Positioning method for acoustic emission structure based on barycentric coordinates
A technology of center of gravity coordinates and structural damage, applied in the direction of material analysis, instrumentation, and analysis of materials using acoustic wave emission technology
Active Publication Date: 2018-12-25
SHANDONG JIANZHU UNIV
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However, its shortcomings are also obvious. When performing surface positioning, it can only calculate the positioning inside the triangle composed of three sensors.
That is to say, when the damage point is located outside the triangle, this positioning method is powerless
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[0020] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0021] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0022] An embodiment of the present invention provides an acoustic emission structure damage location method bas...
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The invention discloses a damage positioning method for an acoustic emission structure based on barycentric coordinates. The positioning method comprises the following steps of: obtaining an acousticemission signal by performing an impact test on a material in advance; using a first peak point of a waveform of an acoustic emission wave as an arrival time t of the acoustic emission signal; obtaining velocity distribution rule of the acoustic emission wave in the whole structure by measuring a distance and the arrival time t from a detected structure damage point to a sensor; arranging three sensors above the structure; collecting an acoustic emission signal of an unknown point; obtaining an arrival time of the acoustic emission signal of the unknown point; reusing the velocity distributionrule of the acoustic emission wave and the arrival time of the acoustic emission signal to obtain distances from the acoustic emission wave to the three sensors; and substituting the distances into the barycentric positioning algorithm program so as to obtain the two-dimensional plane coordinates of the structural damage points. According to the positioning method for the acoustic emission structure damage based on the barycentric coordinates, the position of the damage point in the structure can be accurately calculated without being restricted by the position of the sensor, and the requirement of the real environment condition can be better satisfied.
Description
technical field [0001] The invention relates to an acoustic emission structural damage location method based on center of gravity coordinates, which belongs to the field of acoustic emission detection, and in particular to a method for locating damaged points of a detected structure by using an acoustic emission detection technology and a location algorithm based on center of gravity coordinates. Background technique [0002] In the actual application of engineering, there will be situations such as impact, structural overload, and material overheating and overcooling. These accidents will lead to cracks and voids in the material structure of the project, and even cause structural breakage and fragmentation in severe cases, which seriously affects the safety of people's production and life. It can be seen that real-time monitoring and locating the location of the damage point is an engineering safety issue. top priority. [0003] Acoustic emission technology is a non-destru...
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Login to View More IPC IPC(8): G01N29/14
CPCG01N29/14G01N2291/103
Inventor 孙荣耀庞丹丹
Owner SHANDONG JIANZHU UNIV