CN116429584A - Simulation detection method and detection device for submarine oil pipeline contact performance - Google Patents
Simulation detection method and detection device for submarine oil pipeline contact performance Download PDFInfo
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- 230000007547 defect Effects 0.000 abstract description 3
- 238000013459 approach Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing means
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a simulation detection method and a detection device, in particular to a simulation detection method and a detection device for the contact performance of a submarine oil pipeline. The simulation detection device consists of an impact frame, a pneumatic sliding rail and a detection component. The simulation detection device can extrude the outer tube of the tube-in-tube structure in the simulation experiment process, so that the stress condition of the outer tube and the inner tube can be simulated when the outer tube contacts the inner tube, and the simulation experiment can be performed on the tube of the tube-in-tube structure; the impact point, the impact mode, the wall thickness of the outer tube and the material can be changed to carry out simulation analysis on the stress of the tube in the tube under the actual working condition, so that the basis is provided for the research of the oil pipeline of the tube in the tube structure; solves the problems that the oil pipeline research of the pipe-in-pipe structure in the prior art has the defect and the support can not be provided for the pipe-in-pipe overhaul.
Description
Technical Field
The invention relates to a simulation detection method and a detection device, in particular to a simulation detection method and a detection device for the contact performance of a submarine oil pipeline.
Background
Pipes find utility in many areas, such as: "Western gas east transport", oil transportation at the sea floor. The pipeline transportation line is huge in China, and no matter the pipeline transportation line is oil transportation or gas transportation, the pipeline safety problem exists due to the fact that the pipeline is long, and the external environment has unknown threat to the pipeline, so that the pipeline safety is a problem which needs to be considered. The protection structure of the pipeline is the pipe-in-pipe structure, and the pipeline of the pipe-in-pipe structure consists of an outer pipe and an inner pipe; the outer tube mainly plays a role in protecting the inner tube, and in most cases, fillers such as concrete exist between the inner tube and the outer tube, so that a certain compression resistance effect is achieved. When the pipeline with the pipe-in-pipe structure is used in various fields, the outer pipe is extremely easy to collapse and touch the inner pipe under the influence of external hydrostatic pressure, sundries in the environment, local pulling, bottom layer collapse and other factors, so that the inner pipe is damaged, and the problem of leakage of substances in the pipeline is caused. In order to more conveniently and accurately consider the problems of rationality and safety of pipeline laying, and in order to conveniently analyze the situation that the outer pipe deforms to touch the inner pipe in a laboratory, it is necessary to develop a simulation detection method and a detection device so as to detect the stress situations of the outer pipe and the inner pipe when the outer pipe contacts the inner pipe in a simulation pipeline structure, thereby providing a basis for researching the oil pipeline of the pipeline structure in the pipeline.
Disclosure of Invention
The invention aims at: the method and the device for simulating and detecting the contact performance of the submarine oil pipeline can simulate the stress conditions of the outer pipe and the inner pipe when the outer pipe and the inner pipe are contacted, so that experimental basis is provided for the research of the pipeline with the pipe-in-pipe structure.
The technical scheme of the invention is as follows:
the utility model provides a seabed oil pipeline contact performance's simulation detection device, it comprises impact frame, pneumatic slide rail and detection component, its characterized in that: a plurality of pneumatic sliding rails are arranged below the impact frame; the impact frame consists of a support frame, an impact cylinder and a thrust rod, wherein the impact cylinder is hoisted on the support frame, and the thrust rod is fixedly arranged at the end head of a piston rod of the impact cylinder; the detection assembly comprises a plurality of strain gauges.
The support frame is in an inverted U shape.
The pneumatic slide rail constitute by support, slide rail cylinder, slide and staple bolt, install the slide through the slide rail cylinder on the support, be provided with the bracing piece on the slide, the top end of bracing piece is provided with the staple bolt.
