Composite material damage detection method based on wavelet analysis

A composite material and wavelet analysis technology, which is applied in the analysis of materials, the analysis of solids using sonic/ultrasonic/infrasonic waves, and the material analysis using sonic/ultrasonic/infrasonic waves. To achieve the effect of reducing the number of acquired and processed damage signals, reducing the number of polling, and improving the efficiency of damage monitoring

Inactive Publication Date: 2018-04-03
HUAIYIN TEACHERS COLLEGE
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AI Technical Summary

Problems solved by technology

In actual damage monitoring, it is generally required to scan the entire large-scale sensor network, and analyze and process a large number of Lamb wave sensing signals obtained from the scanning, which makes the task load of damage monitoring very large and the execution efficiency is low.

Method used

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  • Composite material damage detection method based on wavelet analysis
  • Composite material damage detection method based on wavelet analysis
  • Composite material damage detection method based on wavelet analysis

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Embodiment Construction

[0032] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments.

[0033] see figure 1 , a composite damage detection method based on wavelet analysis, comprising the following steps:

[0034] Step S1: uniformly arrange a plurality of FBG sensors in the composite material structure to be tested to form a FBG sensor network.

[0035] The number and arrangement of fiber grating sensors that make up the fiber grating sensor network are determined according to actual needs. In the process of arranging fiber grating sensors, it is necessary to ensure that the arrangement is as uniform as possible;

[0036] Step S2: selecting a plurality of FBG sensors for impact monitoring of the composite material structure under test in the sensor network as the impact monitoring FBG sensors.

[0037] In this step, the entire FBG sensor network arranged in the composite material structure under test is used for subsequen...

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Abstract

The invention discloses a composite material damage detection method based on wavelet analysis. The method only monitors damage in a damage monitoring zone related to damage in a composite material structure without monitoring damage of the whole detected composite material structure covered with a whole optical fiber grating sensor network through the whole optical fiber grating sensor network sothat the roll poling frequency of an optical fiber grating sensor for damage monitoring is greatly reduced, the quantity of the signals of damage needing to be collected and processed is reduced andthe damage monitoring efficiency is effectively improved. A composite material damage signal is analyzed and pre-processed through a wavelet packet so that a damage signal energy spectrum is obtained.The method extracts feature vectors and is accurate and effective. Through a BP neural network model and training, a network having the function of the composite material damage identification mode is obtained, thereby realizing damage intelligent identification, solving some nonlinear problems, realizing damage identification and positioning and degree determination and being effective and feasible.

Description

technical field [0001] The invention relates to the field of composite material damage detection, in particular to a composite material damage detection method based on wavelet analysis. 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 advancement of science and technology, composite materials have become more and more widely used in various technical fields, and have been widely used in military, aerospace, transportation, electrical and electronic, and other fields. Since composite materials are easily damaged by external damage, it is very important to detect damage to composite materials. At present, there are few researches on e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/46G01N29/24G01N29/04
Inventor 孙红兵戴金桥陈勇熊树俞阿龙
Owner HUAIYIN TEACHERS COLLEGE
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