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Design of fuzzy pulse width modulation controller with accuracy and energy retrenchment applied to spacecraft

Zhou Yinqiang Xu Lianxin Jiang Yuxian(School of Automation Science and Electrical Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)  
The fuzzy proportional differential(PD) pulse width modulation(PWM) controller which adopts PWM and fuzzy PD control was introduced into accurate and energy-retrenched control for attitude and orbit of spacecraft.PWM can convert on-off type control to relevant accurate linear control,and fuzzy PD control can implement two speedy and energy retrenched control processes with different consumed energy restricts.The performance demands on attitude control system were analyzed in target-capture and terminal-guidance phases of extra-atmospheric kill vehicle(EKV).Fuzzy PD-PWM controllers were designed and optimized to achieve the demands.The design of membership functions and fuzzy control rules,and the selection on parameters for optimization were discussed for those controllers.Genetic algorithms(GA) were used to optimize the membership functions of input fuzzy variables for expected demands.And the fitness function design for GA was explained.The simulations prove that the optimized controllers can respectively satisfy the demands on attitude control for EKV in different phases with accuracy and energy retrenchment.
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