A simulation detection method for the contact performance of a submarine oil pipeline is characterized by comprising the following steps: it comprises the following steps:
1) Testing with the middle part of the outer tube as the impacted point
a. The outer tube is sleeved on the inner tube, so that two ends of the inner tube extend out from two end ports of the outer tube;
b. install outer tube and inner tube on the staple bolt of seabed oil pipeline contact performance simulation detection device's pneumatic slide rail, paste three group's foil gage respectively on the outer wall of inner tube, the concrete bonding position of foil gage is: the positions of the strain gauges of the first group are: one end head of the outer tube is hooped on the outer wall of the inner tube corresponding to the hoop; the positions of the second group of strain gauges are: the end hoop at the other end of the outer tube is arranged on the outer wall of the inner tube corresponding to the end hoop at the other end of the outer tube; the positions of the third group of strain gauges are: the middle part of the outer tube is arranged on the outer wall of the inner tube corresponding to the impact point, namely the outer wall of the inner tube below the push stop rod;
c. tightening the anchor ear, and respectively fixing the outer tube and the inner tube on the pneumatic slide rail through the anchor ear, wherein the axes of the outer tube and the inner tube are positioned on the same axis when the outer tube and the inner tube are fixed;
d. setting initial air pressure input into an impact cylinder according to the wall thickness and the material of the outer tube, and driving a thrust rod to extrude the outer tube by the impact cylinder under constant initial air pressure;
when the initial air pressure is too small, the impact cylinder drives the thrust rod to extrude the outer tube, and the outer tube cannot be deformed, the impact cylinder drives the thrust rod to reset, after the impact cylinder resets, the air pressure input into the impact cylinder is increased on the basis of the initial air pressure, and the air pressure after the pressure is increased is input into the impact cylinder again, so that the impact cylinder drives the thrust rod to extrude the outer tube;
the air pressure input into the impact cylinder is increased for a plurality of times through an approach method until the impact cylinder drives the thrust rod to squeeze the outer tube, so that the outer tube is deformed; e. when the impact cylinder drives the thrust rod to extrude the outer tube to gradually deform the inner wall of the outer tube, the inner wall of the outer tube moves towards the outer wall of the inner tube, the inner tube deforms when the inner tube is extruded by the inner wall of the outer tube, the deformation of the inner tube is detected by the strain gauge in the deformation process, the experiment is terminated when the deformation of the inner tube is detected by the strain gauge, the air pressure, the vertical relative displacement, the longitudinal strain and the circumferential strain data of the middle part and the end part of the outer tube are recorded, the change of the middle part and the two ends of the metering pipeline is observed, and the corresponding strain-stress curve is drawn according to calculation;
2) Changing the position of the outer tube, and testing by taking the position of the end head of the outer tube close to the anchor ear as the impacted point
f. B, starting the sliding rail cylinders of the pneumatic sliding rails at the two ends of the outer tube when the step b is repeated, enabling the sliding rail cylinders at the two ends of the outer tube to drive the outer tube to move through the sliding seat, the supporting rod and the anchor ear in sequence, and enabling the position of the thrust rod relative to the outer tube to be changed from the position corresponding to the middle part of the outer tube to the position corresponding to the end head of the outer tube and close to the anchor ear; c, repeating the step b to paste three groups of strain gauges on the outer wall of the inner tube after the outer tube is moved, and repeating the steps c-e in sequence after the strain gauges are pasted, so as to test;
3) Testing by changing distance between hoops at two ends of outer tube
g. B, removing and replacing the damaged inner tube and outer tube, repeating the steps a and b, starting the slide rail cylinders of the pneumatic slide rails at the two ends of the outer tube when repeating the step b, enabling the slide rail cylinders at the two ends of the outer tube to simultaneously drive the anchor clamps to move towards the middle part of the outer tube through the sliding seat and the supporting rod in sequence, reducing the distance between the anchor clamps at the end heads at the two ends of the outer tube, and keeping the position of the thrust rod unchanged corresponding to the middle part of the outer tube; c, after the hoop moves, repeating the step b to paste three groups of strain gauges on the outer wall of the inner tube respectively, and after the strain gauges are pasted, repeating the steps c-e in sequence to test;
h. under the condition of reducing the distances between the hoops at the two ends of the outer tube, changing the positions of the stop push rods corresponding to the outer tube, enabling the ends of the stop push rods corresponding to the outer tube to be close to the positions of the hoops, and repeating the step 2), so as to perform the test;
4) Testing by changing wall thickness of outer tube
i. Increasing the wall thickness of the outer tube, replacing the inner tube and the outer tube, and repeating the steps 1) -3), so as to perform a test;
5) Testing by changing the material of the outer tube
j. Changing the material of the outer tube (for example, replacing the material of the outer tube with plastic by steel), replacing the inner tube and the outer tube, and repeating the steps 1) -4), and performing the test;
6) Testing by changing the impact mode
k. Changing the impact mode, changing the mode of continuously impacting the air pressure input into the impact cylinder from constant pressure to intermittent impact with alternating pressure, and repeating the steps 1) -5) for testing.
