Pipeline wall thickness determination method, device, equipment, medium and product

Abstract

The invention provides a pipeline wall thickness determination method and device, equipment, a medium and a product, and relates to the technical field of pipeline design. The method comprises the following steps: constructing a first simulation model through finite element analysis software; in the first pipeline model, constructing a second pipeline model containing an initial defect, and constructing a second simulation model according to the second pipeline model and the soil model; simulating maximum radial displacement and maximum equivalent plastic strain under different working condition data through a second simulation model; fitting a first function model according to the working condition data and the maximum radial displacement, and fitting a second function model according to the working condition data and the maximum equivalent plastic strain; and solving the minimum wall thickness of the pipeline from the first function model and the second function model. According to the method, by considering the defects of the pipeline and the influence factors of the pipeline under the action of the circulating thermal load, the pipeline wall thickness which not only can ensure the structural safety of the pipeline during conveying of the thermal medium, but also can consider the economical efficiency of material use can be calculated.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline design, and in particular to a method, device, equipment, medium and product for determining pipeline wall thickness. Background Art

[0002] In large-diameter buried pipelines that transport hot water, crude oil and other heating media, reasonable design of pipeline wall thickness is a key factor in ensuring the service life of the pipeline and effectively saving materials.

[0003] In the prior art, the buckling performance of buried pipelines is usually calculated based on the empirical formula of the axis buckling load of the elastic thin shell instability theory, and the pipeline wall thickness is calculated accordingly. Specifically, first, the basic parameters of the pipeline are determined, including: pipeline diameter, pipeline length, elastic modulus of pipeline material, yield strength of pipeline material, internal pressure and external pressure of the pipeline, etc.; then, according to the elastic thin shell instability theory, the critical buckling load of the pipeline is obtained; then, according to the empirical formula of the axis buckling load, the expression of the wall thickness is derived, and finally, according to the basic parameters of the pipeline and the critical buckling load, the pipeline wall thickness is determined.

[0004] However, according to the existing method for determining the pipe wall thickness, the calculated pipe wall thickness usually cannot take into account both the structural safety of the pipe when transporting heat medium and the economic efficiency of material use. Summary of the invention

[0005] The present application provides a method, device, equipment, medium and product for determining the wall thickness of a pipeline. By considering the defects of the pipeline and the influencing factors under the action of cyclic heat load, the wall thickness of the pipeline can be calculated to ensure the structural safety of the pipeline when transporting heat medium and take into account the economy of material use.

[0006] In a first aspect, the present application provides a method for determining pipe wall thickness, the method comprising:

[0007] Constructing a first simulation model by using finite element analysis software, the first simulation model includes a first pipeline model and a soil model, the first pipeline model is used to describe pipeline characteristics, and the soil model is used to describe soil characteristics;

[0008] In the first pipeline model, an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness are added to construct a second pipeline model including the initial defect, and a second simulation model is constructed according to the second pipeline model and the soil model;

[0009] The maximum radial displacement and the maximum equivalent plastic strain under different working condition data are simulated by the second simulation model, and the working condition data include: the internal pressure of the pipeline, the diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of the non-straightness of the pipeline, the width of the initial geometric defect of the non-straightness of the pipeline, and the temperature of the pipeline;

[0010] Fitting a first function model according to the operating data and the maximum radial displacement, and fitting a second function model according to the operating data and the maximum equivalent plastic strain;

[0011] The minimum wall thickness of the pipeline under the preset maximum radial displacement and the preset maximum equivalent plastic strain is solved from the first function model and the second function model.

[0012] In one possible design, the first function model is as follows:

[0013]

[0014] Where D is the pipe diameter, k is the width of the initial geometric defect of the pipe's non-straightness, t is the pipe's wall thickness, T is the pipe's temperature, B is the initial geometric defect of the pipe's non-straightness, Z is the maximum radial displacement, and a1 to a 31 and b are fitting coefficients, y1, y2 and y3 are intermediate variables;

[0015] The second function model is as follows:

[0016]

[0017] Where, is the maximum equivalent plastic strain, c1 to c 31 and d are fitting coefficients, y1, y2 and y3 are intermediate variables.

[0018] In a possible design, the minimum wall thickness of the pipe under a preset maximum radial displacement and a preset maximum equivalent plastic strain is solved from the first function model and the second function model, including:

[0019] Solving the first minimum wall thickness of the pipe under a preset maximum radial displacement from the first function model;

[0020] Solving the second minimum wall thickness of the pipe under a preset maximum equivalent plastic strain from the second function model;

[0021] A minimum value is selected from the first minimum wall thickness, the second minimum wall thickness and the preset minimum wall thickness as the minimum wall thickness of the pipe.

[0022] In a possible design, the second pipeline model is a four-node model, and the parameters of the second pipeline model include at least one of the following: the tensile strength of the pipe is 370 MPa, the yield strength of the pipe is 235 MPa, the pipe diameter is within a range of 529 mm to 1420 mm, the wall thickness is within a range of 5 mm to 20 mm, the friction coefficient with the soil is 0.3, the normal contact mode with the soil is hard contact, the Poisson's ratio is 0.3, and the temperature load of the pipeline is between 40 degrees Celsius and 120 degrees Celsius;

[0023] The soil model is an eight-node hexahedron model with a length of 100 meters, a width of 4 meters, and a height of 7 meters.

[0024] The number of finite elements divided at the non-straightness initial geometric defect of the second pipeline model is greater than the number of finite elements divided at other parts of the second pipeline model.

[0025] In a possible design, fitting a first function model according to the operating data and the maximum radial displacement, and fitting a second function model according to the operating data and the maximum equivalent plastic strain, include:

[0026] For multiple target parameters with the same dimension, the multiple target parameters are arbitrarily combined to obtain multiple parameter combinations, and the multiple target parameters include: pipe diameter, pipe wall thickness, pipe non-straightness initial geometric defect, and width of pipe non-straightness initial geometric defect;

[0027] According to the random forest algorithm, the importance of each parameter combination is determined;

[0028] Fitting a first function model through a combination of parameters whose importance is greater than or equal to a preset threshold, as well as temperature, internal pressure, and maximum radial displacement;

[0029] The second function model is fitted by using a combination of parameters whose importance is greater than or equal to a preset threshold, as well as temperature, internal pressure, and maximum equivalent plastic strain.

