CN112287496B - Method, device and equipment for determining pipeline strain and stress - Google Patents
Method, device and equipment for determining pipeline strain and stress Download PDFInfo
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Abstract
The embodiment of the specification provides a method, a device and equipment for determining pipeline strain and stress. The method comprises the steps of obtaining three-dimensional coordinate data corresponding to a straight pipe section center line; the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line; projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions to obtain projection data of the straight pipe section in different directions; calculating the bending curvature of each coordinate point on the central line of the straight pipe section based on the projection data of the straight pipe section in different directions; and determining the strain and stress of each coordinate point on the central line of the straight pipe section in the target pipeline according to the bending curvature. The three-dimensional shape of the pipeline can be accurately described by utilizing the embodiment of the specification, so that the calculated stress strain of the pipeline is more accurate.
Description
Technical Field
The application relates to the technical field of oil and gas pipeline safety, in particular to a method, a device and equipment for determining pipeline strain and stress.
Background
Oil and gas pipelines are important means for transporting oil and gas. In recent years, pipeline transportation has the advantages of high efficiency, cost saving, convenient transportation, high land utilization rate, small environmental pollution and the like, so that the pipeline transportation is rapidly developed. According to statistics, the total mileage of onshore oil and gas pipelines in China is over 12 kilometers by 2016 years, and large-scale construction is still carried out. However, due to decades of continuous operation, most oil and gas pipelines have been gradually aged, and potential hazards are prevalent. If the pipeline is subjected to large strain and even breaks, serious economic loss and environmental pollution can be caused. Therefore, it is becoming increasingly important to measure the strain state of an oil and gas pipeline to assess the operating state of the pipeline.
In the prior art, an internal detector is mainly used for carrying a gyroscope and an accelerometer to measure the rotation angular velocity and the motion acceleration of an object in three directions so as to calculate the strain of an oil-gas pipeline. However, since most of the oil and gas pipelines are buried underground, the bending condition of the pipelines cannot be accurately grasped in such a way, so that the three-dimensional shape of the pipelines cannot be accurately described, and the calculated stress strain of the pipelines cannot be accurate.
Therefore, there is a need for a solution to the above technical problems.
Disclosure of Invention
The embodiment of the specification provides a method, a device and equipment for determining pipeline stress and strain, which can accurately describe the three-dimensional shape of a pipeline and enable the calculated pipeline stress and strain to be more accurate.
The method, the device and the equipment for determining the strain and the stress of the pipeline are realized in the following mode.
A method of determining pipe strain and stress, comprising: acquiring three-dimensional coordinate data corresponding to the straight pipe section central line; the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line; projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions to obtain projection data of the straight pipe section in different directions; calculating the bending curvature of each coordinate point on the central line of the straight pipe section based on the projection data of the straight pipe section in different directions; and determining the strain and stress of each coordinate point on the central line of the straight pipe section in the target pipeline according to the bending curvature.
An apparatus for determining pipe strain and stress, comprising: the three-dimensional coordinate data acquisition module is used for acquiring three-dimensional coordinate data corresponding to the center line of the straight pipe section; the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line; the projection module is used for projecting the three-dimensional coordinate data corresponding to the central line of the straight pipe section in different directions to obtain projection data of the straight pipe section in different directions; the calculation module is used for calculating the bending curvature of each coordinate point on the central line of the straight pipe section based on the projection data of the straight pipe section in different directions; and the determining module is used for determining the strain and the stress of each coordinate point on the central line of the straight pipe section in the target pipeline according to the bending curvature.
An apparatus for determining pipe strain and stress comprising a processor and a memory for storing processor-executable instructions which, when executed by the processor, perform the steps of any one of the method embodiments of the present specification.