In the step e, the pipe-in-pipe structure is simplified to be solid Liang Moxing for calculation, and the concrete process is as follows:
according to the beam flex line equation
Wherein y is deflection; e is the elastic modulus; i is the moment of inertia, is
Where b is the width of the cross section of the beam, h is the length of the cross section of the beam, and b=h=the outer diameter of the inner tube when corresponding to the tube in the tube; f is the force acting on the beam end face; x is the distance from the force F to the strain gage; l is the length of the beam;
at the free end, the deflection is maximum, which is
The static analysis of the beam shows that the stress F and the moment M of the fixed support end act, and M=Fl;
from the relation between strain and moment, it can be obtained
At the strain gauge 1
At the strain gauge 2
Wherein ε 1 And epsilon 2 The strain values, x, measured by the strain gauge at 1 and 2, respectively 1 To the length of the strain gage 1 from the impact force F point, x 2 The length of the strain gauge 2 from the impact force F point is W, the flexural section modulus is
Are available in the simultaneous formulas (3) and (4)
Substituting the formula (5) into the formula (2) to obtain
The above-mentioned relation is that concentrated load is applied to the free end, and the displacement at the maximum deflection point corresponds to the strain at the points 1 and 2; similarly, the relationship between displacement and strain at any point can be deduced by applying a load at any point
A displacement at any point is calculated from the measured strain;
according to finite element theory, the node displacement delta and the strain array epsilon of the unit have the following relation
ε＝Bδ (8)
Wherein B is a geometric matrix;
for a thin plate model, the displacement components u, v can be represented by the deflection w, i.e
Where the deflection w is a function of x, y only. Integrating the above with z to obtain
Since none of the points in the plane of the sheet are displaced parallel to the mid-plane, i.e.
f 1 (x，y)＝f 2 (x, y) =0. The displacement component can be expressed as
Written in matrix form, i.e.
Wherein the method comprises the steps of
For deflection and strain at multiple points, in combination with equation (8), the above equation can be written as a matrix form as follows
ε＝BDw＝Tw (13)
Where t=bd is a transition matrix from displacement to strain;
the displacement is represented by strain by inverse Laplace transform of formula (13), i.e. written in matrix form
w＝Kε (14)
Wherein k=t -1 Is a matrix of conversions (coefficients) from strain to displacement.
The invention has the beneficial effects that:
according to the simulation detection device for the contact performance of the submarine oil pipeline, the outer pipe of the pipe-in-pipe structure can be extruded in the simulation experiment process through the impact cylinder and the thrust rod, so that the stress condition of the outer pipe and the inner pipe can be simulated when the outer pipe of the pipe-in-pipe structure contacts with the inner pipe, and the simulation experiment can be performed on the pipe of the pipe-in-pipe structure; the impact point, the impact mode, the wall thickness of the outer tube and the material can be changed to carry out simulation analysis on the stress of the tube in the tube under the actual working condition, so that the basis is provided for the research of the oil pipeline of the tube in the tube structure; solves the problems that the oil pipeline research of the pipe-in-pipe structure in the prior art has the defect and the support can not be provided for the pipe-in-pipe overhaul.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a right side schematic view of FIG. 1;
FIG. 3 is a schematic representation of a computational model of the present invention.
