Method for determining section load of thin-wall pipeline and system for determining section load of thin-wall pipeline

Abstract

The embodiment of the invention relates to the technical field of pipeline load monitoring, in particular to a method for determining the section load of a thin-wall pipeline and a system for determining the section load of the thin-wall pipeline, and the method comprises the steps: determining a target section on the thin-wall pipeline and the positions of a plurality of strain measurement pieces at the target section, arranging a plurality of strain measuring pieces at the target section; determining strain data measured by the strain measurement pieces according to the plurality of strain measurement pieces; determining the stress of the target section according to the strain data; and determining the section load of the target section according to the stress. According to the method provided by the embodiment of the invention, the purpose of determining the section load of any section of the thin-wall pipeline in real time can be achieved by determining the position of the strain measurement piece at the target section of the thin-wall pipeline, and the section load of any section of the thin-wall pipeline is detected in real time. Abnormal stress of the pipeline caused by internal pressure, external load or temperature deformation can be determined, the safety of the thin-wall pipeline is improved, and safe operation of basic equipment is guaranteed.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of pipeline load monitoring, and in particular to a method for determining the cross-sectional load of a thin-walled pipeline and a system for determining the cross-sectional load of a thin-walled pipeline. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] Pipelines are essential industrial equipment for transporting and storing fluids, connecting metal components, and bearing the pressure of components. They are widely used in liquid and gas transmission, chemical production, food processing, and other fields, demonstrating their strong adaptability. In recent years, thin-walled pipes have been widely used in industry due to their economic advantages of light weight and low cost, as well as their excellent corrosion resistance and high strength.

[0004] However, thin-walled pipes are relatively thin, and when subjected to complex loads such as pressure, axial force, bending moment, or torque, they can experience strength or deformation failures in the pipe cross-section. For example, in nuclear island equipment, thin-walled pipes transporting high-pressure liquids or gases are subject to significant axial and hoop stresses. To ensure the safe operation of thin-walled pipes, the loads on the pipe cross-section must be properly distributed and controlled. Summary of the Invention

[0005] A brief overview of the present application is provided below to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify key or important portions of the present application, nor is it intended to limit the scope of the present application. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description that will be discussed later.

[0006] In a first aspect, an embodiment of the present application provides a method for determining the cross-sectional load of a thin-walled pipe, which includes the following steps: S1, determining a target cross-sectional area on the thin-walled pipe, and determining the positions of multiple strain measuring members at the target cross-sectional area, and then arranging the multiple strain measuring members at the target cross-sectional area; S2, determining the strain data measured by the strain measuring members based on the multiple strain measuring members arranged in step S1; S3, determining the stress of the target cross-sectional area based on the strain data determined in step S2; S4, determining the cross-sectional load of the target cross-sectional area based on the stress determined in step S3.

[0007] The method provided by the embodiment of the present application can obtain the strain data of the target section in real time by determining the target section on the thin-walled pipeline and then determining the positions of the strain measuring members on the thin-walled pipeline, and then can determine the section load of the target section based on the obtained strain data, so as to achieve the purpose of determining the section load of any section of the thin-walled pipeline in real time. Meanwhile, by detecting the section load of any section of the thin-walled pipeline in real time during the operation of the thin-walled pipeline, the stress abnormality of the thin-walled pipeline caused by the internal pressure, external load or temperature deformation can be determined based on the section load, so as to achieve the purpose of evaluating and warning the internal stress state of the thin-walled pipeline, and help to improve the safety of the thin-walled pipeline and ensure the safe operation of the pipeline equipment.

[0008] In a second aspect, the embodiment of the present application further provides a system for determining the section load of a thin-walled pipeline, comprising: a strain measuring member position determining module configured to determine a target section on the thin-walled pipeline and determine the positions of a plurality of strain measuring members at the target section, and then arrange the plurality of strain measuring members at the target section; a strain data determining module configured to determine the strain data measured by the strain measuring members according to the plurality of strain measuring members arranged by the strain measuring member position determining module; a stress determining module configured to determine the stress of the target section according to the strain data determined by the strain data determining module; and a section load determining module configured to determine the section load of the target section according to the stress determined by the stress determining module.

