Ocean riser vortex-induced vibration response test device induced by platform multi-degree-of-freedom motion

Abstract

This invention also provides an experimental device for testing the vortex-induced vibration response of a marine riser group induced by multi-degree-of-freedom platform motion, relating to the field of vortex-induced vibration. The device includes a multi-degree-of-freedom motion simulation module, a riser spacing adjustment module, a vertical screw adjustment module, a riser base module, and a deep-sea riser assembly module. The vertical screw adjustment module is connected to the riser spacing adjustment module, which is connected to the riser base module. The riser base module is slidably connected to the multi-degree-of-freedom motion simulation module, and the bottom of the riser base module is connected to the deep-sea riser assembly module. In this invention, the multi-degree-of-freedom motion simulation module can simulate the three-dimensional motion of the platform and drive the riser spacing adjustment module to achieve motion in the z-direction. The riser spacing adjustment module can drive the risers to achieve two-dimensional motion in the horizontal direction, and the pipe spacing is self-adjusting, better reflecting engineering practice.

Description

Technical Field

[0001] This invention relates to the field of vortex-induced vibration, and more specifically, to a test device for the response of marine riser groups to vortex-induced vibration induced by multi-degree-of-freedom motion of a platform. Background Technology

[0002] Marine risers are the only channel for the exchange of "signals" and "materials" between seabed resources and surface floating bodies, and are known as the "lifeline" of offshore resource development. Deep-water risers can be up to 3 kilometers long, but only about 30 centimeters in diameter. The viscosity of the fluid causes boundary layer detachment and vortex shedding in the surrounding flow, leading to vortex-induced vibration, which is the main inducing factor for fatigue failure of risers.

[0003] Depending on the form of the excitation flow, vortex-induced vibration response is usually further divided into vortex-induced vibration induced by steady background ocean currents (flow-induced vortex-induced vibration) and secondary vortex-induced vibration induced by the relative flow field formed by the platform motion driving the riser motion (platform motion-induced vortex-induced vibration). In addition, riser systems often exist in a clustered form, with the tail vortex of the upstream riser directly acting on the downstream riser, interacting with the vibration of the downstream riser and inducing more complex wake vortex-induced vibration than a single riser. Due to limitations in experimental technology, the understanding of the two issues—multi-pipe hydrodynamic interference and platform motion-induced secondary vortex-induced vibration of risers—is very limited in both academia and industry. There is an urgent need to design an experimental device that can accurately and effectively control the multiple degrees of freedom of the platform to study the vortex-induced vibration response characteristics and laws of marine riser clusters under the multi-degree-of-freedom motion of the platform. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a test device for vortex-induced vibration response of marine riser groups induced by multi-degree-of-freedom motion of a platform.

[0005] According to the present invention, a test device for vortex-induced vibration response of marine riser group induced by multi-degree-of-freedom motion of platform is provided, comprising a multi-degree-of-freedom motion simulation module, a riser spacing adjustment module, a vertical screw adjustment module, a riser base module, and a deep-sea riser group module. The vertical screw adjustment module is connected to the riser spacing adjustment module, the riser spacing adjustment module is connected to the riser base module, the riser base module is slidably connected to the multi-degree-of-freedom motion simulation module, and the bottom of the riser base module is connected to the deep-sea riser group module.

[0006] The multi-degree-of-freedom motion simulation module includes an x-direction motion module, a y-direction motion module, and a z-direction motion module. The z-direction motion module is slidably connected to the x-direction motion module, and the y-direction motion module is slidably connected to the y-direction motion module.

[0007] Preferably, the x-direction motion module includes a platform x-direction servo motor, a servo motor connector, a platform x-direction transmission belt, and a platform x-direction motion track. The platform x-direction transmission belt is sleeved on the servo motor connector, and the servo motor connector is connected to the platform x-direction servo motor. The platform x-direction transmission belt and the platform x-direction motion track are arranged in parallel. The platform x-direction servo motor drives the platform x-direction transmission belt to move through the servo motor connector, thereby driving the y-direction motion module to slide on the platform x-direction motion track.