In the figure: 1. the device comprises a supporting frame, 2, an impact cylinder, 3, a thrust rod, 4, a support, 5, a slide rail cylinder, 6, a slide seat, 7, a hoop, 8, a supporting rod, 9, an outer pipe, 10 and an inner pipe.
Detailed Description
The simulation detection device for the contact performance of the submarine oil pipeline consists of an impact frame, a pneumatic slide rail and a detection assembly, wherein a plurality of pneumatic slide rails are arranged below the impact frame, the pneumatic slide rails are used for supporting an inner pipe and an outer pipe of a pipe-in-pipe structure respectively, fixing the positions of the inner pipe and the outer pipe, ensuring that the positions of the inner pipe and the outer pipe are not easy to change when the inner pipe and the outer pipe are impacted, and simultaneously, respectively adjusting the relative positions of the inner pipe and the outer pipe and adjusting the distance between supporting points of the inner pipe and the outer pipe through the pneumatic slide rails, thereby changing the test conditions for testing; the impact frame has the function of extruding and impacting the outer tube on the pneumatic slide rail, so that the extrusion of the outer tube by the tube-in-tube in the actual working condition is simulated, and the tube-in-tube is tested; the pneumatic slide rail consists of a support 4, a slide rail cylinder 5, a slide seat 6 and a hoop 7, wherein the slide seat 6 is arranged on the support 1 through the slide rail cylinder 5, a support rod 8 is arranged on the slide seat 6, and the hoop 7 is arranged at the top end of the support rod 8 so as to respectively install an outer pipe and an inner pipe for fixing a pipe in a pipe through the hoop 7; the slide rail air cylinder 5 has the function of pushing the slide seat 6 to slide on the support 1 through the slide rail air cylinder 5, and then sequentially driving the support rod 8 and the anchor ear 7 to move in the moving process of the slide seat 6, so as to drive the inner pipe or the outer pipe to move, and change the positions of the inner pipe and the outer pipe; the impact frame is composed of a support frame 1, an impact cylinder 2 and an anti-pushing rod 3, wherein the support frame 1 is in an inverted U shape, the impact cylinder 2 is hoisted on the support frame 1, the anti-pushing rod 3 is fixedly arranged at the end head of a piston rod of the impact cylinder 2, the impact cylinder 2 is used for pushing the anti-pushing rod 3 to move downwards under the action of air pressure of an air source so as to drive the anti-pushing rod 3 to squeeze an outer tube, so that the squeezing of the outer tube of a tube structure in a tube in an actual working condition is simulated, and the critical pressure of the outer tube squeezing the inner tube when the squeezed outer tube is deformed is measured; the detection assembly comprises a plurality of strain gages so as to detect the strain amount of the inner tube through the strain gages, thereby detecting the deformation amount of the outer tube extruded by the inner tube.
