π-type jumper vortex-induced vibration seated experiment device considering submarine influence

Abstract

The application provides a seated type experimental device for vortex-induced vibration of a pi type jumper pipe considering the influence of the seabed, comprising a deep-sea pi type jumper pipe model, a rigid boundary constraint connection module, a multi-directional flow meeting seabed simulation module, a gear transmission module, a bearing support module, a rotary positioning module, a positioning support module, a stability maintaining fixing module, an upper computer control module and a measurement module; the device provided by the application simulates the disturbance of a smooth seabed to the flow field of the pi type jumper pipe and considers the influence of the seabed.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering test devices, in particular to a π-type jumper pipe vortex-induced vibration bottom-mounted test device taking seabed influence into account. Background Art

[0002] Jumper pipes, as the medium connecting submarine oil and gas wellheads, are essential key equipment in the field of marine engineering. Marine pipelines in the marine engineering field are cylindrical structures. Under the influence of ocean currents, vortices will alternately discharge on both sides of this cylindrical structure, generating periodic pulsating forces. The cyclically changing alternating stress triggers vibrations in the column of the jumper's suspended span, and the column vibrations in turn affect the wake structure of the ocean current, forming a nonlinear, self-regulated or self-governed multi-degree-of-freedom phenomenon. When the vortex shedding frequency is close to or the same as the natural frequency of the jumper, resonance occurs, causing a significant increase in the amplitude of the structure—vortex-induced vibration. Vortex-induced vibration is a major factor leading to fatigue damage in marine jumpers.

[0003] Most of the current research in China focuses on theoretical analysis and CFD (Computational Fluid Dynamics) simulation. However, since the vortex-induced vibration of the jumper pipe is a high-Reynolds number turbulence problem, the computer simulation is extremely computationally intensive and very unstable, its accuracy needs to be verified, and its practicality is poor, so it still needs to be developed based on experiments. Previous experimental research mainly focused on the simulation of vortex-induced vibration of straight pipes or suspended pipes in a single direction under uniform / shear flow. There have been few experimental studies on π-type underwater jumper pipes with multi-directional vortex discharge and mixed torsional response, and no experimental studies have been conducted on headflows in different directions. The experimental environment is mostly set up in a towing tank, and the experimental time is limited. At the same time, the influence of the seabed is rarely taken into account, and there is a lack of simulation of the flow field disturbance caused by the seabed on the model. In the Chinese patent document with publication number CN109296356A, a real-time monitoring and automatic alarm device for vortex-induced vibration of seabed steel jumper pipes is disclosed. The research object involves vortex-induced vibration of jumper pipes, and only focuses on the real-time monitoring and automatic alarm of vortex-induced vibration of seabed steel jumper pipes. There is no simulation function of multi-directional headflow of vortex-induced vibration of jumper pipes and uniform flow near the seabed. Summary of the Invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a π-type jumper pipe vortex-induced vibration bottom-mounted experimental device that takes into account the influence of the seabed.

[0005] According to the present invention, a π-type jumper pipe vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed is provided, comprising: a deep-sea π-type jumper pipe model, a rigid boundary constraint connection module, a multi-directional upstream flow seabed simulation module, a gear transmission module, a bearing support module, a rotation positioning module, a positioning support module, a stabilization and fixing module, a host computer control module, and a measurement module;

[0006] The two ends of the deep-sea π-type jumper tube model are connected to the rigid boundary constraint module, the rigid boundary constraint module is fixedly set on the multi-directional upstream flow seabed simulation module, and the multi-directional upstream flow seabed simulation module is slidably set on the bottom of the circulating water tank; the multi-directional upstream flow seabed simulation module is meshed and connected with the rotation positioning module through a gear transmission module, the rotation positioning module is rotatably connected to the positioning support module, the positioning support module is fixedly set on the stabilization and fixing module, the gear transmission module, the multi-directional upstream flow seabed simulation module and the rotation positioning module are rotatably set in the bearing support module; the upper computer control module sets the test conditions, and the measurement module completes the dynamic strain and force response measurement of the deep-sea π-type jumper tube model.

