| The subject of aircraft dynamic stability and aircraft control using a fuzzy logic controller (FLC) is discussed. The mathematical modeling and equations describing air vehicle motion under asymmetric flight are also presented in this work. The solutions of the equations of motion consisting of side force, rolling moment and yawing moment for a step change in rudder, elevator and aileron are given. The control system for specific condition (flight envelope) was designed and the linguistic fuzzy rules and appropriate fuzzy variables are introduced through fuzzy set membership functions. A suitable C-program were written and used for simulation. Finally, the comparison of the performance of the fuzzy logic controller (FLC) and the linear controller based on linear regulator (LQR) is presented.; The research demonstrates that the application of the FLC leads to significant improvement in aircraft control. |
