The Bell-Boeing V-22 Osprey Tilt rotor is both an airplane and a helicopter. Its advantage is the ability to rotate its engines to a vertical position, as shown in Figure P7.33(a), for takeoffs and landings and then switch the engines to a horizontal position for cruising as an airplane. The altitude control system in the helicopter mode is shown in Figure P9.20. (a) Obtain the frequency response of the system for K = 100.
(b) Find the gain margin and the phase margin for this system, (c) Select a suitable gain K so that the phase margin is 40°. (Decrease the gain above K = 100.)
(d) Find the response y(t) of the system for the gain selected in part (c).

FIGURE P9.20
Tiltrotor aircraft control

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Dynamics Controller γ(x) Aliule Ris) l (20s + 1)( 10s- 1)(0.5s + ) |