[0008] Preferably, the y-direction motion module includes a platform support frame, a platform y-direction transmission belt, a platform y-direction servo motor, a platform y-direction motion track, a platform y-direction motion slider, and a transmission belt connecting plate. The platform y-direction transmission belt and the platform y-direction motion track are arranged in parallel on the platform support frame. The platform y-direction motion slider is slidably connected to the platform y-direction transmission belt and the platform y-direction motion track, respectively. The platform y-direction motion slider is provided with a transmission belt connecting plate, which is connected to the z-direction motion module. The platform y-direction servo motor drives the platform y-direction transmission belt to move in the y-direction, and the platform y-direction transmission belt drives the platform y-direction motion slider to slide and connect to the platform y-direction motion track, thereby driving the z-direction motion module to move in the y-direction.

[0009] Preferably, the z-direction motion module includes a platform z-direction servo motor, a platform z-direction motion track, and a platform z-direction motion slider. The platform z-direction motion slider is slidably connected to the platform z-direction motion track via the platform z-direction servo motor. The platform z-direction motion slider drives the riser base module to slide on the platform z-direction motion track, and the riser base module drives the deep-sea riser assembly module to move z-up.

[0010] Preferably, the end of the platform's z-axis motion slider is equipped with a connecting end, which is connected to the back mounting plate of the riser base module.

[0011] Preferably, the riser spacing adjustment module includes a riser x-axis motion track, a riser timing belt slider, a riser y-axis motion track, a riser y-axis motion slider, and an L-shaped plate. The riser x-axis motion track is connected to the support frame of the riser base module. The riser timing belt slider is slidably connected to the riser x-axis motion track. The riser y-axis motion track is connected to the riser timing belt slider. The riser y-axis motion slider is slidably connected to the riser y-axis motion track. The riser y-axis motion slider is connected to the riser y-axis motion slider. The L-shaped plate is connected to the vertical screw adjustment module.

[0012] Preferably, the vertical lead screw adjustment module includes a lead screw support frame, a bottom connecting plate, a lead screw, a spring tensioning assembly, a fixing bolt, and a tensioner fixing plate. The vertical lead screw adjustment module is connected to the deep-sea riser assembly module through the bottom connecting plate. One end of the lead screw passes through the lead screw support frame, which is connected to an L-shaped plate. The other end of the lead screw is fitted with a spring tensioning assembly, and the top of the spring tensioning assembly is connected to the tensioner fixing plate through a fixing bolt.

[0013] Manually adjust the height of the top of the riser in the deep-sea riser module, tighten the fixing bolts, and the spring tensioning component is compressed. The elastic restoring force of the spring tensioning component is balanced with the weight of the riser. The riser is fixed and its height is adjusted by fixing bolts, tensioner fixing plate and spring tensioning component.

[0014] Preferably, the deep-sea riser module includes a riser, a three-part force sensor, a fiber optic sensor, and heat shrink tubing. The module is connected to the bottom connecting plate, the three-part force sensor is connected to the end of the riser, the fiber optic sensor is evenly distributed on the riser, and the heat shrink tubing is wrapped around the outer wall of the riser and around the outside of the fiber optic sensor.

[0015] In the experiment, the deep-sea riser module measured the forces acting on it in the xyz directions using a three-part force sensor. The riser's strain at various typical cross-sections was measured using a fiber optic sensor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In this invention, the multi-degree-of-freedom motion simulation module can simulate the three-dimensional motion of the platform and drive the riser spacing adjustment module to achieve motion in the z-direction; the riser spacing adjustment module can drive the riser to achieve two-dimensional motion in the horizontal direction, and on this basis, the pipe spacing can be self-adjusted, promoting related research on the interference effect of multi-pipe spacing. The riser can perform three-dimensional motion relative to the platform, which means that the number of experimental working condition combinations increases and is more in line with engineering practice. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the experimental device provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the multi-degree-of-freedom motion module provided by the present invention;

[0021] Figure 3 This is a schematic diagram of the riser spacing adjustment module provided by the present invention;

[0022] Figure 4 This is a schematic diagram of the vertical lead screw adjustment module provided by the present invention;

[0023] Figure 5 This is a schematic diagram of the riser base module provided by the present invention;

[0024] Figure 6 This is a structural schematic diagram of the deep-sea riser module provided by the present invention.

