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Indentation instrument load control method and system based on fuzzy predictive control

A technology of fuzzy prediction and control methods, applied in general control systems, control/regulation systems, reasoning methods, etc., can solve problems such as difficulty in establishing physical models, gaps between displacement sensor values ​​and real displacements, etc., and achieve robustness and stability of the system Strong performance, reduce control error, and prevent damage

Active Publication Date: 2021-05-14
XIANGTAN UNIV
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Problems solved by technology

[0003] When the indentation test is carried out, the image of the load-displacement curve is different according to the experimental test material and the set parameters. There is a gap between the value of the displacement sensor and the real displacement, and it is also affected by the deformation of the force sensor and the mechanical structure. Affected by environmental temperature and other factors, it is difficult to establish an accurate physical model, so a fuzzy predictive control algorithm is introduced to control the indentation process of the indenter

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  • Indentation instrument load control method and system based on fuzzy predictive control
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  • Indentation instrument load control method and system based on fuzzy predictive control

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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] The object of the present invention is to provide a load control method and system for an indenter based on fuzzy predictive control to solve the above existing problems, which is stable and accurate, has superior control performance and is simple to implement.

[0036] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction wi...

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Abstract

The invention relates to an indentation instrument load control method and system based on fuzzy predictive control. The method comprises the following steps: acquiring an actual measurement force value of a sensor in a loading stage; acquiring an expected force value of the nth period in the loading stage; calculating a first error and a first error change rate; establishing and optimizing a fuzzy prediction controller; determining the motion step number of a motor in the loading stage; acquiring an actual measurement value of the sensor in the full load stage; obtaining an expected force value of the nth period in the full load stage, and calculating a second error; controlling the motor to move based on the second error; acquiring an actual measurement force value of the sensor in the unloading stage; acquiring an expected force value of the nth period in the unloading stage; calculating a third error and a third error change rate; and determining the motion step number of the motor in the unloading stage. The method has the characteristics of high precision, small deviation and simple algorithm.

Description

technical field [0001] The invention relates to the field of fuzzy control, in particular to an indenter load control method and system based on fuzzy predictive control. Background technique [0002] The instrumented indentation test technology is to obtain the load-displacement relationship curve by recording the load and indentation depth, and then obtain the elastic modulus, hardness, stress-strain curve, fracture toughness, fatigue characteristics, creep characteristics, adhesion Sex and other parameters. Due to its advantages of simple test operation, high measurement efficiency and wide application range, micro-nano indentation technology is gradually becoming the first choice for testing the mechanical properties of micro / nano-scale materials and structures. Therefore, there are companies at home and abroad researching devices for micro-nano indentation testing. Since the parameters obtained by the indenter need to be obtained by analyzing the load-displacement rel...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042G01N3/06G01N3/08G01N2203/0019G01N2203/0032G01N3/42G06N5/048G05B13/0295
Inventor 马增胜彭典周益春
Owner XIANGTAN UNIV
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