STUDY OF A COMPOSITE AUTOMATIC FLIGHT CONTROL SYSTEM BY THE METHOD OF THE THEORY OF INVARIANCE,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The article investigates an automatic control system in which the conditions of autonomy of control and the conditions of invariance of the controlled parameters with respect to external perturbations would be satisfied simultaneously. The author commences by finding those equations which describe a system of automatic control of flight speed and pitching angle of the aircraft by changing engine thrust and the angular deviation of the elevator. The equations of an automatic system of control of the aircrafts longitudinal motion are found in matrix form. From the calculations, it is determined by the author that it is impossible to stabilize the flight altitude and angle of thrust of the aircraft simultaneously with only an elevator. Since, in longitudinal control, at least three coordinates are required, the differential equations of the controlled member and of the control system are obtained in matrix form. The author concludes with an investigation of simultaneously satisfying the conditions of autonomy and invariance for three parameters of the given automatic control system. Thus, the proposed automatic control system for the longitudinal motion of an aircraft solves the problem of simultaneously fulfilling the conditions of invariance and autonomy of control with respect to each of the coordinates individually.
- Flight Control and Instrumentation