The specification provides a method, a device and equipment for determining pipeline strain and stress. In some embodiments, the calculated stress-strain of the pipeline can be more accurate by removing the elbow coordinate data from the coordinate data corresponding to the centerline of the target pipeline and further describing the three-dimensional shape of the pipeline by using the coordinate data of the straight pipe section. By projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions and processing the coordinate points by using a fitting method, the coordinate error caused by the accuracy problem of a detection instrument can be effectively reduced, the obtained function can more accurately simulate a three-dimensional model of the pipeline, the stress-strain calculation is more in line with the actual situation, and theoretical support is provided for the excavation and repair of the oil and gas pipeline. By adopting the embodiment provided by the specification, the three-dimensional shape of the pipeline can be accurately described, so that the calculated stress strain of the pipeline is more accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the specification, are incorporated in and constitute a part of this specification, and are not intended to limit the specification. In the drawings:
FIG. 1 is a schematic flow diagram of one embodiment of a method of determining pipeline strain and stress provided herein;
FIG. 2 is a schematic flow chart diagram of one embodiment of a method of determining strain and stress in a pipeline provided herein;
FIG. 3 is a schematic representation of three-dimensional coordinate data for a centerline of a pipeline as provided herein;
FIG. 4 is a schematic diagram of horizontal projection data before and after fitting provided herein;
FIG. 5 is a schematic before and after fitting of vertical projection data provided herein;
FIG. 6 is a block diagram of one embodiment of an apparatus for determining pipe strain and stress provided herein;
FIG. 7 is a block diagram of the hardware architecture of one embodiment of a server for determining pipeline strains and stresses provided by the present specification.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments in the present specification, and not all of the embodiments. All other embodiments that can be obtained by a person skilled in the art on the basis of one or more embodiments of the present description without inventive step shall fall within the scope of protection of the embodiments of the present description.
The following describes an embodiment of the present disclosure with a specific application scenario as an example. Specifically, fig. 1 is a schematic flow chart diagram of one embodiment of a method for determining pipeline strain and stress provided herein. Although the present specification provides the method steps or apparatus structures as shown in the following examples or figures, more or less steps or modules may be included in the method or apparatus structures based on conventional or non-inventive efforts.
One embodiment provided by the present specification can be applied to a client, a server, and the like. The client may include a terminal device, such as a smart phone, a tablet computer, and the like. The server may include a single computer device, or may include a server cluster formed by a plurality of servers, or a server structure of a distributed system, and the like.
It should be noted that the following description of the embodiments does not limit the technical solutions in other extensible application scenarios based on the present specification. Detailed description of the preferred embodimentsfor one embodiment of a method of determining strain and stress in a pipe as provided herein, as illustrated in fig. 1, the method may include the following steps.
S0: acquiring three-dimensional coordinate data corresponding to the straight pipe section central line; and the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line.
In this specification, the three-dimensional coordinate data corresponding to the straight pipe section center line may be obtained based on the three-dimensional geodetic coordinates of the target pipe. The target pipe may be any pipe for which stress-strain state evaluation is required.
In some implementations, the three-dimensional geodetic coordinates of the target pipe may be obtained from the internal inspection data. The internal detection data can comprise pipeline endpoint geodetic coordinates, pipe segment endpoint geodetic coordinates, pipeline center line geodetic coordinates, pipeline elbow geodetic coordinates, pipe segment pipeline outer diameters, coordinate point numbers on the center line, pipeline girth weld joint numbers and the like. A pipeline is understood to be a line connecting coordinate points of the centerline of a pipe, which can be used to represent the orientation and behavior of the pipe. The pipe may comprise pipe sections, bends, etc. The pipeline may comprise one or more pipe segments. The pipe section may comprise a straight pipe section. The pipeline centre line is understood to be the line connecting the axis of the pipeline, i.e. the centre of the pipeline cross section. One or more coordinate points may be included on the centerline. In some implementation scenarios, the internal detection data may be pre-stored in the database, so that the internal detection data may be directly obtained from the database when the stress-strain state of the pipeline needs to be evaluated, thereby improving the evaluation efficiency.
When the curvature of the pipeline is calculated, the coordinate point where the elbow is located has a large influence on the coordinate point near the elbow. In some implementation scenarios, in order to eliminate the influence of the elbow on the calculation of the curvature of the pipeline, the elbow coordinate data may be removed from the coordinate data corresponding to the center line of the target pipeline to obtain the three-dimensional coordinate data corresponding to the center line of the straight pipeline section. Therefore, the three-dimensional shape of the pipeline is described by removing the elbow data and aiming at the coordinate data of the straight pipe section subsequently, and the calculated stress strain of the pipeline can be more accurate.
In some implementation scenarios, the three-dimensional coordinate data corresponding to the straight tube segment centerline may include data corresponding to a plurality of coordinate points. Wherein the data corresponding to each coordinate point may be represented as (x, y, z), where x represents the abscissa, y represents the ordinate, and z represents the elevation.
