Drag-free control for cold air thrusters based on variable universe adaptive fuzzy PID

Cold air micro-thruster is a multi-variable, nonlinear, strong coupling system. The traditional control method is vulnerable to uncertain factors such as the satellite parameters change and load disturbance. It is difficult to obtain satisfactory control effect. This paper puts forward an adaptive variable universe fuzzy PID compound control strategy, control parameters is realized by using fuzzy control and variable region since the setting and control rules of self-adjustment. Apply it to the drag-free control of cold air thrusters based on the micro-thrust loop, the results show that the method has fast dynamic response, strong anti-interference ability and robustness, etc.