The simulation detection method based on the seabed oil pipeline contact performance simulation detection device comprises the following steps: test was performed with the middle of the outer tube 9 as the impacted point
The outer tube 9 is sleeved on the inner tube 10, so that two ends of the inner tube 10 extend out from two end ports of the outer tube 9;
the outer pipe 9 and the inner pipe 10 are arranged on the anchor ear 7 of the pneumatic slide rail of the submarine oil pipeline contact performance simulation detection device, three groups of strain gauges are respectively stuck on the outer wall of the inner pipe 10, and the specific sticking positions of the strain gauges are as follows: the positions of the strain gauges of the first group are: one end of the outer tube 9 is connected with the outer wall of the inner tube 10 corresponding to the end hoop 7; the positions of the second group of strain gauges are: the end hoop 7 at the other end of the outer tube 9 is arranged on the outer wall of the inner tube 10 corresponding to the end hoop; the positions of the third group of strain gauges are: the middle part of the outer tube 9 is on the outer wall of the inner tube 10 corresponding to the impact point, namely on the outer wall of the inner tube 10 below the thrust rod 3; (the strain gage of each group is symmetrically distributed from top to bottom and from left to right)
Tightening anchor clamps, namely respectively fixing the outer tube 9 and the inner tube 10 on a pneumatic slide rail through anchor clamps 7, and enabling the axle centers of the outer tube 9 and the inner tube 10 to be positioned on the same axle when the outer tube 9 and the inner tube 10 are fixed;
according to the wall thickness and the material of the outer tube 9, setting initial air pressure input into the impact cylinder 2, and driving the thrust rod to extrude the outer tube 9 under constant initial air pressure by the impact cylinder;
when the initial air pressure is too small, the impact air cylinder 2 drives the thrust rod 3 to extrude the outer tube 9, and the outer tube 9 cannot be deformed, the impact air cylinder 2 drives the thrust rod 3 to reset, after the impact air cylinder 2 resets, the air pressure input into the impact air cylinder 2 is increased on the basis of the initial air pressure, and the air pressure after the pressure is increased is input into the impact air cylinder 2 again, so that the impact air cylinder 2 drives the thrust rod 3 to extrude the outer tube 9; the air pressure input into the impact cylinder is increased for a plurality of times by an approach method until the impact cylinder 2 drives the thrust rod 3 to squeeze the outer tube 9, so that the outer tube 9 is deformed;
when the impact cylinder 2 drives the stop rod 3 to extrude the outer tube 9 to gradually deform the inner wall of the outer tube 9, the inner wall of the outer tube 9 moves towards the outer wall of the inner tube 10, when the inner wall of the outer tube 9 extrudes the inner tube 10, the inner tube 10 deforms, strain gauges detect the deformation of the inner tube 10 in the deformation process, when the strain gauges detect the deformation of the inner tube 10, the experiment is terminated, the longitudinal strain and circumferential strain data of the air pressure, vertical relative displacement and the middle and end parts of the outer tube 9 are recorded, the change of the middle and the two ends of a metering pipeline is observed, and a corresponding strain-stress curve is drawn according to calculation;
the vertical relative displacement refers to the moment displacement when the central point of the inner pipe attached with the strain gauge is extruded by the outer pipe, the moment displacement is calculated by data and a formula, the strain gauge can obtain engineering strain, and the actual strain is calculated by the formula.
In the calculation process, the pipe-in-pipe structure is simplified to be solid Liang Moxing for calculation, and the specific process is as follows:
according to the beam flex line equation
Wherein y is deflection; e is the elastic modulus; i is the moment of inertia, is
Where b is the width of the cross section of the beam, h is the length of the cross section of the beam, and b=h=the outer diameter of the inner tube when corresponding to the tube in the tube; f is the force acting on the beam end face; x is force F toDistance of strain gage; l is the length of the beam;
at the free end, the deflection is maximum, which is
The static analysis of the beam shows that the stress F and the moment M of the fixed support end act, and M=Fl;
from the relation between strain and moment, it can be obtained
At the strain gauge 1
At the strain gauge 2
Wherein ε 1 And epsilon 2 The strain values, x, measured by the strain gauge at 1 and 2, respectively 1 To the length of the strain gage 1 from the impact force F point, x 2 The length of the strain gauge 2 from the impact force F point is W, the flexural section modulus is
Are available in the simultaneous formulas (3) and (4)
Substituting the formula (5) into the formula (2) to obtain
The above-mentioned relation is that concentrated load is applied to the free end, and the displacement at the maximum deflection point corresponds to the strain at the points 1 and 2; similarly, the relationship between displacement and strain at any point can be deduced by applying a load at any point
A displacement at any point is calculated from the measured strain;
according to finite element theory, the node displacement delta and the strain array epsilon of the unit have the following relation
ε＝Bδ (8)
Wherein B is a geometric matrix;
for a thin plate model, the displacement components u, v can be represented by the deflection w, i.e
Where the deflection w is a function of x, y only. Integrating the above with z to obtain
Since none of the points in the plane of the sheet are displaced parallel to the mid-plane, i.e.