[0009] These and other advantages of the present application will no doubt become apparent to those of ordinary skill in the art after having read the following detailed description of the preferred embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to further illustrate the above and other advantages and features of the present application, the specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. The drawings, together with the following detailed description, are incorporated in and constitute a part of this specification. Elements having the same function and structure are denoted by the same reference signs. It should be understood that these drawings only describe typical examples of the present application and should not be regarded as limiting the scope of the present application.

[0011] Figure 1 is a flowchart of a method for determining the section load of a thin-walled pipeline according to an embodiment of the present application;

[0012] Figure 2 is a distribution diagram of the first strain measuring members at a target section according to a first embodiment of the present application;

[0013] Figure 3 is a distribution diagram of the second strain measuring members at a target section according to a first embodiment of the present application;

[0014] Figure 4 is a schematic illustration of the distribution of the second strain measuring element according to the second embodiment of the application at the target cross section.

[0015] It is noted that the drawings are not necessarily drawn to scale and that the emphasis in the drawings is on illustrating the principles of the application.

[0016] Legend for the drawings:

[0017] 10 first strain measuring element; 11 first strain measuring assembly; 12 second strain measuring assembly; 20 second strain measuring element; 21 third strain measuring assembly; 22 fourth strain measuring assembly; 30 thin-walled pipe; 31 pipe section. DETAILED DESCRIPTION

[0018] In the following, exemplary embodiments of the application will be described with reference to the drawings. In the description of the embodiments, not all of the features of the actual implementation are described in order to avoid obscuring the application with unnecessary detail. It should be appreciated that in the development of any such actual implementation, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system- and business-related constraints, which will vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill in the art having the benefit of this disclosure.

[0019] It is also noted that, in the interest of clarity and conciseness, in the drawings only those details of the device structure and / or processing steps are shown which are considered to be essential for the understanding of the application according to the application, while other details are omitted which are not essential for the understanding of the application.

[0020] It is noted that, unless otherwise defined, technical and scientific terms used in the present application should have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0021] In the description of the embodiments of the application, the term "a plurality of" means at least two, for example two, three, etc., unless otherwise defined specifically and explicitly.

[0022] In harsh working conditions, such as temperature changes, high-pressure corrosive environments, or high-frequency vibrations, the cross-sectional load of the thin-walled pipeline is prone to fluctuation, which increases the risk of local buckling, deformation, or cracking of the thin-walled pipeline. In the related art, the carrying capacity of the thin-walled pipeline is improved by extracting, analyzing and optimizing the cross-sectional load of the thin-walled pipeline to prevent fatigue failure and sudden damage of the thin-walled pipeline. However, the current method for extracting the load of the thin-walled pipeline mainly uses the finite element method. This method for extracting the load of the thin-walled pipeline cannot extract the load data of any cross section during actual operation, and thus cannot obtain the stress state of the cross section of the pipeline in real time, making it difficult to ensure the safe operation of the thin-walled pipeline.

[0023] To solve the above technical problems, the embodiments of the present application provide a method for determining the cross-sectional load of a thin-walled pipeline. Figure 1 is a flowchart of the method for determining the cross-sectional load of the thin-walled pipeline according to the embodiments of the present application, as Figure 1 shown, the method comprises at least the following steps S1 to S4.

[0024] S1, determine a target cross section on the thin-walled pipeline, and determine the positions of a plurality of strain measuring elements at the target cross section, and then arrange a plurality of strain measuring elements at the target cross section.

[0025] S2, determine the strain data measured by the strain measuring elements according to the plurality of strain measuring elements arranged in S1.

[0026] S3, determine the stress of the target cross section according to the strain data determined in S2.

[0027] S4, determine the cross-sectional load of the target cross section according to the stress determined in S3.

