CN113624150A - Pipeline concave bending strain obtaining method and device - Google Patents

Pipeline concave bending strain obtaining method and device Download PDF

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Publication number
CN113624150A
CN113624150A CN202010374605.2A CN202010374605A CN113624150A CN 113624150 A CN113624150 A CN 113624150A CN 202010374605 A CN202010374605 A CN 202010374605A CN 113624150 A CN113624150 A CN 113624150A
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pipeline
coordinates
bending strain
bottom point
determining
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CN113624150B (en
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石磊
赵亚通
奚旺
王佳楠
周立国
黄梓健
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Sinopec Dalian Petrochemical Research Institute Co ltd
China Petroleum and Chemical Corp
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China Petroleum and Chemical Corp
Sinopec Dalian Research Institute of Petroleum and Petrochemicals
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical techniques
    • G01B11/16Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical techniques
    • G01B11/002Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical techniques
    • G01B11/24Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/255Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature

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  • General Physics & Mathematics (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

The embodiment of the invention provides a method and a device for acquiring pipeline sunken bending strain, which comprises the following steps: establishing a three-dimensional view of the pipeline to be measured according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius; analyzing the three-dimensional view to determine a target depression on the outer wall of the pipeline to be tested; determining coordinates of a bottom point of the target recess and coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in a cross direction with the bottom point as a cross center; and determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point. According to the method and the device for acquiring the bending strain of the pipeline dent, provided by the embodiment of the invention, the curvature is calculated through the coordinate values of a plurality of position points on the pipeline dent, so that the circumferential bending strain and the axial bending strain of the deepest dent are acquired, and a key value is provided for the evaluation based on the strain.

Description

Pipeline concave bending strain obtaining method and device
Technical Field
The invention relates to the technical field of petroleum pipeline safety assessment, in particular to a method and a device for acquiring pipeline sunken bending strain.
Background
The pipeline dent refers to the local elastic-plastic deformation of the obvious change of the curvature of the pipeline surface caused by external impact or extrusion. During the construction and operation of the pipeline, due to the extrusion of hard objects such as rocks and the collision of excavating equipment and falling stones, the bottom and the top of the pipeline can be deformed in a concave manner to different degrees. The presence of the depression seriously affects the integrity of the pipe: firstly, fatigue failure of the sunken tube may occur due to cyclic loading; secondly, the dent brings great trouble to the cleaning and monitoring of the pipe wall condition.
The scholars at home and abroad respectively use different means such as experiments, theoretical derivation, numerical simulation and the like to research the pipeline sag. The pipeline sunken evaluation in the engineering usually takes sunken depth as criterion, sunken depth refers to the biggest reduction of sunken position pipeline diameter compared with original diameter, adopts 6% external diameter as the critical value of restoreing the pipeline that contains sunken. Studies have shown that even if the depression depth is small, the strain at the depression may not meet the standard requirements, and therefore it is inaccurate to evaluate its safety based only on the depression depth. Particularly, with the continuous increase of the grade of the oil and gas pipeline steel pipe, the toughness of the pipeline steel is better and better, and the pipeline dent evaluation based on strain is necessary. Because the likelihood of cracking is greatly increased for a dimple with higher strain, if there is a defect at the high strain point of the dimple, the defect is most likely a crack, which can cause a fracture failure to the pipe.
The pipeline strain evaluation method comprises two means, one means is based on finite element calculation, and the method has high requirement on the professional performance of evaluators and is not beneficial to engineering application. A calculation method for pipe body indentation strain is provided by domestic and foreign standards such as ASME B31.8, SY/T6996 and the like, wherein the circumferential bending strain and the axial bending strain are key evaluation parameters, the curvature radius is obtained by fitting the indentation shape by methods such as a least square method, spline interpolation and the like, and then a strain value is obtained, and the calculation process is relatively complex, so that the calculation method is not widely applied in the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for acquiring the pipe concave bending strain.
