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Control algorithm for contour error of servo system

A contour error, servo system technology, applied in the direction of digital control, adaptive control, comprehensive factory control, etc., can solve problems such as gain reduction system contour tracking performance

Active Publication Date: 2019-06-18
TAIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gain mismatch or unbalanced disturbance between the axes of the servo system will reduce the contour tracking performance of the system, and the overall contour error of the system cannot be completely and effectively reduced simply from the perspective of improving single-axis tracking accuracy.

Method used

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  • Control algorithm for contour error of servo system
  • Control algorithm for contour error of servo system
  • Control algorithm for contour error of servo system

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Embodiment Construction

[0057] A control algorithm for the contour error of the servo system proposed by the present invention will be described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "upper", "lower", "bottom" etc. is based on the orientation or positional relationship shown in the drawings The positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, "first", "second", etc. It does not indicate the importance of components, so it should not be construed as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the p...

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Abstract

The invention discloses a control algorithm for a contour error of a servo system. A single-axis sliding mode tracking controller, a fuzzy controller and a two-axis cross-coupling controller are designed according to steps. The single-axis motion control uses a fuzzy-based sliding mode control algorithm and the interference is eliminated by using switching gain of the sliding mode control. On thebasis of the single-axis sliding mode control, the fuzzy controller is introduced and the switching gain of the sliding mode control is adjusted by the continuous output of the fuzzy controller; and the upper bound of the disturbance is estimated by the integral method, so that the advantage of the high robustness of the system uncertainty and external disturbance by the sliding mode control is kept and the system buffeting is eliminated effectively. On the basis of the cross-coupling control algorithm, problems that the gains between the two axes is not matched and the external unbalanced disturbance is high are solved; and the correction amounts of all axes are compensated in real time by variable gains; the e overall contour error of the system is reduced effectively; and the two-axis linkage control is realized.

Description

technical field [0001] The invention belongs to the technical field of contour error control of a servo system, in particular to a control algorithm for a contour error of a servo system. Background technique [0002] Two-axis feed servo system is widely used in numerical control technology, and the contour accuracy is an important index to determine the quality of CNC machining workpieces. In machine tool motion control, the gain mismatch between two axis servos or external unbalanced interference will degrade the contour tracking performance of the servo system. [0003] The sliding mode control method is often used in the industry to track and control each axis, which is robust to parameter changes and disturbances, but it is easy to cause chattering, reduce system performance and even cause instability. Fuzzy control, as an effective method of using expert knowledge and experience, is especially suitable for objects that are difficult to describe with mathematical model...

Claims

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Application Information

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IPC IPC(8): G05B19/19G05B13/04
CPCY02P90/02
Inventor 王三秀
Owner TAIZHOU UNIV
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