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Damage monitoring method of composite material structure, and apparatus and system thereof

A technology for damage monitoring and composite materials, which is used in material analysis using acoustic emission technology, processing response signals of detection, etc., which can solve the problems of lack of mixed-signal separation methods, many types of structural damage, increased structural complexity and burden, etc. Achieve the effect of ensuring safety and economic benefits, reducing the loss of personnel and property, and reducing the complexity of hardware

Active Publication Date: 2015-11-18
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. There are many types of structural damage in composite materials, and the damage signal is often a mixed signal of multiple damages. At present, there is no effective separation method for mixed signals;
[0008] 2. Although the monitoring accuracy of structural damage can be improved by increasing the number of sensors, too many sensors and their leads will increase the complexity and burden of the structure

Method used

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  • Damage monitoring method of composite material structure, and apparatus and system thereof
  • Damage monitoring method of composite material structure, and apparatus and system thereof
  • Damage monitoring method of composite material structure, and apparatus and system thereof

Examples

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Embodiment 1

[0068] Embodiment 1 of the present invention provides a damage monitoring method for a composite material structure, such as figure 1 As shown, the method mainly includes:

[0069] In step 101, a sensing signal is obtained, and an analog-to-digital conversion is performed on the obtained sensing signal to obtain an acoustic emission waveform signal.

[0070] The sensing signal is a sensing signal obtained after the charge signal collected and output by the acoustic emission sensor is amplified by the charge amplifier. The embodiment of the present invention adopts at least two acoustic emission sensors to collect acoustic emission charge signals on the composite material structure, and the acoustic emission charge signals are usually aliasing of multiple types of damage signals.

[0071] After the sensing signal is obtained, the sensing signal is converted from an analog signal to a digital signal to obtain an acoustic emission waveform signal.

[0072] Step 102, performing ...

Embodiment 2

[0110] Corresponding to the damage monitoring method of the composite material structure in the first embodiment of the present invention, the second embodiment of the present invention provides a damage monitoring device for the composite material structure, such as figure 2As shown, the device includes:

[0111] The original waveform signal extraction unit 10 is used to obtain the sensing signal, and perform analog-to-digital conversion on the obtained sensing signal, and output the acoustic emission waveform signal;

[0112] A signal preprocessing unit 20, configured to preprocess the acoustic emission waveform signal, and output a preprocessed data matrix;

[0113] A sparse blind source separation unit 30, configured to perform sparse blind source separation on the preprocessed data matrix, and output separated signals;

[0114] The post-processing unit 40 is configured to perform wavelet denoising processing on the separated signal to obtain a denoised separated signal....

Embodiment 3

[0130] Embodiment 3 of the present invention also provides a damage monitoring system for a composite material structure, such as image 3 As shown, the system includes: at least two acoustic emission sensors, a charge amplifier and a data acquisition processor; wherein,

[0131] The acoustic emission sensor is used to collect the acoustic emission signal for the composite material structure and output it to the charge amplifier;

[0132] The charge amplifier is used to amplify the acoustic emission signal output by the acoustic emission sensor, and output the sensing signal to the data acquisition processor;

[0133] The data acquisition processor is used to obtain the sensing signal, and perform analog-to-digital conversion on the obtained sensing signal to obtain an acoustic emission waveform signal; perform preprocessing on the acoustic emission waveform signal to obtain a preprocessed data matrix ; performing sparse blind source separation on the preprocessed data matrix...

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Abstract

The invention discloses a damage monitoring method of a composite material structure. The method comprises the following steps: acquiring a sensing signal, and carrying out analog-to-digital conversion on the acquired sensing signal to obtain a sound emission waveform signal; preprocessing the sound emission waveform signal to obtain a preprocessed data matrix; carrying out sparse blind source separation on the preprocessed data matrix to obtain a separated signal; and carrying out wavelet denoising processing on the separated signal to obtain a denoised separation signal. The invention also discloses a damage monitoring apparatus of the composite material structure, and a system thereof.

Description

technical field [0001] The invention relates to the technical field of structural damage monitoring, in particular to a damage monitoring method, device and system for composite material structures. Background technique [0002] Composite material is a kind of heterogeneous material composed of two or more component materials with different properties and different forms through composite process. It not only retains the main characteristics of the original component materials, but also shows the original composition. New properties that are not available in different materials. With the progress of science and technology, the application of composite materials in various technical fields is becoming more and more extensive, such as aerospace technology. The advantages of composite materials are self-evident, but composite materials will inevitably be damaged during processing and use, so it is necessary to carry out real-time structural health monitoring (SHM, StructuralHe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14G01N29/44
Inventor 董韶鹏袁梅商富凯梁宇轩
Owner BEIHANG UNIV
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