Ultrasonic guided wave detection technology for positioning defects of composite laminated plate

A technology of composite material layer and ultrasonic guided wave, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, positioning, radio wave measurement system, etc., to improve positioning reliability and reduce error

Inactive Publication Date: 2009-11-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] In view of the technical problems existing in the existing detection and positioning methods, the purpose of the present invention is to provide a non-destructive testing method for defect p...

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  • Ultrasonic guided wave detection technology for positioning defects of composite laminated plate
  • Ultrasonic guided wave detection technology for positioning defects of composite laminated plate
  • Ultrasonic guided wave detection technology for positioning defects of composite laminated plate

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Embodiment Construction

[0011] Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0012] In order to accurately locate the two-dimensional defects in the structure, the propagation path of the guided wave must first be analyzed. The guided waves emitted by the excitation sensor propagate in the board, and all the guided waves can reach the receiving sensor through many different paths. Such as figure 1 It is shown that in the research of defect location, the signal that reaches the receiving sensor through defect reflection contains defect information, while the signal that does not reach the receiving sensor through defect reflection does not contain defect information and is useless for defect location, so it can be regarded as public. Information to be removed. The algebraic difference of the guided wave signals obtained before and after the defect in the structure can be used to obtain the difference signal. The difference sign...

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Abstract

The invention provides a nondestructive test method for positioning defects of a composite laminated plate. The method is characterized in that a multi-probe detection mode is adopted to accurately and conveniently perform two-dimensional positioning on interfacial defects of the composite laminated plate. The method comprises the following steps: (a) arranging four sensors in a square at a certain spacing on the surface of the composite laminated plate; (b) taking each sensor in the square arrangement as an excitation sensor sequentially and two sensors adjacent to the excitation sensors as receiver sensors, thus forming a multiplex defect positioning system; (c) performing cluster analysis on position information of a plurality of groups of the defects, keeping effective data and eliminating information with obvious deviation; and (d) calculating to obtain position information of the defects based on an elliptic positioning method according to time delay, and further reducing errors by an averaging method for centering, thus performing accurate two-dimensional positioning on the defects of the composite laminated plate.

Description

Technical field [0001] The invention relates to a defect location non-destructive detection method of a composite material laminated board. Background technique [0002] For the defects of composite laminates, the acoustic emission detection method is usually used at present. Acoustic emission (AE) refers to the phenomenon that the material locally emits sound waves due to the rapid release of energy. Because the sound emission signals come from defects, the sound emission signals of different defects are also different. The sound wave signals are collected by the receiving sensor and processed according to the signal. Characteristics, determine the location of the acoustic emission source. The advantage of acoustic emission detection technology is that it can realize dynamic and real-time detection, but when the sound wave is attenuated severely in the propagation path, the detection accuracy is difficult to guarantee. At the same time, it is a passive detection method, so its o...

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Application Information

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IPC IPC(8): G01N29/07G01S5/28
Inventor 徐春广周世圆胡勇肖定国许寒晖徐圆飞赵新玉郝娟孟凡武贾玉平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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