[0028] The method provided by the embodiments of the present application can obtain the strain data of the target cross section in real time by determining the target cross section on the thin-walled pipeline and then determining the positions of the strain measuring elements on the thin-walled pipeline. Then, based on the obtained strain data, the cross-sectional load of the target cross section can be determined to achieve the purpose of determining the cross-sectional load of any cross section of the thin-walled pipeline in real time. At the same time, by detecting the cross-sectional load of any cross section of the thin-walled pipeline in real time during the operation of the thin-walled pipeline, the stress abnormality caused by internal pressure, external load or temperature deformation of the pipeline can be determined based on the cross-sectional load, which achieves the purpose of evaluating the internal stress state of the thin-walled pipeline and fault warning, and helps to improve the safety of the thin-walled pipeline and ensure the safe operation of the pipeline equipment.

[0029] In some embodiments, the target section can be any section of the thin-walled pipeline for which the cross-sectional load needs to be determined. In such embodiments, when the strain measuring element is arranged at the target section, a pipe section with a predetermined width can be determined at the target section, and then the strain measuring element is arranged on the outer surface of the pipe section. It can be understood that the width of the pipe section can meet the arrangement requirement of the strain measuring element.

[0030] In some embodiments, the strain measuring element in the embodiments of the present application can be any component capable of measuring the surface stress of the thin-walled pipeline, and the present application does not limit this.

[0031] In some embodiments, in the S2 step, the strain data in the embodiments of the present application at least includes the axial strain data and / or the circumferential strain data of the target section.

[0032] In some embodiments, in the S4 step, the cross-sectional load of the target section determined in the embodiments of the present application at least includes any one or more of the axial force, the bending moment, the shear force, and the torque of the target section.

[0033] In some embodiments, in the S1 step, at least the following steps are included: arranging a plurality of first strain measuring elements at the target section along the axial direction of the thin-walled pipeline; wherein the strain data includes the axial strain data, and the number of the plurality of first strain measuring elements is greater than or equal to 3.

[0034] The method provided by the embodiments of the present application can measure the axial strain data of the target section by arranging a plurality of first strain measuring elements at the target section along the axial direction of the thin-walled pipeline, and thus the purpose of determining the stress of the target section is achieved.

[0035] It can be understood that the target section refers to the outer surface of the part of the thin-walled pipeline at the location of the target section.

[0036] In some embodiments, the first strain measuring element can be fixed on the outer surface of the thin-walled pipeline in any manner, and the present application does not limit this.

[0037] In some embodiments, arranging a plurality of first strain measuring elements at the target section along the axial direction of the thin-walled pipeline includes the following steps: arranging the plurality of first strain measuring elements in such a manner that the line connecting any two first strain measuring elements in the plurality of first strain measuring elements is perpendicular to the axial direction.

[0038] The method provided by the embodiments of the present application can arrange the plurality of first strain measuring elements at the target section of the thin-walled pipeline in the above-mentioned arrangement manner, can measure the axial strain data of the target section by each first strain measuring element, avoid the interference of the circumferential strain data or other factors, and is conducive to improving the accuracy of the subsequently determined stress.

[0039] In some embodiments, Figure 2 is a schematic diagram of the distribution of the first strain measuring element according to the embodiments of the present application at the target section, as Figure 2 shown, a part of the pipe section 31 can be determined according to the position where the target section of the thin-walled pipeline 30 is located, two first strain measuring elements 10 are arranged symmetrically on the surface of the pipe section 31 along the target section with the axial direction of the thin-walled pipeline 30 as the reference, and the included angle between the two first strain measuring elements 10 is 180°, and then one or more first strain measuring elements 10 are arranged at other positions. In such embodiments, the two first strain measuring elements 10 with an included angle of 180° are referred to as a first strain measuring assembly 11, and one first strain measuring element 10 arranged at other positions is referred to as a second strain measuring assembly 12.

[0040] In some embodiments, for any strain measuring element, the line connecting the center of the strain measuring element and the axis of the thin-walled pipeline can be referred to as the positioning line of the strain measuring element for the convenience of description and understanding. In such embodiments, the included angle between any two strain measuring elements is the included angle between the positioning line of one strain measuring element and the positioning line of the other strain measuring element.

[0041] It can be understood that when arranging the first strain measuring element (or the second strain measuring element in the following embodiments), the arrangement direction of the first strain measuring element on the thin-walled pipeline can be any direction, and the present application does not limit this.