S2: and projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions to obtain projection data of the straight pipe section in different directions.
In the embodiment of the present description, after the three-dimensional coordinate data corresponding to the center line of the straight tube section is obtained, the three-dimensional coordinate data may be projected in different directions to obtain projection data of the straight tube section in different directions.
In some embodiments, the projecting the three-dimensional coordinate data corresponding to the straight tube section center line in different directions to obtain projection data of the straight tube section in different directions may include: projecting the three-dimensional coordinate data corresponding to the central line of the straight pipe section in the horizontal direction to obtain projection data of the straight pipe section on the horizontal plane; and projecting the three-dimensional coordinate data corresponding to the central line of the straight pipe section in the vertical direction to obtain the projection data of the straight pipe section on the vertical surface.
In some embodiments, the projecting the three-dimensional coordinate data corresponding to the straight tube section center line in the vertical direction to obtain the projection data of the straight tube section on the vertical plane may include: fitting the coordinate data of each continuous preset number of coordinate points in the projection data of the straight pipe section on the horizontal plane by using a least square method to obtain a first fitted straight line; wherein the preset number is an odd number; obtaining fitting coordinate data corresponding to the continuous preset number of coordinate points based on a function corresponding to the first fitting straight line; calculating the distance between the fitting coordinate data and the fitting coordinate data of the first coordinate point in the continuous preset number of coordinate points; and obtaining projection data of the straight pipe section on the vertical surface based on the three-dimensional coordinate data, the fitting coordinate data and the distance between the fitting coordinate data of the first coordinate point in the continuous preset number of coordinate points. Wherein, the continuous preset number of coordinate points may be 5, 7, etc. Since the more the number of points, the more the curvature of the intermediate point is affected by the surrounding points, the optimal selection can be specifically performed according to the actual scene. In the embodiment of the present specification, an example is given by taking every 5 continuous preset number of coordinate points as an example, and other implementation scenarios are similar and are not described again.
For example, in some implementation scenarios, the three-dimensional coordinate data corresponding to the central line of the straight tube section is projected in the vertical direction, and when the projection data of the straight tube section on the vertical plane is obtained, the least square method may be used to fit every five continuous coordinate points in the coordinate points projected on the horizontal plane to obtain a straight line and a linear function corresponding to the straight line, and then a new coordinate point corresponding to the five coordinate points after fitting is obtained based on the linear function, such as (x) new coordinate points 1 ,y 1 ) The corresponding new coordinate point after fitting is (x' 1 ,y′ 1 )，(x 2 ,y 2 ) The corresponding new coordinate point after fitting is (x' 2 ,y′ 2 ) And so on. After obtaining the new coordinate points, a distance may be calculated from each new coordinate point to a first new coordinate point, e.g., the first new coordinate point is (x' 1 ,y′ 1 ) Then (x' 1 ,y′ 1 ) To (x' 1 ,y′ 1 ) Is recorded as l 1 ，(x′ 2 ,y′ 2 ) To (x' 1 ,y′ 1 ) Is recorded as l 2 And the like. Further, projection data of five coordinate points on a vertical plane, such as a plane having a projection coordinate of (l), may be obtained based on three-dimensional coordinate data of the coordinate points 1 ,z 1 )、(l 2 ,z 2 )、(l 3 ,z 3 )、(l 4 ,z 4 )、(l 5 ,z 5 ) And the like. Wherein the distance from each new coordinate point to the first new coordinate point may beIn what is known as the centerline elevation of the pipe versus the abscissa. The three-dimensional coordinate data corresponding to the straight pipe section central line is (x) 1 ,y 1 ,z 1 )、(x 2 ,y 2 ,z 2 )、(x 3 ,y 3 ,z 3 )、(x 4 ,y 4 ,z 4 )、(x 5 ,y 5 ,z 5 ) And the like. The least squares method is a mathematical optimization technique that can find the best functional match of the data by minimizing the sum of the squares of the errors. Correspondingly, the projection data of other coordinate points on the vertical plane can be obtained in a similar manner, which is not described herein again.
