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Strain field reconstruction visualization method and system based on load strain linear superposition

A linear superposition, strain field technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problem of limited engineering practicability and application scope, not suitable for complex structure strain reconstruction, inverse finite element method solution speed Fast and other problems, to achieve high engineering application value, achieve the effect of full-field strain monitoring of the structure, and make up for the insufficient number of pastes

Active Publication Date: 2021-06-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the modal superposition method is widely used in reconstruction and requires the least number of strain sensors, but its disadvantage is that the modal analysis of the structure is required in advance, and the order of the modal analysis has a great influence on the reconstruction of the deformation field. The accuracy has a great impact; the geometric interpolation method divides the plate beam structure into segments at equal intervals, and performs strain interpolation through segmented linear functions or nonlinear functions to reconstruct the structural strain state curve, but it is not suitable for strain reconstruction of complex structures; the inverse is limited The element method has a fast solution speed and the algorithm does not depend on material properties and external load properties
However, when the size of the measured object is large, the number of sensors required is too large, which limits its engineering practicability and application range

Method used

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  • Strain field reconstruction visualization method and system based on load strain linear superposition
  • Strain field reconstruction visualization method and system based on load strain linear superposition
  • Strain field reconstruction visualization method and system based on load strain linear superposition

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Embodiment 1

[0040] Such as figure 1 As shown, Embodiment 1 of the present disclosure provides a three-dimensional visualization method for beam strain field reconstruction based on linear superposition of load and strain, including the following steps:

[0041] Step 1: Carry out unit mesh division for the beam structure and calibrate the load area. Based on the concentrated force of 5000N, extract the strain of the unit nodes under the action of different load application positions, form a strain matrix of finite points under the action of different load positions and Establish a full-field strain response matrix;

[0042] Step 2: According to the finite element simulation results, a fiber grating sensor network is constructed on the surface of the beam structure in a manner that each circular hole is symmetrically arranged up and down;

[0043] Step 3: collect the strain value of the fiber Bragg grating sensor (FBG) on the surface of the beam under the static load, and obtain the column...

Embodiment 2

[0077] Embodiment 2 of the present disclosure provides a strain field reconstruction visualization system based on linear superposition of load and strain, including:

[0078] The data acquisition module is configured to: acquire beam parameter data and beam surface strain data;

[0079] The visualization update module is configured to: obtain the full-field strain value according to the acquired data, and map the full-field strain value to the unit grid node of the finite element model of the beam for visual update of the beam strain field;

[0080] Among them, the calculation of the full-field strain value includes:

[0081] According to the beam surface strain data, the strain response column vector is obtained; according to the obtained beam parameter data, the strain response matrix of the finite element node and the structure full-field strain response matrix are obtained; according to the strain response column vector and the strain response matrix of the finite element...

Embodiment 3

[0084] Embodiment 3 of the present disclosure provides a computer-readable storage medium, on which a program is stored. When the program is executed by a processor, the strain field reconstruction visualization method based on linear superposition of load and strain as described in Embodiment 1 of the present disclosure is realized. in the steps.

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Abstract

The invention provides a strain field reconstruction visualization method and system based on load strain linear superposition. The method comprises the following steps: acquiring beam parameter data and beam surface strain data; obtaining a full-field strain value according to the obtained data, and mapping the full-field strain value to a unit grid node of the beam finite element model, wherein the calculation of the full-field strain value comprises the following steps: obtaining a strain response column vector according to the surface strain data of the cross beam; obtaining a strain response matrix of finite element nodes and a structural full-field strain response matrix according to the obtained beam parameter data; obtaining a strain weight according to the strain response column vector and the strain response matrix of the finite element node; and obtaining a full-field strain value under the static load working condition according to the full-field strain response matrix and the strain weight. According to the method, a load and strain reconstruction model is established by extracting mechanical parameters such as strain on the basis of an elastic mechanics principle by applying a linear superposition means, and accurate reconstruction of the cross beam structure is realized.

Description

technical field [0001] The present disclosure relates to the technical field of strain field reconstruction, in particular to a strain field reconstruction visualization method and system based on linear superposition of load and strain. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Due to its light weight, high specific strength and high specific stiffness, aluminum alloy materials provide feasible solutions for lightweight, service life and environmental adaptability in aerospace, railway transportation, bridge construction and other fields. It plays an important role in the material application system. [0004] In the aluminum alloy load-bearing structure, the crossbeam is an important part that bears the weight of the car body and the equipment under the suspension car, and has become the most extensive load-bearing component in t...

Claims

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Application Information

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IPC IPC(8): G06F30/15G06F30/17G06F30/23G06F119/14
CPCG06F30/15G06F30/17G06F30/23G06F2119/14
Inventor 张雷程洋洋姜明顺贾磊隋青美
Owner SHANDONG UNIV
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