[0042] In some embodiments, in the S4 step, at least the following steps are included: S41, stress decoupling according to the axial strain data; S42, determining the axial force and the bending moment of the target section according to the decoupled stress.

[0043] The method provided by the embodiments of the present application can reduce the mutual interference between the axial force and the bending moment by decoupling the stress determined according to the axial strain data, improve the accuracy of subsequent calculation, and thus can simply and quickly determine the axial force and the bending moment of the target section, and the calculation result is relatively reliable.

[0044] In some embodiments, as Figure 2 shown, when determining the bending moment of the target section, or determining the bending moment and the axial force of the target section, four first strain measuring elements 10 can be arranged symmetrically and orthogonally at the target section of the thin-walled pipeline 30 with the axial direction of the thin-walled pipeline 30 as the reference, and the included angle between every two adjacent first strain measuring elements 10 is 90°.

[0045] In Figure 2In the illustrated embodiment, any two symmetrically arranged first strain measuring members 10 of the four first strain measuring members 10 can serve as a first strain measuring assembly 11, and the other two first strain measuring members 10 can serve as a second strain measuring assembly 12, respectively.

[0046] In some embodiments, the axial strain data and the stress satisfy the following relationship (1):

[0047] σ = Eε (1).

[0048] Wherein, σ represents the stress; ε represents the axial strain data; E represents the elastic modulus of the material of the thin-walled pipeline.

[0049] In some embodiments, when determining the axial force at the target section, the stress determined according to the axial strain data measured by the first strain measuring assembly corresponding to the target section can be decoupled. In such embodiments, in the process of decoupling, the stresses corresponding to the axial strain data measured by the two first strain measuring members in the first strain measuring assembly can be determined respectively, and then the sum of the two stresses is divided by 2 to obtain the decoupled axial force.

[0050] In some embodiments, when determining the bending moment at the target section, the stresses determined according to the axial strain data measured by the first strain measuring assembly and the second strain measuring assembly corresponding to the target section can be decoupled. In such embodiments, in the process of decoupling, the stresses corresponding to the axial strain data measured by the first strain measuring assembly and the second strain measuring assembly can be determined respectively, and then the difference between the two stresses is divided by 2 to obtain the decoupled axial force, and then the bending moment at the target section is determined according to the decoupled axial force.

[0051] In some embodiments, the stress determined according to the axial strain data and the axial force satisfy the following relationship (2):

[0052] F = 2πR0tσ (2).

[0053] Wherein, F represents the axial force; R0 represents the equivalent radius of the thin-walled pipeline, t represents the wall thickness of the thin-walled pipeline, and σ represents the stress.

[0054] In some embodiments, in the S42 step, the stress determined according to the axial strain data and the bending moment satisfy the following relationship (3):

[0055]

[0056] Wherein, M represents the bending moment; I zrepresents the moment of inertia; z represents the neutral axis of the thin-walled pipeline; σ1 represents the stress determined according to the axial strain data; θ represents the included angle between the positions of the plurality of first strain measuring elements on the thin-walled pipeline and the neutral axis of the thin-walled pipeline; and R0 represents the equivalent radius of the thin-walled pipeline.

[0057] The method provided by the embodiment of the present application determines the bending moment by using the above relationship, without complex calculation, so as to improve the calculation efficiency of the bending moment, thereby achieving the purpose of monitoring the cross-section load of the target cross-section of the thin-walled pipeline in real time.

[0058] In some embodiments, the positions of the plurality of first strain measuring elements on the thin-walled pipeline can be represented by a line connecting two first strain measuring elements in the first strain measuring assembly and / or a line connecting two first strain measuring elements in the second strain measuring assembly.

[0059] In some embodiments, the included angle between the positions of the plurality of first strain measuring elements on the thin-walled pipeline and the neutral axis of the thin-walled pipeline and the stress determined according to the axial strain data satisfy the following relationship (4):

[0060]

[0061] wherein θ represents the included angle between the positions of the plurality of first strain measuring elements on the thin-walled pipeline and the neutral axis of the thin-walled pipeline; σ1 represents the stress determined according to the axial strain data measured by the first strain measuring assembly; and σ2 represents the stress determined according to the axial strain data measured by the second strain measuring assembly.

