CN116608778A - Strain assessment method, system and storage medium at vertex of pipeline depression - Google Patents
Strain assessment method, system and storage medium at vertex of pipeline depression Download PDFInfo
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- 238000005452 bending Methods 0.000 claims description 66
- 238000012545 processing Methods 0.000 claims description 9
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention discloses a strain evaluation method, a system and a storage medium at a concave vertex of a pipeline, comprising the following steps: determining a concave vertex of a concave region from a three-dimensional morphology image of a target pipeline comprising the concave region; determining a target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the axial direction of the concave pipeline, and determining a target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the circumferential direction of the concave pipeline; and obtaining a target strain value of the target pipeline at the concave vertex based on the target axial curvature radius, the target circumferential curvature radius, the concave depth and the concave length of the concave region. According to the invention, through measurement and calculation of the three-dimensional morphology image of the pipeline concave region, the safety evaluation and verification of the strain at the vertex of the pipeline concave region are realized, and the improvement of the integrity management level of the pipeline is facilitated.
Description
Technical Field
The invention relates to the field of pipeline safety management, in particular to a strain evaluation method, a system and a storage medium at a concave vertex of a pipeline.
Background
In the long-term service process of the buried oil gas pipeline, the buried oil gas pipeline is inevitably influenced by geological movement, local soil settlement and the like, so that the pipeline is locally deformed to form a pipeline dent. Pipeline recessing can adversely affect pipeline integrity, and in an integrity management process, it is desirable to evaluate pipeline recessing for integrity, typically using both a recession depth-based and a recession strain-based evaluation method. Wherein, based on the evaluation of the dent strain, a more accurate evaluation method can evaluate the residual strength of the pipeline containing the dent.
However, it is currently difficult to directly measure and evaluate strain at the apex of a pipe recess for a pipe recess excavation site, and to achieve integrity management of the pipe. Accordingly, there is a need to provide a solution to the above-mentioned problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a strain evaluation method, a system and a storage medium for a pipeline concave vertex.
The technical scheme of the strain evaluation method at the concave vertex of the pipeline is as follows:
determining a concave vertex of a concave region from a three-dimensional morphology image of a target pipeline comprising the concave region;
determining a target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the axial direction of the concave pipeline, and determining a target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the circumferential direction of the concave pipeline;
and obtaining a target strain value of the target pipeline at the concave vertex based on the target axial curvature radius, the target circumferential curvature radius, the concave depth and the concave length of the concave region.
The strain evaluation method at the concave vertex of the pipeline has the following beneficial effects:
according to the method, through measurement and calculation of the three-dimensional morphology image of the pipeline concave region, safety evaluation and verification of strain at the vertex of the pipeline concave region are realized, and the improvement of the integrity management level of the pipeline is facilitated.
Based on the scheme, the strain evaluation method at the concave vertex of the pipeline can be improved as follows.
Further, the method further comprises the following steps:
and carrying out concave profile scanning on the concave area in the target pipeline by using a laser three-dimensional scanner to obtain the three-dimensional morphology image.
Further, the step of determining a target axial radius of curvature at the concave vertex according to the concave depth direction at the concave vertex and the concave pipeline axial direction comprises the steps of:
constructing a three-dimensional Cartesian coordinate system by taking the concave vertex as an origin, the standard pipeline axial direction as an X axis, the standard pipeline circumferential direction as a Y axis and the pipeline depth direction as a Z axis, and mapping the three-dimensional morphology image into the three-dimensional Cartesian coordinate system to obtain a straight line where the concave pipeline at the concave vertex is axially located, a straight line where the concave pipeline circumferential direction is located and a straight line where the concave depth direction is located;
constructing a first plane comprising a straight line in which the concave depth direction at a concave vertex is positioned and a straight line in which the concave pipeline is axially positioned in the three-dimensional Cartesian coordinate system, and determining an intersection line of the first plane and the three-dimensional morphology image as a concave axial contour line;
constructing a plurality of first circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the first circumscribed circles meeting a first preset condition as the target axial curvature radiuses from all the first circumscribed circles;
the step of determining the target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the concave pipeline circumferential direction comprises the following steps:
constructing a second plane comprising a straight line in which the concave depth direction at the concave vertex is located and a straight line in which the concave pipeline is located in the annular direction in the three-dimensional Cartesian coordinate system, and determining an intersection line of the second plane and the three-dimensional morphology image as a concave annular contour line;
and constructing a plurality of second circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the second circumscribed circles meeting second preset conditions as the target circumferential curvature radiuses from all the second circumscribed circles.