In a first aspect, an embodiment of the present invention provides a method for acquiring a pipe sag bending strain, including:
acquiring outer contour scanning data, pipeline wall thickness and pipeline radius of a pipeline to be detected, and establishing a three-dimensional view of the pipeline to be detected according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius;
analyzing the three-dimensional view to determine a target depression on the outer wall of the pipeline to be tested;
determining coordinates of a bottom point of the target recess and coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in a cross direction with the bottom point as a cross center;
and determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
Optionally, determining coordinates of a bottom point of the target recess and coordinates of four positioning points on the curved surface of the target recess includes:
processing the three-dimensional view to obtain a circumferential section, wherein the circumferential section comprises a bottom point of the target recess;
establishing a first coordinate system on the annular section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the circumferential section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to the first coordinate system.
Optionally, determining coordinates of a bottom point of the target recess and coordinates of four positioning points on the curved surface of the target recess includes:
processing the three-dimensional view to obtain an axial section, wherein the axial section comprises a bottom point of the target recess;
establishing a second coordinate system on the axial section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the axial section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to a second coordinate system.
Optionally, the determining the bending strain of the sunken position of the pipe to be measured according to the coordinates of the bottom point and the coordinates of the positioning point includes:
determining the annular bending strain according to the coordinates of the bottom point, the coordinates of two positioning points positioned on the annular section and an annular bending strain formula;
determining axial bending strain according to the coordinates of the bottom point, the coordinates of two positioning points on the axial section and an axial bending strain formula;
the hoop bending strain formula includes:
Figure BDA0002479615370000031
ε1the circumferential bending strain is adopted, and t is the wall thickness of the pipeline and is mm; khThe curvature of the annular depression is 1/mm after the pipeline is deformed; k0Is the curvature of the pipe before deformation, wherein:
Figure BDA0002479615370000032
Figure BDA0002479615370000033
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(xa,ya),(xb,yb) Coordinates, y, of two locating points on the circumferential sectionmCoordinates in the y-axis direction of the base point, R0Is the pipe radius;
the axial bending strain formula includes:
Figure BDA0002479615370000034
t is the pipe wall thickness, mm; kzThe curvature of the axial depression is 1/mm after the pipeline is deformed;
Figure BDA0002479615370000035
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(zc,yc),(zd,yd) Respectively the coordinates, y, of two locating points on the axial sectionmIs the coordinate in the y-axis direction of the base point.
In a second aspect, an embodiment of the present invention provides a device for acquiring a pipe sag bending strain, including:
the system comprises an establishing module, a data processing module and a data processing module, wherein the establishing module is used for acquiring outer contour scanning data, pipeline wall thickness and pipeline radius of a pipeline to be detected and establishing a three-dimensional view of the pipeline to be detected according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius;
the screening module is used for analyzing the three-dimensional view and determining a target depression on the outer wall of the pipeline to be tested;
the determining module is used for determining the coordinates of the bottom point of the target recess and the coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in the cross direction by taking the bottom point as a cross center;
and the acquisition module is used for determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
Optionally, the determining module is specifically configured to:
processing the three-dimensional view to obtain a circumferential section, wherein the circumferential section comprises a bottom point of the target recess;
establishing a first coordinate system on the annular section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the circumferential section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to the first coordinate system.
Optionally, the determining module is specifically configured to:
processing the three-dimensional view to obtain an axial section, wherein the axial section comprises a bottom point of the target recess;
establishing a second coordinate system on the axial section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the axial section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to a second coordinate system.
Optionally, the obtaining module is specifically configured to:
determining the annular bending strain according to the coordinates of the bottom point, the coordinates of two positioning points positioned on the annular section and an annular bending strain formula;
determining axial bending strain according to the coordinates of the bottom point, the coordinates of two positioning points on the axial section and an axial bending strain formula;
the hoop bending strain formula includes:
Figure BDA0002479615370000051
ε1for hoop bending strain, t is the pipeWall thickness, mm; khThe curvature of the annular depression is 1/mm after the pipeline is deformed; k0Is the curvature of the pipe before deformation, wherein:
Figure BDA0002479615370000052
Figure BDA0002479615370000053
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(xa,ya),(xb,yb) Coordinates, y, of two locating points on the circumferential sectionmCoordinates in the y-axis direction of the base point, R0Is the pipe radius;
the axial bending strain formula includes:
Figure BDA0002479615370000054
t is the pipe wall thickness, mm; kzThe curvature of the axial depression is 1/mm after the pipeline is deformed;
Figure BDA0002479615370000055
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(zc,yc),(zd,yd) Respectively the coordinates, y, of two locating points on the axial sectionmIs the coordinate in the y-axis direction of the base point.
