Closed-loop identification method for servo feed system

A technology of servo feed and identification method, which is applied in the field of CNC machine tools, can solve the problems of system dynamic characteristic evaluation, insufficient security, and limited application range, etc.

Inactive Publication Date: 2013-11-13
XI AN JIAOTONG UNIV
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Problems solved by technology

At present, the identification of the servo feed system mainly focuses on the identification of the characteristic parameters of the controlled object in the open-loop state, but its application scope is limited to the self-developed motion control system or open motion control system, and due to the open-loop state , its security is insufficient, and the identification of the characteristic parameters of the controlled object is not enough to evaluate the dynamic characteristics of the entire system, which limits its application range

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  • Closed-loop identification method for servo feed system
  • Closed-loop identification method for servo feed system
  • Closed-loop identification method for servo feed system

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Embodiment Construction

[0032] The closed-loop identification method of the servo feed system of the present invention comprises the following steps:

[0033] 1) First, the excitation position command X r Input to the servo feed system, excitation position command X r is a sinusoidal frequency sweep signal, as shown in formula (1);

[0034] Xr(t)=sin(2πft),t=0,Ts,2Ts,...,NTs

[0035] f=0:1:flim(1)

[0036] Where: Ts is the sampling period, f is the frequency of the sinusoidal position command. flim is the estimated bandwidth value of the system, generally 100Hz. In order to simplify the calculation, N is an integer multiple of 4.

[0037] 2) The servo feed system moves according to the excitation position command, and collects the excitation position command X during the movement r And feedback position output X;

[0038] 3) Perform a differential operation on the feedback position output X according to formula (2) to obtain the feedback speed output V;

[0039] V ...

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Abstract

The invention discloses a closed-loop identification method for a servo feed system. In order to overcome defects that an open-loop identification method is limited in application range, few in identified parameter kind, unsafe in operation mode, unstable and the like, the closed-loop identification method is put forward to identify characteristic parameters of the system. The method mainly comprises the steps of modeling the servo feed system, and inputting drive signals and acquiring position feedback signals in a closed-loop state. By means of the identification method, parameters of the servo feed system can be identified, dynamic characteristics of the servo feed system can be effectively evaluated through closed-loop identification on the servo feed system, the method lays a foundation for the optimization of the servo feed system, the optimization efficiency is improved, and reference evidence can be provided for fault diagnoses of the servo feed system.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, and relates to an identification method, in particular to a closed-loop identification method for a servo feed system. Background technique [0002] In the application process of industrial automation, it is often necessary to identify the characteristic parameters of the controlled object. After the characteristic parameters of the controlled object are identified, a controller that matches and satisfies the requirements can be designed. With the continuous development of industrial technology, the identification objects are complex and changeable, and various disturbances may be mixed in the collected data. Many identification methods have been proposed one after another, and the identification problem has become a separate discipline, and more and more theoretical research results have been applied to industrial production processes. The research on identification meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 冯斌梅雪松孙挪刚叶超牟恩旭任建功
Owner XI AN JIAOTONG UNIV
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