[0025] Numbering on the map:

[0026] 1. Multi-degree-of-freedom motion simulation module; 2. Riser spacing adjustment module; 3. Vertical lead screw adjustment module; 4. Riser base module; 5. Deep-sea riser assembly module; 6. Platform support frame; 7. Platform Y-axis transmission belt; 8. Platform Y-axis servo motor; 9. Platform Y-axis motion track; 10. Platform Y-axis motion slider; 11. Transmission belt connecting plate; 12. Platform X-axis servo motor; 13. Servo motor connector; 14. Platform Z-axis servo motor; 15. Platform Z-axis motion track; 16. Platform Z-axis motion slider; 17. 18. Platform x-axis drive belt; 19. Platform x-axis motion track; 20. Riser x-axis motion track; 21. Riser synchronous belt slider; 22. Riser y-axis motion track; 23. Riser y-axis motion slider; 24. L-shaped plate; 25. Screw support frame; 26. Bottom connecting plate; 27. Screw; 28. Compression spring tensioning assembly; 29. ​​Fixing bolt; 30. Tensioner fixing plate; 31. Back fixing plate; 32. Support frame; 33. Riser; 34. Three-part force sensor; 35. Fiber optic strain sensor; 36. Heat shrink tubing. Detailed Implementation

[0027] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0028] Example

[0029] According to the present invention, an experimental device for vortex-induced vibration response of a marine riser group induced by multi-degree-of-freedom motion of a platform includes a multi-degree-of-freedom motion simulation module 1, a riser spacing adjustment module 2, a vertical screw adjustment module 3, a riser base module 4, and a deep-sea riser assembly module 5. The vertical screw adjustment module 3 is connected to the riser spacing adjustment module 2, the riser spacing adjustment module 2 is connected to the riser base module 4, the riser base module 4 is slidably connected to the multi-degree-of-freedom motion simulation module 1, and the bottom of the riser base module 4 is connected to the deep-sea riser assembly module 5. The multi-degree-of-freedom motion simulation module 1 includes an x-direction motion module, a y-direction motion module, and a z-direction motion module. The z-direction motion module is slidably connected to the x-direction motion module, and the y-direction motion module is slidably connected to the y-direction motion module.

[0030] The x-direction motion module includes a platform x-direction servo motor 13, a servo motor connector 14, a platform x-direction transmission belt 18, and a platform x-direction motion track 19. The platform x-direction transmission belt 18 is sleeved on the servo motor connector 14, and the servo motor connector 14 is connected to the platform x-direction servo motor 13. The platform x-direction transmission belt 18 and the platform x-direction motion track 19 are arranged in parallel. The platform x-direction servo motor 13 drives the platform x-direction transmission belt 18 to move through the servo motor connector 14, thereby driving the y-direction motion module to slide on the platform x-direction motion track 19.

[0031] The y-direction motion module includes a platform support frame 7, a platform y-direction transmission belt 8, a platform y-direction servo motor 9, a platform y-direction motion track 10, a platform y-direction motion slider 11, and a transmission belt connecting plate 12. The platform y-direction transmission belt 8 and the platform y-direction motion track 10 are arranged in parallel on the platform support frame 7. The platform y-direction motion slider 11 is slidably connected to the platform y-direction transmission belt 8 and the platform y-direction motion track 10, respectively. The platform y-direction motion slider 11 is provided with a transmission belt connecting plate 12, which is connected to the z-direction motion module. The platform y-direction servo motor 9 drives the platform y-direction transmission belt 8 to move in the y-direction. The platform y-direction transmission belt 8 drives the platform y-direction motion slider 11 to slide and connect to the platform y-direction motion track 10, thereby driving the z-direction motion module to move in the y-direction.

[0032] The z-axis motion module includes a platform z-axis servo motor 15, a platform z-axis motion track 16, and a platform z-axis motion slider 17. The platform z-axis motion slider 17 is slidably connected to the platform z-axis motion track 16 via the platform z-axis servo motor 15. The platform z-axis motion slider 17 drives the riser base module 4 to slide on the platform z-axis motion track 16, and the riser base module 4 drives the deep-sea riser assembly module 6 to move z-up. A connecting end is installed at the end of the platform z-axis motion slider 17, and the connecting end is connected to the back mounting plate 31 of the riser base module 4.

