摘要:
Apparatus and methods are disclosed for designing and manufacturing a composite structure, such as a composite rotor blade spar or composite rotor blade. A first mold may define a first mold surface and a second mold may include a rigid layer and a heated layer secured to the rigid layer and defining a second mold surface. A plurality of heating elements embedded in the second mold may be activated according to different temperature progressions to cure portions of the uncured composite rotor blade positioned coextensive therewith. In some embodiments, the second mold defines a root portion and first and second branch portions. A shear web may be placed between the branch portions during curing. The blade spar may define a complete airfoil contour or have fairings secured thereto having lines extending therethrough to a tip jet. A tip jet mounting structure and blade root attachment apparatus are also disclosed.
摘要:
A method of controlling a deflection angle of pitching stabilizer means for an aircraft. The method includes a preliminary stage for preparing at least one control relationship delivering a setpoint angle that is to be reached by the deflection angle as a function of at least one flight parameter of the aircraft and of an incidence parameter of the pitching stabilizer means. During an operational stage an operational stage (STP2), a “flight” value is determined for each of the flight parameters, a “setpoint” value is determined for the incidence parameter, a setpoint angle is determined by inputting the flight values and setpoint value into the control relationship, and at least one actuator is actuated in order to cause the deflection angle of the pitching stabilizer means to reach the setpoint angle.
摘要:
Lift offset management and control systems are provided for a rotorcraft including main rotor and auxiliary propulsor assemblies, the main rotor assembly including first and second rotors disposed to oppositely rotate relative to an airframe about a same rotational axis, and sensors disposed to generate hub moment, tip clearance and lift offset data of the main rotor assembly.
摘要:
A helicopter has a propulsion system that includes a diesel engine driven electric generator, battery storage, power inverters for converting AC current to DC current and converting DC current to AC current, and an electric motor powered main rotor and an electric motor powered tail rotor. The propulsion system is integrated with electric controls of the main rotor electric motor and the tail rotor electric motor to provide additional system efficiencies. The design of the helicopter allows a single engine helicopter to be just as safe as a twin engine design helicopter while consuming less fuel. The helicopter design also includes a main rotor tilt system which tilts the rotation axis of the main rotor forward during high-speed flight to improve the aerodynamic efficiency of the helicopter airframe and rotary wing.
摘要:
A system and method to tilt coaxial counter-rotating rotor hub assemblies relative to a fuselage. The system includes a first rotor hub assembly and a second rotor hub assembly spaced apart from the first hub assembly and carried by the fuselage. The method includes pivotally attaching the first rotor hub assembly and the second rotor hub assembly to a pivot joint and thereafter tilting the first rotor hub assembly and the second rotor hub assembly about the pivot joint with a driver.
摘要:
An apparatus for controlling a rotor of a rotary wing aircraft, including a stationary frame, a rotary propulsion shaft extending through the frame, the propulsion shaft having a first shaft portion and a second shaft portion coupled to the first shaft portion at a joint, the first shaft portion being configured to be coupled to a drive unit and the second shaft portion being pivotable relative to a centerline of the first shaft portion in two degrees of freedom about the joint, and at least one actuator coupled to the stationary frame at one end and connected to the second shaft portion at the other end so that the second shaft portion rotates relative to the at least one actuator, the at least one actuator being configured to pivot the second shaft portion in the two degrees of freedom.
摘要:
A rotor blade having conduits for supporting control lines is disclosed. The control lines extend from a rotor hub to a tip jet mounted near a distal end of the rotor blade. The conduits mount within leading and trailing edge fairings mounted to a blade spar. The conduits may be supported by bulkheads secured at discrete locations along the blade spar and secured to the leading and trailing edge fairings. The conduits may also be secured to support webs secured to the leading or trailing edge fairing and extending longitudinally therealong. The conduit may have a tapered inner surface and a tapered fitting may secure to the control line to engage the tapered inner surface.
摘要:
A method of aircraft propulsion and control more specific to rotorcraft propulsion and control using forward, neutral and aft thrust in addition to forward/aft thrust coupling from the propulsive tail assembly through cyclic and collective pitch of the non-flapping, ridged propeller/fan blades and/or from a turbojet/turbofan vectored thrust system. The cyclic blade pitch induces a drive shaft bending moment that is used to provide aircraft directional control and also provides anti-torque control for a single rotor head helicopter. The forward/reverse collective thrust actuator, phase lag elevator effect cyclic actuator and phase lag rudder/anti-torque effect cyclic actuator do not require complex control mixing. The vectored thrust system also provides aircraft directional control and anti-torque control individually or combined with the propeller/fan assembly. This assembly eliminates the requirement of rudder or elevator control on a fixed wing aircraft and the requirement of a tail rotor on a conventional helicopter while increasing speed and maneuverability. A slowed or stopped ridged X-wing rotorcraft hub with a modified circular arc airfoil would not require cyclic/collective control.
摘要:
A rotor blade assembly is disclosed including a blade spar having a duct extending therethrough and having upper and lower surfaces. A mounting structure is secured to the blade spar and defines a fluid path in fluid communication with the duct. The mounting structure likewise has upper and lower surfaces. A tip jet is secured to the mounting structure in fluid communication with the fluid path. The blade spar and mounting structure abut one another at a joint and the upper surfaces of the blade spar and mounting structure lie on a common airfoil contour extending across the joint. The lower surfaces of the blade spar and mounting structure also lie on the common airfoil contour. One or both of the blade and mounting structure include a composite material. The mounting structure may include two portions secured to one another having a distal portion of the blade spar captured therebetween.
摘要:
A rotor damper for a tail rotor of a helicopter. A main body of a resilient material is to be arranged between a drive shaft for the tail rotor and a hub on which rotor blades for the tail rotor are coupled. A flange is connected to the main body of the rotor damper. The flange includes an abutment surface for abutting an outer surface of the hub. A tail rotor including the rotor damper.