The Application of Fuzzy Control Theory in Attitude Control of Launch Vehicle
|School||National University of Defense Science and Technology|
|Course||Aeronautical and Astronautical Science and Technology|
|Keywords||Rocket Attitude control Fuzzy Control Adaptive control|
In this paper, liquid rocket as research object, fuzzy control in its attitude control design methods are compared by simulation verification. The main results are as follows: 1. Describes the composition and attitude control system using classical control methods attitude control system design process and theoretical basis, analysts pointed out that the design shortcomings and lack of control parameter selection difficult, complex design process , the design cycle is long, poor adaptability to parameter changes. (2) conduct research on the fuzzy control method, fuzzy adaptive control system introduced species, mainly analyzes the impact of fuzzy control system performance factors, the focus of the scale factor and the adjustment factor fuzzy adaptive control method, the simulation results show that: Self- adjust the scale factor and adjustment factor fuzzy adaptive control system rise time is short, small overshoot. 3 to the existing A satellite launch vehicle as the background for a flight segment pitch channel, carried out using the general method of fuzzy control model of rigid body motion attitude control system design and simulation, and with the use of classical control systems designed The simulation results of comparison, the existing fuzzy system oscillation, cancellation rounding quantization using the analytical method to improve the fuzzy controller, the simulation results show that to be effective. 4 rigid model will be based on the design of improved fuzzy controller is applied to the attitude control system, the simulation found that the elastic vibration caused by the attitude angle is too large, and accordingly adopt filtering correction, simulation results show that this method is effective. 5 taken on the basis of pre-correction filter with the scale factor and adjustment factor fuzzy self-tuning adaptive controller instead of improved fuzzy controller, the simulation results show that the fuzzy adaptive control system performance is better than using classical control methods system and the adoption of improved fuzzy control system, and adaptability to parameter changes. 6 fuzzy adaptive control method is applied to transmit the same flight segment B star pitch channel and system simulation results show that it is feasible. Using classical control methods with simulation results comparing system performance is better. In summary, the use of fuzzy control method designed launch vehicle attitude control system is entirely feasible, and using classical control methods attitude control systems, design methods, the design process is simple, the fuzzy controller adaptability to parameter changes, the system performance is better.