[0007] Preferably, the deep-sea π-type jumper model includes a central pipe, a pipe joint, a heat shrink tube and a fiber Bragg grating strain string; two pairs of the fiber Bragg grating strain strings are pre-embedded in the plane of the π-type jumper and on the surface of each section of the central pipe perpendicular to the plane, and the heat shrink tube wraps the central pipe and the fiber Bragg grating strain string.

[0008] Preferably, the rigid constraint connection module includes a neck flange, a three-force sensor, a connecting pile, and a connecting clamp; the end of the deep-sea π-type jumper pipe model is fixedly connected to the neck of the neck flange; the flange plate of the neck flange is fixedly connected to the three-force sensor; the three-force sensor is fixed to the vertical panel of the connecting pile; and the connecting pile is fixedly set on the multi-directional headwind seabed simulation module.

[0009] Preferably, the rotation positioning module comprises: a rotation positioning plate, a first rotation shaft, a first spur gear, a first ball, an elbow, a positioning rod, a positioning joint, and a first deep groove ball bearing;

[0010] The first spur gear and the first rotating shaft are connected by a key to achieve circumferential positioning; the first spur gear and the shoulder of the first rotating shaft are in contact with the first ball through a groove to achieve axial positioning; the first rotating shaft and the inner ring of the first deep groove ball bearing at the top of the first rotating shaft are connected by an interference fit; the first deep groove ball bearing at the top of the first rotating shaft is positioned on the rotating positioning plate through a groove; the first rotating shaft and the positioning rod are fixedly connected through the elbow; the first rotating shaft and the positioning rod shaft system rotate to achieve angle conversion function; the positioning rod is connected to the rotating positioning plate with bolts through the positioning joint to achieve positioning after rotation.

[0011] Preferably, the positioning support module includes: a connecting joint, a main support column, and a side support column;

[0012] The two ends of the main support column are fixedly connected to the connecting joints respectively; the other end of the connecting joint at the upper end of the support column is fixed to the rotation positioning module, and the other end of the connecting joint at the lower end is fixed to the stabilization and fixing module; the side support column is fixed on the main support column.

[0013] Preferably, the stabilization and fixing module includes: a positioning platform plate and a weight; the positioning platform plate determines its position according to the position of the support column of the positioning support module, and after the connection joint with the positioning support module is fixed, the weight is placed on it.

[0014] Preferably, the gear transmission module includes: a second spur gear, a second rotating shaft, and a second ball; the second spur gear and the second rotating shaft are keyed to achieve circumferential positioning; the shoulders of the second spur gear and the second rotating shaft contact the second ball through their respective grooves to achieve axial positioning; the first spur gear in the rotation positioning module is engaged with the first second spur gear in the gear transmission module, and the multiple second spur gears in the gear transmission module are engaged with each other to achieve the transmission of angle transformation in the rotation positioning module.

[0015] Preferably, the multi-directional flow-upcoming seabed simulation module includes: a baffle, a support leg, a roller, a third rotating shaft, a circular connecting joint, a square connecting joint, a third spur gear, a third ball, and a roller; the support leg is fixedly connected to the baffle through the square connecting joint; the support leg is rotatably connected to the roller; the middle part of the baffle is fixedly connected to the third rotating shaft through the circular connecting joint; the third spur gear and the third rotating shaft are circumferentially positioned through a key connection; the shoulders of the third spur gear and the third rotating shaft contact the third ball through their respective grooves to achieve axial positioning; the last second spur gear in the gear transmission module is meshed with the third spur gear in the multi-directional flow-upcoming seabed simulation module.

[0016] Preferably, the bearing support module includes a second deep groove ball bearing and a bearing support plate; the inner ring of the second deep groove ball bearing is connected to the first, second and third rotating shafts in the rotation positioning module, the multi-directional upstream flow seabed simulation module and the gear transmission module through interference fit; the outer ring of the second deep groove ball bearing is placed on the bearing support plate through a groove positioning.