In a third aspect, an embodiment of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the program to implement the steps of the above method for acquiring a pipe sag bending strain.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing the steps of the above method for acquiring pipe sag bending strain.
According to the method and the device for acquiring the bending strain of the pipeline dent, provided by the embodiment of the invention, the curvature is calculated through the coordinate values of a plurality of position points on the pipeline dent, so that the circumferential bending strain and the axial bending strain of the deepest dent are acquired, and a key value is provided for the evaluation based on the strain. Compared with the traditional method, the method has the characteristics of simplicity, rapidness, strong operability and wide application range, and is convenient for engineering application.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flowchart of an embodiment of a method for acquiring a pipe sag bending strain according to the present invention;
FIG. 2 is a schematic view of selected points within a target recess of a conduit according to the present invention;
FIG. 3 is a schematic representation of selected points on a coordinate system on a circular cross-section of the present invention;
FIG. 4 is a schematic representation of selected points on a coordinate system on an axial cross-section of the present invention;
FIG. 5 is a structural diagram of an embodiment of a device for acquiring a bending strain of a pipe in a concave shape according to the present invention;
FIG. 6 is a block diagram of an embodiment of an electronic device according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 illustrates a method for acquiring a pipe sag bending strain according to an embodiment of the present invention, including:
s11, acquiring outer contour scanning data, pipe wall thickness and pipe radius of the pipe to be detected, and establishing a three-dimensional view of the pipe to be detected according to the outer contour scanning data, the pipe wall thickness and the pipe radius;
s12, analyzing the three-dimensional view, and determining a target depression on the outer wall of the pipeline to be tested;
s13, determining coordinates of a bottom point of the target recess, and determining coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in a cross direction with the bottom point as a cross center;
and S14, determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
With respect to step S11, it should be noted that, in the embodiment of the present invention, the pipe dent refers to local elastic-plastic deformation in which the curvature of the pipe surface changes significantly due to external impact or extrusion, and for safe use of the pipe, the safety of the sunken pipe needs to be evaluated. During the safety assessment of the pipeline, data on the pipe sag bending strain is required. The bending strain at the pipeline indentation location comprises an indentation hoop bending strain and an indentation axial bending strain. Therefore, it is necessary to obtain the hoop bending strain and the axial bending strain of the pipe dent.
To obtain the hoop bending strain and axial bending strain of the pipe indentation, it is necessary to obtain the pipe geometry parameters, which may include outer profile scan data, pipe wall thickness, and pipe radius. The outer contour scanning data can be obtained by scanning the outer contour of the pipeline by using a three-dimensional laser scanner, for example. The wall thickness of the pipeline can be detected by an ultrasonic thickness gauge to obtain the wall thickness of the pipeline. A geometric caliper may be used to obtain the pipe diameter or radius, etc.
And then, establishing a three-dimensional view of the pipeline to be measured according to the scanning data of the outer contour of the pipeline and by combining the wall thickness and the radius of the pipeline.
The whole pipeline to be tested can be divided into a plurality of length sections, data acquisition and three-dimensional view establishment are carried out on each length section one by one, multi-section analysis is achieved, the data volume of each analysis processing is reduced, and the analysis speed and accuracy are improved.
With reference to step S12, it should be noted that, in the embodiment of the present invention, since the three-dimensional view is a complete representation of the pipe to be tested, if there is an inward or outward concave portion on the pipe to be tested, the pipe to be tested will also appear on the three-dimensional view. For this purpose, the resulting three-dimensional views are analyzed, all depressions are found from the three-dimensional views, and the target depressions for which the bending strain evaluation is required are determined from these depressions.
With reference to step S13, it should be noted that, in the embodiment of the present invention, a coordinate system is established on the three-dimensional view to determine the coordinates of the bottom point of the target recess, and to determine the coordinates of four positioning points on the curved surface of the target recess, where the positioning points are selected points in the cross direction with the bottom point as the intersection center. The cross direction is a vertical direction. As shown in fig. 2, which is a schematic plan view of the target recess, the circle in the figure can be regarded as the edge of the recess, the dot with the reference number 1 is the bottom point, and the dots with the reference numbers 2, 3, 4, and 5 are four positioning points.
