摘要:
Disclosed is a field repairable airfoil structure such as a wing or a rotor blade and a method for repair and removal of erosion or impact damage to elastomeric coatings on surfaces such as the leading edge of the airfoil using special hand sandable coatings and preformed molded boots, preformed sheets or tapes with an optional topcoat applied thereto having higher sand erosion resistance.
摘要:
A rotary blade (28) includes a blade tip assembly (34) with a first bus bar segment (46) and a main blade assembly (32) with second bus bar segment (48). The first bus bar segment is connected to the blade tip assembly and the second bus bar segment is connected to the main blade assembly. The blade tip assembly is connected to the main blade assembly such that the first and second bus bar segments are longitudinally offset from one another. A low-profile interconnect (100; 200) spans the first and second bus bar segments for resistively generating less heat than the bus bar segments for a predetermined current flow.
摘要:
A blade tracking system for a rotary wing aircraft (10) includes a blade sensor (30) mounted on a blade (24) of the rotary wing aircraft (10), the blade sensor (30) wirelessly transmitting blade data; a reference sensor (32) mounted to the rotary wing aircraft, the blade (24) driven by the rotor hub (26), the reference sensor (32) transmitting reference data; and a processor (36) receiving the blade data and the reference data, the processor (36) determining at least one of lead-lag, flap and pitch of the blade in response to the blade data and the reference data.
摘要:
A rotor blade assembly for providing vertical lift to an aircraft, having a rotor head and a plurality of blades, with each blade attached to a mechanism such as a cam surface, whereby movement of the mechanism causes the radial distance between the distal tip of the attached blade and the center of the rotor head to alter, decreasing or increasing the length of the lifting surface. The blades are moved from a fully extended position providing maximum lift, to a retracted position in which the blades are removed from the airstream. The pitch of the blades may be controlled by a pitch controller to achieve full helicopter responsiveness. A plurality of bladeletts may be positioned near the outer periphery of the rotor head. When they are moved into the airstream, passing air impacts the bladeletts exerting a pressure, causing rotational movement of the rotor blade assembly.
摘要:
An aerofoil (12a, 12b, 12c, 12d) has a main portion of aerofoil cross section, an inner spanwise root end where the aerofoil is in use secured to a supporting structure, and at an outermost spanwise end outboard of the main portion, beyond a tip station, a tip region, and the tip region including a tip edge, the planform configuration of the tip edge lying on a first Bezier curve constructed from at least four control points P1, P2, P3 and P4, the control points P1, P2, P3 and P4 each lying on the periphery of a polygon which bounds the tip region, Bezier control point P1 being located on a leading edge of the aerofoil at the tip station, which is at a spanwise position between 93.5%R and 95.9%R, where first and second sides of the polygon meet, the first side being at the tip station extending perpendicularly to a blade reference axis, which extends spanwise of the main portion of the aerofoil, and the second side being a tangent to the leading edge of the aerofoil at control point P1, which extends between control point P1 to a position where the second side meets a third side of the boundary polygon at a position outwardly of the tip edge, the third side being parallel to the first side and extending between the position where the third side meets the second side, to where the third side and a fourth side meet, control point P2 being located on the second side at a position between 30% and 80% along the second side from P1, control point P3 being located on the third side at a position between 30% and 90% along the third side from where the second and third sides meet, and control point P4 being located at the outermost tip edge point at a trailing edge of the aerofoil, where R is the effective aerofoil span.
摘要:
The invention relates to a blade (3) for a turbomachine, in particular for a rotor (2) of a helicopter, comprising a main section (5) that is designed to create a flow in the surrounding medium and that extends from a hub section (4) to a blade tip region (7). An end piece (6) for influencing eddy formation is provided in the blade tip region (7). To achieve a substantial noise reduction, the end piece (6) is designed as a rounded flow body comprising at least one groove (13a, 13b, 13c; 13d, 13e, 13f) originating in the transition region (12) between the body and the main section (5), substantially in the direction of the blade axis (8) and curving towards the trailing edge (11) of the blade (3).
摘要:
Methods and apparatus are provided for making a rotor blade spar (14) from composite material wherein a multi-component mandrel (10) is used to form the composite spar (14). The mandrel (10) is made using a number of components (38,44, 50, 56) that are assembled and held in place using a roller assembly(62). The roller assembly (62) is removed after pre-cure lay up and compaction of the composite material. Once the roller assembly (62) is removed, the remaining mandrel components (38, 44, 50, 56) can be separated from each other and easily removed from the spar (14). The mandrel components, including the roller assembly ( 62 ), can then be re-assembled and re-used to form additional composite spars.