Title :
Design and control of a dual stage fast tool servo for precision machining
Author :
Krishnamoorthy, K. ; Lin, Chi-Ying ; Tsao, Tsu-Chin
Author_Institution :
Dept. of Mech. & Aerosp. Eng., California Univ., Los Angeles, CA, USA
Abstract :
This work presents the design and control of a dual stage fast tool servo for precision machining of complex non-circular shapes and surface texture. A piezoelectric actuator of 20 microns motion is designed as an attachment to an existing electromagnetic linear actuator. Feedforward and integrated feedback and repetitive digital control based on mu synthesis are designed and implemented at 10.8 kHz on the electromagnetic actuator for tracking a complex engine piston profile. An iterative learning control was designed and implemented at 30 kHz on the piezoelectric attachment to generate short mechanical pulses for machining the surface texture. Simulation and experimental results are presented to demonstrate the system performance.
Keywords :
adaptive control; control system synthesis; digital control; feedback; feedforward; iterative methods; learning systems; machine tools; piezoelectric actuators; servomechanisms; surface texture; turning (machining); 10.8 kHz; 30 kHz; dual stage fast tool servo control; dual stage fast tool servo design; electromagnetic linear actuator; engine piston profile; feedforward design; integrated feedback design; iterative learning control design; mechanical pulses; noncircular shape machining; piezoelectric actuator design; repetitive digital control design; surface texture machining; Digital control; Engines; Feedback; Hydraulic actuators; Machining; Piezoelectric actuators; Pistons; Servomechanisms; Shape control; Surface texture;
Conference_Titel :
Control Applications, 2004. Proceedings of the 2004 IEEE International Conference on
Print_ISBN :
0-7803-8633-7
DOI :
10.1109/CCA.2004.1387302