Further, the step of obtaining a target strain value for the target pipe at the apex of the recess based on the target axial radius of curvature, the target circumferential radius of curvature, the recess depth and the recess length of the recess region, comprises:
substituting the target circumferential curvature radius into a circumferential bending strain calculation formula to obtain a circumferential bending strain value at the concave vertex; the calculation formula of the circumferential bending strain is as follows:ε 1 for the circumferential bending strain value, t is the wall thickness of the target pipeline, R 0 R is the radius of the pipeline when the target pipeline is not deformed 2 A radius of curvature for the target circumferential direction;
substituting the target axial curvature radius into an axial bending strain calculation formula to obtain an axial bending strain value at the concave vertex; wherein, the axial bending strain calculation formula is:ε 2 for the axial bending strain value, R 1 Is the target axial radius of curvature;
substituting the concave depth and the concave length into an axial film strain calculation formula to obtain an axial film strain value at the vertex of the concave; wherein, the axial film strain calculation formula is:d is the depth of the recess, L is the length of the recess, ε 3 -the axial film strain value;
substituting the annular bending strain value, the axial bending strain value and the axial film strain value into a total strain calculation formula at the concave vertex to obtain the target strain value; wherein, the total strain calculation formula at the concave vertex is:epsilon is the target strain value.
Further, the method further comprises the following steps:
and when the target strain value is larger than a preset strain value, judging that the target pipeline has safety risk and outputting early warning information.
The technical scheme of the strain evaluation system at the concave vertex of the pipeline is as follows:
the system comprises an acquisition module, a processing module and an evaluation module;
the acquisition module is used for: determining a concave vertex of a concave region from a three-dimensional morphology image of a target pipeline comprising the concave region;
the processing module is used for: determining a target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the axial direction of the concave pipeline, and determining a target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the circumferential direction of the concave pipeline;
the evaluation module is used for: and obtaining a target strain value of the target pipeline at the concave vertex based on the target axial curvature radius, the target circumferential curvature radius, the concave depth and the concave length of the concave region.
The strain evaluation system at the concave vertex of the pipeline has the following beneficial effects:
the system of the invention realizes the safety evaluation and verification of the strain at the vertex of the pipeline depression by measuring and calculating the three-dimensional morphology image of the pipeline depression area, and is beneficial to improving the integrity management level of the pipeline.
Based on the above scheme, the strain evaluation system at the concave vertex of the pipeline can be improved as follows.
Further, the method further comprises the following steps: an acquisition module;
the acquisition module is used for: and carrying out concave profile scanning on the concave area in the target pipeline by using a laser three-dimensional scanner to obtain the three-dimensional morphology image.
Further, the processing module is specifically configured to:
constructing a three-dimensional Cartesian coordinate system by taking the concave vertex as an origin, the standard pipeline axial direction as an X axis, the standard pipeline circumferential direction as a Y axis and the pipeline depth direction as a Z axis, and mapping the three-dimensional morphology image into the three-dimensional Cartesian coordinate system to obtain a straight line where the concave pipeline at the concave vertex is axially located, a straight line where the concave pipeline circumferential direction is located and a straight line where the concave depth direction is located;
constructing a first plane comprising a straight line in which the concave depth direction at a concave vertex is positioned and a straight line in which the concave pipeline is axially positioned in the three-dimensional Cartesian coordinate system, and determining an intersection line of the first plane and the three-dimensional morphology image as a concave axial contour line;
constructing a plurality of first circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the first circumscribed circles meeting a first preset condition as the target axial curvature radiuses from all the first circumscribed circles;
constructing a second plane comprising a straight line in which the concave depth direction at the concave vertex is located and a straight line in which the concave pipeline is located in the annular direction in the three-dimensional Cartesian coordinate system, and determining an intersection line of the second plane and the three-dimensional morphology image as a concave annular contour line;
and constructing a plurality of second circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the second circumscribed circles meeting second preset conditions as the target circumferential curvature radiuses from all the second circumscribed circles.