[0017] Preferably, the measurement module includes a fiber Bragg grating demodulator, an IO unit, a storage unit, a wireless unit and a receiving unit; the fiber Bragg grating demodulator demodulates the vibration strain signal from the fiber Bragg grating strain gauge distributed and pre-buried in the deep-sea π-type jumper model, the IO unit converts the analog signal of the three-force sensor of the rigid boundary constraint fixed module into a digital signal, which is synchronously stored by the storage unit, and the wireless unit sends the stored data to the receiving unit to complete the dynamic strain and force response measurement.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The experimental device of the present invention has a simple structure and low complexity;

[0020] 2. The present invention conducts experiments in a circulating water tank, and the experimental duration can be set by itself without being affected by the length of the tank;

[0021] 3. The device of the present invention is firm and the experimental operation is safe. The working condition conversion can be completed outside the circulating water tank. The problem of the traditional experimental technology of waiting for water to drain for a long time will not occur.

[0022] 4. The natural frequency of the device of the present invention is significantly different from the significant period of vortex-induced vibration, and no resonance phenomenon occurs;

[0023] 5. The device provided by the present invention can simulate the flow angle within 0° to 90°, and realize the flow field simulation of multi-angle uniform flow;

[0024] 6. The device provided by the present invention simulates the disturbance of the smooth seabed to the flow field of the π-type jumper pipe, taking into account the influence of the seabed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 It is a three-dimensional schematic diagram of the water tank in the present invention;

[0027] Figure 2 It is a perspective view of the three-dimensional assembly of the present invention;

[0028] Figure 3 This is a schematic diagram of the deep-sea π-type jumper model of the present invention;

[0029] Figure 4 It is a three-dimensional schematic diagram of the rigid constraint connection module in the present invention;

[0030] Figure 5 It is a three-dimensional schematic diagram of the rotation positioning module of the present invention;

[0031] Figure 6 It is a three-dimensional schematic diagram of the positioning support module in the present invention;

[0032] Figure 7 It is a three-dimensional schematic diagram of the stabilization and fixing module of the present invention;

[0033] Figure 8 It is a three-dimensional schematic diagram of the gear transmission module in the present invention;

[0034] Figure 9 It is a three-dimensional schematic diagram of the multi-directional upstream seabed simulation module of the present invention;

[0035] Figure 10 This is a three-dimensional schematic diagram of the bearing support module of the present invention;

[0036] Figure 11 It is a three-dimensional schematic diagram of the host computer control module in the present invention;

[0037] Figure 12 It is a three-dimensional schematic diagram of the measurement module in the present invention.

[0038] Description of reference numerals:

[0039] Deep sea π-type jumper model 1 Main support column 41

[0040] Rigid boundary constraint connection module 2 connection joint 42

[0041] Rotation positioning module 3 side support column 43

[0042] Positioning support module 4 Positioning platform plate 51

[0043] Stabilizing and fixing module 5, weight 52

[0044] Gear transmission module 6 second spur gear 61

[0045] Multi-directional upstream seabed simulation module 7 Second rotation axis 62

[0046] Bearing support module 8 Second ball 63

[0047] Host computer control module 9 baffle 71

[0048] Measuring module 10 Support leg 72

[0049] Center pipe 11 roller 73

[0050] Pipe joint 12 Third rotation shaft 74

[0051] Heat shrink tube 13 Circular connection joint 75

[0052] Fiber grating strain string 14 Third straight gear 76

[0053] Necked flange 21 Third ball 77

[0054] Three-component force sensor 22 Square connection joint 78

[0055] Connection pile 23 Second deep groove ball bearing 81

[0056] Connection clamp 24 Bearing support plate 82

[0057] Rotary positioning plate 31 Industrial computer 91

[0058] First rotation shaft 32 Intelligent flow control system 92

[0059] Positioning rod 33 Flow generating system 93

[0060] Positioning joint 34 Fiber demodulator 1001

[0061] Elbow 35 IO input unit 1002

[0062] First straight gear 36 Storage unit 1003

[0063] First ball 37 Wireless unit 1004

[0064] First deep groove ball bearing 38 Receiving unit 1005 DETAILED DESCRIPTION

[0065] The application will be described in further detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the application. These are within the scope of the present application.

[0066] The present embodiment will be further described below with reference to the accompanying drawings.

