Dynamic pitting intelligent evaluation method fusing acoustics and image information

Abstract

The invention discloses a dynamic pitting intelligent evaluation method fusing acoustics and image information. The method specifically comprises the step of: 1, corroding a small groove on the surface of a pipeline by utilizing electrochemical corrosion, and simulating a pitting behavior under pipeline flow noise. According to the method, an acoustic emission technology and a digital image correlation technology are combined;by means of noise reduction processing on acoustic emission signals, and the acquisition of images of three pitting corrosion phenomena including hydrogen bubble generation, film rupture and pitting pit growth in the pitting corrosion process, the acoustic emission signals are matched with the occurrence time of the pitting corrosion phenomena, three types of acoustic emission signals of hydrogen bubble generation, film rupture and corrosion pit growth are obtained; and effective parameter extraction is performed on the three types of acoustic emission signals by using acoustic emission analysis software; and thus, an artificial neural recognition network is constructed, and pitting corrosion phenomenon monitoring of equipment containing a fluid medium in the operation process can be realized, pitting corrosion acoustic emission signal identification efficiency is greatly improved, and an evaluation result is more reliable.

Description

technical field [0001] The invention relates to the technical field of pipeline damage acoustic emission monitoring, in particular to a dynamic pitting intelligent evaluation method combining acoustic and image information. Background technique [0002] The acoustic emission testing method is different from other conventional non-destructive testing methods in many aspects. Its advantages are mainly that acoustic emission is a dynamic testing method that can accept stress waves generated by internal changes in materials. The energy detected by acoustic emission comes from the tested object itself. , instead of being provided by non-destructive testing instruments like ultrasonic or ray testing methods, this characteristic determines that acoustic emission technology is a "stethoscope" for equipment health, which can monitor station pipelines with various diameters and wall thicknesses. Acoustic emission is a common The non-destructive testing method can receive three typical...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a dynamic pitting intelligent evaluation method that combines acoustic and image information to solve the above-mentioned background technology, but because the equipment is often accompanied by the medium flow in the equipment when it is pitted, many flow problems The noise signal will also be received by the acoustic emission sensor, which will interfere with the acoustic emission signal generated during the pitting process. The current acoustic emission research does not specifically analyze the extraction of the pitting signal containing flow noise.

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