[0030] In one possible design, the preset maximum equivalent plastic strain can be predetermined by the following process:

[0031] Obtain the maximum temperature action cycle number and the maximum elastic strain;

[0032] The total strain of the pipeline under the maximum number of temperature cycles is calculated using the steel fatigue life formula;

[0033] Calculate the difference between the total strain of the pipeline and the maximum elastic strain as the preset maximum equivalent plastic strain;

[0034] Among them, the steel fatigue life formula is:

[0035] ε1=0.003(2N) -0.08 +0.1559(2N) -0.462

[0036] Where N is the maximum temperature action cycle number, and ε1 is the total strain of the pipeline.

[0037] In a second aspect, the present application provides a device for determining pipe wall thickness, the device comprising:

[0038] A first construction module is used to construct a first simulation model by using finite element analysis software, wherein the first simulation model includes a first pipeline model and a soil model, wherein the first pipeline model is used to describe pipeline characteristics, and the soil model is used to describe soil characteristics;

[0039] A second construction module is used to add an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness to the first pipeline model, construct a second pipeline model containing the initial defect, and construct a second simulation model according to the second pipeline model and the soil model;

[0040] A simulation module is used to simulate the maximum radial displacement and the maximum equivalent plastic strain under different working condition data through the second simulation model, and the working condition data include: the internal pressure of the pipeline, the diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of the non-straightness of the pipeline, the width of the initial geometric defect of the non-straightness of the pipeline, and the temperature of the pipeline;

[0041] A fitting module, used for fitting a first function model according to the working condition data and the maximum radial displacement, and for fitting a second function model according to the working condition data and the maximum equivalent plastic strain;

[0042] The solution module is used to solve the minimum wall thickness of the pipeline under the preset maximum radial displacement and the preset maximum equivalent plastic strain from the first function model and the second function model.

[0043] In one possible design, in the solution module, the first function model is as follows:

[0044]

[0045] Where D is the pipe diameter, k is the width of the initial geometric defect of the pipe's non-straightness, t is the pipe's wall thickness, T is the pipe's temperature, B is the initial geometric defect of the pipe's non-straightness, Z is the maximum radial displacement, and a1 to a 31 and b are fitting coefficients, y1, y2 and y3 are intermediate variables;

[0046] The second function model is as follows:

[0047]

[0048] Where, is the maximum equivalent plastic strain, c1 to c 31 and d are fitting coefficients, y1, y2 and y3 are intermediate variables.

[0049] In a possible design, the solution module includes: a first wall thickness module, a second wall thickness module and a selection module;

[0050] A first wall thickness module, used for solving a first minimum wall thickness of the pipeline under a preset maximum radial displacement from a first function model;

[0051] A second wall thickness module, used for solving the second minimum wall thickness of the pipeline under a preset maximum equivalent plastic strain from a second function model;

[0052] The selection module is used to select a minimum value from the first minimum wall thickness, the second minimum wall thickness and the preset minimum wall thickness as the minimum wall thickness of the pipeline.

[0053] In a possible design, in the second building module, the second pipeline model is a four-node model, and the parameters of the second pipeline model include at least one of the following: the tensile strength of the pipe is 370 MPa, the yield strength of the pipe is 235 MPa, the pipe diameter is within a range of 529 mm to 1420 mm, the wall thickness is within a range of 5 mm to 20 mm, the friction coefficient with the soil is 0.3, the normal contact mode with the soil is hard contact, the Poisson's ratio is 0.3, and the temperature load of the pipeline is between 40 degrees Celsius and 120 degrees Celsius;

[0054] The soil model is an eight-node hexahedron model with a length of 100 meters, a width of 4 meters, and a height of 7 meters.

[0055] The number of finite elements divided at the non-straightness initial geometric defect of the second pipeline model is greater than the number of finite elements divided at other parts of the second pipeline model.

[0056] In one possible design, the fitting module includes a combining module, a determining module, a first fitting module, and a second fitting module;

[0057] A combination module is used for arbitrarily combining multiple target parameters with the same dimension to obtain multiple parameter combinations, wherein the multiple target parameters include: pipe diameter, pipe wall thickness, non-straightness initial geometric defect of the pipe and width of the non-straightness initial geometric defect of the pipe;

[0058] A determination module is used to determine the importance of each parameter combination according to a random forest algorithm;

[0059] A first fitting module, used for fitting a first function model through a parameter combination whose importance is greater than or equal to a preset threshold, as well as temperature, internal pressure, and maximum radial displacement;

[0060] The second fitting module is used to fit the second function model through a parameter combination whose importance is greater than or equal to a preset threshold, as well as temperature, internal pressure, and maximum equivalent plastic strain.

[0061] In one possible design, the solution module further includes an acquisition module, a total strain module, and a difference module;

[0062] An acquisition module is used to obtain the maximum temperature action cycle number and the maximum elastic strain;

[0063] Total strain module, used to calculate the total strain of the pipeline under the maximum temperature cycle number through the steel fatigue life formula;

[0064] The difference module is used to calculate the difference between the total strain of the pipeline and the maximum elastic strain as the preset maximum equivalent plastic strain;

[0065] Among them, the steel fatigue life formula is:

[0066] ε1=0.003(2N) -0.08 +0.1559(2N) -0.462

[0067] Where N is the maximum temperature action cycle number, and ε1 is the total strain of the pipeline.

[0068] In a third aspect, the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0069] Memory stores computer-executable instructions;

[0070] The processor executes the computer-executable instructions stored in the memory to implement a method for determining the pipe wall thickness according to the first aspect of the invention.

[0071] In a fourth aspect, the present application provides a computer-readable storage medium, in which computer execution instructions are stored. When the computer execution instructions are executed by a processor, a method for determining the wall thickness of a pipe is implemented according to the invention content of the first aspect.

[0072] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, is used to implement a method for determining a pipe wall thickness according to the invention of the first aspect.