[0067] As Figure 1As shown, this embodiment includes a deep-sea Π-type jumper model 1, a rigid boundary constraint connection module 2, a rotation positioning module 3, a positioning support module 4, a stabilization and fixing module 5, a gear transmission module 6, a multi-directional upstream seabed simulation module 7, a bearing support module 8, a host computer control module 9, and a measurement module 10. Among them, the two ends of the deep-sea π-type jumper model 1 are connected to the rigid boundary constraint module 2 through flanges, the rigid boundary constraint connection module 2 is fixed to the multi-directional upstream flow seabed simulation module 7 by bolts, the multi-directional upstream flow seabed simulation module 7 slides freely on the bottom of the circulating water tank through rollers, the multi-directional upstream flow seabed simulation module 7 is meshed with the rotation positioning module 3 through the gear transmission module 6, the rotation positioning module 3 is connected to the positioning support module 4 by bolts, the positioning support module 4 is fixed to the stabilization and fixing module 5 by bolts, the first, second and third rotating shafts in the modules 3, 6 and 7 are connected to the bearing support module 8 through the second deep groove ball bearing and groove positioning, the bearing support module 8 is placed on the bottom of the circulating water tank, the upper computer control module 9 generates flow according to the set flow rate, and realizes the disturbance simulation of the flow field of the π-type jumper by the smooth seabed and the uniform flow field simulation of the π-type jumper subjected to multi-angle upstream flow through the angle transformation of the rotation positioning module 3 and the rotation angle transmission of the gear transmission module 6 and the flow blocking effect of the multi-directional upstream flow seabed simulation module 7.

[0068] like Figure 2 As shown, the deep-sea π-type jumper model 1 includes a central tube 11, a tube joint 12, a heat shrink tubing 13, and a fiber Bragg grating (FBG) strain gauge 14. Two pairs of FBG strain gauges 14 are pre-embedded on the surface of each central tube section within the plane of the jumper and perpendicular to the plane. The heat shrink tubing 13 wraps around the central tube 11 and the FBG strain gauges 14.

[0069] like Figure 3 As shown, the rigid boundary constraint connection module 2 includes a neck flange 21, a three-force sensor 22, a connecting pile 23, and a connecting fixture 24. The end of the deep-sea π-type jumper model is bolted to the neck of the neck flange 21; the flange plate of the neck flange 21 is bolted to the three-force sensor 22; the three-force sensor 22 is bolted to the vertical panel of the connecting pile 23; and the connecting pile 23 is bolted to the multi-directional upstream seabed simulation module 7 via the connecting fixture 24. The rigid connections between the various module components restrict the six degrees of freedom of motion at both ends of the π-type jumper model, achieving rigid constraint boundary conditions at both ends. Rigid connections between modules ensure the rigid fixation of the modules.

[0070] like Figure 4As shown, the rotation positioning module 3 includes: a rotation positioning plate 31, a first rotation shaft 32, a positioning rod 33, a positioning joint 34, an elbow 35, a first spur gear 36, a first ball 37, and a first deep groove ball bearing 38. The first spur gear 36 and the first rotation shaft 32 are keyed to achieve circumferential positioning; the shoulders of the first spur gear 36 and the first rotation shaft 32 contact the first ball 37 through their respective grooves to achieve axial positioning; the first rotation shaft 32 and the inner ring of the first deep groove ball bearing 38 are connected by an interference fit; the first deep groove ball bearing 38 is positioned on the rotation positioning plate 31 through a groove; the first rotation shaft 32 and the positioning rod 33 are screwed together through the elbow 35; the first rotation shaft 32 and the positioning rod 33 rotate in a shaft system to achieve angle conversion function; the positioning rod 33 is bolted to the rotation positioning plate 31 through the positioning joint 34 to achieve positioning after rotation.

[0071] like Figure 5 As shown, the positioning support module 4 comprises a main support column 41, a connecting joint 42, and a side support column 43. The main support column 41 is secured to the connecting joint 42 at both ends via screws. The other end of the connecting joint 42 at the upper end of the main support column 41 is bolted to the rotation positioning module 3, while the other end of the connecting joint 42 at the lower end is bolted to the stabilization and fixation module 5. The side support columns 43 are secured to the main support column 41 via welding. This module utilizes the rigidity and dimensions of the support column structure to restrict the vertical movement of the rotation positioning plate, achieving vertical fixation.

