Control Research Of High-Performance Table Servo System

In recent years, with the achievements that nation gotten in the aerospace and weaponsfield, and the accelerated development in all areas, China, in the national defense of the world,has already been playing a decisive role. Flight simulator is a typical high precisionposition/velocity servo system, as a very important device used in the hardware-in-the-loopsimulation of the flight control system on the ground, playing its key role in the development ofthe aircraft and missiles, and it is sophisticated equipment which has a great economic value andsignificance on national defense construction.The turntable control system has some factors which are not conducive to improve theperformance of the system, such as strong nonlinearity, parameter and other uncertainties andmechanical resonance, and there is a lot of external interference, so it is very difficult for us toestablish a precision mathematical model for the flight simulator control system. So the classicalcontrol methods which based on the mathematical model of the controlled object can’t gain thedesired control effect. Then it is very important for flight simulator to research a new controlmethod with high precision and strong robustness to nonlinear effect, parameter uncertaintiesand external disturbances, and it becomes the key to develop high performance turntable controlsystem.Currently, there are a large number of scholars begin to explore the new control method inconnection with various problems of the turntable control servo system. At the same time,combining the various control methods into a composite control method becomes a trend. Thispaper took the sliding mode variable structure control as the basic control method, combiningintelligent control of fuzzy control, adaptive control and nonlinear control methods ofbackstepping to design a corresponding controller, and solve the issues which exist in the servosystem.The creative research work is focused on the following aspects:(1)The nonlinear mathematical model of the flight simulator was established. Particularly,the effect of the nonlinear and uncertain factors on the performance of system was analyzed.(2)The sliding mode variable structure control will cause chattering. A new controllercombining Fuzzy control and sliding mode control was designed to inhibit chattering andimprove the performance of the system. And compared with the traditional PID control andconventional sliding mode control, an adaptive Fuzzy sliding mode controller was designed.(3)Considering the nolinear and uncertain problems of servo system, a controllercombining Backstepping design, adaptive control and sliding mode control was designed to ensure robust stability and robust tracking performance of the system, and the method was usedin the control system of high precision servo system.(4)Taking the flight simulator servo system as the controlled object, the applicationresearch of the sliding mode variable structure controller which based on the disturbanceobserver was carried. A complete engineering design of the overall system was given.