Of course, the above description is only exemplary, the way of projecting the coordinate data is not limited to the above examples, and other modifications are possible for those skilled in the art in light of the technical spirit of the present application, and all that can be achieved is covered by the protection scope of the present application as long as the functions and effects achieved by the present application are the same as or similar to those of the present application.
S4: and calculating the bending curvature of each coordinate point on the central line of the straight pipe section based on the projection data of the straight pipe section in different directions.
In this embodiment, after obtaining the projection data of the straight pipe section in different directions, the curvature of each coordinate point on the center line of the straight pipe section may be calculated based on the projection data of the straight pipe section in different directions.
In some embodiments, the calculating the curvature of each coordinate point on the center line of the straight pipe section based on the projection data of the straight pipe section in different directions may include: respectively fitting the projection data of the straight pipe section on the horizontal plane and the projection data of the straight pipe section on the vertical plane to obtain a horizontal plane model and a vertical plane model of the straight pipe section; calculating the curvature of each coordinate point on the central line of the straight pipe section in the horizontal direction and the curvature of each coordinate point on the central line of the straight pipe section in the vertical direction according to the horizontal plane model and the vertical plane model respectively; and obtaining the bending curvature of each coordinate point on the central line of the straight pipe section based on the curvature in the horizontal direction and the curvature in the vertical direction.
In some embodiments, the fitting the projection data of the straight pipe section on the horizontal plane and the projection data of the straight pipe section on the vertical plane to obtain a horizontal plane model and a vertical plane model of the straight pipe section may include: fitting the coordinate data of each continuous preset number of coordinate points in the projection data of the straight pipe section on the horizontal plane by using a least square method to obtain a first fitting curve; wherein the preset number is an odd number; taking a function corresponding to the first fitting curve as a horizontal plane model of a continuous preset number of coordinate points in the straight pipe section; fitting the coordinate data of each continuous preset number of coordinate points in the projection data of the straight pipe section on the vertical surface by using a least square method to obtain a second fitting curve; and taking the function corresponding to the second fitting curve as a vertical plane model of a continuous preset number of coordinate points in the straight pipe section.
For example, in some embodiments, when fitting the projection data of the horizontal plane, a smooth curve may be obtained by fitting each of five consecutive coordinate points (e.g., 1 st to 5 th points, 2 nd to 6 th points, …, and n-4 th to n-th points) by using a least square method, and a cubic function of the curve may be obtained, and then the cubic function of the curve may be used as a horizontal plane model of the five consecutive coordinate points. Similarly, when fitting projection data of a vertical plane, a smooth curve can be obtained by fitting every five consecutive coordinate points (e.g., 1 st to 5 th points, 2 nd to 6 th points, …, n-4 th to n-th points) by using a least square method, and a cubic function of the curve can be obtained, and then the cubic function of the curve can be used as a vertical plane model of the five consecutive coordinate points in the straight pipe section. It should be noted that, in the embodiment of the present disclosure, the projection data may also be fitted by other fitting manners.
In some implementation scenarios, after obtaining the horizontal plane model and the vertical plane model of the straight pipe section, the straight pipe section can be displayed, so that the shape of the pipe can be intuitively understood.
In some embodiments, after obtaining the horizontal plane model and the vertical plane model of the straight pipe section, the curvature in the horizontal direction and the curvature in the vertical direction of each coordinate point on the center line of the straight pipe section may be calculated according to the following manner:
where c denotes curvature, k' denotes a first derivative of the horizontal plane model or the vertical plane model at a coordinate point, and k "denotes a second derivative of the horizontal plane model or the vertical plane model at a coordinate point.
For example, in some embodiments, a first order function and a second order function of the horizontal plane model may be calculated, then the abscissa of each coordinate point in the projection data of the straight tube section on the horizontal plane is substituted into the first order function and the second order function, a first derivative and a second derivative, i.e., k' and k ", under each coordinate point in the horizontal plane are calculated, and finally the curvature of each coordinate point in the horizontal direction is obtained according to formula (1). Similarly, a first order function and a second order function of the vertical plane model can be calculated, then the ordinate of each coordinate point in the projection data of the straight pipe section on the vertical plane is substituted into the first order function and the second order function, a first derivative and a second derivative, namely k 'and k', of each coordinate point on the vertical plane are respectively calculated, and finally the curvature of each coordinate point in the vertical direction is obtained according to the formula (1).
