Flap side edge liners for airframe noise reduction
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B64C-001/40
B64C-023/00
출원번호
US-0417347
(2012-03-12)
등록번호
US-8695915
(2014-04-15)
발명자
/ 주소
Jones, Michael G.
Khorrami, Mehdi R.
Choudhari, Meelan M.
Howerton, Brian M.
출원인 / 주소
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
대리인 / 주소
Warmbier, Andrea Z.
인용정보
피인용 횟수 :
6인용 특허 :
8
초록▼
One or more acoustic liners comprising internal chambers or passageways that absorb energy from a noise source on the aircraft are disclosed. The acoustic liners may be positioned at the ends of flaps of an aircraft wing to provide broadband noise absorption and/or dampen the noise producing unstead
One or more acoustic liners comprising internal chambers or passageways that absorb energy from a noise source on the aircraft are disclosed. The acoustic liners may be positioned at the ends of flaps of an aircraft wing to provide broadband noise absorption and/or dampen the noise producing unsteady flow features, and to reduce the amount of noise generated due to unsteady flow at the inboard and/or outboard end edges of a flap.
대표청구항▼
1. A flap of the type that is movably connected to an aircraft wing to provide control of an aircraft in flight, the flap comprising: an elongated flap structure defining inboard and outboard ends and a leading edge and a trailing edge, the elongated flap structure further defining an upper side ext
1. A flap of the type that is movably connected to an aircraft wing to provide control of an aircraft in flight, the flap comprising: an elongated flap structure defining inboard and outboard ends and a leading edge and a trailing edge, the elongated flap structure further defining an upper side extending between the inboard and outboard ends and between the leading and trailing edges, and a lower side extending between the inboard and outboard ends and between the leading and trailing edges, wherein the upper side generally faces upwardly in use, and the lower side generally faces downwardly in use, and wherein the inboard end defines an inwardly-facing inboard end surface and the outboard end defines an outwardly-facing outboard end surface, and wherein the upper and lower sides define inboard and outboard end portions adjacent the inboard and outboard ends, respectively, that generate noise to form a noise source in use, and a spanwise central portion disposed on the upper and/or lower sides, extending between the inboard and outboard end portions and extending between the leading and trailing edges, wherein:at least a portion of the inboard and outboard end portions of at least one of the upper and lower sides includes a substantially porous portion that is acoustically connected to at least one acoustic chamber disposed within the elongated flap structure, wherein the spanwise central portion of the flap structure is non-porous, and wherein at least a portion of the noise from the noise source enters the acoustic chamber through the porous portion and is absorbed within the flap structure. 2. The flap of claim 1, wherein: the sheet of material is on the upper side of the elongated flap structure and has a gently curved convex outer surface. 3. The flap of claim 1, wherein: at least two of the acoustic chambers have first portions that are separated by a partition having a generally uniform thickness whereby the first portions of the acoustic chambers extend generally parallel to one another. 4. The flap of claim 1, wherein: a porous bulk material is disposed in at least a portion of at least one of the acoustic chambers. 5. The flap of claim 1, wherein: the porous surface changes a boundary condition of flow around the flap structure and reduces the strength of local hydrodynamic fluctuations associated with the scrubbing of unsteady flow around the inboard and outboard ends of the flap structure. 6. The flap of claim 1, wherein: the at least one acoustic chamber absorbs noise across a frequency range of at least about 3.5 octaves. 7. The flap of claim 1, further including a porous portion is located on at least a portion of the inboard and outboard end surfaces. 8. The flap of claim 7, wherein: each porous portion comprises a surface formed from a thin sheet of material having a plurality of perforations therethrough. 9. The flap of claim 8, wherein: the perforations define a substantially uniform repeating pattern. 10. The flap of claim 1, wherein: the at least one acoustic chamber includes at least two acoustic chambers, each acoustic chamber having outer ends having openings at the porous surface, and inner ends disposed within the elongated flap structure, the inner and outer ends of the acoustic chambers defining a length therebetween, and wherein:a first one of the acoustic chambers has a first length, and a second one of the acoustic chambers has a second length that is significantly greater than the first length such that the first and second acoustic chambers tend to absorb sound having different frequencies. 