Further, the evaluation module is specifically configured to:
substituting the target circumferential curvature radius into a circumferential bending strain calculation formula to obtain a circumferential bending strain value at the concave vertex; the calculation formula of the circumferential bending strain is as follows:ε 1 for the circumferential bending strain value, t is the wall thickness of the target pipeline, R 0 R is the radius of the pipeline when the target pipeline is not deformed 2 A radius of curvature for the target circumferential direction;
substituting the target axial curvature radius into an axial bending strain calculation formula to obtain an axial bending strain value at the concave vertex; wherein, the axial bending strain calculation formula is:ε 2 for the axial bending strain value, R 1 Is the target axial radius of curvature;
substituting the concave depth and the concave length into an axial film strain calculation formula to obtain an axial film strain value at the vertex of the concave; wherein, the axial film strain calculation formula is:d is the depth of the recess, L is the length of the recess, ε 3 -the axial film strain value;
setting the circumferential bending strain value and the axial bending strainSubstituting the value and the axial film strain value into a total strain calculation formula at the concave vertex to obtain the target strain value; wherein, the total strain calculation formula at the concave vertex is:epsilon is the target strain value.
The technical scheme of the storage medium is as follows:
the storage medium has instructions stored therein which, when read by a computer, cause the computer to perform the steps of a method of strain assessment at a pipe dished apex as in the present invention.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a method for evaluating strain at a vertex of a pipe depression according to the present invention;
fig. 2 is a schematic diagram of a rectangular coordinate system in an embodiment of a strain evaluation method at a concave vertex of a pipe according to the present invention;
FIG. 3 is a schematic diagram of a target pipeline in an embodiment of a method for evaluating strain at a concave vertex of a pipeline according to the present invention;
FIG. 4 is a schematic diagram of a concave axial contour line in an embodiment of a method for evaluating strain at a concave apex of a pipe according to the present invention;
fig. 5 is a schematic diagram of a principle of a concave circumferential contour line in an embodiment of a strain evaluation method at a concave vertex of a pipe according to the present invention;
fig. 6 is a schematic structural diagram of an embodiment of a strain evaluation system at the vertex of a pipe depression according to the present invention.
Detailed Description
Fig. 1 is a schematic flow chart of an embodiment of a method for evaluating strain at a vertex of a pipe depression according to the present invention. As shown in fig. 1, the method comprises the following steps:
step 110: determining the concave peaks of the concave areas from the three-dimensional morphology image of the target pipeline containing the concave areas.
Wherein, (1) the target pipeline is: a pipe containing a defective area. (2) The three-dimensional topography image comprises a concave profile corresponding to a concave region in the target conduit. (3) The concave vertex is positioned at the position of the deepest concave deformation in the concave area of the target pipeline.
Step 120: and determining a target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the concave pipeline axial direction, and determining a target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the concave pipeline circumferential direction.
Wherein, (1) the target axial radius of curvature is: axial radius of curvature at the apex of the recess. (2) The target circumferential curvature radius is: the circumferential radius of curvature at the apex of the depression. (3) The axial direction of the concave pipeline, the circumferential direction of the concave pipeline and the depth direction of the concave are three vector directions of the target pipeline at the vertex of the concave.
Step 130: and obtaining a target strain value of the target pipeline at the concave vertex based on the target axial curvature radius, the target circumferential curvature radius, the concave depth and the concave length of the concave region.
Wherein, (1) the target strain value is: total strain value of the target pipe at the apex of the recess. (2) The recess depth and recess length can be measured.
Preferably, the method further comprises:
and carrying out concave profile scanning on the concave area in the target pipeline by using a laser three-dimensional scanner to obtain the three-dimensional morphology image.
It should be noted that, the laser three-dimensional scanner is an existing device, and the specific functions and effects of the laser three-dimensional scanner are not described herein.
