Pneumatic pressure stability control of ring pendulum polishing machine based on double closed loop active disturbance rejection algorithm

A double closed loop active disturbance rejection control (ADRC) method was proposed to control the pressure of pneumatic pressure servo system of loop swing polishing machine, which is difficult to control the pressure accurately due to the strong nonlinearity, model uncertainty and disturbance. Based on the dynamic mechanism model of pneumatic pressure servo system of ring pendulum polishing machine, the parameters of the known model structure are identified by Matlab system identification tool. In the case of unknown disturbance and load disturbance, the extended state observer is designed to estimate the uncertainty and disturbance of the system, and the error feedback law is used to give real-time active compensation, so as to achieve accurate pneumatic pressure control. The simulation and experimental results show that the pneumatic pressure servo system not only has good tracking performance, fast response speed, strong anti-jamming ability, but also is easy to implement in engineering.