In a further embodiment of the method according to the above embodiment, the determination of the coordinates of the base point and the coordinates of the positioning point is mainly explained as follows:
A. processing the three-dimensional view to obtain a circumferential section, wherein the circumferential section comprises a bottom point of the target recess;
establishing a first coordinate system on the annular section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the circumferential section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to the first coordinate system.
For step a, it should be noted that, as shown in fig. 3, a coordinate system is established on the three-dimensional view to obtain the central axis of the pipeline, and first, a circumferential cross-section is obtained with a bottom point of the target recess as a reference point, where the circumferential cross-section is perpendicular to the central axis of the pipeline. And then establishing a first coordinate system that the origin of coordinates is positioned on the axial line of the pipeline to be measured and the bottom point is positioned on the y axis on the annular section. And respectively selecting a positioning point on the concave contour curve on the circumferential section and positioned at two sides of the bottom point, wherein the distance between the two positioning points and the y axis is similar to the wall thickness of the pipeline, and the two positioning points are the same or different in size.
After the bottom point and the positioning points on the two sides are determined, the coordinates of each point can be determined according to the first coordinate system.
E.g., the bottom point m (x) in FIG. 3m,ym) Two points a (x) on the left and right of the bottom pointa,ya) And b (x)b,yb)。
B. Processing the three-dimensional view to obtain an axial section, wherein the axial section comprises a bottom point of the target recess;
establishing a second coordinate system on the axial section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the axial section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to a second coordinate system.
For step B, it should be noted that, as shown in fig. 4, a coordinate system is established on the three-dimensional view, and the central axis of the pipeline is obtained, and first, an axial cross section is obtained by using the bottom point of the target recess as a reference point, and the axial cross section and the central axis of the pipeline are on the same plane. And then establishing a second coordinate system on the axial section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be measured, and the bottom point is positioned on the y axis. And respectively selecting a positioning point on the concave contour curve on the axial section and positioned at two sides of the bottom point, wherein the distance between the two positioning points and the y axis is similar to the wall thickness of the pipeline, and the two positioning points are the same or different in size.
After the bottom point and the positioning points on the two sides are determined, the coordinates of each point can be determined according to the first coordinate system.
Two points c (z) on the left and right of the bottom point in FIG. 4c,yc) And d (z)d,yd)。
For step S14, it should be noted that the hoop bending strain is determined according to the coordinates of the bottom point, the coordinates of two positioning points located on the hoop section, and a hoop bending strain formula;
determining axial bending strain according to the coordinates of the bottom point, the coordinates of two positioning points on the axial section and an axial bending strain formula;
the hoop bending strain formula includes:
Figure BDA0002479615370000091
ε1the circumferential bending strain is adopted, and t is the wall thickness of the pipeline and is mm; khThe curvature of the annular depression is 1/mm after the pipeline is deformed; k0Is the curvature of the pipe before deformation, wherein:
Figure BDA0002479615370000092
Figure BDA0002479615370000093
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(xa,ya),(xb,yb) Coordinates, y, of two locating points on the circumferential sectionmCoordinates in the y-axis direction of the base point, R0Is the pipe radius;
the axial bending strain formula includes:
Figure BDA0002479615370000094
t is the pipe wall thickness, mm; kzThe curvature of the axial depression is 1/mm after the pipeline is deformed;
Figure BDA0002479615370000101
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(zc,yc),(zd,yd) Respectively the coordinates, y, of two locating points on the axial sectionmIs the coordinate in the y-axis direction of the base point.
The determination of the above bending strain is explained below by way of specific examples:
the wall thickness t of the pipeline is 5mm, and the original radius R of the pipeline0=386mm。
As shown in FIG. 3, the m-coordinate (x) of the bottom point of the depressionm,ym) (0, 146.869), point a coordinate (x)a,ya) (-2.8235, 147.03), point b coordinate (x)b,yb) (2.8235, 147.03) wherein the base point m of the pipe is the abscissa x of two points a and ba、xbThe values of (a) may be equal or different, but both should be close to the pipe wall thickness.