Preferably, the step of determining the target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the concave pipeline axial direction comprises the following steps:
and constructing a three-dimensional Cartesian coordinate system by taking the concave vertex as an original point, the standard pipeline axial direction as an X axis, the standard pipeline circumferential direction as a Y axis and the pipeline depth direction as a Z axis, and mapping the three-dimensional morphology image into the three-dimensional Cartesian coordinate system to obtain a straight line where the concave pipeline axial direction is located at the concave vertex, a straight line where the concave pipeline circumferential direction is located and a straight line where the concave depth direction is located.
It should be noted that, (1) as shown in fig. 2, the three-dimensional cartesian coordinate system constructed in this embodiment is constructed based on the pipe axial direction, the pipe circumferential direction and the pipe depth direction of the standard pipe (the pipe without the recess), so that the straight line where the recess pipe axial direction is located at the apex of the recess, the straight line where the recess pipe circumferential direction is located and the straight line where the recess depth direction is located are determined in the coordinate system according to the actual recess condition of the target pipe. (2) The specific process of mapping the three-dimensional morphology image to the three-dimensional Cartesian coordinate system comprises the following steps: and importing the three-dimensional morphology image into three-dimensional drawing software to obtain specific coordinate data of the three-dimensional morphology image in a three-dimensional Cartesian coordinate system.
And constructing a first plane comprising a straight line in which the concave depth direction at the concave vertex is positioned and a straight line in which the concave pipeline is axially positioned in the three-dimensional Cartesian coordinate system, and determining an intersection line of the first plane and the three-dimensional morphology image as a concave axial contour line.
Wherein, (1) the first plane is: in a three-dimensional cartesian coordinate system, a plane is constructed from two vector directions (a straight line in which the depression depth direction is located and a straight line in which the depression pipe axis is located) at the apex of the depression. (2) The axial contour line of the concave is as follows: and intersecting lines between the first plane and the three-dimensional morphology image in the three-dimensional Cartesian coordinate system.
And constructing a plurality of first circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the first circumscribed circles meeting a first preset condition as the target axial curvature radiuses from all the first circumscribed circles.
The first preset condition is as follows: the first circumscribed circle of the concave axial contour lines which do not cover the two sides of the concave vertex in the first queue corresponds to the last first circumscribed circle. The first queue is obtained by arranging all the radii of the first circumscribed circles from small to large.
It should be noted that, the radii of any two adjacent first circumscribing circles in the first queue differ by 1mm, and the first circumscribing circles can also be set according to actual requirements.
The step of determining the target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the concave pipeline circumferential direction comprises the following steps:
and constructing a second plane comprising a straight line in which the concave depth direction at the concave vertex is positioned and a straight line in which the concave pipeline is positioned in the annular direction in the three-dimensional Cartesian coordinate system, and determining an intersection line of the second plane and the three-dimensional morphology image as a concave annular contour line.
Wherein (1) the second plane is: in a three-dimensional Cartesian coordinate system, a plane is constructed from two vector directions at the apex of the depression (a straight line in which the depression depth direction is located and a straight line in which the depression pipe is circumferentially located). (2) The axial contour line of the concave is as follows: and intersecting lines between the second plane and the three-dimensional morphology image in the three-dimensional Cartesian coordinate system.
And constructing a plurality of second circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the second circumscribed circles meeting second preset conditions as the target circumferential curvature radiuses from all the second circumscribed circles.
The second preset condition is as follows: the first second circumscribed circle which does not cover the concave annular contour lines at the two sides of the concave vertex in the second queue corresponds to the last second circumscribed circle. The second queue is obtained by arranging the radii of all the second outer circles from small to large.
It should be noted that, the radii of any two adjacent second circumscribed circles in the second queue differ by 1mm, and can also be set according to actual requirements.
Preferably, step 130 includes:
step 131: substituting the target circumferential curvature radius into a circumferential bending strain calculation formula to obtain a circumferential bending strain value at the vertex of the recess.
The calculation formula of the circumferential bending strain is as follows:ε 1 for the circumferential bending strain value, t is the wall thickness of the target pipeline, R 0 R is the radius of the pipeline when the target pipeline is not deformed 2 For the target circumferential radius of curvature.
