CN111721487A - Variable-angle and interval riser group vortex-induced vibration test device based on coupling interference effect - Google Patents
Variable-angle and interval riser group vortex-induced vibration test device based on coupling interference effect Download PDFInfo
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- CN111721487A CN111721487A CN201910211866.XA CN201910211866A CN111721487A CN 111721487 A CN111721487 A CN 111721487A CN 201910211866 A CN201910211866 A CN 201910211866A CN 111721487 A CN111721487 A CN 111721487A
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- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention belongs to the field of ocean engineering, and particularly relates to a variable-angle and variable-interval vertex tension vertical pipe group vortex-induced vibration test device based on a coupling interference effect. The invention aims to carry out angle-variable and interval-variable riser group coupling interference effect test in a wave-flow combined water tank, can provide a feasible top tension applying system and solve the problem of accurately applying and measuring the top tension of a riser group; the adoption of the angle-variable and distance-variable combination device can meet the requirement of a coupling interference effect test of the lower vertical tube group under the synchronous transformation of the angle and the distance. The invention provides a new idea and technical method for the riser group coupling interference effect test.
Description
Technical Field
The invention belongs to the technical field of deep sea engineering, and particularly relates to a variable-angle and variable-interval riser group vortex-induced vibration test device based on a coupling interference effect.
Background
When waves, waves and currents act on the marine riser, flow separation is generated, vortex shedding is generated due to interaction of shear layers separated from the near wake, alternate vortex shedding generates periodically-changed fluid pulsating pressure (lifting force and drag force) on the riser, periodic large-amplitude vibration of the riser is triggered, and the regular vibration in turn changes the distribution form of wake vortex of the riser. Generally, deep sea risers have lower natural vibration frequency, when vortex shedding frequency is close to the natural frequency of the riser, a system is excited to lock vibration within a certain flow velocity range, so that the structural instability of the riser generates violent large-amplitude vibration and accelerates fatigue damage, even collision between risers occurs, the service life of the riser is threatened, and the vortex-induced vibration problem has attracted wide attention of engineering and academic circles.
The marine risers are not only in the form of single joints, but also in the form of structures such as 'strings', 'columns' and 'groups', and are widely used in actual deepwater engineering, and the arrangement forms are various. Under the action of ocean current, a gap flow is generated between the stand pipes, and the wake flow generated by the upstream stand pipe changes the dynamic response of the downstream stand pipe, so that the vibration of the downstream stand pipe is formed by superposition of vortex-induced vibration and tail-induced vibration, and similarly, the downstream stand pipe generates a feedback effect on the upstream stand pipe. Compared with an isolated single pipe, the interference effect among the stand pipes causes the power response, the wake vortex structure and the modal form of the stand pipe group to be quite different, the coupling effect and the response mechanism among the multiple pipes become research hotspots and key points, and the method has important research significance for both academic and engineering circles.
In actual engineering, the upper end of the marine riser is connected with a platform or a ship through a slip joint, the lower end of the marine riser is connected with an oil production wellhead through a universal joint, and various complex marine environmental loads such as waves, ocean currents, ice, earthquakes and the like act on the platform and the riser, so that the riser vibrates in multiple degrees of freedom. In the model test, the connection mode of the riser and the application of the top tension are two important factors that must be considered. Researchers at home and abroad have few researches on the problem of vortex-induced vibration of complex multiple pipes, and a test device for an isolated single pipe cannot meet the requirement of applying group pipe top tension. The invention provides a new thought and technical method for the riser group coupling interference effect test, and has guiding significance for practical engineering.
Disclosure of Invention
The variable-angle and variable-interval vertical pipe group vortex-induced vibration test device based on the coupling interference effect can accurately apply and measure the top tension of the vertical pipe, simultaneously realize the change of the length of the vertical pipe, the change of the arrangement angle and the change of the interval, and ensure that the vertical pipe group vortex-induced vibration test under the coupling interference effect is smoothly developed.
In order to achieve the purpose, the invention adopts the technical scheme that: a variable-angle and variable-interval riser group vortex-induced vibration test device based on a coupling interference effect comprises a top tension applying system, a variable-angle and variable-interval combined device, a fixing device and a riser group model. The top tension applying system consists of a force applying device, a traction steel wire rope, a stainless steel connecting ring, an aluminum alloy force guide plate, an aluminum alloy fixing plate, a force guide rod and an external digital display tensiometer; the angle-variable and distance-variable combination device comprises a dial, a telescopic connecting rod, a magnetic base and a spherical hinge; the fixing device comprises a support, an SBR optical axis linear guide rail, an SBR sliding block, an aluminum alloy fixing plate, a universal joint, a lead screw locking nut, a right-angle corner piece, a T-shaped high-strength bolt and a flange nut; the two ends of the vertical pipe group model are respectively connected with a universal joint which can ensure that the vertical pipe can freely vibrate in the forward direction and the transverse direction.