As in fig. 4, the c-coordinate (z) of the point of depressionc,yc) (-2.7778, 147.017), point d coordinate (z)d,yd) The abscissa of two points c and d around the bottom point m of the pipeline takes the value z (2.7778, 147.017)c、zdThe values of (a) may be equal or different, but both should be close to the pipe wall thickness.
The hoop bending strain formula:
Figure BDA0002479615370000102
in the formula, t is the wall thickness of the pipeline and is mm; khFor pipeline generationThe curvature of the ring-shaped section depression after deformation is 1/mm; k0The curvature of the pipe before deformation.
Wherein,
Figure BDA0002479615370000103
when the deformation is concave, the curvature is positive; when the deformation curve is convex, the curvature takes a negative value. According to FIG. 3, Kh takes a positive value, K0Taking a negative value.
From the data obtained, it can be calculated:
Figure BDA0002479615370000104
when the outer surface of the pipeline recess is pressed, the annular bending strain takes a negative value; the inner surface of the recess is pulled and the hoop bending strain takes a positive value. And vice versa.
Axial bending strain formula:
Figure BDA0002479615370000105
in the formula, t is the wall thickness of the pipeline and is mm; kzIs the curvature of the axial depression of the pipeline, 1/mm.
Figure BDA0002479615370000106
When the deformation is concave, the curvature is positive; when the deformation curve is convex, the curvature takes a negative value. According to FIG. 4, KzTake a positive value.
From the data obtained, it can be calculated:
Figure BDA0002479615370000111
when the outer surface of the pipeline recess is pressed, the annular bending strain takes a negative value; the inner surface of the recess is pulled and the hoop bending strain takes a positive value. And vice versa.
According to the method for acquiring the bending strain of the pipeline dent provided by the embodiment of the invention, the curvature is calculated through the coordinate values of a plurality of position points on the pipeline dent, so that the hoop bending strain and the axial bending strain of the deepest dent are acquired, and a key value is provided for the evaluation based on the strain. Compared with the traditional method, the method has the characteristics of simplicity, rapidness, strong operability and wide application range, and is convenient for engineering application.
Fig. 5 shows a schematic structural diagram of a pipeline sag bending strain obtaining apparatus provided in an embodiment of the present invention, see fig. 5, the apparatus includes a building module 21, a screening module 22, a determining module 23, and an obtaining module 24, wherein:
the building module 21 is used for obtaining outer contour scanning data, pipeline wall thickness and pipeline radius of the pipeline to be tested, and building a three-dimensional view of the pipeline to be tested according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius;
the screening module 22 is used for analyzing the three-dimensional view and determining a target depression on the outer wall of the pipeline to be tested;
the determining module 23 is configured to determine coordinates of a bottom point of the target recess, and determine coordinates of four positioning points on the curved surface of the target recess, where the positioning points are selected points in a cross direction with the bottom point as a cross center;
and the obtaining module 24 is configured to determine the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
In a further embodiment of the apparatus of the above embodiment, the determining module is specifically configured to:
processing the three-dimensional view to obtain a circumferential section, wherein the circumferential section comprises a bottom point of the target recess;
establishing a first coordinate system on the annular section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the circumferential section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to the first coordinate system.
In a further embodiment of the apparatus of the above embodiment, the determining module is specifically configured to:
processing the three-dimensional view to obtain an axial section, wherein the axial section comprises a bottom point of the target recess;
establishing a second coordinate system on the axial section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the axial section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to a second coordinate system.
