An identification method of numerical control machine tool structure parameters based on numerical control programming

Abstract

The invention discloses a numerical control machine tool structure parameter identification method based on numerical control programming. The method includes the following steps of establishing a system dynamics model of a numerical control machine tool, calculating a difference equation, generating a pseudorandom sequence, converting the pseudorandom sequence into a speed excitation signal of the numerical control machine tool through NC programming, achieving self-excitation by giving speed excitation signals in all interpolation periods of a numerical control system according to the speed excitation signal and through synchronous actions, collecting numerical control machine tool structure parameter identification signal data in all interpolation periods of the numerical control system through synchronous actions, selecting an identification reference model, conducting identification on the system dynamics model of the numerical control machine tool through a MATLAB system identification tool kit and collected data, and obtaining structure parameter values of the numerical control machine tool. By means of the method, excitation and identification experiments of the numerical control machine tool are completed through numerical control programming under the condition that no excitation conditions or data collection sensors are additionally arranged, excitation and data collection cost is reduced, and the method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of identification of structural parameters of machine tools, and more specifically relates to an identification method of structural parameters of numerical control machine tools based on numerical control programming. Background technique [0002] High speed, high precision, and high efficiency are the development trends of modern CNC machine tools. The dynamic performance of the servo system is an important factor affecting CNC machine tools. Its quality depends on the setting of control parameters. Control parameters will not only affect the following error of the feed system, In severe cases, the mechanical system will vibrate, affecting the processing quality and even causing damage to the equipment. For the numerical control system, the tuning of the servo system control parameters depends on the mechanical structure parameters. Accurately obtaining the values ​​of the mechanical structure parameters s...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for identifying structural parameters of CNC machine tools based on CNC programming, in which the self-excitation signal of M sequence is designed through CNC programming, which solves the problem of heavy and large CNC machine tool systems. The difficulty of inputting the excitation signal in the identification, the acquisition of the identification signal data is realized in each interpolation cycle through synchronous action, and the excitation and identification signal acquisition of the CNC machine tool can be completed through NC programming without the need for external excitation. Identification test, this method is simple, efficient, easy to use, and has strong engineering practicability

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