CN-122020989-A - Method and device for processing pipeline initial stress, electronic equipment, storage medium and program product

CN122020989ACN 122020989 ACN122020989 ACN 122020989ACN-122020989-A

Abstract

The application provides a method, a device, an electronic device, a storage medium and a program product for processing pipeline initial stress, wherein the method comprises the following steps: responding to an initial stress analysis request of a target pipeline to determine stress variation corresponding to a plurality of characteristic points on the target pipeline at any two moments, obtaining a first relation group through a pre-constructed stress relation and stress variation corresponding to the plurality of characteristic points at any two moments, obtaining a second relation group between initial stress, initial bending moment and initial axial force corresponding to the plurality of characteristic points through the stress relation, determining a second initial bending moment and corresponding to the first initial bending moment through the first relation group, determining initial axial force corresponding to the target pipeline, and obtaining initial stress corresponding to each characteristic point on the target pipeline according to the first initial bending moment, the second initial bending moment and the initial axial force. Based on the method provided by the application, the initial stress of the pipeline can be directly and accurately obtained.

Inventors

WANG YANBING
LIU XIAOBEN
FU MENGKAI
LI ANQI
SHANG YUXIN

Assignees

中国石油大学(北京)

Dates

Publication Date: 20260512
Application Date: 20260107

Claims (10)

1. A method for processing initial stress of a pipeline, which is applied to a server, comprising: responding to an initial stress analysis request of a target pipeline to determine stress variation corresponding to a plurality of characteristic points on the target pipeline at any two moments; Obtaining a first relation group through the pre-constructed stress relation and stress variation corresponding to the feature points at any two moments, wherein the first relation group comprises a plurality of first relations, and the first relations are used for representing the stress variation of each feature point; Obtaining a second relation group between initial stress, initial bending moment and initial axial force corresponding to a plurality of characteristic points through the stress relation, wherein the second relation group comprises a plurality of second relation, and the second relation is used for representing the relation among the initial bending moment, initial axial force and initial stress corresponding to each characteristic point; Determining a first initial bending moment corresponding to a first direction and a second initial bending moment corresponding to a second direction through the first relation group; determining initial axial force corresponding to the target pipeline through the first initial bending moment, the second initial bending moment and the second relation group; and obtaining initial stress corresponding to each characteristic point on the target pipeline according to the first initial bending moment, the second initial bending moment and the initial axial force.
2. The method according to claim 1, wherein determining the stress variation corresponding to the plurality of feature points on the target pipeline at any two moments comprises: Determining coordinate data of a plurality of characteristic points on the target pipeline on corresponding target cross sections; Determining the cross-section curvature corresponding to the target cross-section; Constructing a third relation between bending strain and cross-sectional curvature according to the coordinate data and the cross-sectional curvature; based on the third relation, determining bending strain difference values corresponding to the characteristic points at any two moments; Determining the modulus of elasticity of the target pipe; And obtaining stress variation corresponding to the plurality of characteristic points at any two moments based on the elastic modulus of the target pipeline and the bending strain difference corresponding to the plurality of characteristic points at any two moments.
3. The method of claim 1, wherein determining, by the first set of relationships, a first initial bending moment corresponding to a first direction and a second initial bending moment corresponding to a second direction comprises: Determining a coefficient matrix and an observation vector corresponding to the first relation group; simplifying the first relation group through the coefficient matrix and the observation vector to obtain a corresponding matrix equation; and solving the matrix equation based on a least square method to obtain the first initial bending moment and the second initial bending moment.
4. A method according to claim 3, wherein said solving the matrix equation based on the least squares method to obtain the first initial bending moment and the second initial bending moment comprises: Determining the number of corresponding sub-equations in the matrix equation and a preset round; constructing a third equation set corresponding to the matrix equation through the number of the sub-equations and a preset round; Determining a transpose matrix corresponding to the coefficient matrix; and solving the third equation set through the transposed matrix to obtain the first initial bending moment and the second initial bending moment.
5. The method according to claim 1, wherein obtaining initial stresses corresponding to each feature point on the target pipeline according to the first initial bending moment, the second initial bending moment and the initial axial force comprises: Substituting the first initial bending moment, the second initial bending moment and the initial axial force into each second relation in the second relation group to obtain initial stress corresponding to each characteristic point on the target pipeline.
6. The method of claim 1, wherein the constructing of the stress relationship comprises: Determining a section axial force, a section area, first coordinate data in a first direction, second coordinate data in a second direction, a section moment of inertia, a first bending moment component in the first direction and a second bending moment component in the second direction, which correspond to the characteristic points on the section, corresponding to the target pipeline; determining the ratio of the cross-sectional axial force to the cross-sectional area as a tensile-compressive stress relationship; determining a first product between the first bending moment component and the first coordinate data and a second product between the second bending moment component and the second coordinate data; summing the first product and the second product, and determining the ratio of the obtained summation result to the section moment of inertia as a bending stress relation; And summing the tensile stress relation and the bending stress relation to obtain the stress relation.
7. A device for handling initial stress of a pipeline, applied to a server, comprising: The response module is used for responding to an initial stress analysis request of the target pipeline so as to determine the stress variation corresponding to a plurality of characteristic points on the target pipeline at any two moments; The processing module is used for obtaining a first relation group through the pre-constructed stress relation and stress variation corresponding to the feature points at any two moments, wherein the first relation group comprises a plurality of first relations, and the first relations are used for representing the stress variation of the feature points; The processing module is further used for obtaining a second relation group among initial stress, initial bending moment and initial axial force corresponding to the plurality of feature points through the stress relation, wherein the second relation group comprises a plurality of second relation, and the second relation is used for representing the relation among the initial bending moment, initial axial force and initial stress corresponding to the feature points; The processing module is further used for determining a first initial bending moment corresponding to the first direction and a second initial bending moment corresponding to the second direction through the first relation group; The processing module is further used for determining initial axial force corresponding to the target pipeline through the first initial bending moment, the second initial bending moment and the second relation group; and the processing module is also used for obtaining initial stress corresponding to each characteristic point on the target pipeline according to the first initial bending moment, the second initial bending moment and the initial axial force.
8. An electronic device comprising a processor and a memory communicatively coupled to the processor; The memory stores computer-executable instructions; The processor executes computer-executable instructions stored in the memory to implement the method of any one of claims 1-6.
9. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1-6.
10. A computer program product comprising a computer program which, when executed by a processor, implements the method of any of claims 1-6.