Step 132: substituting the target axial curvature radius into an axial bending strain calculation formula to obtain an axial bending strain value at the concave vertex.
Wherein, the axial bending strain calculation formula is:ε 2 for the axial bending strain value, R 1 Is the target axial radius of curvature.
Step 133: substituting the concave depth and the concave length into an axial film strain calculation formula to obtain an axial film strain value at the vertex of the concave.
The axial film strain calculation formula is as follows:d is the depth of the recess, L is the length of the recess, ε 3 Is the axial film strain value.
Step 134: substituting the annular bending strain value, the axial bending strain value and the axial film strain value into a total strain calculation formula at the concave vertex to obtain the target strain value.
Wherein, the total strain calculation formula at the concave vertex is:
epsilon is the target strain value.
Preferably, the method further comprises:
and when the target strain value is larger than a preset strain value, judging that the target pipeline has safety risk and outputting early warning information.
Wherein, (1) the preset strain value is: the acceptable value of the target pipe dent strain is set according to the actual requirement of the target pipe, and the specific value is not limited. When the target strain value is larger than a preset strain value, judging that the target pipeline has safety risk; and when the target strain value is smaller than or equal to the preset strain value, judging that the target pipeline has no safety risk. (2) The early warning information comprises: text information, voice prompt, etc., are not limited herein.
In order to better explain the technical solution of the present embodiment, the following examples are used for description. Specifically:
as shown in fig. 3, the target pipe is a pipe having a diameter of 1016mm, a wall thickness of 14.6mm, a recess depth d=56 mm, and a recess length l=180 mm, which includes a recess region having a single vertex.
(1) And carrying out concave profile scanning on a concave region in the target pipeline by using a laser three-dimensional scanner to obtain a three-dimensional morphology image, and storing the three-dimensional morphology image as a stl data format.
(2) And opening the stl file by adopting three-dimensional drawing software, and determining the deepest position of the concave deformation in the target pipeline as a concave vertex from the three-dimensional morphology image. The concave vertex is taken as an origin point, and three vector directions of the target pipeline are marked by a three-dimensional Cartesian coordinate system: the axial direction of the concave pipeline, the annular direction of the concave pipeline and the depth direction of the concave.
(3) And constructing a first plane according to the straight line in the depth direction of the recess and the straight line in the axial direction of the recess pipeline, and determining the intersection line of the first plane and the three-dimensional morphology image as a recess axial contour line. As shown in fig. 4, for the axial contour of the depression, a plurality of first circumscribed circles of different sizes and passing through the apex of the depression are drawn. From all the first circumscribing circles, determining the radius of the first circumscribing circle meeting the first preset condition as the target axial curvature radius R 1 ＝150mm。
(4) Constructing a second plane according to the straight line of the concave depth direction and the straight line of the concave pipeline ring direction, and determining the intersection line of the second plane and the three-dimensional morphology image as a concave ringTo the contour line. As shown in fig. 5, a plurality of second outer circles of different sizes and passing through the vertices of the recess are drawn for the circumferential contour of the recess. From all the second circumscribed circles, determining the radius of the second circumscribed circle meeting a second preset condition as the target circumferential curvature radius R 2 ＝320mm。
(5) Substituting the target circumferential curvature radius into a circumferential bending strain calculation formula to obtain a circumferential bending strain value at the concave vertex, namely:
substituting the target axial curvature radius into an axial bending strain calculation formula to obtain an axial bending strain value at the concave vertex, namely:
substituting the recess depth and the recess length into an axial film strain calculation formula to obtain an axial film strain value at the vertex of the recess, namely:
substituting the annular bending strain value, the axial bending strain value and the axial film strain value into a total strain calculation formula at the concave vertex to obtain the target strain value, namely:
(6) taking SY/T6996-2014 as an example, the preset strain value of the target pipeline is set to epsilon c =0.06, and the strain ε > ε at the peak of the depression c Indicating that the dent strain exceeds an acceptable range, namely that the target pipeline has safety risk and outputting early warning information.
