Influence of control system algorithms on the maneuvering characteristics of the aircraft

Abstract

The paper presents the results of a study of the flight dynamics of a hypothetical maneuverable airplane, the shortcomings of the stability and controllability characteristics of which are compensated by algorithms of the system of improving stability and controllability by introducing a complex border of the permissible angle of attack depending on the flight mode. The research was based on a mathematical model of the airplane as a material point, taking into account the restrictions on altitude and flight speed, g-load, angle of attack, as well as the rate of change of g-load and roll. The purpose of the research is to establish the effect of the operation of the specified control system algorithms on the nature and area of safe execution of the "coup-type" maneuver. As a result of the research, it was found that the functioning of special algorithms of the electric remote-control system, leads to the emergence of areas of the operational range of altitudes and flight speeds, in which there is a significant and sharp deterioration of the maneuverability of the aircraft. Consequently, any "improvement" of the aircraft's flight performance using an automatic control system requires an assessment of the effect of these changes on the aircraft's maneuverability in all possible flight modes. KeywordsAircraft automatic control system • The electric remote-control system of the aircraft • Flight dynamics • Flight safety • Simulation of aircraft flight dynamics List of symbols c xa Drag coefficient c ya Lifting force coefficient M Mach velocity α perm Permissible angle of attack z g Coordinates of the aircraft in the normal earth coordinate system along the z-axis x g Coordinates of the aircraft in the normal earth coordinate system along the x-axis V instr Instrumental velocity [m/s] V Aircraft velocity B Maxim Shkurin

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