Fuzzy logic based forebody vortex flow control
Jin Suzuki, John Valasek, Jin Suzuki, John Valasek · Guidance, Navigation and Control Conference · 1997
A Fuzzy Logic Controller is applied to lateral/directional regulator design for an aircraft equipped with forebody vortex flow controller. The flight condition of an aircraft is high angle-of-attack and low speed where conventional effectors such as rudder and differential flaps lose effectiveness. The closed loop controller consists of two controllers, full state feedback gain controller for continuous control effector, rudder and differential flaps, and three states fuzzy logic controller for bang-bang control effector, VFC nozzles. Based on the analysis of previous controller design, designer defines membership function and fuzzy rule. "Tuning " of the fuzzy logic controller has been done to optimize system performance by adjusting the fuzzy-rule. Detailed mathematical model of the system is not required for designer in these steps. The results of this paper show that application of a fuzzy logic controller improves general performance of regulator design and makes controlling of VFC activity more practical comparing to conventional controller.