Heavyweight airdrop pitch flight control law design based on feedback linearization theory and variable structure control

The new controller is designed for the problem that the inner cargo moving and extraction exerts serious influence upon the safety of the aircraft which combined with feedback linearization and variable structure. The nonlinear system is linearized by input-output feedback linearization theories. On this basis, the system robustness is promised by the exponentially approaching rule of the variable structure theory. The whole flight control system is integrated the inner loop system for velocity and attitude tracking control using variable structure theory with the outer loop flight altitude control based on tradition PID. The simulation results show that this method is feasible and useful.