Design of a Three-Axis Turntable Servo Control Using Wirerope Transmission

Aiming at the problem of nonlinear errors and external disturbances caused by wirerope transmission in an airborne platform directly affecting the imaging quality of platform cameras, we propose a control strategy using fuzzy adaptive feedforward compensation. First, the wirerope transmission mechanism and a high-precision DC servo motor were modeled, a friction model was established, and a fuzzy adaptive proportional-integral-derivative controller was introduced for the speed loop control loop of the turntable. Based on the principles of feedforward compensation, a feedforward compensation algorithm is proposed. A compound control strategy combining feedforward compensation with a fuzzy adaptive controller is also designed. MATLAB simulation results and experiments demonstrate that this compound strategy can effectively eliminate the jitter caused by aircraft vibration and wirerope nonlinearity. The stability accuracy of the turntable is increased from 1 to 0.2 mrad, which can significantly improve imaging quality.