Classical and fuzzy-genetic autopilot design for unmanned aerial vehicles

Authors:
A. R. Babaei;M. Mortazavi;M. H. Moradi
Affiliations:
Aerospace Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;Aerospace Engineering Department, member of Center of Excellence in Computational Aerospace, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;Medical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
Venue:
Applied Soft Computing
Year:
2011

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Abstract

In this paper, an efficient strategy is proposed to design the altitude hold mode autopilot for a UAV which is non-minimum phase, and its model includes both parametric uncertainties and unmodeled nonlinear dynamics. This work has been motivated by the challenge of developing and implementing an autopilot that is robust with respect to these uncertainties. By combination of classic controller as the principal section of the autopilot and the fuzzy logic controller to increase the robustness in a single loop scheme, it is tried to exploit both methods advantages. The multi-objective genetic algorithm is used to mechanize the optimal determination of fuzzy logic controller parameters based on an efficient cost function that comprises undershoot, overshoot, rise time, settling time, steady state error and stability. Simulation results show that the proposed strategy performances are desirable in terms of the time response characteristics for both phugoid mode and short period mode, the robustness, and the adaptation of itself with respect to the large commands.