CN113137912B - Pipeline deformation analysis method based on magnetic structure coupling - Google Patents
Pipeline deformation analysis method based on magnetic structure coupling Download PDFInfo
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- CN113137912B CN113137912B CN202110608854.8A CN202110608854A CN113137912B CN 113137912 B CN113137912 B CN 113137912B CN 202110608854 A CN202110608854 A CN 202110608854A CN 113137912 B CN113137912 B CN 113137912B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/24—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in magnetic properties
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Abstract
The invention discloses a magnetic structure coupled pipeline deformation analysis method, which comprises the following steps of obtaining a Lorentz force distribution curve, an axial size change curve and a temperature change curve of a target line cake of an electromagnetic coil, wherein the electromagnetic coil is determined based on the pipeline thickness of a target pipeline; acquiring a first relation among a Lorentz force distribution curve, an axial size change curve and a temperature change curve; under the condition of applying different external forces to the target pipeline, at least obtaining a stress change curve, a pipeline temperature distribution curve and a coercive force distribution curve of the target pipeline; acquiring a second relation among a coercive force distribution curve, a stress change curve and a pipeline temperature distribution curve; establishing a pipeline deformation analysis model according to the first relation and the second relation, wherein the pipeline deformation analysis model is used for analyzing the deformation condition of the pipeline according to the temperature change condition; the technical scheme provided by the invention fills up the technical blank in the field and realizes the pipeline deformation testing technology based on temperature and thickness change.
Description
Technical Field
The invention relates to the field of pipeline thickness measurement, in particular to a pipeline deformation analysis method based on magnetic structure coupling.
Background
The station is a central hub for long-distance oil and gas resource transmission, plays a vital role in continuous and efficient transmission of oil and gas pipelines, and has great strategic significance on energy safety in China. The technological operation of the oil and gas station is continuous and complex, the oil and gas medium to be conveyed is inflammable and explosive, and the system for auxiliary production is huge and fussy, so the requirement for safety inspection of the oil and gas station is increasingly improved.
The safety detection of oil and gas stations includes the thickness detection of oil pipelines, and in the prior technical scheme, for thickness detection, external force or signal energy is applied to the pipeline to be detected more or less directly or indirectly, the thickness of the pipeline is obtained through analysis of received signals, the method is greatly influenced by the geographical position and the natural condition, is time-consuming and labor-consuming, sometimes has certain dangerousness, and the result of measurement is inaccurate due to the problems of signal receiving and interference, for the hidden danger of the safe burying of the oil pipeline, a method is urgently needed, three factors of coercive force, temperature and stress are combined, the relationship between the temperature change and the coercive force and stress change is analyzed, and then directly can measure the pipeline thickness change condition through measuring the pipeline temperature change, provide new technical thinking for the thickness detection of pipeline.
Disclosure of Invention
The invention aims to obtain a direct relation model of temperature and pipeline thickness by obtaining a relation model of coercive force and temperature, combining the relation model of coercive force and stress and the relation model of stress and temperature and according to the corresponding relation of stress and pipeline thickness, thereby realizing that the thickness change condition of a pipeline is directly reflected by measuring the temperature change of the pipeline.
The invention provides a magnetic structure coupled pipeline deformation analysis method, which comprises the following steps:
acquiring a Lorentz force distribution curve, an axial size change curve and a temperature change curve of a target line cake of an electromagnetic coil, wherein the electromagnetic coil is determined based on the pipe thickness of a target pipe;
acquiring a first relation among a Lorentz force distribution curve, an axial size change curve and a temperature change curve;
under the condition of applying different external forces to the target pipeline, at least obtaining a stress change curve, a pipeline temperature distribution curve and a coercive force distribution curve of the target pipeline;
acquiring a second relation among a coercive force distribution curve, a stress change curve and a pipeline temperature distribution curve;
and establishing a pipeline deformation analysis model according to the first relation and the second relation, and analyzing the deformation condition of the pipeline according to the temperature change condition.
Preferably, the Lorentz force distribution curve of the target wire cake is obtained by changing the axial size of the wire cake of the target wire cake of the electromagnetic coil and applying voltage to the electromagnetic coil.
Preferably, at least two target line cakes are selected, wherein at least ten line cakes are included between each target line cake.