11. The flap of claim 10, wherein: at least one of the acoustic chambers has an outer portion that extends inwardly from the porous surface in a first direction that is transverse relative to the porous surface, and an inner portion that extends transversely relative to the first direction. 12. The flap of claim 10, wherein: the acoustic chambers are defined by inner surfaces having one of a circular, quadrilateral, square, octagonal, hexagonal, diamond shaped, or irregular shape cross-sectional shape. 13. The flap of claim 10, wherein: at least one of the acoustic chambers forms a quarter-wavelength resonator. 14. A flap of the type that is movably connected to an aircraft wing to provide control of an aircraft in flight, the flap comprising: an elongated flap structure defining inboard and outboard ends and a leading edge and a trailing edge extending between the inboard and outboard ends, the elongated flap structure defining an upper side extending between the inboard and outboard ends and between the leading and trailing edges, and a lower side extending between the inboard and outboard ends and between the leading and trailing edges, wherein the upper side generally faces upwardly in use, and the lower side generally faces downwardly in use, and wherein the inboard end defines an inwardly-facing inboard end surface and the outboard end defines an outwardly-facing outboard end surface, and wherein the upper and lower sides define inboard and outboard end portions adjacent the inboard and outboard ends, and wherein:the leading and trailing edges of at least one of the inboard and outboard end portions are non-porous and a central portion between said leading and trailing edges of said at least one of the inboard and outboard end portions includes a substantially porous portion that is acoustically connected to at least one acoustic chamber disposed within the elongated flap structure, and wherein at least a portion of the noise from the noise source enters the acoustic chamber through the porous portion and is absorbed within the flap structure. 15. The flap of claim 14, wherein said the leading and trailing edges of both of the inboard and outboard end portions are non-porous and the central portion of both of the inboard and outboard end portions includes a substantially porous portion that is acoustically connected to at least one acoustic chamber disposed within the elongated flap structure. 16. The flap of claim 14, further including a porous portion is located on at least a portion of the inboard and outboard end surfaces. 17. The flap of claim 14, wherein: the porous portion comprises a surface formed from a thin sheet of material having a plurality of perforations therethrough. 18. The flap of claim 1, wherein a porous bulk material is disposed in at least a portion of at least one of the acoustic chambers. 19. A flap of the type that is movably connected to an aircraft wing to provide control of an aircraft in flight, the flap comprising: an elongated flap structure defining inboard and outboard ends and a leading edge and a trailing edge extending between the inboard and outboard ends, the elongated flap structure defining an upper side extending between the inboard and outboard ends and between the leading and trailing edges, and a lower side extending between the inboard and outboard ends and between the leading and trailing edges, wherein the upper side generally faces upwardly in use, and the lower side generally faces downwardly in use, and wherein the inboard end defines an inwardly-facing inboard end surface and the outboard end defines an outwardly-facing outboard end surface, and wherein the upper and lower sides define inboard and outboard end portions adjacent the inboard and outboard ends, and wherein:at least a portion of the inboard and outboard end surfaces includes a substantially porous portion that is acoustically connected to at least one acoustic chamber disposed within the elongated flap structure, and wherein at least a portion of the noise from the noise source enters the acoustic chamber through the porous portion and is absorbed within the flap structure. 20. The flap of claim 19, wherein: a porous bulk material is disposed in at least a portion of at least one of the acoustic chambers.
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이 특허에 인용된 특허 (8)
Mau, Knut; Grünewald, Michael; Reichenberger, Johann; Borchers, Ingo; Drobietz, Roger, Aerodynamic flap of an aircraft having a device which influences the flap vortex.
Lin, Juhn-Shyue; Hoffman, Herbert L.; Chewning, Gary R.; Kosanchick, III, Melvin; Poling, Hugh, Particle-filled wing-to-body fairing and method for reducing fairing vibrations.
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