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Metal plate strain measurement method and system based on Fourier differential transformation

An inverse Fourier transform and strain measurement technology, applied in the field of signal processing, can solve problems that have not yet been reported, and achieve the effect of improving the accuracy problem

Active Publication Date: 2021-04-30
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the knowledge of material mechanics, strain is the first-order differential of displacement, and the software supporting the DIC system uses the traditional difference method to solve the strain, but the research on strain solution based on the principle of Fourier differential transformation has not been reported yet.

Method used

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  • Metal plate strain measurement method and system based on Fourier differential transformation
  • Metal plate strain measurement method and system based on Fourier differential transformation
  • Metal plate strain measurement method and system based on Fourier differential transformation

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Embodiment Construction

[0054] The following will refer to the attached Figure 1 to Figure 5 Specific embodiments of the present disclosure are described in detail. Although specific embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0055] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "compri...

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Abstract

The invention discloses a metal plate strain measurement method based on Fourier differential transformation. The method comprises the steps of smearing a measured metal plate with uniform speckles, taking the speckles as mark points during signal collection, carrying out a tensile experiment on the measured metal plate, and collecting the image signals of the mark points during the stretching of the metal plate; converting the image signal of the mark point into a displacement signal, and simultaneously performing spline interpolation for three times along the x and y directions to obtain an interpolation signal; extending the interpolation signal along the x and y directions at the same time to obtain an extended signal of the mark point; carrying out discrete Fourier transformation on the continuation signal in the x direction and the y direction to obtain a displacement signal in a wave number domain; respectively carrying out differential transformation on the displacement signals in the wave number domain to obtain a dependent variable of the continuation signal in the wave number domain; and carrying out inverse Fourier transform on the dependent variable of the continuation signal in the wave number domain to obtain real strain values of the metal plate in the x and y directions.

Description

technical field [0001] The disclosure belongs to the technical field of signal processing, and in particular relates to a method and system for measuring metal plate strain based on Fourier differential transform. Background technique [0002] With the development of the times, my country's machinery industry is increasingly prosperous. At the same time, the emphasis on the quality of mechanical products has aroused academic research on material properties and safety issues in engineering applications. This means that the requirements for the deformation performance of the material are getting higher and higher. In engineering applications, displacement and strain are the two parameters that can most intuitively reflect the deformation of materials, so the measurement of displacement and strain plays a vital role in the study of material properties. They can intuitively reflect the structure's impact on external loads, The temperature bearing capacity is also an indicator ...

Claims

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Application Information

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IPC IPC(8): G01N3/06G01N3/08G01B11/16G06F17/14G06F17/17
CPCG01N3/068G01N3/08G01B11/16G06F17/14G06F17/17G01N2203/0017G01N2203/0218G01N2203/0282G01N2203/0641G01N2203/0682
Inventor 杨志勃杨港陈雪峰张兴武田绍华李明刘一龙孙闯翟智
Owner XI AN JIAOTONG UNIV
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