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A Method for Obtaining Ultrasonic-Acoustic Emission Detection Signals of Composite Materials

A technology for acoustic emission detection and acoustic emission signals, which is applied in the detection of response signals and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc. - Problems such as the complex law of acoustic emission signals, to achieve the effects of improved detection resolution, clear defect discrimination rules, and overcome waveform transformation and multiple emission/refraction

Active Publication Date: 2016-08-24
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current ultrasonic-acoustic emission detection signal acquisition method is as follows: figure 1 As shown, the ultrasonic transducer 3 is used to obtain the left sound beam 3A, the right sound beam 3B and the connecting mechanism 3C, wherein a certain distance is separated between the left sound beam 3A and the right sound beam 3B, and its main deficiency is: ultrasonic-acoustic After the transmission signal 7 propagates over a long distance, waveform transformation and multiple transmissions / refractions will occur, so that the law of the ultrasonic-acoustic emission signal becomes complicated, and interference signals and acoustic emission pulse signal distortion will be introduced at the receiving end, resulting in ultrasonic-acoustic emission. Acoustic emission signal interpretation is difficult, time-domain characteristics are poor, defect discrimination is difficult, it is difficult to accurately locate defects, quantitative and qualitative analysis, and detection resolution is low

Method used

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  • A Method for Obtaining Ultrasonic-Acoustic Emission Detection Signals of Composite Materials
  • A Method for Obtaining Ultrasonic-Acoustic Emission Detection Signals of Composite Materials
  • A Method for Obtaining Ultrasonic-Acoustic Emission Detection Signals of Composite Materials

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Effect test

Embodiment 1

[0045] Choose the MUT-1 detection instrument produced by AVIC Composite Materials Co., Ltd., using manual scanning, the transducer 3 adopts an asymmetrical mode, and the circular sound beam layout method. The frequency of the left sound beam is 1MHz, and the frequency of the right sound beam is 5MHz. , the bandwidth of the signal processing unit is selected as 100MHz, and the gain is selected as 12dB. A series of ultrasonic-acoustic emission detection applications are carried out on 2mm, 10mm and 20mm carbon fiber composite parts. High-quality ultrasonic-acoustic emission detection signal, based on this acoustic emission signal, the detection resolution and surface detection blind area can reach the thickness of a single composite material layup, and can detect Ф3mm, 0.13mm, 10mm and 19mm deep defects in composite material structures , and obtained a very good actual detection effect.

Embodiment 2

[0047] Choose the CUS-21J automatic scanning detection equipment produced by AVIC Composite Materials Co., Ltd., adopt automatic scanning mode, transducer 3 adopts symmetrical mode, circular sound beam layout mode, select 2MHz for left sound beam frequency, and 2MHz for right sound beam frequency , the bandwidth of the signal processing unit is selected to be 50MHz, and the gain is selected to be 18dB. A series of ultrasonic-acoustic emission detection applications have been carried out on 10mm and 50mm carbon fiber composite parts. The actual detection results show that using the patent of the present invention can obtain very clear and high-quality The ultrasonic-acoustic emission detection signal, based on the acoustic emission signal, the detection resolution and surface detection blind area can reach the thickness of a single composite material layup, and can detect Ф3mm, 0.13mm, 25mm and 49mm deep defects in the composite material structure, which is taken A very good act...

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Abstract

The invention relates to a method for acquiring ultrasonic-acoustic emission detection signals of composite materials. The ultrasonic-acoustic emission transducer adopts the zero-close distance layout of the left sound beam and the right sound beam to form an ultrasonic-acoustic emission composite sound beam, which directly receives the acoustic emission signal from the composite material part to be tested, and adopts circular and semicircular Two sound beam formation methods, symmetrical and asymmetrical, with a frequency range of 1-10MHz; the excitation unit provides ultrasonic-acoustic emission excitation signals; the receiving unit is composed of a nonlinear attenuator, an input stage, an amplification stage, etc., and the gain adjustment range is 1 ‑20dB with bandwidths of 50MHz and 100MHz. Significantly improved the time-domain characteristics and frequency-domain quality of ultrasonic-acoustic emission signals, made the defect signal discrimination rule very clear, the detection resolution was significantly improved, and the ability and detection sensitivity of ultrasonic-acoustic emission detection of composite materials were greatly improved. Available Analysis of ultrasonic-acoustic emission signal processing for different composite materials.

Description

technical field [0001] The invention belongs to the non-destructive detection technology, and relates to a method for obtaining ultrasonic-acoustic emission detection signals of composite materials in the fields of aviation, aerospace, weapons, ships, transportation, metallurgy, steel, construction and the like. Background technique [0002] The current ultrasonic-acoustic emission detection signal acquisition method is as follows: figure 1 As shown, the ultrasonic transducer 3 is used to obtain the left sound beam 3A, the right sound beam 3B and the connecting mechanism 3C, wherein a certain distance is separated between the left sound beam 3A and the right sound beam 3B, and its main deficiency is: ultrasonic-acoustic After the transmission signal 7 propagates over a long distance, waveform transformation and multiple transmissions / refractions will occur, so that the law of the ultrasonic-acoustic emission signal becomes complicated, and interference signals and acoustic e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/36
Inventor 刘菲菲刘松平
Owner AVIC COMPOSITES