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V-22 tilt-rotor mechanism
Transcript of V-22 tilt-rotor mechanism
capable of extraction. can have maneuverability
problems that rotary wing
aircraft would not have, Fixed Wing Aircraft, Rotary Wing Aircraft airspeed of
the aircraft rotor speed relative
to aircraft rotor blade airspeed How do we deal with this? Special blade geometries such as this
BERP rotor blade can also be used **max 400 km/h But none of it is enough! A flapping blade will eventually reach its stall angle and flow will separate. The advancing blade will eventually reach the sound barrier and a shock wave will form. Why do we need the V-22? Tilt Mechanism
Interlock Shaft Power Transfer Interlock System Design Alternative Rotor blades are designed to "flap" in order to attenuate the effects of disymmetry of lift. & **max 315km/h Coaxial, contra-rotating rotors attempt
to balance out the disymmetry. What makes the V-22 better? It can hover and rotate
like a helicopter, by tilting one engine forward
and the other back and strafe like a helicopter too. By changing the pitch angle of the rotor blades... the thrust of each engine can be controlled. This generates a moment about the body. start Angle of attack of the retreating blade increases to compensate for reduced speed. Angle of attack of the advancing blade decreases. Shaft Design Once the V-22 is tilted, ... the horizontal component of
the thrust allows it to strafe. have limited speed and range because at higher speeds, lift becomes assymmetric. And yet it has the range and speed of a fixed wing aircraft! Beam deflection is caused by
lift forces applied at the tips
of the wings 4 joints minimum required for the up concavity of the wing deflection A B B A B B Clutch A engaged
Clutches B are not
Worm rotates Clutches B engaged to transfer
power through the interlock shaft Similar to two connected U-joints Allows for constant
rotational speeds which
a single U-joint cannot do A B Gear ratios affect performance if N is the ratio of
driving:driven N > 1, angular velocity
increases and torque
decreases N < 1, the converse
occurs Double Cardan Joint Current airframes have serious tactical limitations. *pass to Doron But how do we tilt the rotors? Bolt Flange