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Numerical-control machine tool feeding control compensation method based on Actor-Critic algorithm

A CNC machine tool and feed control technology, applied in computer control, program control, general control system, etc., can solve problems such as servo system compensation and parameter tuning that have not yet been applied, to improve dynamic performance, improve efficiency, and prolong use. effect of life

Active Publication Date: 2019-11-22
ZHONGSHAN MLTOR CNC TECH CO LTD
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AI Technical Summary

Problems solved by technology

Although the Actor-Critic reinforcement learning algorithm has demonstrated a strong optimization ability, it has not yet been applied in the field of servo system compensation and parameter tuning

Method used

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  • Numerical-control machine tool feeding control compensation method based on Actor-Critic algorithm
  • Numerical-control machine tool feeding control compensation method based on Actor-Critic algorithm
  • Numerical-control machine tool feeding control compensation method based on Actor-Critic algorithm

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Embodiment

[0043] Examples, see figure 1 , a feed control compensation method for CNC machine tools based on the Actor-Critic algorithm, comprising the following steps:

[0044] Step 1) Model the CNC machine feed servo system through the Simulink simulation model, such as figure 2As shown, the model includes a PID controller, an inverter, a permanent magnet synchronous motor, and a detection link. The controlled object is the position of the feed shaft, and the detection link includes an incremental encoder, a current sensor, and a motor output torque sensor. The detected physical quantities include position, speed, current, and torque;

[0045] refer to image 3 , this embodiment adopts the CNC machine tool feed servo system with permanent magnet synchronous motor as the actuator, which is composed of PID controller, inverter, permanent magnet synchronous motor and monitoring system. Among them, the number of poles of permanent magnet synchronous motor is 8, the preset position refe...

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Abstract

A numerically-controlled machine tool feeding control compensation method based on an Actor-Critic algorithm comprises the following steps: firstly, designing a compensation link in a servo system according to the characteristics of the servo system, i.e., the problems of time delay and overshoot in an operation rising process; secondly, designing evaluation indexes according to control requirements, designing an Actor-Critic algorithm reward function by utilizing the evaluation indexes, determining Actor-Critic algorithm action parameters according to a control compensation link, and determining an algorithm iteration termination condition; and finally, operating the Actor-Critic algorithm, and determining an optimal compensation parameter. According to the method, compensation is appliedafter the PID link, the optimal compensation parameter is obtained through the Actor-Critic learning algorithm, the response speed is increased, the overshoot is reduced, and the feeding speed and precision are improved.

Description

technical field [0001] The invention belongs to the technical field of mechatronics and intelligent control, and in particular relates to a feed control compensation method for a numerically controlled machine tool based on an Actor-Critic algorithm. Background technique [0002] With the continuous and in-depth development of modern control and intelligent control theory and mechatronics technology, the CNC machine tool industry has developed rapidly. Modern CNC machine tools based on servo systems have been more and more widely used, and are now widely used in aviation and aerospace. In the production and processing of various industries such as electronics, automobiles, etc., it has become the basis for industrial production to realize automation and intelligence. [0003] As the core component of CNC machine tools, the servo system has bottlenecks such as hysteresis in the PID controller and poor robustness of the system itself. At this stage, the servo system still need...

Claims

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Application Information

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IPC IPC(8): G05B19/41
CPCG05B19/41G05B2219/34083
Inventor 张庆魏晓晗王紫琦
Owner ZHONGSHAN MLTOR CNC TECH CO LTD
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