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Identification Method of Equivalent Inertia and Equivalent Damping of Feed System of CNC Machine Tool

A technology of feed system and equivalent inertia, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve other signal difficulties and other problems

Inactive Publication Date: 2016-08-03
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Limited by the openness of CNC machine tools, it is very difficult to input signals to the motion axes of CNC machine tools except for position signals.

Method used

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  • Identification Method of Equivalent Inertia and Equivalent Damping of Feed System of CNC Machine Tool
  • Identification Method of Equivalent Inertia and Equivalent Damping of Feed System of CNC Machine Tool
  • Identification Method of Equivalent Inertia and Equivalent Damping of Feed System of CNC Machine Tool

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Embodiment Construction

[0068] The experimental method for identifying the equivalent inertia and equivalent damping of the CNC machine tool feed system provided in this embodiment includes the following steps:

[0069] Step 1: Establish a simplified second-order dynamic model of the feed system and calculate its differential equation.

[0070] figure 1 is the identification principle diagram in the embodiment, such as figure 1 Shown:

[0071] First, taking the motor shaft as the research object, according to the relevant control theory, a differential equation is established:

[0072] iK t = J e ω · + B e ω + T e - - - ( 1 )

[0073] Among them, K t is the motor torque constant, J e is the equivalent ...

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Abstract

The invention relates to an identification method of equivalent inertia and equivalent damping of a feeding system of a numerical control machine tool. The identification method comprises establishing a simplified second order dynamics model of the feeding system and calculating to obtain a difference equation of the simplified second order dynamics model; performing continuous and effective motivation on the feeding system of the numerical control machine tool through G code displacement signals and meanwhile obtaining current signal and motor rotating speed signal data of a feeding servo motor; obtaining the equivalent inertia and the equivalent damping of the feeding system of the numerical control machine tool from the difference equation according to the least square method after the current signal and rotating speed signal data are brought into the difference equation. The identification method mainly solves the problem of dynamic parameter identification during dynamic modeling of the numerical control machine tool. According to the identification method of the equivalent inertia and the equivalent damping of the feeding system of the numerical control machine tool, the inertia and the damping of the system can be identified in the closed-loop state of the machine tool accurately, the accurate modeling of a servo system of the machine tool can be achieved, and the technical basis can be provided for achievement of high accuracy and high efficiency machining control of the numerical control machine tool.

Description

technical field [0001] The invention relates to an identification method of equivalent inertia and equivalent damping of a CNC machine tool feed system, in particular, using G code displacement signals to continuously and effectively motivate the CNC machine tool feed system, using motor current data and motor speed data as parameters identification method. Background technique [0002] High speed, precision, and high efficiency are the development direction of modern CNC machine tools, but the dynamic characteristics of the feed system have an important impact on the accuracy and efficiency of high-speed machine tools. For the high-end commercial CNC system with full closed-loop control, the appropriate feed system control parameters depend on the mechanical system parameters. Inappropriate control parameters will not only cause a large following error in the feed system, but also cause vibration of the mechanical system in severe cases, resulting in a serious decline in p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 陈光胜胡惠萍李郝林
Owner UNIV OF SHANGHAI FOR SCI & TECH