In some implementation scenarios, after obtaining the curvature of each coordinate point in the horizontal direction and the curvature of each coordinate point in the vertical direction, the curvature of each coordinate point on the straight pipe section center line can be obtained by the following formula:
wherein, c General assembly Denotes the curvature of bending, c Level of Represents the curvature in the horizontal direction, c Is vertical Indicating the curvature in the vertical direction.
S6: and determining the strain and stress of each coordinate point on the central line of the straight pipe section in the target pipeline according to the bending curvature.
In the embodiment of the specification, after the bending curvature of each coordinate point on the central line of the straight pipe section is obtained, the strain and the stress of each coordinate point on the central line of the straight pipe section in the target pipeline can be determined according to the bending curvature.
In some embodiments, the strain and stress at each coordinate point on the centerline of the straight pipe section in the target pipeline may be determined by:
σ＝εE (4)
where ε represents the strain at a coordinate point, σ represents the stress at a coordinate point, D represents the nominal diameter of the pipe, c General assembly Denotes the bending curvature, and E denotes the pipe elastic modulus.
In some embodiments, after determining the strain and stress at each coordinate point on the centerline of the straight pipe section in the target pipe, the relationship between the stress and the predetermined stress threshold may be compared, and based on the comparison, it may be determined whether the target pipe meets the safety standard. The preset stress threshold value can be set according to an actual scene. For example, in some implementations, it may be determined that a pipe is unsafe when the strain is 0.5% or greater and that a pipe is safe when the strain is less than 0.5% according to industry standards.
In some implementations, after pipeline strain stress is determined, the evaluation may be saved and uploaded to a local failure database for integrity management of the oil and gas pipeline. The local failure database can be used for storing the data of the internal detection center line and the strain calculation result each time, so that the data can be taken out for comparison.
It is to be understood that the above description is only exemplary, the embodiments of the present disclosure are not limited to the above examples, and other modifications may be made by those skilled in the art within the spirit of the present disclosure, and the function and effect of the present disclosure should be covered by the protection scope of the present disclosure.
The above method is described below with reference to a specific example, however, it should be noted that the specific example is only for better describing the present application and is not to be construed as limiting the present application. FIG. 2 is a schematic flow chart diagram of one embodiment of a method for determining strain and stress in a pipeline as provided herein, as shown in FIG. 2. In this particular embodiment, the following steps may be included.
S201: and acquiring the serial number of the circumferential weld of the pipeline and corresponding central line coordinate data.
Wherein, the joint welding seam of the butt joint of the two pipes is a typical girth welding seam. In this embodiment, one circumferential weld number corresponds to one centerline coordinate. It will be appreciated that in some implementations, there is no limitation to one circumferential weld number for one centerline coordinate, for example, other centerline coordinates may be included between two circumferential welds.
In this embodiment, the obtained number of the girth weld of a certain section of the pipe and the coordinate data of the center line are shown in table 1, wherein the diameter of the pipe is 660mm, the elastic modulus is 200GPa, and X80 is used for the pipe.
TABLE 1 number of circumferential welds of pipes and center line coordinate data
| Circumferential weld numbering | | y | z | |
| 1 | 9.810824 | 7.438952 | 3.84197 | |
| 2 | 21.607064 | 9.464217 | 3.61707 | |
| 3 | 33.091634 | 11.80323 | 3.16642 | |
| 4 | 43.941238 | 15.364016 | 2.75784 | |
| 5 | 55.050229 | 20.002664 | 2.60744 | |
| 6 | 66.27709 | 24.73599 | 2.64851 |
In the embodiment, no elbow is arranged in the coordinate data of the center line of the pipeline, so that the elbow coordinate data does not need to be removed. As shown in fig. 3, fig. 3 is a schematic diagram of three-dimensional coordinate data of a pipeline centerline provided in the present specification, wherein XAxis, YAxis, and ZAxis respectively represent a horizontal coordinate of the pipeline centerline, a vertical coordinate of the pipeline centerline, and an elevation of the pipeline centerline.
S202: and projecting the pipeline central line coordinate data in the horizontal direction and the vertical direction respectively to obtain the projection data of the pipeline central line coordinate data in the horizontal direction and the vertical direction respectively.
S203: based on the projection data in the horizontal direction and the vertical direction, the bending curvature of each coordinate point is calculated.