f 1 (x，y)＝f 2 (x, y) =0. The displacement component can be expressed as
Written in matrix form, i.e.
Wherein the method comprises the steps of
For deflection and strain at multiple points, in combination with equation (8), the above equation can be written as a matrix form as follows
ε＝BDw＝Tw (13)
Where t=bd is a transition matrix from displacement to strain;
the displacement is represented by strain by inverse Laplace transform of formula (13), i.e. written in matrix form
w＝Kε (14)
Wherein k=t -1 Is a matrix of conversions (coefficients) from strain to displacement.
Repeating the above process and setting a plurality of experimental groups to perform simulation tests on the pipe in the pipe under different variables according to the following table:
| experimental group | Changing the position of the point of impact | Changing the hoop spacing | Changing the wall thickness of the outer tube | Changing the material of the outer tube | Changing the impact mode |
| 1 | - | 0 | 0 | 0 | 0 |
| 2 | 0 | - | 0 | 0 | 0 |
| 3 | - | - | 0 | 0 | 0 |
| 4 | 0 | 0 | - | 0 | 0 |
| 6 | - | 0 | - | 0 | 0 |
| 6 | 0 | - | - | 0 | 0 |
| 7 | - | - | - | 0 | 0 |
| 8 | 0 | 0 | 0 | - | 0 |
| 9 | - | 0 | 0 | - | 0 |
| 10 | 0 | - | 0 | - | 0 |
| 11 | 0 | 0 | - | - | 0 |
| '2 | - | - | 0 | - | 0 |
| 13 | - | 0 | - | - | 0 |
| 14 | 0 | - | - | - | 0 |
| 15 | - | - | - | - | 0 |
| 16 | 0 | 0 | 0 | 0 | - |
| 17 | - | 0 | 0 | 0 | - |
| 18 | 0 | - | 0 | 0 | - |
| 19 | 0 | 0 | - | 0 | - |
| 20 | 0 | 0 | 0 | - | - |
| 21 | - | - | 0 | 0 | - |
| 22 | - | 0 | - | 0 | - |
| 23 | - | 0 | 0 | - | - |
| 24 | 0 | - | - | 0 | - |
| 25 | 0 | - | 0 | - | - |
| 26 | 0 | 0 | - | - | - |
| 27 | - | - | - | 0 | - |
| 28 | - | 0 | - | - | - |
| 29 | - | - | 0 | - | - |
| 30 | 0 | - | - | - | - |
| 31 | - | - | - | - | - |
In the table above, -indicates a change, 0 indicates no change, such as: the 16 th experimental group is to carry out simulation test by only changing the impact mode without changing the impact point position, the hoop distance, the outer pipe wall thickness and the outer pipe material.
By changing different environment variables, the contact performance of the oil delivery pipe of the pipe-in-pipe structure under various actual working conditions is simulated.
According to the simulation detection device for the contact performance of the submarine oil pipeline, the outer pipe of the pipe-in-pipe structure can be extruded in the simulation experiment process through the impact cylinder 2 and the thrust rod 3, so that the stress condition of the outer pipe and the inner pipe can be simulated when the outer pipe of the pipe-in-pipe structure contacts with the inner pipe, and the simulation experiment can be performed on the pipe of the pipe-in-pipe structure; the impact point, the impact mode, the wall thickness of the outer tube and the material can be changed to carry out simulation analysis on the stress of the tube in the tube under the actual working condition, so that the basis is provided for the research of the oil pipeline of the tube in the tube structure; solves the problems that the oil pipeline research of the pipe-in-pipe structure in the prior art has the defect and the support can not be provided for the pipe-in-pipe overhaul.