Description

Method and device for processing pipeline initial stress, electronic equipment, storage medium and program product Technical Field The present application relates to the field of pipeline engineering detection technologies, and in particular, to a method and apparatus for processing initial stress of a pipeline, an electronic device, a storage medium, and a program product. Background The analysis of the initial stress of the pipeline can identify and control the potential problems of the pipeline in the initial stage of installation or operation in advance, so that the pipeline is ensured to be safe and stable and meet the design requirements. At present, for analysis of pipeline stress, strain gauges are mostly used for measuring the relative variation of stress, but initial stress cannot be directly obtained, so that a dead zone exists in stress evolution analysis, while ultrasonic stress measurement technology can attempt to detect the absolute value of the initial stress, but is affected by poor stability of coupling conditions on the surface of the pipeline, material anisotropic interference and environmental noise, and methods such as ultrasonic detection, X-ray detection and the like are complex in operation, only stress at a certain moment can be measured, and continuous monitoring of the stress cannot be realized. Therefore, it is a need in the art to provide a method that can directly and accurately obtain the initial stress of the pipeline. Disclosure of Invention The embodiment of the application provides a method, a device, electronic equipment, a storage medium and a program product for processing pipeline initial stress, which can directly and accurately obtain the pipeline initial stress. In a first aspect, an embodiment of the present application provides a method for processing an initial stress of a pipe, which is applied to a server, including: responding to an initial stress analysis request of a target pipeline to determine stress variation corresponding to a plurality of characteristic points on the target pipeline at any two moments; obtaining a first relation group through the pre-constructed stress relation and stress variation corresponding to the plurality of characteristic points at any two moments, wherein the first relation group comprises a plurality of first relation, and the first relation is used for representing the stress variation of each characteristic point; obtaining a second relation group between initial stress, initial bending moment and initial axial force corresponding to the characteristic points through a stress relation, wherein the second relation group comprises a plurality of second relation, and the second relation is used for representing the relation among the initial bending moment, initial axial force and initial stress corresponding to the characteristic points; determining a first initial bending moment corresponding to a first direction and a second initial bending moment corresponding to a second direction through a first relation group; determining initial axial force corresponding to the target pipeline through the first initial bending moment, the second initial bending moment and the second relation group; and obtaining initial stress corresponding to each characteristic point on the target pipeline according to the first initial bending moment, the second initial bending moment and the initial axial force. In one possible implementation manner, determining the stress variation corresponding to the plurality of feature points on the target pipeline at any two moments includes: Determining coordinate data of a plurality of characteristic points on a target pipeline on a corresponding target cross section; Determining the cross-section curvature corresponding to the target cross-section; constructing a third relation between bending strain and cross-sectional curvature according to the coordinate data and the cross-sectional curvature; based on a third relation, determining bending strain difference values corresponding to the characteristic points at any two moments; determining the elastic modulus of the target pipeline; And obtaining the corresponding stress variation of the plurality of characteristic points at any two moments based on the elastic modulus of the target pipeline and the bending strain difference value corresponding to the plurality of characteristic points at any two moments. In one possible embodiment, determining, by the first set of relationships, a first initial bending moment corresponding to the first direction and a second initial bending moment corresponding to the second direction, includes: Determining a coefficient matrix and an observation vector corresponding to the first relation group; simplifying the first relation group through the coefficient matrix and the observation vector to obtain a corresponding matrix equation; And solving the matrix equation based on a least square method to obtain a first initial b