According to the technical scheme, through measurement and calculation of the three-dimensional morphology image of the pipeline concave region, safety evaluation and verification of strain at the vertex of the pipeline concave region are achieved, and improvement of the integrity management level of the pipeline is facilitated.
Fig. 6 is a schematic structural diagram of an embodiment of a strain evaluation system at the vertex of a pipe depression according to the present invention. As shown in fig. 6, the system 200 includes: an acquisition module 210, a processing module 220, and an evaluation module 230.
The obtaining module 210 is configured to: determining a concave vertex of a concave region from a three-dimensional morphology image of a target pipeline comprising the concave region;
the processing module 220 is configured to: determining a target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the axial direction of the concave pipeline, and determining a target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the circumferential direction of the concave pipeline;
the evaluation module 230 is configured to: and obtaining a target strain value of the target pipeline at the concave vertex based on the target axial curvature radius, the target circumferential curvature radius, the concave depth and the concave length of the concave region.
Preferably, the method further comprises: an acquisition module;
the acquisition module is used for: and carrying out concave profile scanning on the concave area in the target pipeline by using a laser three-dimensional scanner to obtain the three-dimensional morphology image.
Preferably, the processing module 220 is specifically configured to:
constructing a three-dimensional Cartesian coordinate system by taking the concave vertex as an origin, the standard pipeline axial direction as an X axis, the standard pipeline circumferential direction as a Y axis and the pipeline depth direction as a Z axis, and mapping the three-dimensional morphology image into the three-dimensional Cartesian coordinate system to obtain a straight line where the concave pipeline at the concave vertex is axially located, a straight line where the concave pipeline circumferential direction is located and a straight line where the concave depth direction is located;
constructing a first plane comprising a straight line in which the concave depth direction at a concave vertex is positioned and a straight line in which the concave pipeline is axially positioned in the three-dimensional Cartesian coordinate system, and determining an intersection line of the first plane and the three-dimensional morphology image as a concave axial contour line;
constructing a plurality of first circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the first circumscribed circles meeting a first preset condition as the target axial curvature radiuses from all the first circumscribed circles;
constructing a second plane comprising a straight line in which the concave depth direction at the concave vertex is located and a straight line in which the concave pipeline is located in the annular direction in the three-dimensional Cartesian coordinate system, and determining an intersection line of the second plane and the three-dimensional morphology image as a concave annular contour line;
and constructing a plurality of second circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the second circumscribed circles meeting second preset conditions as the target circumferential curvature radiuses from all the second circumscribed circles.
Preferably, the evaluation module 230 is specifically configured to:
substituting the target circumferential curvature radius into a circumferential bending strain calculation formula to obtain a circumferential bending strain value at the concave vertex; the calculation formula of the circumferential bending strain is as follows:ε 1 for the circumferential bending strain value, t is the wall thickness of the target pipeline, R 0 R is the radius of the pipeline when the target pipeline is not deformed 2 A radius of curvature for the target circumferential direction;
substituting the target axial curvature radius into an axial bending strain calculation formula to obtain an axial bending strain value at the concave vertex; wherein, the axial bending strain calculation formula is:ε 2 for the axial bending strain value, R 1 Is the target axial radius of curvature;
substituting the concave depth and the concave length into an axial film strain calculation formula to obtain an axial film strain value at the vertex of the concave; wherein, the axial film strain calculation formula is:d is the depth of the recess, L is the length of the recess, ε 3 -the axial film strain value;
substituting the annular bending strain value, the axial bending strain value and the axial film strain value into a total strain calculation formula at the concave vertex to obtain the target strain value; wherein, the total strain calculation formula at the concave vertex is:epsilon is the target strain value.
According to the technical scheme, through measurement and calculation of the three-dimensional morphology image of the pipeline concave region, safety evaluation and verification of strain at the vertex of the pipeline concave region are achieved, and improvement of the integrity management level of the pipeline is facilitated.
The above steps for implementing the corresponding functions by the parameters and the modules in the embodiment of the strain estimation system 200 at the vertex of the pipe depression provided in the present invention may refer to the parameters and the steps in the embodiment of the strain estimation method at the vertex of the pipe depression provided in the above description, and are not described herein.
