SU1411661A1 - Method of determining location of defect on surface of arbitrary shape - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to control welded metal products by acoustic emission signals (AE). The aim of the invention is to simplify control by eliminating analytical calculations. The moving receiver 3 of the AE signals is moved along the controlled plane around the fixed receiver 2. Two positions of the moving receiver 3 are determined at which the signals of the AE are equal in amplitude and the difference in arrival times of the signals is zero. The intersection of the perpendiculars reconstructed from the centers of the segments connecting the fixed receiver with two movable positions determines the location of the defect that is the source of the signals .A.E. 1 il. cl

Description

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The invention relates to the field of non-destructive testing of materials and products and can be used to control welded metal products by acoustic emission signals (AE).

The aim of the invention is to simplify control by eliminating analytical calculations.

The drawing shows the real-position diagram of the mobile receiver 3, in which the amplitudes of the AE signals are equal, and the difference in the time of their arrival is zero. A second perpendicular is conducted to the segment connecting receivers 2 and 3, reconstructed from the middle of this segment. The location of the defect that is the source of the AE signals is determined at the point of intersection of the perpendiculars.

Thus, the proposed method of positioning the method of determining the location

defect on the surface of arbitrary shape, it can simplify the control procedure due to

On the surface of the monitored product for reducing the number of receivers of signals 1, there is a fixed receiver 2 of signals-AE, necessary for determining the coordinates of the AE and a mobile receiver 3 of the AE signals (the mobile receiver 3 is shown in two positions).

The method for determining the location of a defect on a surface of an arbitrary shape is implemented as follows.

On the controlled surface of the product 1 install a fixed receiver 2

nat sources of AE signals on the plane, and exclude analytical calculations,

Claims (1)

Invention Formula A method for determining the location of a defect on a surface of arbitrary shape, which means that, at the control of AE signals, at a given distance R from jn of the surface, a group of a fixed mobile receiver 2 is placed at an arbitrary point of a circle of radius R and placed by two receivers 2 and 3 , measure the amplitudes of the received signals at each receiver 2 and 3 and the differences in arrival times of the AE signals to these receivers 2 and 3. Move the mobile receiver 3 around the fixed receiver 2 around the circumference radius R and choose such a location at which the AE signals received Acoustic emission signal collectors, receive signals emitted by a developing defect, measure differences in arrival times of signals at receivers, and the ratio of signal amplitudes and determine the location of the defect using the measured 25 parameters, characterized in that, in order to simplify control, the first receiver is fixed, moved the second receiver on the controlled surface around the first with a given radius and receiver 2 and 3, are equal in amplitude, 30 take two of its location, in which the difference of their arrival is ulyu. The first signals coming to the receivers. ; water is perpendicular to the monitored surface; 1 is reconstructed from the center i of the segment of length R connecting the first fixed receiver 2 to the second mobile receiver 3. Again the moving receiver 3 starts to move around the fixed receiver 2 and t second 35 equal in amplitude, and the difference in the time of arrival of signals is zero, and the location of the defect is determined at the point of intersection of the perpendiculars reconstructed from the segment centers connecting the first receiver with two defined positions of the second receiver. the position of the rolling receiver 3, in which the amplitudes of the AE signals are equal, and the difference in the time of their arrival is zero. A second perpendicular is conducted to the segment connecting receivers 2 and 3, reconstructed from the middle of this segment. The location of the defect that is the source of the AE signals is determined at the point of intersection of the perpendiculars. Thus, the proposed method of reducing the number of AE signal receivers necessary for determining the nat sources of AE signals on the plane, and exclude analytical calculations, Invention Formula A method for determining the location of a defect on an arbitrary surface, which consists in determining a group of acoustic emission signal receivers on a controlled surface, receiving signals emitted by a developing defect, measuring the difference between the arrival times of signals at the receivers and the signal amplitude ratio, and determining the location of the measured parameters defect, characterized in that, in order to simplify the control, the first receiver is fixedly mounted, the second receiver is moved along the controlled overhnosti around a first fixed radius and two of its selected location in koto- ryh signals arriving at receivers. equal in amplitude, and the difference in the time of arrival of signals is zero, and the location of the defect is determined at the point of intersection of the perpendiculars reconstructed from the segment centers connecting the first receiver with two defined positions of the second receiver.