Health detecting system for composite board structure and work method thereof

A technology for health detection and composite board, which is applied in measurement devices, analysis of solids using sonic/ultrasonic/infrasonic waves, and material analysis using sonic/ultrasonic/infrasonic waves. , damage location, etc.

Inactive Publication Date: 2017-09-12
DALIAN JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For traditional transducers such as piezoelectric ultrasonic transducers, the sound source is not inside the composite board under test, but is transmitted into the composite board under test by the coupling agent, which inevitably causes the loss of sound wave energy
Using ultrasonic guided wave technology for structural health detection, although the guided wave has a long propagation distance, a wide detection r

Method used

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  • Health detecting system for composite board structure and work method thereof
  • Health detecting system for composite board structure and work method thereof
  • Health detecting system for composite board structure and work method thereof

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Embodiment Construction

[0060] The present invention will be further described below with reference to the accompanying drawings.

[0061] like figure 1 As shown, in the detection method of the present invention, an arbitrary waveform function generator 1, a power amplifier 2, four ultrasonic transducers 4 based on the magnetostrictive effect, a signal conditioning circuit 5, a data acquisition card 6 and a computer 7. In addition, there are two composite boards 3 used for inspection with the same material and size, one board is used as a reference standard without any damage and no defects such as loose screws, while the other board has a defect d1 and a loose screw d2.

[0062] The size of the composite board 3 is 600mm×600mm×2mm. The excitation signal of the ultrasonic guided wave method is a sinusoidal signal of 5 to 20 cycles modulated by the Hanning window, and its center frequency is 100 to 300 kHz. The excitation signal of the machine magneto-impedance method is a sinusoidal frequency mod...

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PUM

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Abstract

The invention discloses a health detecting system for a composite board structure and a work method thereof. The system comprises a random waveform function generator, a power amplifier, an ultrasonic transducer, a signal processing circuit, a data collecting card and a computer. The invention further discloses a novel health detecting method for the composite board structure, namely an integrated ultrasonic guided-wave and machine magneto-impedance compound detecting method. The integrated ultrasonic guided-wave and machine magneto-impedance compound detecting method comprises the steps of firstly utilizing an ultrasonic guided-wave method to measure and obtain a damaged position, then utilizing a machine magneto-impedance method to measure and obtain a damage category and a damage degree, then performing correlation operation on ultrasonic guide-wave signals and machine magneto-impedance signals in a damaged state and an undamaged state of the composite board, fusing obtained correlation coefficients to obtain a new damage evaluation index and utilizing the damage evaluation index to qualitatively identify defects. The compound detecting method can effectively measure the position, category and degree of damage and make up the shortcoming that two methods cannot obtain all information of the damage in independent measurement.

Description

technical field [0001] The invention relates to a quality detection technology of a composite board, in particular to a health detection method of a composite board structure. Background technique [0002] The structural health inspection of composite panels refers to the detection of various defects in composite panels, such as air bubbles, impurities, cracks, corrosion, and loose screws, by using certain detection methods. At present, a variety of non-destructive testing methods for composite panels have been developed in the field of structural health testing, such as ultrasonic testing, radiographic testing, thermal imaging testing, and eddy current testing. [0003] Composite materials have obvious anisotropy in their organizational structure, large dispersion of material properties, and complex and diverse mechanisms of defect generation, which will lead to great obstacles in detecting defects in deeper parts. In the health detection of the composite plate structure, ...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N27/82
CPCG01N27/82G01N29/041
Inventor 王晓煜詹益郭新峰谭晓东李荣华
Owner DALIAN JIAOTONG UNIVERSITY
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