In this embodiment, fitting may be performed on coordinate points of horizontal projection of the circumferential weld number 1 to 5, and then fitting may be performed on coordinate points of vertical projection of the circumferential weld number 1 to 5, so as to obtain results of fitting of horizontal projection data and vertical projection data of the coordinate points of the circumferential weld number 1 to 5, respectively, as shown in fig. 4 and 5, where fig. 4 is a schematic diagram before and after fitting of the horizontal projection data provided in this specification, fig. 5 is a schematic diagram before and after fitting of the vertical projection data provided in this specification, the original data represents projection data before fitting, and the fitting data represents projection data after fitting.
Further, cubic functions of horizontal and vertical projections of the pipeline, namely a horizontal plane model and a vertical plane model, can be obtained respectively based on the fitted horizontal projection data and vertical projection data. Specifically, the horizontal direction is:
y＝6.07433348380667+0.139830218930074x-0.000305731304001982x 2 +0.0000430276313489952x 3
the vertical direction is as follows:
z＝3.8416121576737-0.000448955201459311l-0.00177241319787392l 2 +0.0000260274908637516l 3
wherein l represents the elevation of the centerline of the pipe relative to the abscissa.
Further, according to the first derivative function and the second derivative function of the two cubic functions, the curvature of the middle point (i.e., the girth weld No. 3) in the horizontal direction is 0.00718, the curvature in the vertical direction is 0.00022, and the bending curvature is 0.00718, which are calculated by formula (1). Correspondingly, the steps can be repeatedly carried out to calculate the bending curvature of other points of the section, and if the No. 2-6 girth welds can be selected to be repeatedly carried out, the bending curvature of the middle point (namely the No. 4 girth welds) of the section can be calculated.
S204: and determining the strain and stress of each coordinate point on the pipeline center line according to the bending curvature.
In this embodiment, the strain of the intermediate point (i.e., the No. 3 girth weld) is 0.237% and the stress is 474MPa according to the formulas (3) and (4). It can be seen that the strain at this point is less than 0.5%, which is a small strain point, and is in an acceptable range, so the stress-strain state at this point is safe.
From the above description, it can be seen that the embodiments of the present application can achieve the following technical effects: the elbow coordinate data are removed from the coordinate data corresponding to the central line of the target pipeline, and the three-dimensional shape of the pipeline is further described by utilizing the coordinate data of the straight pipe section, so that the calculated stress and strain of the pipeline can be more accurate. By projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions and processing the coordinate points by using a fitting method, the coordinate error caused by the accuracy problem of a detection instrument can be effectively reduced, the obtained function can more accurately simulate a three-dimensional model of the pipeline, the stress-strain calculation is more in line with the actual situation, and theoretical support is provided for the excavation and repair of the oil and gas pipeline.
In the present specification, each embodiment of the method is described in a progressive manner, and the same and similar parts in each embodiment may be joined together, and each embodiment focuses on the differences from the other embodiments. Reference is made to the description of the method embodiments.
Based on the method for determining the strain and stress of the pipeline, one or more embodiments of the specification further provide a device for determining the strain and stress of the pipeline. The apparatus may include systems (including distributed systems), software (applications), modules, components, servers, clients, etc. that use the methods described in the embodiments of the present specification in conjunction with any necessary apparatus to implement the hardware. Based on the same innovative conception, embodiments of the present specification provide an apparatus as described in the following embodiments. Since the implementation scheme of the apparatus for solving the problem is similar to that of the method, the specific implementation of the apparatus in the embodiment of the present specification may refer to the implementation of the foregoing method, and repeated details are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Specifically, fig. 6 is a schematic block diagram of an embodiment of an apparatus for determining strain and stress of a pipeline provided in the present specification, and as shown in fig. 6, the apparatus for determining strain and stress of a pipeline provided in the present specification may include: three-dimensional coordinate data acquisition module 120, projection module 122, calculation module 124, and determination module 126.
The three-dimensional coordinate data acquisition module 120 may be configured to acquire three-dimensional coordinate data corresponding to a center line of the straight pipe section; the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line;
the projection module 122 may be configured to project the three-dimensional coordinate data corresponding to the center line of the straight pipe section in different directions, so as to obtain projection data of the straight pipe section in different directions;
the calculation module 124 may be configured to calculate a curvature of each coordinate point on a center line of the straight pipe section based on projection data of the straight pipe section in different directions;
the determining module 126 may be configured to determine the strain and stress at each coordinate point on the centerline of the straight pipe section in the target pipeline according to the bending curvature.