[0073] The present application provides a method, device, equipment, medium and product for determining the wall thickness of a pipeline. The method comprises: constructing a first simulation model through finite element analysis software, the first simulation model comprising a first pipeline model and a soil model, the first pipeline model being used to describe pipeline characteristics, and the soil model being used to describe soil characteristics; in the first pipeline model, adding an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness to construct a second pipeline model containing the initial defect, and constructing a second simulation model based on the second pipeline model and the soil model; simulating the maximum radial displacement and the maximum equivalent plastic strain under different operating data through the second simulation model, the operating data comprising: the internal pressure of the pipeline, the pipe diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of non-straightness of the pipeline, the width of the initial geometric defect of non-straightness of the pipeline, and the temperature of the pipeline; fitting a first function model based on the operating data and the maximum radial displacement, and fitting a second function model based on the operating data and the maximum equivalent plastic strain; solving the minimum wall thickness of the pipeline under a preset maximum radial displacement and a preset maximum equivalent plastic strain from the first function model and the second function model. The following technical effects are achieved: by adding the initial geometric defect of non-straightness and the width of the initial geometric defect of non-straightness to the first pipeline model, a second pipeline model with initial defects is obtained, and a second simulation model is constructed according to the second pipeline model and the soil model, so that the second simulation model includes the most serious situation of the initial geometric defect of the pipeline in engineering practice; by making the working condition data include the temperature of the pipeline, the initial geometric defect of non-straightness of the pipeline, and the width of the initial geometric defect of non-straightness of the pipeline, the defects of the pipeline and the influencing factors under the action of cyclic heat load are included in the fitted first function model and the second function model, so that the minimum wall thickness of the pipeline solved from the first function model and the second function model fully takes into account the structural safety required for the pipeline when transporting heat medium and the economy of material use. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0075] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0076] Figure 1 A schematic diagram of a pipeline wall thickness determination method provided in an embodiment of the present application Figure 1 ;

[0077] Figure 2 A schematic diagram of a first simulation model provided in an embodiment of the present application;

[0078] Figure 3 A schematic diagram of an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness provided in an embodiment of the present application;

[0079] Figure 4 A schematic diagram of a pipeline wall thickness determination method provided in an embodiment of the present application Figure 2 ;

[0080] Figure 5 A schematic diagram of the structure of a device for determining pipe wall thickness provided in an embodiment of the present application;

[0081] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0082] Reference numerals:

[0083] 210-first pipeline model; 220-soil model;

[0084] 310 - second pipeline model; 320 - non-straightness initial geometric defect; 330 - width of non-straightness initial geometric defect;

[0085] 510 - first construction module; 520 - second construction module; 530 - simulation module; 540 - fitting module; 550 - solution module;

[0086] 610 - processor; 620 - memory; 630 - communication component; 640 - bus. DETAILED DESCRIPTION

[0087] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0088] In the embodiments of the present application, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will appreciate that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference. It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way. In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more.

[0089] It should be noted that the "at..." in the embodiment of the present application can be the instant when a certain situation occurs, or can be a period of time after a certain situation occurs, and the embodiment of the present application does not specifically limit this. In addition, the method for determining the wall thickness of a pipe provided in the embodiment of the present application is only used as an example, and the method for determining the wall thickness of a pipe can also include more or less content.

[0090] In order to clearly describe the technical solutions of the embodiments of the present application, some terms and technologies involved in the embodiments of the present application are briefly introduced below:

[0091] Radial displacement: refers to the displacement of the pipeline along its radius. Specifically, if the pipeline is regarded as a cylinder, the radial displacement is the displacement perpendicular to the axis of the pipeline. In other words, radial displacement refers to the movement or deformation of the pipeline in the direction perpendicular to its axis. Radial displacement can be caused by many factors, such as thermal expansion and contraction caused by temperature changes, changes in external pressure, pressure fluctuations of internal fluids, etc. In pipeline design, it is of great significance to correctly predict and control radial displacement because it affects the stability and safety of the pipeline. Especially in cases involving high-temperature or high-pressure fluid transportation, accurate calculation of radial displacement can help avoid damage to the pipeline due to excessive stress.

[0092] Plastic strain: refers to the irreversible deformation of a material after it exceeds its elastic limit. Unlike elastic strain, which allows the material to return to its original shape after stress is released, plastic strain remains in the material after stress is released.

[0093] Non-straightness initial geometric defect: refers to the phenomenon that the straightness of the pipeline does not meet the standard requirements due to various reasons during the manufacturing or installation process of the pipeline. This defect will cause the straightness deviation of the pipeline in the axial direction, that is, the pipeline is not completely straight, but has a certain degree of bending or twisting. In the embodiment of the present application, the non-straightness initial geometric defect refers to the amplitude of the non-straightness of the axial section of the pipeline, and the preset value is 0.2 times the pipeline wall thickness to 0.6 times the pipeline wall thickness.

[0094] Width of initial geometric defect of non-straightness: In the embodiment of the present application, the width of initial geometric defect of non-straightness refers to the width of non-straightness of the axial section of the pipeline, and the preset value is 100 mm to 1000 mm.

[0095] Pipe diameter: refers to the inner diameter of the pipe.

[0096] Thermal load: refers to the temperature of the pipe.

[0097] For hot water, crude oil and other media that need to be heated, large-diameter buried pipelines are often used for transportation. Reasonable design of the wall thickness of these buried pipelines is crucial to ensure the service life of the pipeline and achieve effective use of materials.

[0098] When calculating the buckling performance of buried pipelines and their wall thickness, the existing technology usually relies on the elastic thin shell instability theory and its axis buckling load empirical formula. The specific steps are as follows: first, determine the basic parameters of the pipeline, including the outer diameter of the pipeline, the length of the pipeline, the elastic modulus of the pipeline material, the yield strength of the pipeline material, the internal and external pressures of the pipeline, etc.; then, according to the elastic thin shell instability theory, calculate the critical buckling load of the pipeline; then, use the axis buckling load empirical formula to derive the expression of the wall thickness; finally, determine the wall thickness of the pipeline based on the basic parameters of the pipeline and the critical buckling load.

[0099] However, although the existing methods for determining pipeline wall thickness, especially those based on the elastic thin shell instability theory and the empirical formula of axis buckling load, provide an important theoretical basis for pipeline design and, to a certain extent, ensure the economical use of materials while meeting the service life of the pipeline, in practical applications, since the defects of the pipeline and their influence under the action of cyclic thermal load are not considered, the pipeline wall thickness calculated solely based on these methods is usually difficult to fully take into account the structural safety and economical use of materials required for the pipeline to transport heat media.