Claims (5)
1. The utility model provides a seabed oil pipeline contact performance's simulation detection device, it comprises impact frame, pneumatic slide rail and detection component, its characterized in that: a plurality of pneumatic sliding rails are arranged below the impact frame; the impact frame consists of a support frame (1), an impact cylinder (2) and a thrust rod (3), wherein the impact cylinder (2) is hoisted on the support frame (1), and the thrust rod (3) is fixedly arranged at the end head of a piston rod of the impact cylinder (2); the detection assembly comprises a plurality of strain gauges.
2. The simulated detection device for the contact performance of a submarine oil pipeline according to claim 1, wherein: the support frame (1) is in an inverted U shape.
3. The simulated detection device for the contact performance of a submarine oil pipeline according to claim 1, wherein: the pneumatic slide rail constitute by support (4), slide rail cylinder (5), slide (6) and staple bolt (7), install slide (6) through slide rail cylinder (5) on support (1), be provided with bracing piece (8) on slide (6), the top end of bracing piece (8) is provided with staple bolt (7).
4. The simulation detection method based on the submarine oil pipeline contact performance simulation detection device according to claim 1, wherein the simulation detection method is characterized by comprising the following steps: it comprises the following steps:
1) Testing by taking the middle part of the outer tube (9) as the impacted point
a. The outer tube (9) is sleeved on the inner tube (10), so that two ends of the inner tube (10) extend out from two end ports of the outer tube (9);
b. the outer pipe (9) and the inner pipe (10) are arranged on a hoop (7) of a pneumatic slide rail of a submarine oil pipeline contact performance simulation detection device, and three groups of strain gauges are respectively stuck on the outer wall of the inner pipe (10);
c. the anchor ear is tightened, and the outer tube (9) and the inner tube (10) are respectively fixed on the pneumatic slide rail through the anchor ear (7);
d. according to the wall thickness and the material of the outer tube (9), setting initial air pressure input into the impact cylinder (2), and driving the thrust rod to extrude the outer tube (9) under constant initial air pressure by the impact cylinder to deform the outer tube (9);
e. the impact cylinder (2) drives the stop rod (3) to extrude the outer tube (9) to gradually deform the inner wall of the outer tube (9), when the strain gauge detects that the outer tube (9) extrudes the inner tube to deform the inner tube (10), the experiment is terminated, the air pressure, the vertical relative displacement, the longitudinal strain and the circumferential strain data of the middle part and the end part of the outer tube (9) are recorded, the change of the middle part and the two ends of the metering pipeline is observed, and the corresponding strain-stress curve is drawn according to calculation;
2) Changing the position of the outer tube (9), and testing by taking the position of the end head of the outer tube (9) close to the anchor ear (7) as the impacted point
f. D, removing and replacing the damaged inner tube (10) and the outer tube (9), repeating the steps a and b, and starting a slide rail cylinder (5) of a pneumatic slide rail at two ends of the outer tube (9) when the step b is repeated, so that the position of the thrust rod (3) relative to the outer tube (9) is changed from the position corresponding to the middle part of the outer tube (9) to the position corresponding to the end head of the outer tube (9) close to the anchor ear (7); c, after the outer tube (9) is moved, repeating the step b to paste three groups of strain gauges on the outer wall of the inner tube (10) respectively, and after the strain gauges are pasted, repeating the steps c-e in sequence to test;
3) The distance between the end hoops (7) at the two ends of the outer tube (9) is changed for testing