[0062] It can be understood that in the relationship (3), σ1 represents the stress determined according to the axial strain data, and the axial strain data here is the axial strain data measured by the first strain measuring assembly.

[0063] In some embodiments, in the S1 step, the method further comprises the following step: arranging a plurality of second strain measuring elements at the target cross-section along the circumferential direction of the thin-walled pipeline; wherein the strain data further comprises circumferential strain data, and the number of the plurality of second strain measuring elements is greater than or equal to 3.

[0064] The method provided by the embodiment of the present application can measure the radial strain data of the target cross-section by using each second strain measuring element by arranging a plurality of second strain measuring elements at the target cross-section along the circumferential direction of the thin-walled pipeline, thereby achieving the purpose of determining the stress of the target cross-section.

[0065] In some embodiments, the second strain measuring element can be fixed to the target cross-section of the thin-walled pipeline in any manner, which is not limited in the present application.

[0066] In some embodiments, a plurality of second strain measuring members are arranged at a target cross section along a circumferential direction of the thin-walled pipe, including: arranging the plurality of second strain measuring members in such a manner that a line connecting any two of the plurality of second strain measuring members is perpendicular to an axial direction of the thin-walled pipe.

[0067] The method provided in the embodiment of the present application can use each second strain measuring element to measure the circumferential strain data at the target cross section through the above-mentioned setting method of the second strain measuring element, avoiding interference from axial strain data or other factors, which is conducive to improving the accuracy of the subsequently determined stress.

[0068] In some embodiments, Figure 3 is a schematic diagram of the distribution of the second strain measuring element at the target cross section according to the first embodiment of the present application, as shown in FIG. Figure 3 As shown, a portion of the pipe section can be determined according to the location of the target cross section of the thin-walled pipe 30. With the axial direction of the thin-walled pipe 30 as a reference, two second strain measuring elements 20 are symmetrically arranged along the circumferential direction, with the angle between the two second strain measuring elements 20 being 180°. Then, one or more second strain measuring elements ( Figure 3 (not shown). In such an embodiment, the two second strain measurement elements 20 with an included angle of 180° are hereinafter referred to as the third strain measurement assembly 21, and the second strain measurement elements 20 arranged at other positions and any one of the two second strain measurement elements 20 with an included angle of 180° are hereinafter referred to as the fourth strain measurement assembly.

[0069] In some embodiments, Figure 4 : is a schematic diagram of the distribution of the second strain measuring element at the target cross section according to the second embodiment of the present application, such as Figure 4 As shown, when determining the shear force, torque, or shear force of the target cross-section, four second strain measuring members 20 can be evenly arranged along the circumferential direction of the target cross-section of the thin-walled pipe 30, with the axial direction of the thin-walled pipe 30 as a reference, with the angle between every two adjacent second strain measuring members 20 being 90°, and the second strain measuring members 20 being symmetrically distributed along the center of the cross-section.

[0070] exist Figure 4 In the illustrated embodiment, any two symmetrically arranged second strain measuring elements 20 among the four second strain measuring elements 20 can serve as the third strain measurement assembly 21, and the other two second strain measuring elements 20 and any one of the second strain measuring elements 20 in the third strain measurement assembly 21 respectively serve as the fourth strain measurement assembly 22.

[0071] In some embodiments, in the step S4, the following steps are further included: S43, decoupling the stress determined according to the circumferential strain data; S44, determining the shear force and the torque of the target section according to the decoupled stress.

[0072] The method provided by the embodiments of the present application can reduce the mutual interference between the shear force and the torque, improve the accuracy of subsequent calculation, and thus can simply and quickly determine the shear force and the torque of the target section, and the calculation result is relatively reliable.

[0073] In some embodiments, the stress determined according to the circumferential strain data and the circumferential strain data satisfy the following relationship (5):

[0074]

[0075] Wherein, τ represents the stress determined according to the circumferential strain data; ε' represents the circumferential strain data; E represents the elastic modulus of the material of the thin-walled pipeline; and μ represents the Poisson's ratio of the material of the thin-walled pipeline.