[0033] The riser spacing adjustment module 2 includes a riser x-axis motion track 20, a riser timing belt slider 21, a riser y-axis motion track 22, a riser y-axis motion slider 23, and an L-shaped plate 24. The riser x-axis motion track 20 is connected to the support frame 32 of the riser base module 4. The riser timing belt slider 21 is slidably connected to the riser x-axis motion track 20. The riser y-axis motion track 22 is connected to the riser timing belt slider 21. The riser y-axis motion slider 23 is slidably connected to the riser y-axis motion track 22. The riser y-axis motion slider 23 is connected to the riser y-axis motion slider 23. The L-shaped plate 24 is connected to the riser y-axis motion slider 23. The L-shaped plate 24 is connected to the vertical screw adjustment module 3.

[0034] The vertical lead screw adjustment module 3 includes a lead screw support frame 25, a bottom connecting plate 26, a lead screw 27, a spring tensioning assembly 28, a fixing bolt 29, and a tensioner fixing plate 30. The vertical lead screw adjustment module 3 is connected to the deep-sea riser assembly module 5 through the bottom connecting plate 26. One end of the lead screw 27 passes through the lead screw support frame 25, which is connected to the L-shaped plate 24. The other end of the lead screw 27 is fitted with the spring tensioning assembly 28, and the top of the spring tensioning assembly 28 is connected to the tensioner fixing plate 30 through the fixing bolt 29. The height of the riser 32 in the deep-sea riser assembly module 6 is manually adjusted by tightening the fixing bolt 29. The spring tensioning assembly 28 is compressed, and its elastic restoring force balances the weight of the riser 32. The riser 32 is fixed and its height is adjusted via the fixing bolt 29, the tensioner fixing plate 30, and the spring tensioning assembly 28.

[0035] The deep-sea riser module 5 includes a riser 32, an optical fiber sensor 34, and a heat shrink tubing 35. The optical fiber sensor 34 is evenly distributed on the riser 32, and the heat shrink tubing 35 is wrapped around the outer wall of the riser 32 and around the outside of the optical fiber sensor 34. In the experiment, the riser 32 measures the strain of each typical section through the optical fiber sensor 34.

[0036] More specifically, based on experiments with ocean currents, this invention achieves precise simulation of the platform's three degrees of freedom motion, better reflecting engineering realities. This invention can handle a large number of operating conditions, including combinations of arbitrary degrees of freedom and different motion trajectories, closely mirroring reality and better simulating the vortex-induced vibration response of working risers in actual operation. Compared to traditional single-pipe test devices, this invention adds a riser array arrangement system, enabling the study of the hydrodynamic characteristics of pipe arrays. This invention allows for flexible adjustment of the spacing between multiple pipes, ensuring the feasibility and accuracy of experiments studying the influence of riser array spacing. Compared to other similar devices, this invention is simpler, easier to disassemble, and facilitates easy conversion of operating conditions.

[0037] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A test device for vortex-induced vibration response of a marine riser group induced by multi-degree-of-freedom motion of a platform, characterized in that, The system includes a multi-degree-of-freedom motion simulation module (1), a riser spacing adjustment module (2), a vertical screw adjustment module (3), a riser base module (4), and a deep-sea riser assembly module (5). The vertical screw adjustment module (3) is connected to the riser spacing adjustment module (2), the riser spacing adjustment module (2) is connected to the riser base module (4), the riser base module (4) is slidably connected to the multi-degree-of-freedom motion simulation module (1), and the bottom of the riser base module (4) is connected to the deep-sea riser assembly module (5). The multi-degree-of-freedom motion simulation module (1) includes an x-direction motion module, a y-direction motion module and a z-direction motion module. The z-direction motion module is slidably connected to the x-direction motion module, and the y-direction motion module is slidably connected to the y-direction motion module. The x-direction motion module includes a platform x-direction servo motor (12), a servo motor connector (13), a platform x-direction transmission belt (17), and a platform x-direction motion track (18). The platform x-direction transmission belt (17) is sleeved on the servo motor connector (13), and the servo motor connector (13) is connected to the platform x-direction servo motor (12). The platform x-direction transmission belt (17) and the platform x-direction motion track (18) are arranged in parallel. The platform x-direction servo motor (12) drives the platform x-direction transmission belt (17) to move through the servo motor connector (13), thereby driving the y-direction motion module to slide on the platform x-direction motion track (18). The riser spacing adjustment module (2) includes a riser x-axis motion track (18), a riser synchronous belt slider (20), a riser y-axis motion track (21), a riser y-axis motion slider (22), and an L-shaped plate (23). The riser x-axis motion track (18) is connected to the support frame (31) of the riser base module (4). The riser synchronous belt slider (20) is slidably connected to the riser x-axis motion track (18). The riser y-axis motion track (21) is connected to the riser synchronous belt slider (20). The riser y-axis motion slider (22) is slidably connected to the riser y-axis motion track (21). The riser y-axis motion slider (22) is connected to the riser y-axis motion slider (22). The L-shaped plate (23) is connected to the riser y-axis motion slider (22). The L-shaped plate (23) is connected to the vertical screw adjustment module (3).

