the multi-axle truck to said angle of orientation. 8. An improvement in a method of conducting landing and take off maneuvers in aircraft equipped with a multi-axle truck landing gear, the improvement comprising: orienting the multi-axle truck to an angle of orientation, said orienting with said landing gear in a lowered position, said angle of orientation such that a plane through axles of the truck is substantially parallel to deviate less than about 5 degrees with respect to a waterline of the aircraft, said orienting according to a hydraulic pressure control system; maintaining said angle of orientation in said lowered position of the multi-axle truck during take off and landing maneuvers including approach to landing to reduce noise, relative to an aircraft not orienting the multi-axle truck to said angle of orientation; and reorienting the multi-axle truck from said angle of orientation in said lowered position to a toes up position prior touchdown in said landing maneuver and reorienting the multi-axle truck to said angle of orientation in said lowered position during ascent in said take off maneuver, said reorienting initiated upon determining that said aircraft is respectively above a predetermined altitude value following take off in said take off maneuver or below said predetermined altitude value prior to touchdown in said landing maneuver; wherein, said multi-axle truck is oriented in a toes-up or toes down position during lowering and retracting of said landing gear. 9. The improvement of claim 8, wherein said angle of orientation is less than about 3 degrees to the waterline of the aircraft. 10. The improvement of claim 8, wherein a controller controls the orienting of the multi-axle truck based on information comprising said aircraft altitude. 11. The improvement of claim 10, wherein the controlling of the orienting of the multi-axle truck comprises controlling a hydraulic pressure control valve of said hydraulic pressure control system that is in fluid communication with a piston of a truck position actuator such that controlled hydraulic pressure determines a degree of extension of a piston in a truck position actuator, and the degree of extension of the piston determines the orienting of the multi-axle truck.
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이 특허에 인용된 특허 (5)
Courtois, Maud; Ducos, Dominique, Aircraft landing gear having an independent low-noise fairing system.
Bryant, Malcom S.; Hasenoehrl, Thomas R.; Kilner, Jerome R.; Lindahl, Gary M.; Song, Taiboo, Control system and method for a semi-levered landing gear for an aircraft.
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