In a further embodiment of the apparatus of the above embodiment, the obtaining module is specifically configured to:
determining the annular bending strain according to the coordinates of the bottom point, the coordinates of two positioning points positioned on the annular section and an annular bending strain formula;
determining axial bending strain according to the coordinates of the bottom point, the coordinates of two positioning points on the axial section and an axial bending strain formula;
the hoop bending strain formula includes:
Figure BDA0002479615370000121
ε1the circumferential bending strain is adopted, and t is the wall thickness of the pipeline and is mm; khThe curvature of the annular depression is 1/mm after the pipeline is deformed; k0Is the curvature of the pipe before deformation, wherein:
Figure BDA0002479615370000122
Figure BDA0002479615370000123
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(xa,ya),(xb,yb) Coordinates, y, of two locating points on the circumferential sectionmCoordinates in the y-axis direction of the base point, R0Is the pipe radius;
the axial bending strain formula includes:
Figure BDA0002479615370000124
t is the pipe wall thickness, mm; kzThe curvature of the axial depression is 1/mm after the pipeline is deformed;
Figure BDA0002479615370000131
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(zc,yc),(zd,yd) Respectively the coordinates, y, of two locating points on the axial sectionmIs the coordinate in the y-axis direction of the base point.
Since the principle of the apparatus according to the embodiment of the present invention is the same as that of the method according to the above embodiment, further details are not described herein for further explanation.
It should be noted that, in the embodiment of the present invention, the relevant functional module may be implemented by a hardware processor (hardware processor).
According to the pipeline sunken bending strain obtaining device provided by the embodiment of the invention, the curvature is calculated through the coordinate values of a plurality of position points on the pipeline sunken part, so that the annular bending strain and the axial bending strain of the deepest sunken part are obtained, and a key value is provided for the strain-based evaluation. Compared with the traditional method, the method has the characteristics of simplicity, rapidness, strong operability and wide application range, and is convenient for engineering application.
Fig. 6 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 6: a processor (processor)31, a communication Interface (communication Interface)32, a memory (memory)33 and a communication bus 34, wherein the processor 31, the communication Interface 32 and the memory 33 are communicated with each other via the communication bus 34. The processor 31 may call logic instructions in the memory 33 to perform the following method: acquiring outer contour scanning data, pipeline wall thickness and pipeline radius of a pipeline to be detected, and establishing a three-dimensional view of the pipeline to be detected according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius; analyzing the three-dimensional view to determine a target depression on the outer wall of the pipeline to be tested; determining coordinates of a bottom point of the target recess and coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in a cross direction with the bottom point as a cross center; and determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
In addition, the logic instructions in the memory 33 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the method provided in the foregoing embodiments when executed by a processor, and the method includes: acquiring outer contour scanning data, pipeline wall thickness and pipeline radius of a pipeline to be detected, and establishing a three-dimensional view of the pipeline to be detected according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius; analyzing the three-dimensional view to determine a target depression on the outer wall of the pipeline to be tested; determining coordinates of a bottom point of the target recess and coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in a cross direction with the bottom point as a cross center; and determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A pipeline dent bending strain acquisition method is characterized by comprising the following steps:
acquiring outer contour scanning data, pipeline wall thickness and pipeline radius of a pipeline to be detected, and establishing a three-dimensional view of the pipeline to be detected according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius;
analyzing the three-dimensional view to determine a target depression on the outer wall of the pipeline to be tested;
determining coordinates of a bottom point of the target recess and coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in a cross direction with the bottom point as a cross center;
and determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
2. The pipe dent bending strain acquisition method according to claim 1, wherein determining coordinates of a bottom point of the target dent and determining coordinates of four positioning points on the curved surface of the target dent comprise:
processing the three-dimensional view to obtain a circumferential section, wherein the circumferential section comprises a bottom point of the target recess;
establishing a first coordinate system on the annular section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the circumferential section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to the first coordinate system.
3. The pipe dent bending strain acquisition method according to claim 2, wherein determining coordinates of a bottom point of the target dent and determining coordinates of four positioning points on the curved surface of the target dent comprise:
processing the three-dimensional view to obtain an axial section, wherein the axial section comprises a bottom point of the target recess;
establishing a second coordinate system on the axial section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the axial section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to a second coordinate system.
