Abstract: A technology for designing a helicopter fuzzy attitude control system and its adjustment are studied in thepaper. Based on the technology of fuzzy control, a fuzzy att itude controller is established through a combination ofexpert knowledge and training data. However, the fuzzy at titude controller cannot control the helicopter attitudeprecisely due to factors t hat it is difficult to generate a good fuzzy attitude controller and a helicopter has lots of flightmodes. In order to minimize the fuzzy attitude controller. s error and guarantee the stability of the attitude controlsystem, an online adaptive fuzzy system is presented. The online adaptive fuzzy system can modify the inputs andt he outputs of the fuzzy attitude control units, and improve the att itude control precision. T he numeric simulationr esults demonstrate the validity of the method that is put forward by this paper.

Key words: helicopter, attitude control, fuzzy control, adaptive control, simulation