Preferably, the application of the voltage is stopped, and the axial dimension change curve and the temperature change curve are obtained in the case where the electromagnetic coil is applied with the lorentz force based on the lorentz force distribution curve.
Preferably, the target line cake is set to the pipe thickness when the Lorentz force is applied to the electromagnetic coil.
Preferably, under the condition that a first external force is applied to the target pipeline, the first stress change curve, the first pipeline temperature distribution curve and the first coercive force distribution curve are extracted, and an initial first relation is obtained.
Preferably, under the condition that a second external force is applied to the target pipeline, a second stress change curve, a second pipeline temperature distribution curve and a second coercive force distribution curve are extracted to obtain an initial second relation.
Preferably, when a third external force is applied to the target pipeline, the second relationship is obtained through the initial first relationship and the initial second relationship, where the third external force includes a first external force and a second external force, the second external force is applied after the first external force is applied for a period of time, the first duration of the first external force is determined according to the initial first relationship, and the second duration of the second external force is determined according to the initial second relationship.
The invention discloses the following technical effects:
the method can directly reflect the thickness change condition of the pipeline and the coercive force and stress distribution condition of the pipeline by directly measuring the temperature change condition of the point of the pipeline, provides technical reference for the online real-time monitoring of the pipeline, and fills the technical blank based on temperature monitoring in the field of pipeline thickness monitoring.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 illustrates an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a magnetic structure coupled pipeline deformation analysis method, which comprises the following steps:
acquiring a Lorentz force distribution curve, an axial size change curve and a temperature change curve of a target line cake of the electromagnetic coil, wherein the electromagnetic coil is determined based on the pipe thickness of a target pipe; changing the axial size of a wire cake of a target wire cake of the electromagnetic coil and applying voltage to the electromagnetic coil to obtain a Lorentz force distribution curve of the target wire cake; stopping applying voltage, and obtaining an axial dimension change curve and a temperature change curve under the condition of applying Lorentz force based on a Lorentz force distribution curve to the electromagnetic coil; when Lorentz force is applied to an electromagnetic coil, setting target line cakes as the thickness of the pipeline, and when the target line cakes are selected, selecting at least two target line cakes, wherein at least ten line cakes are included between each target line cake; acquiring a first relation among a Lorentz force distribution curve, an axial size change curve and a temperature change curve;
under the condition that a first external force is applied to the target pipeline, extracting a first stress change curve, a first pipeline temperature distribution curve and a first coercive force distribution curve to obtain an initial first relation.
And under the condition that a second external force is applied to the target pipeline, extracting a second stress change curve, a second pipeline temperature distribution curve and a second coercive force distribution curve to obtain an initial second relation.
And under the condition that a third external force is applied to the target pipeline, acquiring a second relation through the initial first relation and the initial second relation, wherein the third external force comprises a first external force and a second external force, the second external force is applied after the first external force is applied for a period of time, the first duration time of the first external force is determined according to the initial first relation, and the second duration time of the second external force is determined according to the initial second relation.
And establishing a pipeline deformation analysis model according to the first relation and the second relation, and analyzing the deformation condition of the pipeline according to the temperature change condition.
