Abstract
The aim of designing the inner-loop flight control law is to satisfy the flying quality requirements which include the change of CG(Center of Gravity) position due to fuel consumption, payloads drop and/or failure occurrence in major subsystems such as fuel system, etc. while operating in overall flight envelope. Since the position of CG directly affects the aircraft stability, the change of its position must be managed strictly not only by arranging the fuel tanks layout optimally in configuration design stage, but also by controlling fuel burn sequence in FMS(Fuel Management System) during flight. Additionally, by utilizing the additional informations such as weight and CG position into the inner-loop control law, improved flying qualities and maneuvering performance can be achieved in CG travel situation. In this paper, the NDI(Nonlinear Dynamic Inversion) control method which uses the CG position and weight information feedback variables is proposed. Since NDI is a novel control methodology that directly uses the vehicle dynamics, the effects of CG travel can be efficiently applied. The performances of the proposed control method are evaluated by numerical simulations including CG travel using the advanced supersonic trainer model.
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