Control Method of Motion Error Compensation for NC Machine Tools
Advanced Technology R&D Center, Mitsubishi Electric Corporation
8-1-1 Tsukaguchi-honmachi, Amagasaki, Hyogo 661-8661, Japan
Servo systems of NC machine tools must minimize trajectory control tracking error by preventing machine resonance and trajectory error between forward and backward paths by improving symmetry. To address such issues, we propose two-degree-of-freedom control using a reference model and a servo control method with the mechanical-characteristics-compensator to compensate for machine vibration. Results of experiments confirmed the effectiveness of our proposed control.
-  L. Carlitz, “A Note on the Bessel Polynomials,” Duke Math J., Vol.24, pp. 151-162, 1957.
-  E. Dumetz, F. V. Hende, and P.J.Barre, “Resonant load Control Methods Application to high-speed machine tool with linear motor,” in Proc. 8th IEEE Intl. Conf. on Emerging Technology and Factory Automation, Vol.2, pp. 23-31, 2001.
-  G. Ellis, “Control System Design Guide,” 2nd ed. San Diego, CA: Academic Press, 1991.
-  G. F. Franklin, J. D. Powell, and A. Emami-Naeini, “Feedback Control of Dynamic Systems,” 3rd ed. Reading, MA: Addison-Wesley, 1994.
-  Y. Hori, “A Review of Torsional Vibration Control Methods and a Proposal of Disturbance Observer-based New Techniques,” in Proc. 13th IFAC World Congress, pp. 7-13, 1996.
-  T. Iwasaki, T. Sato, A. Morita, and H. Maruyama, “Auto-Tuning of Two-Degree-of-Freedom Motor Control for High-Accuracy Trajectory Motion,” Control Eng. Practice, Vol.4, No.4, pp. 537-544, 1996.
-  M. Koyama and M.Yano, “Two Degrees of Freedom Speed Controller using Reference System Model for Motor Drives,” in Proc. European Power Electronics Conference, 1991.
-  K. Nagaoka and T. Sato, “A Study on Feedforward Controller for CNC Machine Tools,” in Proc.2nd Intl. Conf. on Positionning Technology, pp. 71-72, 2006.
-  L. Y. Pao and W. E. Singhose, “On the Equivalence of Minimum Time Input Shaping with Traditional Time-Optical Control,” in Proc. 4th IEEE Conf. on Control Applications, 1995.
-  D. E. Torfs, R. Vuerinckx, J. Swevers, and J. Schoukens, “Compareson of Two Feedforward Design Methods Aiming at Accurate Trajectory Tracking of the End Point of a Flexible Robot Arm,” IEEE Trans. Control Systems Technology, Vol.6, No.1, pp. 2-14, 1998.