The goal of vertical takeoff and landing (VTOL) aircraft is to achieve operation from relatively ...

The goal of vertical takeoff and landing (VTOL) aircraft is to achieve operation from relatively small airports and yet operate as a normal aircraft in level flight. An aircraft taking off in a form similar to a missile (on end) is inherently unstable. A control system using adjustable jets can control the vehicle, as shown in Figure 2. (a) Determine the range of gain for which the system is stable. (b) Determine the gain K for which the system is marginally stable and the roots of the characteristic equation for this value of K. Aircraft dynamics R(S) Desired vertical Controller K(s + 2) s + 10 Y(s) Actual vertical path s(s – 1) path Figure 2: Control of a jumpjet aircraft. (C) Is it possible to examine the BIBO stability of a system only by doing input-output experiments without knowing its transfer function? Why or why not?