2. The test device for vortex-induced vibration response of marine riser groups induced by multi-degree-of-freedom motion of a platform as described in claim 1, characterized in that, The y-direction motion module includes a platform support frame (6), a platform y-direction transmission belt (7), a platform y-direction servo motor (8), a platform y-direction motion track (9), a platform y-direction motion slider (10), and a transmission belt connecting plate (11). The platform y-direction transmission belt (7) and the platform y-direction motion track (9) are arranged in parallel on the platform support frame (6). The platform y-direction motion slider (10) is slidably connected to the platform y-direction transmission belt (7) and the platform y-direction motion track (9), respectively. The platform y-direction motion slider (10) is provided with a transmission belt connecting plate (11). The transmission belt connecting plate (11) is connected to the z-direction motion module. The platform y-direction servo motor (8) drives the platform y-direction transmission belt (7) to move in the y-direction. The platform y-direction transmission belt (7) drives the platform y-direction motion slider (10) to slide on the platform y-direction motion track (9), thereby driving the z-direction motion module to move in the y-direction.

3. The test device for vortex-induced vibration response of marine riser groups induced by multi-degree-of-freedom motion of a platform as described in claim 2, characterized in that, The z-direction motion module includes a platform z-direction servo motor (14), a platform z-direction motion track (15), and a platform z-direction motion slider (16). The platform z-direction motion slider (16) is slidably connected to the platform z-direction motion track (15) via the platform z-direction servo motor (14). The platform z-direction motion slider (16) drives the riser base module (4) to slide on the platform z-direction motion track (15). The riser base module (4) drives the deep-sea riser assembly module (5) to move z-direction upward.

4. The test device for vortex-induced vibration response of marine riser groups induced by multi-degree-of-freedom motion of a platform as described in claim 3, characterized in that, The platform z-axis motion slider (16) has a connecting end installed at its end, which is connected to the back mounting plate (30) of the riser base module (4).

5. The test device for vortex-induced vibration response of marine riser groups induced by multi-degree-of-freedom motion of a platform according to claim 1, characterized in that, The vertical lead screw adjustment module (3) includes a lead screw support frame (24), a bottom connecting plate (25), a lead screw (26), a spring tensioning assembly (27), a fixing bolt (28), and a tensioner fixing plate (29). The vertical lead screw adjustment module (3) is connected to the deep-sea riser assembly module (5) through the bottom connecting plate (25). One end of the lead screw (26) passes through the lead screw support frame (24), and the lead screw support frame (24) is connected to the L-shaped plate (23). The other end of the lead screw (26) is fitted with the spring tensioning assembly (27), and the top of the spring tensioning assembly (27) is connected to the tensioner fixing plate (29) through the fixing bolt (28). Manually adjust the height of the top of the riser (32) in the deep-sea riser assembly module (5), tighten the fixing bolt (28), the spring tensioning assembly (27) is compressed, the elastic restoring force of the spring tensioning assembly (27) is balanced with the gravity of the riser (32), the riser (32) is fixed and its height is adjusted by the fixing bolt (28), the tensioner fixing plate (29) and the spring tensioning assembly (27).

6. The test device for vortex-induced vibration response of marine riser groups induced by multi-degree-of-freedom motion of a platform according to claim 1, characterized in that, The deep-sea riser module (6) includes a riser (32), a three-part force sensor (33), an optical fiber sensor (34), and a heat shrink tube (35). The optical fiber sensor (34) is evenly distributed on the riser (32), and the heat shrink tube (35) is wrapped around the outer wall of the riser (32) and around the outside of the optical fiber sensor (34). In the experiment, the deep-sea riser module (6) measured the force in the xyz direction through the three-part force sensor (33); the riser (32) measured the strain of each typical section through the fiber optic sensor (34).

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