[0100] Based on this, the embodiment of the present application proposes a method, device, equipment, medium and product for determining the wall thickness of a pipeline, which can be used in the field of pipeline design technology, aiming to solve the above technical problems of the prior art. The method first constructs a first simulation model including a first pipeline model and a soil model according to the technology of finite element analysis, and constructs a second pipeline model containing initial defects by adding the initial geometric defects of non-straightness and the width of the initial geometric defects of non-straightness in the first pipeline model, thereby constructing a second simulation model according to the second pipeline model and the soil model; then, the maximum radial displacement and the maximum equivalent plastic strain under different working condition data are simulated by the second simulation model; then, the first function model is fitted according to the working condition data and the maximum radial displacement, and the second function model is fitted according to the working condition data and the maximum equivalent plastic strain; finally, the minimum wall thickness of the pipeline is inversely solved by inputting the maximum plastic strain and the preset maximum radial displacement preset in the design stage, so as to optimize its economy while ensuring the safety of the pipeline. That is to say, by comprehensively considering the potential defects of the pipeline and the influencing factors under the action of cyclic thermal load, the pipeline wall thickness that can ensure the structural safety of the pipeline when transporting hot media and take into account the economy of material use can be calculated. This improvement aims to solve the problem of balancing safety and economy in traditional methods, thereby improving the overall efficiency and reliability of pipeline design.

[0101] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0102] Figure 1 A schematic diagram of a pipeline wall thickness determination method provided in an embodiment of the present application Figure 1 .like Figure 1 As shown, the method includes:

[0103] S101. Construct a first simulation model using finite element analysis software.

[0104] In an embodiment of the present application, the executor of the pipeline wall thickness determination method may be a server, which may be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server, etc., without specific limitation here.

[0105] The first simulation model includes a first pipeline model and a soil model, wherein the first pipeline model is used to describe pipeline characteristics, and the soil model is used to describe soil characteristics. The first simulation model including the first pipeline model and the soil model can be constructed by finite element analysis software such as ABAQUS.

[0106] Figure 2 Schematic diagram of the first simulation model provided in the embodiment of the present application. Figure 2 As shown, when analyzing the first simulation model, a quarter of the model can be used for analysis. Figure 2 In the embodiment, the first simulation model includes a first pipeline model 210 and a soil model 220 .

[0107] S102, adding an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness to the first pipeline model, constructing a second pipeline model including the initial defect, and constructing a second simulation model according to the second pipeline model and the soil model.

[0108] Specifically, since the method of introducing defects through modal analysis may not represent the most serious situation of the initial geometric defects of the pipeline in actual engineering, the first pipeline model is obtained by adding the non-straightness initial geometric defects and the width of the non-straightness initial geometric defects to the first pipeline model, and a second simulation model is constructed based on the second pipeline model and the soil model, so that the second simulation model can include the most serious situation of the initial geometric defects of the pipeline in actual engineering. In order to clearly show the non-straightness initial geometric defects and the width of the non-straightness initial geometric defects in the embodiment of the present application, the following is a diagram of the non-straightness initial geometric defects and the width of the non-straightness initial geometric defects in the embodiment of the present application. Figure 3 Take this as an example to illustrate. Figure 3 Schematic diagram of the initial geometric defect of non-straightness and the width of the initial geometric defect of non-straightness provided in the embodiment of the present application. Figure 3 As shown, in the second pipeline model 310, the added non-straightness initial geometric defect 320 and the width 330 of the non-straightness initial geometric defect are included, wherein the width 330 of the non-straightness initial geometric defect is as shown in FIG. Figure 3 As shown by the dotted line in .

[0109] S103, simulating the maximum radial displacement and the maximum equivalent plastic strain under different working condition data through the second simulation model.

[0110] In the embodiment of the present application, the operating condition data include: the internal pressure of the pipeline (pressure, P), the diameter of the pipeline (diameter, D), the wall thickness of the pipeline (thick, t), the initial geometric defect of the straightness of the pipeline (B), the width of the initial geometric defect of the straightness of the pipeline (k), and the temperature of the pipeline (temperature, T).

[0111] Specifically, since pipelines in actual engineering can include different geometric configurations and can also work under different pipeline internal pressures and different pipeline temperatures, the open source language (Python) can be used to record macros in ABAQUS software to achieve batch modeling of finite element models, submission calculations of finite element models, and batch extraction of finite element model results, thereby extracting the maximum radial displacement and maximum equivalent plastic strain under different working conditions. That is, through the second simulation model, the maximum radial displacement and maximum equivalent plastic strain under different working conditions are simulated. In the second simulation model, pipe properties, such as the tensile strength and yield strength of the pipe, can be set to the measured values. Taking the common Q235 material properties as an example, the tensile strength can be set to 370 megapascals (Megapascal, MPa) and the yield strength can be set to 235MPa.

[0112] The wall thickness of the pipeline is usually 5 millimeters (mm) to 20 mm, and the initial geometric defect of the non-straightness of the pipeline is usually 0.2 times the wall thickness of the pipeline to 0.6 times the wall thickness of the pipeline, that is, 0.2t to 0.6t. The temperature of various heating media transported by pipelines is usually 40 degrees Celsius (℃) to 120℃.

[0113] Table 1 Working condition data value range

[0114] Serial number Working condition data Value range 1 Internal pressure of the pipe 0-2.5MPa 2 Pipeline non-straightness Initial geometric defects 0.2-0.6t 3 Pipe straightness Width of initial geometric defect 100-1000mm 4 Pipe diameter 529mm~1420mm 5 Pipe wall thickness 5mm~20mm 6 Pipeline temperature 40℃～120℃

[0115] Table 1 shows the value range of each working condition data.

[0116] S104, fitting a first function model according to the operating data and the maximum radial displacement, and fitting a second function model according to the operating data and the maximum equivalent plastic strain.

[0117] In this embodiment, the server may fit a first function model according to the operating data and the maximum radial displacement, and fit a second function model according to the operating data and the maximum equivalent plastic strain.

[0118] S105. Solve the minimum wall thickness of the pipeline under a preset maximum radial displacement and a preset maximum equivalent plastic strain from the first function model and the second function model.

[0119] Specifically, the server can further solve the minimum wall thickness of the pipeline from the first function model and the second function model according to the preset maximum radial displacement and the preset maximum equivalent plastic strain.

