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A method for online tracking and smooth switching of control modes of hydraulic material testing machine

A material testing machine, control mode technology, applied in the field of online tracking, can solve the problem of difficult to achieve smooth switching, and achieve the effect of smooth switching

Active Publication Date: 2020-11-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For different control modes, the transfer function and controller parameters of the system are different, so it is difficult to achieve complete smooth switching

Method used

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  • A method for online tracking and smooth switching of control modes of hydraulic material testing machine
  • A method for online tracking and smooth switching of control modes of hydraulic material testing machine
  • A method for online tracking and smooth switching of control modes of hydraulic material testing machine

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Embodiment Construction

[0021] The control methods of the material testing machine all adopt PID control, but the system characteristics of the displacement, load and strain control modes are different, and the PID parameters of each control mode are also different. Without loss of generality, any two control modes are used to illustrate the smooth switching process between control modes, figure 1 The general switching process from control channel 1 to control channel 2 is shown.

[0022] In the figure, the control mode is in the closed-loop state of channel 1, r1 is the input command signal of channel 1, y1 is the output signal of channel 1, and is used as a feedback signal to the input terminal, e1 is the error signal of channel 1, and its value is r1 and y1 The difference, u1 is the output signal of the error signal e1 after passing through the PID-1 controller, and is the driving voltage of the control channel 1.

[0023]

[0024] In the formula, P 1 is the scaling factor of channel 1, I 1 ...

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Abstract

The invention discloses a control mode online tracking and smooth switching method for a hydraulic material testing machine. The input signal of the to-be-switched mode is closed-loop learned according to the deviation of driving voltages between the two control modes before and after switching, so that the driving signal which switches the actual driving system remains unchanged at the switchingmoment, so that the displacement, load, or strain impact does not occur during the closed-loop forming process of the switched control mode. According to the control mode online tracking and smooth switching method for the hydraulic material testing machine, the method can be universal in material testing machines, smooth switching can be realized between any two control channels, damage to the test piece will not be caused in the switching process, and requirements of various test standards can be met.

Description

technical field [0001] The invention relates to the field of hydraulic material testing machine control, in particular to an online tracking method for smooth switching of control modes. Background technique [0002] Material testing machine is an instrument used to test the physical and mechanical properties of various materials (such as metals, non-metals, composite materials, etc.), mechanical parts and engineering structures under different conditions. In order to meet the test requirements of various test standards and various materials, the control software of the material testing machine needs to have greater flexibility. For its control mode, displacement, load and strain control modes are generally required. In the test process, it is often necessary to perform flexible combination tests among various control modes. According to the requirements of the international general test standard, smooth switching must be ensured during the switching process of various contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04G01N3/02
CPCG01N3/02G05B13/042
Inventor 陈章位李潮
Owner ZHEJIANG UNIV
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