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Sensor measuring point optimization method for reducing strain field reconstruction error

A technology for reconstructing errors and optimization methods, applied in design optimization/simulation, special data processing applications, etc., can solve problems such as low accuracy of recognition results, and failure of interpolation methods to effectively use structural mechanical properties, etc., to achieve efficient solutions

Inactive Publication Date: 2020-11-13
JIANGSU UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods of strain field reconstruction based on local strain information mainly focus on the interpolation method, but the interpolation method does not effectively use the mechanical properties of the structure itself, and the accuracy of the recognition results at positions far away from the interpolation point is not high

Method used

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  • Sensor measuring point optimization method for reducing strain field reconstruction error
  • Sensor measuring point optimization method for reducing strain field reconstruction error
  • Sensor measuring point optimization method for reducing strain field reconstruction error

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Embodiment

[0092] In order to fully understand the characteristics of the invention and its applicability to engineering practice, the invention optimizes the sensor arrangement for the strain field reconstruction of the composite cantilever beam structure. The composite material layup is as follows: figure 2 shown. The cantilever beam is subjected to three typical distributed load cases, and the unit and node numbers of the model are as follows: image 3 As shown, the loading conditions are as Figure 4 shown.

[0093] The composite material is made of carbon fiber fabric, and its material parameters are shown in Table 1.

[0094] Table 1 Composite material properties

[0095]

[0096] The established finite element model is solved for each order mode, and the strain mode shapes of each order are obtained. Then establish the following optimization model to optimize the strain sensor measuring points:

[0097]

[0098] In the formula Represents a sensor scheme, i represents...

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Abstract

The invention relates to a structure strain sensor measuring point optimization method. The invention particularly relates to a sensor measuring point optimization method for reducing a strain field reconstruction error. The layout advantages of fiber grating sensors are utilized to overcome the defects in the prior art, strain field reconstruction of a structure can be realized based on a strainfield reconstruction method of a modal superposition idea. The method comprises the following steps: step (1), firstly, establishing a finite element model of an actual structure, and performing modelcorrection on the established finite element model to ensure that the established finite element model has precision meeting requirements; (2) selecting a modal order required by strain field reconstruction, and extracting a strain modal matrix of the finite element model of the structure for the corrected finite element model; and (3) constructing a function relationship between the local strainmeasurement information and the overall strain field as shown in the specification: {epsilon all}=[T]{epsilon loc}, wherein [T] is a conversion matrix, {epsilon all} is a strain field vector, and {epsilon loc} is a local measurement point matrix.

Description

technical field [0001] The invention relates to a method for optimizing a measuring point of a structural strain sensor, in particular to a method for optimizing a measuring point of a sensor for reducing strain field reconstruction errors. Background technique [0002] During the long-term service, the aircraft will inevitably be affected by fatigue, corrosion, accidental impact, etc., which will cause damage to the internal structure. The strain or displacement of key parts is an important basis for evaluating the structural health of aerospace vehicles. When the strain on the main force transmission path of the structure exceeds the allowable value, the safety state of the structure will be threatened. Therefore, real-time monitoring of strain on key parts is an important means of structural safety status assessment. Fiber Bragg Grating sensors have the advantages of light weight and anti-electromagnetic interference, which makes the structural health monitoring technol...

Claims

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Application Information

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IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor 石庆贺朱福先杨亮王璐
Owner JIANGSU UNIV OF TECH
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