Title :
Simulation on a Fuzzy-PID Position Controller of the CNC Servo System
Author :
Huang, Xiaodiao ; Shi, Liting
Author_Institution :
Mechatronics Inst., Nanjing Univ. of Technol.
Abstract :
Variation of the system parameters and external disturbances always happen in the CNC servo system. With a traditional PID controller, it will cause large overshoot or poor stability. In this paper, a fuzzy-PID controller is proposed in order to improve the performance of the servo system. The proposed controller incorporates the advantages of PID control which can eliminate the steady-state error, and the advantages of fuzzy logic such as simple design, no need of an accurate mathematical model and some adaptability to nonlinearity and time-variation. The fuzzy-PID controller accepts the error (e) and error change(ec) as inputs ,while the parameters kp, ki, kd as outputs. Control rules of the controller are established based on experience so that self-regulation of the values of PID parameters is achieved. A simulation model of position servo system is constructed in Matlab/Simulink module based on a high-speed milling machine researched in our institute. By comparing the traditional PID controller and the fuzzy-PID controller, the simulation results show that the system has stronger robustness and disturbance rejection capability with the latter controller which can meet the performance requirements of the CNC position servo system better
Keywords :
computerised numerical control; control engineering computing; digital simulation; fuzzy control; fuzzy logic; mathematics computing; milling machines; position control; servomechanisms; three-term control; CNC servo system; Matlab; Simulink; fuzzy logic; fuzzy-PID position controller; milling machine; simulation model; Computer numerical control; Control system synthesis; Control systems; Error correction; Fuzzy logic; Mathematical model; Servomechanisms; Stability; Steady-state; Three-term control;
Conference_Titel :
Intelligent Systems Design and Applications, 2006. ISDA '06. Sixth International Conference on
Conference_Location :
Jinan
Print_ISBN :
0-7695-2528-8
DOI :
10.1109/ISDA.2006.237