1. The support of the test device is formed by connecting and fixing the aluminum alloy section by a right-angle corner piece, a T-shaped high-strength bolt and a flange nut, and the four inclined supports are used for ensuring the overall stability.
2. The vertical pipe is connected with the fixing device by adopting a universal joint, so that the vertical pipe is ensured to freely vibrate in the transverse flow direction and the downstream flow direction.
3. The SBR optical axis linear guide rail can ensure that the aluminum alloy guide plate and the aluminum alloy fixing plate slide up and down, the length of the vertical pipe model can be freely changed when the test is carried out, the test working condition is convenient to replace, and the operation flow is simplified.
4. The top tension applying system for the vertical pipe group is the core of the invention, a force applying device applies force to the aluminum alloy force guide plate through the traction steel wire rope and the stainless steel connecting ring, the applied tension is transmitted to the upper aluminum alloy fixing plate through 16 force guide rods, and the four sides of the upper fixing plate are positioned in horizontal positions to ensure that the top tension of each vertical pipe model is the same. An external digital display tensiometer is connected below the aluminum alloy fixing plate to accurately measure the magnitude of the top tension.
5. The angle-variable and distance-variable combination device is the key point for meeting the requirement of an experimental innovation point, 0 degree, 30 degree, 45 degree, 60 degree and 90 degree are marked on the dial plate to meet the angle required by each experimental working condition, grooves with the same sectional area as the telescopic connecting rods are arranged at corresponding positions, one end of each telescopic connecting rod is fixed on the aluminum alloy fixing plate through a spherical hinge, and the other end of each telescopic connecting rod can be fixed in the grooves at the positions of 0 degree, 30 degree, 45 degree, 60 degree and 90 degree of the aluminum alloy fixing plate according to the experimental working conditions. When the test working condition is changed, the telescopic connecting rod is in a contracted state (the tail end 1/2 is contracted in the sleeve at the near end), and when the telescopic connecting rod rotates to the angle required by the test working condition, the tail end of the telescopic connecting rod is pulled to be clamped in the corresponding groove, so that the pipe model can be fixed at the required position in the water environment.
6. The magnetic base and the telescopic connecting rod are adopted to fix the vertical pipe, the magnetic base is placed on the lower side of the telescopic connecting rod, the magnetic base switch is turned on, and the tensiometer and the vertical pipe are firmly fixed with the telescopic connecting rod by virtue of magnetic force; the magnetic base switch is closed, the tensiometer and the vertical pipe are separated from the telescopic connecting rod, the distance between the vertical pipes can be any value, the working condition replacement is convenient, and the test operation process is simplified.
7. The variable-angle and variable-interval riser group vortex-induced vibration testing device based on the coupling interference effect can achieve the aims of accurate application of top tension of the riser group, riser length conversion and synchronous realization of variable angle and interval, and provides technical support for simulating the vortex-induced vibration interference rule of the riser group and obtaining accurate test data. .
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a top tension applying system of the present invention;
FIG. 3 is a schematic view of the combination variable angle and variable spacing apparatus of the present invention;
FIG. 4 is a partial top view of the variable angle and variable spacing joint of the present invention;
in the figure, 1-force application device, 2-traction steel wire rope, 3-stainless steel connecting ring, 4-aluminum alloy guide plate, 5-upper aluminum alloy fixing plate, 6-SBR optical axis linear guide rail, 7-tensiometer display screen, 8-vertical pipe group model, 9-inclined strut, 10-aluminum alloy section bar support, 11-lead screw locking nut, 12-guide rod, 13-right angle piece, 14-external digital display tensiometer, 15-universal joint, 16-telescopic connecting rod, 17-groove, 18-magnetic seat, 19-spherical hinge, 20-lower aluminum alloy fixing plate, 21-dial scale, 22-T type high-strength bolt and flange nut are specifically implemented
The specific implementation mode is as follows:
the aluminum alloy section bar support 10 is fixedly connected through a right-angle corner piece 13, a T-shaped high-strength bolt and a flange nut 22, and four inclined supports 9 are arranged to ensure the overall stability. The bracket base is placed in a water tank, the positions of the upper and lower aluminum alloy fixing plates 5 and 20 are adjusted, the vertical pipe group 8 is connected and fixed up and down by adopting a universal joint 15, the lower aluminum alloy fixing plate 20 is lowered to the bottommost position, the lower aluminum alloy fixing plate 20 is locked by adopting a lead screw locking nut 11, and the upper fixing plate 5 is connected in the same way. According to the invention, a force application device 1 applies force to an aluminum alloy force guide plate 4 through a traction steel wire rope 2 and a stainless steel connecting ring 3, the applied force is transmitted to an upper aluminum alloy fixing plate 5 through a force guide rod 12 and is connected with an external digital display tensiometer 14, and then the force is applied to a vertical pipe group 8, so that four sides of the upper fixing plate 5 are in horizontal positions to ensure that the top tension of each vertical pipe model is the same. The top tension of each vertical pipe is accurately applied by observing the indication number of the tension meter display screen 7 so as to adjust the force applied by the force applying device 1. The aluminum alloy guide plate 4, the upper aluminum alloy fixing plate 5 and the lower aluminum alloy fixing plate 20 can slide up and down along the SBR optical axis linear guide rail 6, the plates are fixed at the designated positions by the lead screw locking nuts 11, the length of a vertical pipe model can be freely changed when a vortex-induced vibration test is carried out, the working condition replacement is facilitated, and the test operation flow is simplified.