[0076] In some embodiments, when determining the torque at the target section of the thin-walled pipeline, the stress determined according to the circumferential strain data measured by the third strain measurement assembly corresponding to the target section can be decoupled. In such embodiments, in the process of decoupling, the stresses corresponding to the circumferential strain data measured by the two second strain measurement members in the third strain measurement assembly can be determined respectively, and then the two stresses are summed and divided by 2 to obtain the decoupled shear force.

[0077] In some embodiments, when determining the bending moment at the target section of the thin-walled pipeline, the stress determined according to the circumferential strain data measured by the third strain measurement assembly and the fourth strain measurement assembly corresponding to the target section can be decoupled. In such embodiments, in the process of decoupling, the stresses corresponding to the circumferential strain data measured by the third strain measurement assembly and the fourth strain measurement assembly can be determined respectively, and then the two stresses are subtracted and divided by 2 to obtain the decoupled shear force, and then the bending moment at the target section is determined according to the obtained shear force.

[0078] In some embodiments, the torque determined according to the decoupled stress and the decoupled stress satisfy the following relationship (6):

[0079] T=2πτR0 2 t (6)。

[0080] Wherein, T represents the wall thickness of the thin-walled pipeline; R0 represents the equivalent radius of the thin-walled pipeline; t represents the wall thickness of the thin-walled pipeline; and τ represents the stress determined according to the circumferential strain data.

[0081] In some embodiments, in the step S44, the stress determined according to the circumferential strain data and the shear force satisfy the following relationship (7):

[0082]

[0083] wherein F s represents the shear force; R0 represents the equivalent radius of the thin-walled pipeline; t represents the wall thickness of the thin-walled pipeline; τ1 represents the stress determined according to the circumferential strain data; represents the angle between the positions of the plurality of second strain measuring members on the thin-walled pipeline and the neutral axis of the thin-walled pipeline.

[0084] In the embodiments of the present application, the shear force is determined by the above relationship, which is advantageous to reduce the coupling error and improve the accuracy and reliability of the calculated shear force.

[0085] In some embodiments, the angle between the positions of the plurality of second strain measuring members on the thin-walled pipeline and the neutral axis of the thin-walled pipeline and the decoupled stress satisfy the following relationship (8):

[0086]

[0087] wherein, represents the angle between the positions of the plurality of second strain measuring members on the thin-walled pipeline and the neutral axis of the thin-walled pipeline; τ1 represents the shear force determined according to the circumferential strain data measured by the third strain measuring assembly; τ2 represents the shear force determined according to the circumferential strain data measured by the fourth strain measuring assembly.

[0088] It can be understood that in the relationship (7), τ1 represents the stress determined according to the circumferential strain data, and the circumferential strain data here is the circumferential strain data measured by the third strain measuring assembly.

[0089] In some embodiments, the positions of the plurality of second strain measuring members on the thin-walled pipeline can be represented by the connecting line between two second strain measuring members in the third strain measuring assembly and / or the connecting line between two second strain measuring members in the fourth strain measuring assembly.

[0090] The embodiment of the application further provides a system for determining the cross-section load of a thin-walled pipeline, comprising: a strain gauge position determining module configured to determine a target cross-section on the thin-walled pipeline and determine the positions of a plurality of strain gauges at the target cross-section, and then arrange the plurality of strain gauges at the target cross-section; a strain data determining module configured to determine the strain data measured by the strain gauges according to the plurality of strain gauges arranged by the strain gauge position determining module; a stress determining module configured to determine the stress of the target cross-section according to the strain data determined by the strain data determining module; and a cross-section load determining module configured to determine the cross-section load of the target cross-section according to the stress determined by the stress determining module.

[0091] The system provided by the embodiment of the application can obtain the strain data of the target cross-section in real time by determining the target cross-section on the thin-walled pipeline and then determining the positions of the strain gauges on the thin-walled pipeline, and then can determine the cross-section load of the target cross-section based on the obtained strain data, so as to achieve the purpose of determining the cross-section load of any cross-section of the thin-walled pipeline in real time. Meanwhile, by detecting the cross-section load of any cross-section of the thin-walled pipeline in real time during the operation of the thin-walled pipeline, the stress abnormality caused by the deformation of the pipeline due to internal pressure, external load or temperature can be determined based on the cross-section load, so as to achieve the purpose of evaluating and warning the internal stress state of the thin-walled pipeline, and help to improve the safety of the thin-walled pipeline and ensure the safe operation of the pipeline equipment.