[0120] The present embodiment provides a method for determining the wall thickness of a pipeline, the method comprising: constructing a first simulation model through finite element analysis software, the first simulation model comprising a first pipeline model and a soil model, the first pipeline model being used to describe pipeline characteristics, and the soil model being used to describe soil characteristics; in the first pipeline model, adding an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness to construct a second pipeline model containing the initial defect, and constructing a second simulation model based on the second pipeline model and the soil model; simulating the maximum radial displacement and the maximum equivalent plastic strain under different operating data through the second simulation model, the operating data comprising: the internal pressure of the pipeline, the pipe diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of non-straightness of the pipeline, the width of the initial geometric defect of non-straightness of the pipeline, and the temperature of the pipeline; fitting a first function model based on the operating data and the maximum radial displacement, and fitting a second function model based on the operating data and the maximum equivalent plastic strain; solving the minimum wall thickness of the pipeline under a preset maximum radial displacement and a preset maximum equivalent plastic strain from the first function model and the second function model. The following technical effects are achieved: by adding the initial geometric defect of non-straightness and the width of the initial geometric defect of non-straightness to the first pipeline model, a second pipeline model with initial defects is obtained, and a second simulation model is constructed according to the second pipeline model and the soil model, so that the second simulation model includes the most serious situation of the initial geometric defect of the pipeline in engineering practice; by making the working condition data include the temperature of the pipeline, the initial geometric defect of non-straightness of the pipeline, and the width of the initial geometric defect of non-straightness of the pipeline, the defects of the pipeline and the influencing factors under the action of cyclic heat load are included in the fitted first function model and the second function model, so that the minimum wall thickness of the pipeline solved from the first function model and the second function model fully takes into account the structural safety required for the pipeline when transporting heat medium and the economy of material use.

[0121] Figure 4 A schematic diagram of a pipeline wall thickness determination method provided in an embodiment of the present application Figure 2 In one possible example, Figure 4 As shown, in this embodiment Figure 1 Based on the embodiment, how to fit the first function model and the second function model, and how to solve the minimum wall thickness of the pipeline are described in detail. Figure 4 As shown, the method includes:

[0122] S401, constructing a first simulation model using finite element analysis software.

[0123] S402, adding the non-straightness initial geometric defect and the width of the non-straightness initial geometric defect to the first pipeline model, constructing a second pipeline model including the initial defect, and constructing a second simulation model according to the second pipeline model and the soil model.

[0124] S403, simulating the maximum radial displacement and the maximum equivalent plastic strain under different working condition data through the second simulation model.

[0125] S401 - S403 are similar to S101 - S103 and will not be described in detail in this embodiment.

[0126] S404. For multiple target parameters with the same dimension, arbitrarily combine the multiple target parameters to obtain multiple parameter combinations.

[0127] In the embodiment of the present application, the second pipeline model is a four-node model, which can be specifically a four-node simplified integral shell element (S4R), that is, the shell element can be used to simulate the pipeline. The parameters of the second pipeline model include: the tensile strength of the pipe is 370MPa, the yield strength of the pipe is 235MPa, the pipe diameter is within 529mm to 1420mm, the wall thickness is within 5mm to 20mm, the friction coefficient between the pipeline and the soil is 0.3, the normal contact mode with the soil is hard contact, the Poisson's ratio is 0.3, and the temperature load of the pipeline is between 40℃ and 120℃. The soil model is an eight-node hexahedron model, which can be specifically an eight-node hexahedron simplified integral solid element (C3D8R), the length of the soil model is 100 meters, the width of the soil model is 4 meters, and the height of the soil model is 7 meters. At the initial geometric defect of the non-straightness of the second pipeline model, the number of finite elements divided is greater than the number of finite elements divided at other parts of the second pipeline model to improve the accuracy of the final determined pipeline wall thickness.

[0128] The multiple target parameters include: the diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of the non-straightness of the pipeline, and the width of the initial geometric defect of the non-straightness of the pipeline.

[0129] Specifically, for the pipe diameter, pipe wall thickness, pipe non-straightness initial geometric defect and pipe non-straightness initial geometric defect width of the same dimension, the basic principle of dimensional analysis (π theorem) can be used to perform dimensionless processing, that is, to make any combination of them to obtain multiple parameter combinations.

[0130] S405. Determine the importance of each parameter combination according to the random forest algorithm.

[0131] Specifically, after obtaining multiple parameter combinations, the Random Forest algorithm (RF) can be used to fit the maximum equivalent plastic strain and the maximum radial displacement, that is, by inputting multiple parameter combinations and the internal pressure and temperature of the pipeline into RF, and fitting and outputting the maximum equivalent plastic strain and the maximum radial displacement, the influence of each parameter combination on the maximum plastic strain and the maximum radial displacement, as well as the influence of the internal pressure and temperature of the pipeline on the maximum plastic strain and the maximum radial displacement, can be determined. Among them, the greater the influence, the more important the parameter combination is, and the greater the corresponding weight.

[0132] Table 2 Parameter combination weight table

[0133] Variable combination Weight Pipeline non-straightness Initial geometric defect (B) 0.4421 <![CDATA[D 2 / kt]]> 0.3760 D / t 0.0716 D / k 0.0647 k / t 0.0454

[0134] Table 2 schematically shows the weights of the five parameter combinations. The specific numerical values ​​of each weight are used to indicate the importance of the corresponding parameter combination. As can be seen from Table 2, in terms of the geometric structural parameters of the pipeline, the initial geometric defect of the pipeline straightness (B) and D 2 / kt has a great influence on the maximum plastic strain and the maximum radial displacement. Therefore, B and D can be selected under different internal pressures of the pipeline. 2 / kt and T are used as variables to fit the first function model and the second function model.

[0135] S406 , fitting a first function model through a parameter combination whose importance is greater than or equal to a preset threshold, and temperature, internal pressure, and maximum radial displacement.

[0136] Specifically, as shown in Table 2, the preset threshold can be 0.2, and the parameter combinations whose importance is greater than or equal to the preset threshold are B and D 2 / kt. The first function model is as follows:

[0137]

[0138] Where D is the pipe diameter, k is the width of the initial geometric defect of the pipe's non-straightness, t is the pipe's wall thickness, T is the pipe's temperature, B is the initial geometric defect of the pipe's non-straightness, Z is the maximum radial displacement, and a1 to a 31 and b are fitting coefficients, y1, y2 and y3 are intermediate variables. 31 and b are the fitting coefficients associated with the maximum radial displacement.

[0139] Table 3 Fitting coefficient values ​​associated with maximum radial displacement

[0140]

[0141]

[0142] Table 3 shows the fitting coefficients a1 to a1 under different internal pressure conditions. 31 and the value of b.