The storage medium provided by the embodiment of the invention comprises: the storage medium stores instructions that, when read by a computer, cause the computer to perform steps of a method for evaluating strain at a vertex of a pipe depression, and specifically, reference may be made to the parameters and steps provided in the embodiments of a method for evaluating strain at a vertex of a pipe depression, which are not described herein.
Computer storage media such as: flash disk, mobile hard disk, etc.
Those skilled in the art will appreciate that the present invention may be implemented as a method, system, and storage medium.
Thus, the invention may be embodied in the form of: either entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or entirely software, or a combination of hardware and software, referred to herein generally as a "circuit," module "or" system. Furthermore, in some embodiments, the invention may also be embodied in the form of a computer program product in one or more computer-readable media, which contain computer-readable program code. Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A method of strain assessment at a concave apex of a pipe, comprising:
determining a concave vertex of a concave region from a three-dimensional morphology image of a target pipeline comprising the concave region;
determining a target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the axial direction of the concave pipeline, and determining a target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the circumferential direction of the concave pipeline;
and obtaining a target strain value of the target pipeline at the concave vertex based on the target axial curvature radius, the target circumferential curvature radius, the concave depth and the concave length of the concave region.
2. The method of strain assessment at a pipe depression apex of claim 1, further comprising:
and carrying out concave profile scanning on the concave area in the target pipeline by using a laser three-dimensional scanner to obtain the three-dimensional morphology image.
3. The method of strain assessment at a concave apex of a pipe according to claim 1, wherein the step of determining a target axial radius of curvature at the concave apex from a concave depth direction at the concave apex and a concave pipe axial direction comprises:
constructing a three-dimensional Cartesian coordinate system by taking the concave vertex as an origin, the standard pipeline axial direction as an X axis, the standard pipeline circumferential direction as a Y axis and the pipeline depth direction as a Z axis, and mapping the three-dimensional morphology image into the three-dimensional Cartesian coordinate system to obtain a straight line where the concave pipeline at the concave vertex is axially located, a straight line where the concave pipeline circumferential direction is located and a straight line where the concave depth direction is located;
constructing a first plane comprising a straight line in which the concave depth direction at a concave vertex is positioned and a straight line in which the concave pipeline is axially positioned in the three-dimensional Cartesian coordinate system, and determining an intersection line of the first plane and the three-dimensional morphology image as a concave axial contour line;
constructing a plurality of first circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the first circumscribed circles meeting a first preset condition as the target axial curvature radiuses from all the first circumscribed circles;
the step of determining the target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the concave pipeline circumferential direction comprises the following steps:
constructing a second plane comprising a straight line in which the concave depth direction at the concave vertex is located and a straight line in which the concave pipeline is located in the annular direction in the three-dimensional Cartesian coordinate system, and determining an intersection line of the second plane and the three-dimensional morphology image as a concave annular contour line;
and constructing a plurality of second circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the second circumscribed circles meeting second preset conditions as the target circumferential curvature radiuses from all the second circumscribed circles.
4. The method of claim 1, wherein the step of obtaining a target strain value for the target pipe at the concave apex based on the target axial radius of curvature, the target circumferential radius of curvature, the concave depth of the concave region, and the concave length comprises:
substituting the target circumferential curvature radius into a circumferential bending strain calculation formula to obtain a circumferential bending strain value at the concave vertex; the calculation formula of the circumferential bending strain is as follows:ε 1 for the circumferential bending strain value, t is the wall thickness of the target pipeline, R 0 R is the radius of the pipeline when the target pipeline is not deformed 2 A radius of curvature for the target circumferential direction;
substituting the target axial curvature radius into an axial bending strain calculation formula to obtain an axial bending strain value at the concave vertex; wherein, the axial bending strain calculation formula is:ε 2 for the axial bending strain value, R 1 Is the target axial radius of curvature;
substituting the concave depth and the concave length into an axial film strain calculation formula to obtain an axial film strain value at the vertex of the concave; wherein, the axial film strain calculation formula is:d is the depth of the recess, L is the length of the recess, ε 3 -the axial film strain value;
substituting the annular bending strain value, the axial bending strain value and the axial film strain value into a total strain calculation formula at the concave vertex to obtain the target strain value; wherein, the total strain calculation formula at the concave vertex is:epsilon is the target strain value.