It should be noted that the above-mentioned description of the apparatus according to the method embodiment may also include other embodiments, and specific implementation manners may refer to the description of the related method embodiment, which is not described herein again.
The present specification also provides an embodiment of an apparatus for determining pipe strain and stress, comprising a processor and a memory for storing processor-executable instructions, which when executed by the processor, implement any of the above-described method embodiments. For example, the instructions when executed by the processor implement steps comprising: acquiring three-dimensional coordinate data corresponding to the straight pipe section central line; the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line; projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions to obtain projection data of the straight pipe section in different directions; calculating the bending curvature of each coordinate point on the central line of the straight pipe section based on the projection data of the straight pipe section in different directions; and determining the strain and stress of each coordinate point on the central line of the straight pipe section in the target pipeline according to the bending curvature.
It should be noted that the above-mentioned apparatuses may also include other embodiments according to the description of the method or apparatus embodiments. The specific implementation manner may refer to the description of the related method embodiment, and details are not described herein.
The method embodiments provided in the present specification may be executed in a mobile terminal, a computer terminal, a server or a similar computing device. Taking an example of the server running on the server, fig. 7 is a hardware structure block diagram of an embodiment of a server for determining pipeline strain and stress provided in this specification, where the server may be a device for determining pipeline strain and stress or a system for determining pipeline strain and stress in the foregoing embodiment. As shown in fig. 7, the server 10 may include one or more (only one shown) processors 100 (the processors 100 may include, but are not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA, etc.), a memory 200 for storing data, and a transmission module 300 for communication functions. It will be understood by those skilled in the art that the structure shown in fig. 7 is only an illustration and is not intended to limit the structure of the electronic device. For example, the server 10 may also include more or fewer components than shown in FIG. 7, and may also include other processing hardware, such as a database or multi-level cache, a GPU, or have a different configuration than shown in FIG. 7, for example.
The memory 200 may be used to store software programs and modules of application software, such as program instructions/modules corresponding to the method for determining pipeline strain and stress in the embodiments of the present specification, and the processor 100 executes various functional applications and data processing by executing the software programs and modules stored in the memory 200. Memory 200 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, memory 200 may further include memory located remotely from processor 100, which may be connected to a computer terminal through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission module 300 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the computer terminal. In one example, the transmission module 300 includes a Network adapter (NIC) that can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission module 300 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the hardware + program class embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment. One skilled in the art will recognize that one or more embodiments of the present description may be provided as a method, apparatus or device. Accordingly, one or more embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.
The above description is merely exemplary of one or more embodiments of the present disclosure and is not intended to limit the scope of one or more embodiments of the present disclosure. Various modifications and alterations to one or more embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims.
Claims (8)
1. A method of determining pipe strain and stress, comprising:
acquiring three-dimensional coordinate data corresponding to the straight pipe section central line; the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line;
projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions to obtain projection data of the straight pipe section in different directions;
calculating the bending curvature of each coordinate point on the central line of the straight pipe section based on the projection data of the straight pipe section in different directions;
according to the bending curvature, determining the strain and stress of each coordinate point on the central line of the straight pipe section in the target pipeline;
further comprising:
comparing the relation between the stress and a preset stress threshold value;
determining whether the target pipeline meets a safety standard based on the comparison result;
the projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions to obtain the projection data of the straight pipe section in different directions includes:
projecting the three-dimensional coordinate data corresponding to the central line of the straight pipe section in the horizontal direction to obtain projection data of the straight pipe section on the horizontal plane;
and projecting the three-dimensional coordinate data corresponding to the central line of the straight pipe section in the vertical direction to obtain the projection data of the straight pipe section on the vertical surface.
