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A Composite Plate Damage Detection Method Based on Toeplitz Approximation

A technology for composite material plate and damage detection, which is applied in the direction of analyzing materials, using sound waves/ultrasonic waves/infrasonic waves for material analysis, measuring devices, etc., and can solve problems such as the decrease in algorithm accuracy

Active Publication Date: 2020-12-29
SHENZHEN LOTUT INNOVATION DESIGN CO LTD
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  • Application Information

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Problems solved by technology

[0003] Ideally, the covariance matrix of the data collected by the array satisfies the Toeplitz structure, but in reality, due to the influence of various interference factors, especially noise, this matrix is ​​usually a diagonally dominant matrix. The accuracy of the algorithm based on this matrix will decrease in the case of

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  • A Composite Plate Damage Detection Method Based on Toeplitz Approximation
  • A Composite Plate Damage Detection Method Based on Toeplitz Approximation
  • A Composite Plate Damage Detection Method Based on Toeplitz Approximation

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Embodiment example

[0135] Implementation case: In order to verify the correctness of the composite material damage detection method using the local mean decomposition enhanced Toeplitz approximation method, an experiment was carried out on a GB3240 epoxy resin composite board. The size of the board is 1000mm×1000mm×3mm. The average speed of propagation on this epoxy resin board is 1586.2m / s. The experimental equipment is a structural damage detection system. The experimental sensor is a piezoelectric ceramic sensor, the model is psn33, and the size is 8mm*0.48mm. Because Lamb will scatter when it encounters damage during propagation, an iron block with a diameter of 3mm and a height of 5mm is glued on the surface of the epoxy resin plate as a simulated damage source.

[0136] First, the damage scattering signal of the composite plate is collected. The excitation sensor and the response sensor are arranged on the composite material board, wherein the response sensor is arranged in an equidistant...

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Abstract

The invention belongs to the field of engineering structure health monitoring and relates to a composite plate damage detection method based on Toeplitz approximation. The method comprises the following steps: (I): acquiring a damage scattering signal of a composite plate; (II): estimating the direction of arrival of the damage scattering signal by using Toeplitz approximation; (III): estimating the distance of the damage scattering source according to wavelet transform and Lamb wave propagation characteristics. According to the method provided by the invention, the angle is directly calculated without conducting search in a monitoring area, thus the operation time and calculation speed are reduced; moreover, by adopting a Toeplitz matrix to replace a diagonal dominant matrix, relatively high calculation precision still can be maintained at a low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the field of engineering structure health monitoring, and relates to a damage detection method for a composite material plate based on a Toeplitz approximation method. Background technique [0002] Composite material is a new material formed by optimizing the combination of material components with different properties by using advanced material preparation technology. It not only maintains the advantages of the properties of each component material, but also can obtain comprehensive properties that cannot be achieved by a single component material through the complementarity and correlation of the properties of each component. It has small specific gravity, high specific strength, high specific modulus, high temperature resistance, Corrosion resistance, fatigue resistance and other advantages, are widely used in aerospace, automobiles, ships, medicine and construction and other fields. Composite materials are prone to micro d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/44G01N29/04
CPCG01N29/041G01N29/44G01N2291/0231G01N2291/0289
Inventor 钟永腾张政浩向家伟
Owner SHENZHEN LOTUT INNOVATION DESIGN CO LTD