Example 1: as shown in FIG. 1, the invention discloses a pipe deformation analysis method based on a magnetic structure coupling field, which comprises the following steps:
winding an electromagnetic coil based on the thickness of the target pipeline and according to the thickness of the pipeline, wherein the electromagnetic coil comprises a plurality of wire cakes, and the axial size of each wire cake is not larger than the thickness of the pipeline; selecting a target line cake of which the axial size is smaller than the thickness of the pipeline based on the axial size of a line cake of an electromagnetic coil, carrying out transformer simulation based on the electromagnetic coil, constructing a magnetic structure coupling model based on a transformer, electrifying the transformer, and obtaining a Lorentz force distribution curve of the target line cake based on the magnetic structure coupling model by changing the axial size of the line cake of the target line cake; setting the axial dimension of a line cake of a target line cake as the thickness of a pipeline, applying corresponding Lorentz force to an electromagnetic coil based on a Lorentz force distribution curve, obtaining a dimension change curve of the axial dimension of the line cake and a temperature change curve of the target line cake, and constructing a first deformation evaluation model of the deformation of the target line cake corresponding to the temperature change of the target line cake; applying different external forces to the target pipeline to obtain a coercive force distribution curve and a pipeline thickness variation curve of the target pipeline under the action of different external forces, and a second temperature distribution curve inside the target pipeline and a third temperature distribution curve outside the target pipeline; constructing a first stress distribution model based on the coercive force distribution change based on the coercive force distribution curve and the stress distribution curve; constructing a second stress distribution model based on temperature change according to the stress change curve of the target pipeline based on the second temperature distribution curve and the third temperature distribution curve; constructing a first pipeline thickness change evaluation model based on stress based on a stress change curve and the pipeline thickness change curve; under the condition that external force is applied to the target pipeline, a first stress change curve, a first pipeline temperature distribution curve and a first coercive force distribution curve are obtained, and an initial first relation is obtained according to the first stress change curve, the first pipeline temperature distribution curve and the first coercive force distribution curve. And under the condition that plastic stress is applied to the target pipeline, acquiring a second stress change curve, a second pipeline temperature distribution curve and a second coercive force distribution curve, and acquiring an initial second relation according to the second stress change curve, the second pipeline temperature distribution curve and the second coercive force distribution curve. And under the condition of applying cyclic stress to the target pipeline, acquiring a first pipeline thickness change evaluation model through the initial first relation and the initial second relation.
Constructing a coercive force distribution model based on temperature change based on the first stress distribution model and the second stress distribution model; constructing a second pipeline thickness change evaluation model based on the coercive force distribution change based on the first stress distribution model and the first pipeline thickness change evaluation model; and constructing a pipeline thickness change evaluation model based on temperature change based on the second pipeline change evaluation model, the coercive force distribution model and the first deformation evaluation model, and obtaining the pipeline thickness change condition of the target pipeline by monitoring the temperature change condition of the target pipeline.
The first diameter of the electromagnetic coil is the same as the second diameter of the target conduit.
The length of the electromagnetic coil is the same as that of the target pipeline; the target line cakes comprise at most three, wherein at least ten line cakes are contained between each target line cake.
The material of the target conduit is a ferromagnetic material.
And establishing a magnetic structure coupling model based on the J-A hysteresis mathematical model, and improving the magnetic structure coupling model by fitting a hysteresis loop and the J-A hysteresis mathematical model according to a simulated annealing algorithm so as to reduce the error of the magnetic structure coupling model.
The first stress distribution model is used for determining the stress condition of the target pipeline according to the distribution condition of the coercive force of the target pipeline.
And performing additional measurement on the target pipeline through the electromagnetic ultrasonic transducer to obtain ultrasonic flight time and ultrasonic amplitude, and constructing a second stress distribution model according to the stress change curve by combining the additional measurement with the second temperature distribution curve and the third temperature distribution curve.
The electromagnetic ultrasonic transducer at least comprises three pairs, wherein the included angle between each pair of electromagnetic ultrasonic ring energy devices is 90 degrees.
The constraint conditions of the first deformation evaluation model are as follows: the structural member material of the electromagnetic coil is approximately considered to be uniform, linear and isotropic, the higher harmonics are not considered, the influence of current displacement is ignored, and the influence of the self structure on a leakage magnetic field is ignored.
The method mainly aims to obtain a relation model of coercive force and temperature change by analyzing the relation of the change of the Lorentz force and the temperature, obtain a relation model of temperature and thickness change by analyzing the relation model of coercive force and stress and the relation model of temperature and stress, insert an iron core into an electromagnetic coil when the relation model of coercive force and temperature change is constructed, if the magnetic hysteresis loop of the iron core is inevitably required to be considered by purely carrying out the sexual simulation through a J-A magnetic hysteresis mathematical model, if the parameter is ignored, the accuracy of the result of the subsequent simulation is influenced, and the error of the model can be greatly reduced by introducing a simulated annealing algorithm to fit the magnetic hysteresis loop of the iron core and the J-A magnetic hysteresis mathematical model, so that the accuracy of an evaluation model constructed based on the J-A magnetic hysteresis mathematical model is enhanced, when the electromagnetic coil is wound, attention should be paid to that when a target coil cake is selected, the coil cakes close to two ends of the electromagnetic coil cannot be selected, the middle position of the electromagnetic coil is selected as much as possible, the interval between the two target coil cakes cannot be too small, at least more than ten coil cakes need to be spaced, the electromagnetic coil is a continuous coil, the axial size of the coil cake cannot exceed the thickness of a target pipeline, the axial size needs to be strictly controlled, the pitch phase inclination cannot exceed 3 millimeters, and the pitch phase inclination needs to be controlled within plus or minus 1.5 millimeters as much as possible. When a model of the coercive force and the stress relation of a target pipeline is established, different stresses are applied to the target pipeline, and a magnetic-stress relation model is established by detecting the distribution condition of the coercive force, namely the condition of a hysteresis curve, and is used for directly showing the distribution condition of the stresses by measuring the coercive force.
