Method for positioning acoustic emission source based on four-sensor array
A sensor array and acoustic emission source technology, which is applied in the direction of material analysis using acoustic emission technology, can solve problems such as error, positioning algorithm failure, and positioning algorithm that does not consider sensor array obtuse triangles, etc.
Active Publication Date: 2019-01-11
SHANDONG JIANZHU UNIV
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[0003] The center-of-gravity coordinate positioning method based on three sensor arrays can be used when the number of sensor positions is high, but it still has two problems to be solved: one is that it is very accurate when there is no error interference, but in In our practical application, it is inevitable that errors will be introduced
In this case, the positioning method based on three sensor arrays will misjudgment the area of the positioning point, resulting in a large error in the final positioning result; second, the positioning algorithm does not consider the sensor array as an obtuse triangle. When the triangle is an obtuse triangle, the positioning algorithm fails and needs further modification and improvement
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[0025] 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.
[0026] 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.
[0027] An acoustic emission positioning method based on a four-sensor array of the present invention includes: ...
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The invention relates to a method for positioning an acoustic emission source based on a four-sensor array. The method comprises the following steps that an impact test is carried out on a material, so that an acoustic emission signal and an acoustic emission wave speed distribution rule are obtained; four sensors are arranged on the structure, acoustic emission signals at unknown points are collected, and the arrival time and the distance of the acoustic emission signal at the unknown point are obtained; and any three sensors in the four sensors form a sensor group, and the distance of each sensor group is substituted into a gravity center positioning algorithm program, the points which generate erroneous judgement are removed, the residual points are averaged, and two-dimensional plane coordinates of structural damage points are obtained. According to the method, the application range of positioning a sound source point by utilizing the gravity center coordinate algorithm is expanded, the position of the sound source point can still be calculated by the gravity center coordinate algorithm under a condition that the sensor group is an obtuse triangle, and the precision of positioning the sound source is improved, so that the position of the sound source point can be still accurately judged when the sound source point is on a critical line of an area, and thus a problem that the positioning precision cannot be guaranteed under an error situation is avoided.
Description
technical field [0001] The invention provides a method for locating an acoustic emission source based on a four-sensor array, which belongs to the field of acoustic emission locating, and in particular relates to a method for locating a certain sound source point in a plane by using a four-sensor array and an acoustic emission waveform. Background technique [0002] At present, the positioning technology using acoustic emission has been applied more and more in various projects. When it is necessary to check the damage point of the material in the project, it is often necessary to use acoustic emission technology to monitor and locate it in real time. However, the traditional plane positioning method can only be positioned inside the triangle composed of three sensors. When the actual project requires a high number of sensors, the traditional positioning method will fail. Therefore, a localization method based on three sensor arrays came into being. [0003] The center-of-...
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IPC IPC(8): G01N29/14
CPCG01N29/14
Inventor 庞丹丹孙荣耀
Owner SHANDONG JIANZHU UNIV