4. The pipeline dent bending strain obtaining method according to claim 3, wherein the dent bending strain comprises a hoop bending strain and an axial bending strain, and the determining the bending strain of the dent position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point comprises:
determining the annular bending strain according to the coordinates of the bottom point, the coordinates of two positioning points positioned on the annular section and an annular bending strain formula;
determining axial bending strain according to the coordinates of the bottom point, the coordinates of two positioning points on the axial section and an axial bending strain formula;
the hoop bending strain formula includes:
Figure FDA0002479615360000021
ε1the circumferential bending strain is adopted, and t is the wall thickness of the pipeline and is mm; khThe curvature of the annular depression is 1/mm after the pipeline is deformed; k0Is the curvature of the pipe before deformation, wherein:
Figure FDA0002479615360000022
Figure FDA0002479615360000023
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(xa,ya),(xb,yb) Coordinates, y, of two locating points on the circumferential sectionmCoordinates in the y-axis direction of the base point, R0Is the pipe radius;
the axial bending strain formula includes:
Figure FDA0002479615360000024
t is the pipe wall thickness, mm; kzThe curvature of the axial depression is 1/mm after the pipeline is deformed;
Figure FDA0002479615360000025
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(zc,yc),(zd,yd) Respectively the coordinates, y, of two locating points on the axial sectionmIs the coordinate in the y-axis direction of the base point.
5. A pipe sag bending strain acquisition apparatus, comprising:
the system comprises an establishing module, a data processing module and a data processing module, wherein the establishing module is used for acquiring outer contour scanning data, pipeline wall thickness and pipeline radius of a pipeline to be detected and establishing a three-dimensional view of the pipeline to be detected according to the outer contour scanning data, the pipeline wall thickness and the pipeline radius;
the screening module is used for analyzing the three-dimensional view and determining a target depression on the outer wall of the pipeline to be tested;
the determining module is used for determining the coordinates of the bottom point of the target recess and the coordinates of four positioning points on the curved surface of the target recess, wherein the positioning points are selected points in the cross direction by taking the bottom point as a cross center;
and the acquisition module is used for determining the bending strain of the concave position of the pipeline to be measured according to the coordinates of the bottom point and the coordinates of the positioning point.
6. The pipe sag bending strain acquisition apparatus according to claim 5, wherein the determination module is specifically configured to:
processing the three-dimensional view to obtain a circumferential section, wherein the circumferential section comprises a bottom point of the target recess;
establishing a first coordinate system on the annular section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the circumferential section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to the first coordinate system.
7. The pipe sag bending strain acquisition apparatus according to claim 6, wherein the determination module is specifically configured to:
processing the three-dimensional view to obtain an axial section, wherein the axial section comprises a bottom point of the target recess;
establishing a second coordinate system on the axial section, wherein the origin of coordinates is positioned on the axial line of the pipeline to be tested, and the bottom point is positioned on the y axis;
respectively determining a positioning point on the concave contour curve on the axial section and positioned at two sides of the bottom point;
and determining the coordinates of the bottom point and the positioning point according to a second coordinate system.
8. The pipe sag bending strain acquisition device according to claim 7, wherein the acquisition module is specifically configured to:
determining the annular bending strain according to the coordinates of the bottom point, the coordinates of two positioning points positioned on the annular section and an annular bending strain formula;
determining axial bending strain according to the coordinates of the bottom point, the coordinates of two positioning points on the axial section and an axial bending strain formula;
the hoop bending strain formula includes:
Figure FDA0002479615360000041
ε1the circumferential bending strain is adopted, and t is the wall thickness of the pipeline and is mm; khThe curvature of the annular depression is 1/mm after the pipeline is deformed; k0Is the curvature of the pipe before deformation, wherein:
Figure FDA0002479615360000042
Figure FDA0002479615360000043
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(xa,ya),(xb,yb) Coordinates, y, of two locating points on the circumferential sectionmCoordinates in the y-axis direction of the base point, R0Is the pipe radius;
the axial bending strain formula includes:
Figure FDA0002479615360000044
t is the pipe wall thickness, mm; kzThe curvature of the axial depression is 1/mm after the pipeline is deformed;
Figure FDA0002479615360000045
when the deformation is concave, the curvature is positive; when the deformation curve is convex upwards, the curvature takes a negative value;
(zc,yc),(zd,yd) Respectively the coordinates, y, of two locating points on the axial sectionmIs the coordinate in the y-axis direction of the base point.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the method of acquiring pipe sag bending strain according to any one of claims 1 to 4.
10. A non-transitory computer readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, is adapted to carry out the steps of the method of acquiring pipe sag bending strain according to any one of claims 1 to 4.
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