[0092] The process of determining the cross-section load of the thin-walled pipeline by using the method provided by the embodiment of the application will be described in detail below according to a specific embodiment.

[0093] In the embodiment of the application, the operation of determining the cross-section load of the target cross-section of the thin-walled pipeline comprises the following steps:

[0094] Step 1: The strain gauge position determining module is used to determine the positions of the strain gauges at the target cross-section of the thin-walled pipeline, and then the first strain gauge and the second strain gauge are pasted on the outer surface of the thin-walled pipeline along the axial direction and the circumferential direction of the thin-walled pipeline.

[0095] Step 2: The strain data determining module is used to determine the strain data measured by the first strain gauge and the second strain gauge respectively.

[0096] Step 3: The stress determining module is used to determine the stress at the target cross-section according to the strain data measured by the strain gauges based on the Hooke's law.

[0097] Step 4: The cross-section load determining module is used to determine the stress of the target cross-section according to the strain gauges pasted in the axial direction, and then determine the axial force and the bending moment of the target cross-section; and determine the stress of the target cross-section according to the strain gauges pasted in the circumferential direction, and then determine the shear force and the torque of the target cross-section.

[0098] In the embodiments of the present application, the axial pasted strain measuring element in step 1 is the plurality of first strain measuring elements in the foregoing embodiments, and four first strain measuring elements are uniformly arranged in the axial direction of the thin-walled pipe in a symmetrical and orthogonal manner, and the included angle between every two adjacent first strain measuring elements is 90°. The circumferential pasted strain measuring element in step 1 is the plurality of second strain measuring elements in the foregoing embodiments, and four second strain measuring elements are uniformly arranged in the circumferential direction of the thin-walled pipe in a symmetrical and orthogonal manner, and the included angle between every two adjacent second strain measuring elements is 90°.

[0099] In the embodiments of the present application, the material of the thin-walled pipe is structural steel, the outer wall radius of the thin-walled pipe is 21 mm, the inner wall radius is 20 mm, the equivalent radius is 20.5 mm, and the wall thickness is 1 mm. The stress determined by the strain data measured by the plurality of first strain measuring elements and the plurality of second strain measuring elements is shown in Table 1.

[0100] Table 1 Strain data measured by the plurality of first strain measuring elements and the plurality of second strain measuring elements

[0101] First strain gauge position Stress (MPa) Second strain gauge position Stress (MPa) First strain gauge 1 -19.722 Second strain gauge 1 -2.7434 First strain gauge 2 39.178 Second strain gauge 2 -2.7438 First strain gauge 3 34.92 Second strain gauge 3 -1.1825 First strain gauge 4 -23.648 Second strain gauge 4 -1.183

[0102] In the embodiments of the present application, according to the stress shown in Table 1, the cross-sectional load of the target section is shown in Table 2.

[0103] Table 2 Cross-sectional load of the target section determined according to the stress

[0104]

[0105] In the embodiments of the present application, the cross-sectional load of the target section determined according to the finite element method in the related art is shown in Table 3.

[0106] Table 3 Cross-sectional load of the target section determined according to the finite element method in the related art

[0107]

[0108] It can be known from Tables 1 to 3 that, on the target section of the thin-walled pipe, by comparing the cross-sectional load determined by the method of the embodiments of the present application with the cross-sectional load determined by the finite element method, it can be known that the difference between the cross-sectional load of the target section determined by the method of the embodiments of the present application and the real result of the cross-sectional load determined by the finite element method is small, and therefore, the method provided by the embodiments of the present application can be effectively applied to the extraction of the cross-sectional load of any section of an actual thin-walled pipe.

