Design of Test Turntable Based on Fuzzy PID Algorithm and its Error Correction

Abstract

In order to meet the requirements of antenna for high bearing capacity, high positioning accuracy and speed stability of the test turntable, a test turntable with simple operation is designed. First of all, the structure of the turntable is introduced. The turntable adopts the form of gear transmission and multi-turn absolute encoder angle measurement. The mechanical simulation analysis of the turntable table is carried out, and the static performance and modal characteristics of the turntable are analyzed. Then, the servo control system of the turntable is introduced. The multi-turn absolute encoder is used as the detection element of the actual position of the turntable. The target position is sent to the controller by the upper computer through the serial port. The controller uses the field programmable logic gate array (FPGA) as the core, and the encoder, controller and control object constitute the position loop; In the software design, the fuzzy PID algorithm is used to replace the traditional PID algorithm. Finally, the turntable accuracy test platform is built, and the autocollimator and polyhedral prism are used to obtain the angle measurement error. The test results show that the control accuracy is better than ±0.01, the system position accuracy is better than 2.5’, and the turntable positioning accuracy and rotational speed stability have been effectively improved.