[0143] S407, fitting a second function model through a parameter combination whose importance is greater than or equal to a preset threshold, as well as temperature, internal pressure, and maximum equivalent plastic strain.

[0144] In the embodiment of the present application, the second function model is as follows:

[0145]

[0146] Where ε is the maximum equivalent plastic strain, c1 to c 31 and d are fitting coefficients, y1, y2 and y3 are intermediate variables. 31 and d are the fitting coefficients associated with the maximum equivalent plastic strain.

[0147] Table 4 Fitting coefficient values ​​associated with the maximum equivalent plastic strain

[0148]

[0149]

[0150] Table 4 shows the fitting coefficients c1 to c2 under different internal pressure conditions. 31 and the value of d.

[0151] S408. Calculate the first minimum wall thickness of the pipeline under a preset maximum radial displacement from the first function model.

[0152] Specifically, the first intermediate deformation function model can be obtained from the first function model:

[0153]

[0154] y7 is an intermediate variable. By bringing the preset maximum radial displacement into the above-mentioned first intermediate deformation function model, the first minimum wall thickness of the pipeline can be solved.

[0155] S409: Calculate the second minimum wall thickness of the pipeline under a preset maximum equivalent plastic strain from the second function model.

[0156] Specifically, the second intermediate deformation function model can be obtained from the second function model:

[0157]

[0158] y8 is an intermediate variable. By bringing the preset maximum equivalent plastic strain into the above second intermediate deformation function model, the second minimum wall thickness of the pipeline can be solved.

[0159] S410: Select a minimum value from the first minimum wall thickness, the second minimum wall thickness, and the preset minimum wall thickness as the minimum wall thickness of the pipeline.

[0160] In this embodiment, after solving the first minimum wall thickness and the second minimum wall thickness through the first function model and the second function model, the server can select the minimum value from the first minimum wall thickness, the second minimum wall thickness and the preset minimum wall thickness as the final minimum wall thickness of the pipeline.

[0161] In one embodiment, the preset maximum equivalent plastic strain may also be predetermined by the following process:

[0162] Obtain the maximum number of temperature action cycles and the maximum elastic strain; calculate the total strain of the pipeline under the maximum number of temperature action cycles using the steel fatigue life formula; calculate the difference between the total strain of the pipeline and the maximum elastic strain as the preset maximum equivalent plastic strain.

[0163] Among them, the steel fatigue life formula is:

[0164] ε1=0.003(2N) -0.08 +0.1559(2N) -0.462

[0165] Among them, N is the maximum number of temperature action cycles, and ε1 is the total strain of the pipeline. For large-diameter buried pipelines that transport hot water, crude oil and other heating media, the maximum number of temperature action cycles is usually 100 to 500 times. In order to ensure the accuracy of the calculation results, the maximum number of temperature action cycles N can be taken as 500 times. For common Q235 materials, the elastic strain is:

[0166]

[0167] Substituting N=500 into the steel fatigue life formula, the total strain of the pipeline can be calculated to be 0.008136. By calculating the difference between the total strain of the pipeline and the maximum elastic strain, the preset maximum equivalent plastic strain can be obtained to be 0.007017.

[0168] Furthermore, after calculating the minimum wall thickness of the pipeline under different operating conditions according to the method of the embodiment of the present application, it can be compared with the pipe wall thickness calculated according to the standard calculation formula for pipe wall thickness in the technical standard CJJ / T81-2013 "Technical Code for Urban Direct Buried Heating Pipeline Engineering" to verify the method of the present application.

[0169] Table 5 Pipe wall thickness comparison table

[0170]

[0171] Table 5 shows the values of the pipe wall thickness under different working condition data. Among them, P represents the pressure, D represents the pipe diameter, k represents the width of the initial geometric defect of the pipe straightness, B represents the initial geometric defect of the pipe straightness, T represents the pipe temperature, t1 represents the pipe wall thickness in the working condition data, t2 represents the pipe wall thickness determined by the method according to the embodiment of the present application, and t3 represents the pipe wall thickness calculated according to the standard calculation formula of the pipe wall thickness.

[0172] As can be seen from Table 5, since the method according to the embodiment of the present application takes into account the influence of the pipe defect during the calculation process, when the initial geometric defect of the straightness is large and the width of the initial geometric defect of the straightness is small, t2 > t3, that is, the calculated pipe wall thickness t2 is greater than the pipe wall thickness t3 obtained according to the standard calculation formula of the pipe wall thickness; since the plastic failure of the pipe is taken into account, when the initial geometric defect of the straightness is small and the width of the initial geometric defect of the straightness is large, t2 < t3, that is, the calculated pipe wall thickness t2 is less than the pipe wall thickness t3 calculated by the standard formula considering only the elastic state. It can be seen from this that a method for determining the pipe wall thickness provided by the embodiment of the present application can comprehensively take into account the structural safety required for the pipe to transport hot medium and the economy of material use.

[0173] A method for determining the pipe wall thickness provided by the embodiment of the present application divides more finite element numbers at the initial geometric defect of the straightness of the second pipe model, improves the calculation accuracy at the pipe defect, and thus improves the accuracy of the finally determined pipe wall thickness; through the π theorem, multiple target parameters with the same dimension are arbitrarily combined to obtain multiple parameter combinations, and then according to the random forest algorithm, the importance degree of each parameter combination is determined, and the first function model is fitted through the parameter combination with the importance degree greater than or equal to the preset threshold, temperature, internal pressure, and maximum radial displacement, and the second function model is fitted through the parameter combination with the importance degree greater than or equal to the preset threshold, temperature, internal pressure, and maximum equivalent plastic strain, that is, by selecting the parameters that have a greater influence on the maximum plastic strain and the maximum radial displacement to fit the first function model and the second function model, improving the accuracy of the first function model and the second function model, and thus improving the accuracy of the finally solved minimum pipe wall thickness; a method for determining the preset maximum equivalent plastic strain is given through the steel fatigue life formula.