In order to solve the test problem of the angle change of the riser group, the dial 21 is arranged on the upper aluminum alloy fixing plate 5 and the lower aluminum alloy fixing plate 20, and is used for calibrating the scales of 0 degree, 30 degree, 45 degree, 60 degree and 90 degree so as to correspond to the angle required by each test working condition, a groove 17 with the same sectional area as that of the telescopic connecting rod 16 is arranged at each position, one end of the telescopic connecting rod 16 is fixed on the lower aluminum alloy fixing plate 20 through a spherical hinge 19, and the other end of the telescopic connecting rod can be fixed in the groove 17 of the angle corresponding to the. When the test working conditions are changed, the telescopic connecting rod 16 is in a contracted state (the tail end 1/2 is contracted in the groove 17 at the near end), and when the telescopic connecting rod is rotated to the positions of 0 degree, 30 degrees, 45 degrees, 60 degrees, 90 degrees and the like required by the test working conditions, the tail end of the telescopic connecting rod 16 is pulled to be clamped in the corresponding groove 17, so that the stand pipe can be firmly arranged in the water environment.
In order to solve the difficult problem of the test of the variable spacing of the riser group, the device adopts a magnetic base 18 and a telescopic connecting rod 16 to fix the riser, the magnetic base 18 is placed at the lower side of the telescopic connecting rod 16, a switch of the magnetic base 18 is turned on, and the external digital display tension meter 14 and the riser group 8 are firmly fixed with the telescopic connecting rod 16 by virtue of magnetic force; the switch of the magnet holder 18 is closed and the tensiometer 14 and the riser 8 are disengaged from the telescopic connecting rod 16. One end of the telescopic connecting rod 16 is marked with scales to ensure that the distance between the stand pipes is accurate enough. The invention provides a test technical method for the research direction of the coupling interference effect of the riser group and lays a foundation for obtaining accurate data.
Claims (12)
1. The utility model provides a riser crowd vortex induced vibration test device of variable angle and interval based on coupling interference effect which characterized in that: the device comprises a top tension applying system, a variable angle and variable spacing combined device, a fixing device and a riser group model.
2. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect of claim 1, wherein: the top tension applying system consists of a force applying device, a traction steel wire rope, a stainless steel connecting ring, an aluminum alloy force guide plate, an aluminum alloy fixing plate, a force guide rod and an external digital display tensiometer.
3. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect of claim 2, wherein: the top tension applying system applies tension to the aluminum alloy force guide plate through the force applying device by the traction steel wire rope and the stainless steel connecting ring, the tension is transmitted to the upper aluminum alloy fixing plate through the 16 force guide rods, and the four sides of the upper fixing plate are positioned in horizontal positions to ensure that the top tension applied to each vertical pipe model is the same.
4. According to the claims 2 and 3, in order to accurately apply and measure the magnitude of the top tension, an external digital display tension meter is connected below the aluminum alloy fixing plate, and the magnitude of the tension is adjusted through the display of a display screen.
5. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect of claim 1, wherein: the angle-variable and distance-variable combination device comprises a dial, a telescopic connecting rod, a magnetic base and a spherical hinge.
6. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect of claim 5, wherein: the upper aluminum alloy fixing plate and the lower aluminum alloy fixing plate are both provided with dials, in order to meet the angle required by the test working condition, scale values of 0 degree, 30 degrees, 45 degrees, 60 degrees and 90 degrees are calibrated on the dials, grooves with the same sectional areas as those of the telescopic connecting rods are arranged at corresponding positions, one end of each telescopic connecting rod is connected with the aluminum alloy fixing plate through a spherical hinge, and the other end of each telescopic connecting rod can be fixed in the grooves at the positions of 0 degree, 30 degrees, 45 degrees, 60 degrees and 90 degrees of the aluminum alloy fixing.
7. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect according to claims 5 and 6, wherein: when the test working conditions are changed, the telescopic connecting rod is in a contracted state (the tail end 1/2 is contracted in the sleeve at the near end), and when the telescopic connecting rod rotates to the positions of 0 degree, 30 degrees, 45 degrees, 60 degrees, 90 degrees and the like required by the test working conditions, the tail end of the telescopic connecting rod is pulled to be clamped in the corresponding groove, so that the pipe group model in the water environment can be fixed at the required position.
8. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect according to claims 5, 6 and 7, wherein: a magnetic base and a telescopic connecting rod are adopted to connect the vertical pipe, the magnetic base is placed on the lower side of the telescopic connecting rod, a magnetic base switch is turned on, and the vertical pipe model and the tensiometer are fixed with the telescopic connecting rod by virtue of magnetic force; the magnetic base switch is closed, the tensiometer and the vertical pipe model are separated from the telescopic connecting rod, one end of the telescopic connecting rod is marked with scales, the distance between the vertical pipes is guaranteed to be accurate enough, the requirement that the distance between the vertical pipes is any value can be met, the working condition replacement is convenient, and the test operation flow is simplified.
9. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect according to claims 5, 6, 7 and 8, wherein: the tensiometer and the telescopic connecting rod are made of steel, so that the working premise of the magnetic base can be guaranteed, and the aim of smoothly developing the test under the water environment can be fulfilled.
10. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect of claim 1, wherein: the fixing device comprises a supporting device, an SBR optical axis linear guide rail, an SBR sliding block, an aluminum alloy fixing plate, a universal joint, a lead screw locking nut, a right-angle corner piece, a T-shaped high-strength bolt and a flange nut.
11. The variable angle and spacing riser group vortex induced vibration testing apparatus based on coupling interference effect of claim 10, wherein: the fixing device connects and fixes the aluminum alloy section through a right-angle corner piece, a T-shaped high-strength bolt and a flange nut, and four inclined supports are arranged to ensure the integral stability; putting the bracket base into a water tank, lowering the lower aluminum alloy fixing plate to the bottommost position, locking the lower aluminum alloy fixing plate by adopting a screw rod locking nut, and connecting and fixing the upper fixing plate in the same way; after the positions of the upper aluminum alloy fixing plate and the lower aluminum alloy fixing plate are adjusted, each vertical pipe of the vertical pipe group is connected with the upper fixing plate and the lower fixing plate through universal joints, and the vertical pipe group is placed between the two universal joints.
12. The variable angle and spacing riser group vortex-induced vibration testing apparatus based on coupling interference effect according to claims 10 and 11, wherein: the aluminum alloy guide plate and the aluminum alloy fixing plate can slide up and down along the SBR optical axis linear guide rail, the plates are fixed at the designated positions by the lead screw locking nuts, and the length of the vertical pipe model can be freely changed during the test.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405770A (en) * | 2021-06-24 | 2021-09-17 | 中国石油大学(华东) | Drilling fluid circulation coupled composite material drill string vibration test device without marine riser |
| CN113465963A (en) * | 2021-06-11 | 2021-10-01 | 中国石油大学(华东) | Test device for testing dynamic response of composite drill column |
| CN115014680A (en) * | 2022-06-17 | 2022-09-06 | 中海石油(中国)有限公司 | Vortex-induced vibration test device for steel catenary riser model |
| CN115824617A (en) * | 2023-02-14 | 2023-03-21 | 中国石油大学(华东) | Deep sea non-riser pipe column system dynamic response test device, method and application |
| CN116202722A (en) * | 2023-04-26 | 2023-06-02 | 山东科技大学 | Marine riser group interference effect test device under combined action of internal and external flows |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115824617A (en) * | 2023-02-14 | 2023-03-21 | 中国石油大学(华东) | Deep sea non-riser pipe column system dynamic response test device, method and application |
| CN115824617B (en) * | 2023-02-14 | 2023-08-08 | 中国石油大学(华东) | Power response test device, method and application of deep sea marine riser-free pipe column system |
| CN116202722A (en) * | 2023-04-26 | 2023-06-02 | 山东科技大学 | Marine riser group interference effect test device under combined action of internal and external flows |
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