Acoustic Emission testing

Modal acoustic emission technology

Update time：2014-12-02 09:50　　　 Viewed：次

Modal acoustic emission is a useful instrument in acoustic emission signal processing technology. It located in acoustic emission source, composite material damage source identification, fatigue crack initiation and propagation of acoustic emission monitoring acoustic emission damage evaluation of engineering practice and the calendar to get a number of applications.

Modal acoustic emission (MAE) in its essence is a kind of the AE signal processing technology based on waveform analysis. Although made a large simplify the processing for the research object and the technology itself is still in perfect, but as a result of focusing on the AE signal waveform associated with the physical process of AE, so, it has shown strong vitality. MAE theory of the fundamental insight is that for slab structure is widely used in engineering, because the thickness is much smaller than the wavelength of the sound waves, AE source main drive up the extension wave in the plate (the lowest order symmetrical wave S0), the flexural (A0) minimum order antisymmetric wave (SH) and horizontal shear wave three patterns of sound waves. Plate plane (IP) source mainly produce expansion wave, and the outofplane (OOP) source is mainly produce the flexural, two kinds of sound source is likely to produce SH wave, there is no such a large amount of the AE source or noise characteristics. MAE technology itself than the parameter analysis is complex, but the result is that AE signal processing method is simplified. This based on the analysis of the AE source physical mechanism can greatly help us to distinguish the AE signal and noise signal, thus, in many engineering applications, it can be a very effective method of AE signal processing. (Editor：admin)

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