[0174] The embodiment of the present invention can divide the electronic device or the main control device into functional modules according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0175] Figure 5 This is a schematic diagram of a device for determining pipe wall thickness provided in an embodiment of the present application. Figure 5 As shown, the pipeline wall thickness determination device includes: a first construction module 510, a second construction module 520, a simulation module 530, a fitting module 540 and a solution module 550;

[0176] A first construction module 510 is used to construct a first simulation model by using finite element analysis software, wherein the first simulation model includes a first pipeline model and a soil model, wherein the first pipeline model is used to describe pipeline characteristics, and the soil model is used to describe soil characteristics;

[0177] The second construction module 520 is used to add the non-straightness initial geometric defect and the width of the non-straightness initial geometric defect in the first pipeline model, construct a second pipeline model including the initial defect, and construct a second simulation model according to the second pipeline model and the soil model;

[0178] The simulation module 530 is used to simulate the maximum radial displacement and the maximum equivalent plastic strain under different working condition data through the second simulation model, and the working condition data include: the internal pressure of the pipeline, the diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of the non-straightness of the pipeline, the width of the initial geometric defect of the non-straightness of the pipeline, and the temperature of the pipeline;

[0179] A fitting module 540, configured to fit a first function model according to the operating data and the maximum radial displacement, and to fit a second function model according to the operating data and the maximum equivalent plastic strain;

[0180] The solution module 550 is used to solve the minimum wall thickness of the pipeline under the preset maximum radial displacement and the preset maximum equivalent plastic strain from the first function model and the second function model.

[0181] In a possible design, in the solution module 550, the first function model is as follows:

[0182]

[0183] Where D is the pipe diameter, k is the width of the initial geometric defect of the pipe's non-straightness, t is the pipe's wall thickness, T is the pipe's temperature, B is the initial geometric defect of the pipe's non-straightness, Z is the maximum radial displacement, and a1 to a 31 and b are fitting coefficients, y1, y2 and y3 are intermediate variables;

[0184] The second function model is as follows:

[0185]

[0186] Where, is the maximum equivalent plastic strain, c1 to c 31 and d are fitting coefficients, y1, y2 and y3 are intermediate variables.

[0187] In one possible design, the solution module 550 includes: a first wall thickness module, a second wall thickness module and a selection module;

[0188] A first wall thickness module, used for solving a first minimum wall thickness of the pipeline under a preset maximum radial displacement from a first function model;

[0189] A second wall thickness module, used for solving the second minimum wall thickness of the pipeline under a preset maximum equivalent plastic strain from a second function model;

[0190] The selection module is used to select a minimum value from the first minimum wall thickness, the second minimum wall thickness and the preset minimum wall thickness as the minimum wall thickness of the pipeline.

[0191] In a possible design, in the second building module 520, the second pipeline model is a four-node model, and the parameters of the second pipeline model include at least one of the following: the tensile strength of the pipe is 370 MPa, the yield strength of the pipe is 235 MPa, the pipe diameter is within the range of 529 mm to 1420 mm, the wall thickness is within the range of 5 mm to 20 mm, the friction coefficient with the soil is 0.3, the normal contact mode with the soil is hard contact, the Poisson's ratio is 0.3, and the temperature load of the pipeline is between 40 degrees Celsius and 120 degrees Celsius;

[0192] The soil model is an eight-node hexahedron model with a length of 100 meters, a width of 4 meters, and a height of 7 meters.

[0193] The number of finite elements divided at the non-straightness initial geometric defect of the second pipeline model is greater than the number of finite elements divided at other parts of the second pipeline model.

[0194] In one possible design, the fitting module 540 includes a combining module, a determining module, a first fitting module, and a second fitting module;

[0195] A combination module is used for arbitrarily combining multiple target parameters with the same dimension to obtain multiple parameter combinations, wherein the multiple target parameters include: pipe diameter, pipe wall thickness, non-straightness initial geometric defect of the pipe and width of the non-straightness initial geometric defect of the pipe;

[0196] A determination module is used to determine the importance of each parameter combination according to a random forest algorithm;

[0197] A first fitting module, used for fitting a first function model through a parameter combination whose importance is greater than or equal to a preset threshold, as well as temperature, internal pressure, and maximum radial displacement;

[0198] The second fitting module is used to fit the second function model through a parameter combination whose importance is greater than or equal to a preset threshold, as well as temperature, internal pressure, and maximum equivalent plastic strain.

[0199] In one possible design, the solution module 550 further includes an acquisition module, a total strain module, and a difference module;

[0200] An acquisition module is used to obtain the maximum temperature action cycle number and the maximum elastic strain;

[0201] Total strain module, used to calculate the total strain of the pipeline under the maximum temperature cycle number through the steel fatigue life formula;

[0202] The difference module is used to calculate the difference between the total strain of the pipeline and the maximum elastic strain as the preset maximum equivalent plastic strain;

[0203] Among them, the steel fatigue life formula is:

[0204] ε1=0.003(2N) -0.08 +0.1559(2N) -0.462

[0205] Where N is the maximum temperature action cycle number, and ε1 is the total strain of the pipeline.

[0206] The present embodiment provides a device for determining the pipe wall thickness, which can execute a method for determining the pipe wall thickness of the above-mentioned embodiment. The implementation principle and technical effect thereof are similar, and will not be described in detail in the present embodiment.

[0207] In a specific implementation of the aforementioned device for determining the wall thickness of a pipeline, each module may be implemented as a processor, and the processor may execute computer-executable instructions stored in a memory, so that the processor executes the aforementioned method for determining the wall thickness of a pipeline.

[0208] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 6As shown, the electronic device includes: at least one processor 610 and a memory 620. The electronic device also includes a communication component 630. The processor 610, the memory 620 and the communication component 630 are connected via a bus 640.

[0209] In a specific implementation process, at least one processor 610 executes the computer execution instructions stored in the memory 620, so that at least one processor 610 executes a pipeline wall thickness determination method executed by the electronic device side as above.

[0210] The specific implementation process of the processor 610 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0211] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the invention may be directly implemented as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0212] The memory may include a high-speed RAM memory, and may also include a non-volatile storage NVM, such as at least one disk storage.

[0213] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application is not limited to only one bus or one type of bus.

[0214] The above-mentioned functions implemented by the electronic device and the main control device introduce the scheme provided by the embodiment of the present invention. It can be understood that in order to implement the above-mentioned functions, the electronic device or the main control device includes a hardware structure and / or software module corresponding to the execution of each function. In combination with the units and algorithm steps of each example described in the embodiment disclosed in the embodiment of the present invention, the embodiment of the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the technical solution of the embodiment of the present invention.

[0215] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the computer-readable storage medium is used to implement the above-mentioned method for determining the wall thickness of a pipeline.

[0216] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0217] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as: ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in an electronic device or a main control device.

