Improved Active Disturbance Rejection Control of Dual-Axis Servo Tracking Turntable with Friction Observer

Electronics

Dijiang Chen¹  Qunjing Wang²  Xu Wu²  Qian Zhang³  Chao Ye⁴ 

[1] Anhui Key Laboratory of Industrial Energy-Saving and Safety, Anhui University, Hefei 230601, China;National Engineering Laboratory of Energy-Saving Motor & Control Technology, Anhui University, Hefei 230601, China;School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China;The 38th Research Institute of China Electronics Technology Group Corporation, Hefei 230088, China;

关键词: motor-drive servo system;    ADRC;    tracking control;    friction compensation;   

DOI  :  10.3390/electronics10162012

来源: DOAJ

【 摘 要 】

Friction nonlinear disturbance is one of the main factors affecting the control performance of servo tracking system. In this paper, an improved Active Disturbance Rejection Control (ADRC) scheme of dual-axis servo turntable is researched to achieve accurate tracking. Firstly, the mathematical dynamics model of dual-axis servo tracking turntable system is established. The Elastoplastic model is used to describe nonlinear friction, in which the immeasurable part is extended to be a new state. Secondly, considering the smooth and monotonic increasing property of hyperbolic tangent function, an improved tracking differentiator is introduced, which can provide better noise attenuation performance. Thirdly, based on adjustable parameter systematic pole placement method, the fuzzy control algorithm is applied to realize the intelligent tuning of the improved Extended State Observer (ESO) gains, in which the input of the fuzzy controller is the estimation error, while the output is the observer bandwidth. Finally, the improved ADRC system is transformed into a Lurie system, then the extended circle criteria are adopted to analyze the absolute stability of the proposed system. Simulation and experimental verification of the improved ADRC method for the dual-axis turntable tracking servo system are conducted. Results illustrate the effectiveness and robustness of the proposed controller.

【 授权许可】

Unknown