IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0490834
(2009-06-24)
|
등록번호 |
US-8226364
(2012-07-24)
|
우선권정보 |
FR-08 03619 (2008-06-27) |
발명자
/ 주소 |
- Manfredotti, Thomas
- Cranga, Paul
- Guitton, Julien
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
2 |
초록
▼
Described is a blade (10) extending longitudinally from a root (11) of the blade (10) to a free end (12) of the blade (10), the blade (10) being provided with an incorporated resonator (20) for reducing the drag movements (F1, F2) of the blade (10), the resonator (20) being provided with a closed ta
Described is a blade (10) extending longitudinally from a root (11) of the blade (10) to a free end (12) of the blade (10), the blade (10) being provided with an incorporated resonator (20) for reducing the drag movements (F1, F2) of the blade (10), the resonator (20) being provided with a closed tank (30) that is partially filled with a liquid (50). Furthermore, the resonator (20) includes a central tube (40) immersed inside the tank (30), the tank (30) and the central tube (40) being arranged in a longitudinal direction (Y) of the blade (10), the central tube (40) having first and second ends (41, 42) that communicate with the tank (30) so that the liquid (50) can move from the tank (30) into the central tube (40), and vice versa.
대표청구항
▼
1. A blade (10) extending longitudinally from a root (11) of the blade (10) to a free end (12) of said blade (10), the blade (10) being provided with an incorporated resonator (20) for reducing the drag movements (F1, F2) of said blade (10), said resonator (20) being provided with a closed tank (30)
1. A blade (10) extending longitudinally from a root (11) of the blade (10) to a free end (12) of said blade (10), the blade (10) being provided with an incorporated resonator (20) for reducing the drag movements (F1, F2) of said blade (10), said resonator (20) being provided with a closed tank (30) that is partially filled with a liquid (50), wherein said resonator (20) includes a central tube (40) immersed inside said tank (30), the tank (30) and the central tube (40) being arranged in a longitudinal direction (Y) of the blade (10), said central tube (40) having first and second ends (41, 42) that communicate with said tank (30) so that said liquid (50) can move from the tank (30) into the central tube (40), and vice versa. 2. A blade according to claim 1, wherein said tank (30) includes fastener means (33) for fastening said central tube (40) to an inside wall (38) of said tank (30). 3. A blade according to claim 1, wherein said first and second ends (41, 42) of the central tube (40) are open and open out into the inside of said tank (30). 4. A blade according to claim 1, wherein said tank (30) presents symmetry of revolution about a first axis of symmetry (AX1). 5. A blade according to claim 1, wherein said central tube (40) presents symmetry of revolution about a second axis of symmetry (AX2). 6. A blade according to claim 4, wherein said tank (30) and said central tube (40) have respective first and second axes of symmetry (AX1, AX2), and said first and second axes of symmetry (AX1, AX2) coincide. 7. A blade according to claim 6, wherein said first and second axes of symmetry (AX1, AX2) coincide with a longitudinal axis (AXL) of said blade extending along said longitudinal direction (Y). 8. A blade according to claim 1, wherein said tank (30) is provided in succession going from the root (11) of the blade (10) towards its free end (12) with first and second end zones (31, 32) having respective first and second dimensions (DIM1, DIM2) in a transverse direction (X) of said blade (10) perpendicularly to said longitudinal direction (Y), said first dimension (DIM1) being greater than the second dimension (DIM2). 9. A blade according to claim 1, wherein said fluid possesses a maximum viscosity of 2000 centistokes. 10. A rotorcraft rotor provided with a hub (1) suitable for rotating about an axis of rotation (1′), at least one blade (10) being fastened to said hub (1) via a drag hinge (2), wherein said blade (10) is a blade according to claim 1 that is provided with a resonator (20) comprising a tank (30) and a central tube (40), each presenting symmetry of revolution, said tank (30) being provided with first and second end zones (41, 42) in succession going from the root (11) of the blade (10) towards its free end (12), the angular frequency (ω) of said resonator (20) being determined by the following relationship: ω=Ω×R0[1+(R1R2)2]×(R0′-R0) where: × represents the multiplication sign;ω represents the angular frequency of the blade resonator in radians per second;Ω represents the speed of rotation of the rotor;R0 represents the spacing between said axis of rotation and the liquid when the blade is in a mean position;R1 represents the first radius of the first end zone;R2 represents the second radius of said central tube; andR′0 represents the spacing between said axis of rotation from a face of the second end zone further away from the root of the blade. 11. A method for limiting the drag movements (F1, F2) of a blade (10) extending longitudinally from a root (11) of the blade (10) to a free end (12) of the blade (10), wherein said resonator (20) comprises a tank (30) having a central tube (40) immersed therein, and a liquid element (50) of a resonator (20) incorporated in the blade (10) is shifted in a longitudinal direction (Y) of said blade (10) so as to create secondary Coriolis forces (C1, C2) opposing the drag movement (F1, F2) of the blade (10) by causing at least some of said liquid (50) to pass from the tank (30) towards the central tube (40) or from the central tube (40) towards the tank. 12. A method according to claim 11, wherein the method is performed by a blade (10) extending longitudinally from a root (11) of the blade (10) to a free end (12) of said blade (10), the blade (10) being provided with an incorporated resonator (20) for reducing the drag movements (F1, F2) of said blade (10), said resonator (20) being provided with a closed tank (30) that is partially filled with a liquid (50), wherein said resonator (20) includes a central tube (40) immersed inside said tank (30), the tank (30) and the central tube (40) being arranged in a longitudinal direction (Y) of the blade (10), said central tube (40) having first and second ends (41, 42) that communicate with said tank (30) so that said liquid (50) can move from the tank (30) into the central tube (40), and vice versa.
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