[0218] The present application also provides a computer program product, which includes a computer program. The computer program is stored in a readable storage medium. At least one processor of an electronic device can read the computer program from the readable storage medium. At least one processor executes the computer program so that the electronic device executes the solution provided in any of the above embodiments.

[0219] Those skilled in the art can understand that all or part of the steps of the above method embodiments can be completed by hardware related to program instructions. The above program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above method embodiments are executed; and the above storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0220] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments, and the above embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining pipe wall thickness, characterized in that: include: Constructing a first simulation model by using finite element analysis software, wherein the first simulation model includes a first pipeline model and a soil model, wherein the first pipeline model is used to describe pipeline characteristics, and the soil model is used to describe soil characteristics; In the first pipeline model, an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness are added to construct a second pipeline model containing the initial defect, and a second simulation model is constructed according to the second pipeline model and the soil model; The maximum radial displacement and the maximum equivalent plastic strain under different working condition data are simulated by the second simulation model, and the working condition data include: the internal pressure of the pipeline, the diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of the non-straightness of the pipeline, the width of the initial geometric defect of the non-straightness of the pipeline, and the temperature of the pipeline; Fitting a first function model according to the operating condition data and the maximum radial displacement, and fitting a second function model according to the operating condition data and the maximum equivalent plastic strain; The minimum wall thickness of the pipe under a preset maximum radial displacement and a preset maximum equivalent plastic strain is solved from the first function model and the second function model.

2. The method according to claim 1, characterized in that The first function model is as follows: Wherein, D is the diameter of the pipeline, k is the width of the initial geometric defect of the non-straightness of the pipeline, t is the wall thickness of the pipeline, T is the temperature of the pipeline, B is the initial geometric defect of the non-straightness of the pipeline, Z is the maximum radial displacement, and the distance from a1 to a 31 and b are fitting coefficients, and y1, y2 and y3 are intermediate variables; The second function model is as follows: Wherein, is the maximum equivalent plastic strain, and c1 to c 31 The d is the fitting coefficient, and the y1, y2 and y3 are intermediate variables.

3. The method according to claim 1 or 2, characterized in that: The step of solving the minimum wall thickness of the pipe under a preset maximum radial displacement and a preset maximum equivalent plastic strain from the first function model and the second function model comprises: Determining the first minimum wall thickness of the pipe under a preset maximum radial displacement from the first function model; Solving the second minimum wall thickness of the pipeline under a preset maximum equivalent plastic strain from the second function model; A minimum value is selected from the first minimum wall thickness, the second minimum wall thickness and the preset minimum wall thickness as the minimum wall thickness of the pipeline.

4. The method according to claim 1 or 2, characterized in that: The second pipeline model is a four-node model, and the parameters of the second pipeline model include at least one of the following: the tensile strength of the pipe is 370 MPa, the yield strength of the pipe is 235 MPa, the pipe diameter is within 529 mm to 1420 mm, the wall thickness is within 5 mm to 20 mm, the friction coefficient with the soil is 0.3, the normal contact mode with the soil is hard contact, the Poisson's ratio is 0.3, and the temperature load of the pipeline is between 40 degrees Celsius and 120 degrees Celsius; The soil model is an eight-node hexahedron model, the length of the soil model is 100 meters, the width of the soil model is 4 meters, and the height of the soil model is 7 meters; The number of finite elements divided at the non-straightness initial geometric defect of the second pipeline model is greater than the number of finite elements divided at other parts of the second pipeline model.

5. The method according to claim 1 or 2, characterized in that: The step of fitting a first function model according to the operating condition data and the maximum radial displacement, and the step of fitting a second function model according to the operating condition data and the maximum equivalent plastic strain, comprises: For multiple target parameters with the same dimension, the multiple target parameters are arbitrarily combined to obtain multiple parameter combinations, wherein the multiple target parameters include: the diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of the non-straightness of the pipeline, and the width of the initial geometric defect of the non-straightness of the pipeline; Determine the importance of each parameter combination according to a random forest algorithm; Fitting a first function model through the parameter combination whose importance is greater than or equal to a preset threshold, the temperature, the internal pressure, and the maximum radial displacement; The second function model is fitted by using the parameter combination whose importance is greater than or equal to the preset threshold, the temperature, the internal pressure, and the maximum equivalent plastic strain.

6. The method according to claim 1 or 2, characterized in that: The preset maximum equivalent plastic strain can be predetermined by the following process: Obtain the maximum temperature action cycle number and the maximum elastic strain; The total strain of the pipeline under the maximum temperature action cycle number is calculated by the steel fatigue life formula; Calculating the difference between the total strain of the pipeline and the maximum elastic strain as the preset maximum equivalent plastic strain; Wherein, the steel fatigue life formula is: <h2 style=";text-align:left;direction:ltr">ε1 = 0.003(2N)<h2 style=";text-align:left;direction:ltr"> -0.08 <h2 style=";text-align:left;direction:ltr"> +0.1559(2N)<h2 style=";text-align:left;direction:ltr"> -0.462 Wherein, N is the maximum number of temperature action cycles, and ε1 is the total strain of the pipeline.

7. A device for determining pipe wall thickness, characterized in that: include: A first construction module is used to construct a first simulation model by using finite element analysis software, wherein the first simulation model includes a first pipeline model and a soil model, wherein the first pipeline model is used to describe pipeline characteristics, and the soil model is used to describe soil characteristics; A second construction module is used to add an initial geometric defect of non-straightness and a width of the initial geometric defect of non-straightness to the first pipeline model, construct a second pipeline model containing the initial defect, and construct a second simulation model according to the second pipeline model and the soil model; A simulation module, used for simulating the maximum radial displacement and the maximum equivalent plastic strain under different working condition data by the second simulation model, wherein the working condition data include: the internal pressure of the pipeline, the diameter of the pipeline, the wall thickness of the pipeline, the initial geometric defect of the non-straightness of the pipeline, the width of the initial geometric defect of the non-straightness of the pipeline, and the temperature of the pipeline; A fitting module, used for fitting a first function model according to the working condition data and the maximum radial displacement, and fitting a second function model according to the working condition data and the maximum equivalent plastic strain; A solution module is used to solve the minimum wall thickness of the pipeline under a preset maximum radial displacement and a preset maximum equivalent plastic strain from the first function model and the second function model.

8. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the pipeline wall thickness determination method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method for determining the pipe wall thickness according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for determining the pipe wall thickness according to any one of claims 1 to 6 is implemented.

Images