[0109] Further, the real-time cross-section load data obtained by the method for determining the cross-section load of the target cross-section can be used to improve the design of subsequent pipelines, for example, analyzing the dynamic load distribution of the cross-section of the thin-walled pipeline caused by fluid vibration, assisting the structural optimization and resonance suppression of the thin-walled pipeline, realizing the optimization feedback of the thin-walled pipeline structure design, reducing the redundant design in the design process, and improving the overall design efficiency and safety of the thin-walled pipeline.

[0110] For the embodiments of the present application, it also needs to be explained that, in the case of no conflict, the embodiments and the features in the embodiments of the present application can be combined with each other to obtain new embodiments.

[0111] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for determining the cross-sectional load of a thin-walled pipe, characterized in that: It includes the following steps: S1. Determine a target cross-section on the thin-walled pipe, determine positions of a plurality of strain measuring elements at the target cross-section, and then arrange the plurality of strain measuring elements at the target cross-section; S2. Determining strain data measured by the strain measuring members according to the plurality of strain measuring members arranged in step S1; S3. Determine the stress of the target cross section according to the strain data determined in step S2; S4. Determine the cross-sectional load of the target cross-section according to the stress determined in step S3.

2. The method according to claim 1, characterized in that In step S1, the following steps are included: Arranging a plurality of first strain measuring members at the target cross section along the axial direction of the thin-walled pipe; The strain data includes axial strain data, and the number of the plurality of first strain measuring elements is greater than or equal to 3.

3. The method according to claim 2, characterized in that Arranging a plurality of first strain measuring members at the target cross section along the axial direction of the thin-walled pipe comprises the following steps: The plurality of first strain measurement elements are arranged such that a line connecting any two of the plurality of first strain measurement elements is perpendicular to the axial direction.

4. The method according to claim 3, characterized in that In step S4, the following steps are included: S41, decoupling the stress determined according to the axial strain data; S42. Determine the axial force and bending moment of the target section according to the decoupled stress.

5. The method according to claim 4, characterized in that In step S4, The stress and the bending moment determined according to the axial strain data meet the following relationship: Wherein, M represents the bending moment; I z represents the moment of inertia; z represents the neutral axis of the thin-walled pipe; σ1 represents the stress determined according to the axial strain data; θ represents the angle between the positions of the plurality of first strain measuring members on the thin-walled pipe and the neutral axis of the thin-walled pipe; R0 represents the equivalent radius of the thin-walled pipe.

6. The method according to any one of claims 1 to 5, characterized in that In step S1, the following steps are also included: Arranging a plurality of second strain measuring members at the target cross section along the circumferential direction of the thin-walled pipe; The strain data further includes circumferential strain data, and the number of the plurality of second strain measuring elements is greater than or equal to 3.

7. The method according to claim 6, characterized in that Arranging a plurality of second strain measuring members at the target cross section along the circumferential direction of the thin-walled pipe includes: The plurality of second strain measuring members are arranged in such a manner that a line connecting any two of the plurality of second strain measuring members is perpendicular to the axial direction of the thin-walled pipe.

8. The method according to claim 6, characterized in that In step S4, the following steps are also included: S43, decoupling the stress determined according to the circumferential strain data; S44. Determine the shear force and torque of the target section according to the decoupled stress.

9. The method according to claim 8, characterized in that In step S4, the stress and the shear force determined based on the circumferential strain data meet the following relationship: Among them, F s represents the shear force; R0 represents the equivalent radius of the thin-walled pipe; t represents the wall thickness of the thin-walled pipe; τ1 represents the stress determined according to the circumferential strain data; represents the angle between the positions of the plurality of second strain measuring members on the thin-walled pipe and the neutral axis of the thin-walled pipe.

10. A system for determining cross-sectional loads of thin-walled pipes, characterized in that: It includes: a strain measuring element position determination module configured to determine a target cross-section on the thin-walled pipe, determine positions of a plurality of strain measuring elements at the target cross-section, and then arrange the plurality of strain measuring elements at the target cross-section; a strain data determination module configured to determine strain data measured by the strain measurement elements according to the plurality of strain measurement elements arranged by the strain measurement element position determination module; a stress determination module, configured to determine the stress of the target cross section according to the strain data determined by the strain data determination module; The cross-sectional load determination module is configured to determine the cross-sectional load of the target cross-sectional area according to the stress determined by the stress determination module.

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