Machine tool feed system feedforward control method based on GMDH (Group Method of Data Handling) data mining algorithm

A feed system and data mining technology, applied in the field of CNC machine tools, can solve problems such as deteriorating tracking performance, and achieve the effect of improving tracking accuracy and fast tracking.

Active Publication Date: 2015-09-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, when the parameters of the feedforward controller do not match the actual model parameters, the effect of compensation will deteriorate the original tracking performance

Method used

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  • Machine tool feed system feedforward control method based on GMDH (Group Method of Data Handling) data mining algorithm
  • Machine tool feed system feedforward control method based on GMDH (Group Method of Data Handling) data mining algorithm
  • Machine tool feed system feedforward control method based on GMDH (Group Method of Data Handling) data mining algorithm

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Such as figure 1 , 2 shown.

[0027] A feed-forward control method of machine tool feed system based on GMDH data mining algorithm, which collects and stores various state data of the machine tool during no-load and processing. According to the state data of no-load and constant speed, the friction torque is obtained, and then the mathematical model of the friction torque and the state quantities of the machine tool is established when the feed system is no-load by using the GMDH method. Obtaining Moment of Inertia of Feed System Using Observer Method to perform the operation ( figure 2 ) and then applied to the command feedforward compensation. According to the state data of the machining process, the mathematical model of the load torque and each state quantity of the machine tool is established by using the GMDH method. Finally, the fr...

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Abstract

The invention discloses a machine tool feed system feedforward control method based on a GMDH (Group Method of Data Handling) data mining algorithm. The machine tool feed system feedforward control method is characterized by firstly, building a friction moment model and a load moment model of a machine tool by utilizing a GMDH algorithm; secondly, compensating feedforward to an input end of a current loop after dividing the obtained friction moment model and the obtained load moment model by a torque constant of a motor, directly applying the speed of a command signal to an input position of a speed loop at the same time to complete the input of speed feedforward, multiplying the acceleration of the command signal by a coefficient, enabling a result to be acted on an input position of the current loop to complete the input of acceleration feedforward. According to the machine tool feed system feedforward control method disclosed by the invention, the tracking accuracy and high-speed response performance on position are increased, and the machining quality of a workpiece can be increased.

Description

technical field [0001] The invention relates to the technical field of numerically controlled machine tools, in particular to a data mining identification method based on various processing data of the machine tool, in particular to a command feedforward and compensation feedforward control method for the feed system of the machine tool. Background technique [0002] Improving the machining accuracy of the machine tool is to reduce the error of the CNC machine tool. Errors can be divided into two categories, static errors and dynamic errors. The dynamic error usually refers to the trajectory error caused by the overshoot and delay of the servo control system, that is, the following error. The main factors affecting the performance of the servo system are load disturbance, friction disturbance, system parameter changes and so on. [0003] The non-linearity of friction leads to large tracking error when the servo feed system starts, stops and reverses. During the machining ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/404
CPCG05B19/404
Inventor 游有鹏孙金秋杨雪峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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