Automatic Landing Control System of ALFLEX Using Double Loop Control Structure and Fuzzy Gain-Scheduling

摘要

This paper presents a flight control design of an Automatic Landing Flight Experiment (ALFLEX) vehicle using a double loop control structure (DLCS) with the fussy gain-scheduling (FGS) state-feedback. The DLCS consists of an inner- and an outer-loop. The inner-loop control law is designed by the FGS state-feedback to guarantee the stability over the entire operating range of the ALFLEX vehicle, while the outer-loop control law ia designed by a static gain to improve the tracking property. Furthermore, guidance laws for the longitudinal and the lateral direction are included in the control system to navigate the ALFLEX vehicle to a reference trajectory even if the initial condition is deviated from the nominal. The designed DLCS showed satisfactory performance in the numerical simulation of the ALFLEX.