2. The method according to claim 1, wherein the projecting the three-dimensional coordinate data corresponding to the straight pipe section center line in the vertical direction to obtain the projection data of the straight pipe section in the vertical plane comprises:
fitting the coordinate data of each continuous preset number of coordinate points in the projection data of the straight pipe section on the horizontal plane by using a least square method to obtain a first fitted straight line; wherein the preset number is an odd number;
obtaining fitting coordinate data corresponding to the continuous preset number of coordinate points based on a function corresponding to the first fitting straight line;
calculating the distance between the fitting coordinate data and the fitting coordinate data of the first coordinate point in the continuous preset number of coordinate points;
and obtaining projection data of the straight pipe section on the vertical surface based on the three-dimensional coordinate data, the fitting coordinate data and the distance between the fitting coordinate data of the first coordinate point in the continuous preset number of coordinate points.
3. The method of claim 1, wherein the calculating the curvature of each coordinate point on the centerline of the straight tube section based on the projection data of the straight tube section in different directions comprises:
respectively fitting the projection data of the straight pipe section on the horizontal plane and the projection data of the straight pipe section on the vertical plane to obtain a horizontal plane model and a vertical plane model of the straight pipe section;
calculating the curvature of each coordinate point on the central line of the straight pipe section in the horizontal direction and the curvature of each coordinate point on the central line of the straight pipe section in the vertical direction according to the horizontal plane model and the vertical plane model respectively;
and obtaining the bending curvature of each coordinate point on the central line of the straight pipe section based on the curvature in the horizontal direction and the curvature in the vertical direction.
4. The method according to claim 3, wherein the fitting the projection data of the straight pipe section in the horizontal plane and the projection data of the straight pipe section in the vertical plane respectively to obtain a horizontal plane model and a vertical plane model of the straight pipe section comprises:
fitting the coordinate data of each continuous preset number of coordinate points in the projection data of the straight pipe section on the horizontal plane by using a least square method to obtain a first fitting curve; wherein the preset number is an odd number;
taking a function corresponding to the first fitting curve as a horizontal plane model of a continuous preset number of coordinate points in the straight pipe section;
fitting the coordinate data of each continuous preset number of coordinate points in the projection data of the straight pipe section on the vertical surface by using a least square method to obtain a second fitting curve;
and taking the function corresponding to the second fitting curve as a vertical plane model of a continuous preset number of coordinate points in the straight pipe section.
5. The method of claim 3, wherein the curvature in the horizontal direction and the curvature in the vertical direction of each coordinate point on the straight tube section centerline are calculated according to:
where c denotes curvature, k' denotes a first derivative of the horizontal plane model or the vertical plane model at a coordinate point, and k "denotes a second derivative of the horizontal plane model or the vertical plane model at a coordinate point.
6. The method of claim 1, wherein the strain and stress at each coordinate point on the centerline of the straight pipe section in the target pipeline is determined by:
σ＝εE
where ε represents the strain at a coordinate point, σ represents the stress at a coordinate point, D represents the nominal diameter of the pipe, c General assembly Denotes the bending curvature, and E denotes the pipe elastic modulus.
7. An apparatus for determining pipe strain and stress, comprising:
the three-dimensional coordinate data acquisition module is used for acquiring three-dimensional coordinate data corresponding to the center line of the straight pipe section; the three-dimensional coordinate data corresponding to the straight pipe section central line is obtained by removing elbow coordinate data from the coordinate data corresponding to the target pipeline central line;
the projection module is used for projecting the three-dimensional coordinate data corresponding to the central line of the straight pipe section in different directions to obtain projection data of the straight pipe section in different directions;
the calculation module is used for calculating the bending curvature of each coordinate point on the central line of the straight pipe section based on the projection data of the straight pipe section in different directions;
a determining module, configured to determine, according to the bending curvature, strain and stress at each coordinate point on a center line of the straight pipe section in the target pipeline, wherein the device for determining pipeline strain and stress performs the following method:
comparing the relation between the stress and a preset stress threshold value;
determining whether the target pipeline meets a safety standard based on the comparison result;
the projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in different directions to obtain the projection data of the straight pipe section in different directions includes:
projecting the three-dimensional coordinate data corresponding to the straight pipe section central line in the horizontal direction to obtain projection data of the straight pipe section in the horizontal plane;
and projecting the three-dimensional coordinate data corresponding to the central line of the straight pipe section in the vertical direction to obtain the projection data of the straight pipe section on the vertical surface.
8. An apparatus for determining pipe strain and stress comprising a processor and a memory for storing processor-executable instructions which, when executed by the processor, implement the steps of the method of any one of claims 1 to 6.
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