5. The method of strain assessment at a tube concave apex according to any one of claims 1-4, further comprising:
and when the target strain value is larger than a preset strain value, judging that the target pipeline has safety risk and outputting early warning information.
6. A strain assessment system at a peak of a pipe depression, comprising: the system comprises an acquisition module, a processing module and an evaluation module;
the acquisition module is used for: determining a concave vertex of a concave region from a three-dimensional morphology image of a target pipeline comprising the concave region;
the processing module is used for: determining a target axial curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the axial direction of the concave pipeline, and determining a target circumferential curvature radius at the concave vertex according to the concave depth direction at the concave vertex and the circumferential direction of the concave pipeline;
the evaluation module is used for: and obtaining a target strain value of the target pipeline at the concave vertex based on the target axial curvature radius, the target circumferential curvature radius, the concave depth and the concave length of the concave region.
7. The system for strain assessment at a tube concave apex of claim 6, further comprising: an acquisition module;
the acquisition module is used for: and carrying out concave profile scanning on the concave area in the target pipeline by using a laser three-dimensional scanner to obtain the three-dimensional morphology image.
8. The system of claim 6, wherein the processing module is configured to:
constructing a three-dimensional Cartesian coordinate system by taking the concave vertex as an origin, the standard pipeline axial direction as an X axis, the standard pipeline circumferential direction as a Y axis and the pipeline depth direction as a Z axis, and mapping the three-dimensional morphology image into the three-dimensional Cartesian coordinate system to obtain a straight line where the concave pipeline at the concave vertex is axially located, a straight line where the concave pipeline circumferential direction is located and a straight line where the concave depth direction is located;
constructing a first plane comprising a straight line in which the concave depth direction at a concave vertex is positioned and a straight line in which the concave pipeline is axially positioned in the three-dimensional Cartesian coordinate system, and determining an intersection line of the first plane and the three-dimensional morphology image as a concave axial contour line;
constructing a plurality of first circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the first circumscribed circles meeting a first preset condition as the target axial curvature radiuses from all the first circumscribed circles;
constructing a second plane comprising a straight line in which the concave depth direction at the concave vertex is located and a straight line in which the concave pipeline is located in the annular direction in the three-dimensional Cartesian coordinate system, and determining an intersection line of the second plane and the three-dimensional morphology image as a concave annular contour line;
and constructing a plurality of second circumscribed circles with different radiuses and passing through the coordinates of the concave vertexes in the three-dimensional Cartesian coordinate system, and determining the radiuses of the second circumscribed circles meeting second preset conditions as the target circumferential curvature radiuses from all the second circumscribed circles.
9. The system of claim 6, wherein the evaluation module is specifically configured to:
substituting the target circumferential curvature radius into a circumferential bending strain calculation formula to obtain a circumferential bending strain value at the concave vertex; the calculation formula of the circumferential bending strain is as follows:ε 1 for the circumferential bending strain value, t is the wall thickness of the target pipeline, R 0 R is the radius of the pipeline when the target pipeline is not deformed 2 A radius of curvature for the target circumferential direction;
substituting the target axial curvature radius into an axial bending strain calculation formula to obtain an axial bending strain value at the concave vertex; wherein, the axial bending strain calculation formula is:ε 2 for the axial bending strain value, R 1 Is the target axial radius of curvature;
substituting the concave depth and the concave length into an axial film strain calculation formula to obtain an axial film strain value at the vertex of the concave; wherein, the axial film strain calculation formula is:d is the depth of the recess, L is the length of the recess, ε 3 -the axial film strain value;
substituting the annular bending strain value, the axial bending strain value and the axial film strain value into a total strain calculation formula at the concave vertex to obtain the target strain value; wherein, the total strain calculation formula at the concave vertex is:epsilon is the target strain value.
10. A storage medium having instructions stored therein, which when read by a computer, cause the computer to perform the method of strain assessment at a pipe depression apex as claimed in any one of claims 1 to 5.
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