Health detecting system for composite board structure and work method thereof

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, ...

AI Technical Summary

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 range, and accurate damage location, but the local sensitivity is low, and the identification of the type and degree of damage is not ideal; while using impedance technology, the local sensitivity is very low. High, but the detection range is limited and damage location is difficult

Therefore, when these two methods are used alone for health detection of composite panel structures, ideal results cannot be achieved.

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