g. B, starting the slide rail cylinders (5) of the pneumatic slide rails at the two ends of the outer tube (9) when the step b is repeated, enabling the slide rail cylinders (5) at the two ends of the outer tube (9) to drive the anchor ear (7) to move towards the middle part of the outer tube (9) through the sliding seat (6) and the supporting rod (8) simultaneously, reducing the distance between the anchor ears (7) at the two ends of the outer tube (9), and enabling the position of the thrust rod (3) to keep unchanged corresponding to the position of the middle part of the outer tube (9); c, after the hoop (7) moves, repeating the step b to paste three groups of strain gauges on the outer wall of the inner tube (10) respectively, and after the strain gauges are pasted, repeating the steps c-e in sequence to test;
h. under the condition of reducing the intervals between the hoops (7) at the two ends of the outer tube (9), changing the position of the push stopping rod (3) corresponding to the outer tube (9) to enable the end head of the push stopping rod corresponding to the outer tube (9) to be close to the hoops (7), and repeating the step 2) for testing;
4) Testing by changing the wall thickness of the outer tube (9)
i. Increasing the wall thickness of the outer tube (9), replacing the inner tube (10) and the outer tube (9), and repeating the steps 1-3) for testing;
5) Testing by changing the material of the outer tube (9)
j. Changing the material of the outer tube (9), replacing the inner tube (10) and the outer tube (9), repeating the steps 1-4), and testing;
6) Testing by changing the impact mode
k. Changing the impact mode, changing the mode of continuously impacting the air pressure input into the impact cylinder from constant pressure to intermittent impact with alternating pressure, and repeating the steps 1) -5) for testing.
5. The simulation detection method based on the submarine oil pipeline contact performance simulation detection device, according to claim 4, is characterized in that: in the step e, the pipe-in-pipe structure is simplified to be solid Liang Moxing for calculation, and the concrete process is as follows:
according to the beam flex line equation
Wherein y is deflection; e is the elastic modulus; i is the moment of inertia, is
Where b is the width of the cross section of the beam, h is the length of the cross section of the beam, and b=h=the outer diameter of the inner tube when corresponding to the tube in the tube; f is the force acting on the beam end face; x is the distance from the force F to the strain gage; l is the length of the beam;
at the free end, the deflection is maximum, which is
The static analysis of the beam shows that the stress F and the moment M of the fixed support end act, and M=Fl;
from the relation between strain and moment, it can be obtained
At the strain gauge 1
At the strain gauge 2
Wherein ε 1 And epsilon 2 The strain values, x, measured by the strain gauge at 1 and 2, respectively 1 To the length of the strain gage 1 from the impact force F point, x 2 The length of the strain gauge 2 from the impact force F point is W, the flexural section modulus is
Are available in the simultaneous formulas (3) and (4)
Substituting the formula (5) into the formula (2) to obtain
The above-mentioned relation is that concentrated load is applied to the free end, and the displacement at the maximum deflection point corresponds to the strain at the points 1 and 2; similarly, the relationship between displacement and strain at any point can be deduced by applying a load at any point
A displacement at any point is calculated from the measured strain;
according to finite element theory, the node displacement delta and the strain array epsilon of the unit have the following relation
ε＝Bδ (8)
Wherein B is a geometric matrix;
for a thin plate model, the displacement components u, v can be represented by the deflection w, i.e
Wherein, the deflection w is only a function of x and y;
integrating the above with z to obtain
Since none of the points in the plane of the sheet are displaced parallel to the mid-plane, i.e. f 1 (x，y)＝f 2 (x，y)＝0；
The displacement component can be expressed as
Written in matrix form, i.e.
Wherein the method comprises the steps of
For deflection and strain at multiple points, in combination with equation (8), the above equation can be written as a matrix form as follows
ε＝BDw＝Tw (13)
Where t=bd is a transition matrix from displacement to strain;
the displacement is represented by strain by inverse Laplace transform of formula (13), i.e. written in matrix form
w＝Kε (14)
Wherein K=T- 1 Is a matrix of conversions (coefficients) from strain to displacement.
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