Ultrasonic detection is carried out on the pipeline through the ultrasonic transducer as an auxiliary detection means, when the diameter of the pipeline is large, the ultrasonic transducer at least comprises three pairs, preferably four pairs, the included angle between each pair is 90 degrees, if the diameter of the pipeline is small, the ultrasonic transducer only needs one pair, the included angle is 90 degrees, and the number of pairs of the ultrasonic transducer needs to be reasonably set according to the function condition of the ultrasonic transducer and the diameter of a combined coil. The temperature-stress relation model of the pipeline is established by measuring the temperature change curve of the detection point and further reacting the stress change through the temperature change, and finally the relation model reflecting the thickness change of the pipeline through the temperature is established by combining all the models, so that the technical assumption of predicting the thickness trend of the pipeline through the real-time change of the temperature and the technical fact of measuring the thickness of the pipeline through the change of the temperature are realized.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A deformation analysis method for a magnetic structure coupled pipeline is characterized by comprising the following steps:
acquiring a Lorentz force distribution curve, an axial size change curve and a temperature change curve of a target line cake of an electromagnetic coil, wherein the electromagnetic coil is determined based on the pipe thickness of a target pipe;
acquiring a first relation among the Lorentz force distribution curve, the axial size change curve and the temperature change curve;
under the condition that different external forces are applied to the target pipeline, at least obtaining a stress change curve, a pipeline temperature distribution curve and a coercive force distribution curve of the target pipeline;
acquiring a second relation among the coercive force distribution curve, the stress change curve and the pipeline temperature distribution curve;
and establishing a pipeline deformation analysis model according to the first relation and the second relation, and analyzing the deformation condition of the pipeline according to the temperature change condition.
2. A method of deformation analysis of a magnetically coupled pipe according to claim 1,
and changing the axial size of the wire cake of the target wire cake of the electromagnetic coil and applying voltage to the electromagnetic coil to obtain a Lorentz force distribution curve of the target wire cake.
3. A method of deformation analysis of a magnetically coupled pipe according to claim 2,
and selecting at least two target line cakes, wherein at least ten line cakes are included between each target line cake.
4. A method of deformation analysis of a magnetically coupled pipe according to claim 2,
stopping applying the voltage, and obtaining the axial dimension variation curve and the temperature variation curve when the electromagnetic coil is applied with the Lorentz force based on the Lorentz force distribution curve.
5. A method of deformation analysis of a magnetically coupled pipe according to claim 4,
setting the target wire cake to the pipe thickness while the Lorentz force is applied to the electromagnetic coil.
6. A method of deformation analysis of a magnetically coupled pipe according to claim 1,
under the condition that a first external force is applied to the target pipeline, a first stress change curve, a first pipeline temperature distribution curve and a first coercivity distribution curve are obtained, and an initial first relation is obtained according to the first stress change curve, the first pipeline temperature distribution curve and the first coercivity distribution curve.
7. A method of deformation analysis of a magnetically coupled pipe according to claim 6,
and under the condition that a second external force is applied to the target pipeline, acquiring a second stress change curve, a second pipeline temperature distribution curve and a second coercive force distribution curve, and acquiring an initial second relation according to the second stress change curve, the second pipeline temperature distribution curve and the second coercive force distribution curve.
8. A method of deformation analysis of a magnetically coupled pipe according to claim 7,
and under the condition that a third external force is applied to the target pipeline, acquiring the second relation through the initial first relation and the initial second relation, wherein the third external force comprises the first external force and the second external force, the second external force is applied after the first external force is applied for a period of time, the first duration time of the first external force is determined according to the initial first relation, and the second duration time of the second external force is determined according to the initial second relation.
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