[0072] like Figure 6 As shown, the stabilization and fixing module 5 includes a positioning platform plate 51 and a weight 52. The positioning platform plate 51 is positioned according to the position of the support column of the positioning support module 4. After being fixed to the connection joint 42 of the positioning support module 4 by bolts, the weight 52 is placed on it to achieve the function of maintaining the stability of the device and fixing the position.

[0073] like Figure 7 As shown, the gear transmission module 6 includes: a second spur gear 61, a second rotating shaft 62, and a third second ball bearing 63. The second spur gear 61 and the second rotating shaft 62 are keyed to achieve circumferential positioning; the shoulders of the second spur gear 61 and the second rotating shaft 62 contact the third ball bearing 63 through their respective grooves to achieve axial positioning; the first spur gear 36 in the rotation positioning module 3 meshes with the first second spur gear 61 in the gear transmission module 6, and the multiple second spur gears 61 in the gear transmission module 6 mesh with each other, thereby achieving the transmission of angle transformation in the rotation positioning module.

[0074] like Figure 8As shown, the multi-directional upstream seabed simulation module 7 includes: a baffle 71, a support leg 72, a roller 73, a third rotating shaft 74, a circular connecting joint 75, a third spur gear 76, a third ball 77, and a square connecting joint 78. The support leg 72 is fixed to the baffle 71 with bolts through a square connecting joint 78; the support leg 72 is connected to the roller 73 by bolts; the roller 73 is in direct contact with the bottom of the circulating water tank and can slide freely; the middle part of the baffle 71 is bolted to the third rotating shaft 74 through the circular connecting joint 75; the third spur gear 76 and the third rotating shaft 74 are keyed to achieve circumferential positioning; the third spur gear 76 and the shaft shoulder of the third rotating shaft 74 are in contact with the third ball 77 through their respective grooves to achieve axial positioning; the last second spur gear 61 in the gear transmission module 6 and the third spur gear 76 in the multi-directional upstream flow seabed simulation module 7 are engaged to achieve the angular driven transformation of the multi-directional upstream flow seabed simulation module; the baffle 71 can avoid the influence of the gear disk 61 in the gear transmission module 6 on the wake field of the π-type jumper pipe, thereby realizing the disturbance simulation of the flow field of the π-type jumper pipe model caused by the smooth seabed.

[0075] like Figure 9 As shown, the bearing support module 8 includes a second deep groove ball bearing 81 and a bearing support plate 82. The inner ring of the second deep groove ball bearing 81 is connected to the first, second, and third rotating shafts of the rotation positioning module 3, the multi-directional upstream seabed simulation module 7, and the gear transmission module 6 through an interference fit; the outer ring of the second deep groove ball bearing 81 is positioned on the bearing support plate 82 via a groove, and the bearing support plate 82 is placed on the inner bottom of the circulating water tank to prevent friction between the rotating shaft and the inner bottom of the circulating water tank.

[0076] like Figure 10 As shown, the host control module 9 includes an industrial control computer 91, an intelligent flow control system 92, and a flow generation system 93. The operator inputs a constant flow rate into the industrial control computer 91, and the operating computer 91 issues motion instructions to the intelligent flow control system 92, which in turn controls the flow generation system 93 to form the desired uniform flow field.

[0077] like Figure 11 As shown, the measurement module 10 includes a fiber Bragg grating demodulator 1001, an I / O unit 1002, a storage unit 1003, a wireless unit 1004, and a receiving unit 1005. The fiber Bragg grating demodulator 1001 demodulates the vibration strain signal from the fiber Bragg grating strain gauge distributed and pre-buried in the deep-sea π-type jumper model 1. The I / O unit 1002 converts the analog signal of the three-force sensor 22 of the rigid boundary constraint connection module 2 into a digital signal. Both are synchronously stored by the storage unit. The wireless unit 1004 sends the stored data to the receiving unit 1005 to complete the dynamic strain and force response measurement.

[0078] The production and installation process of this embodiment is as follows:

[0079] Before the formal experiment, the appropriate similarity criteria, model scale ratio, and experimental conditions were selected based on the actual dimensions of the deep-sea π-type jumper model, the specific test conditions, the size of the laboratory circulating water tank, and the economic feasibility of the experiment. The appropriate materials and dimensions for each module were selected based on the strength and rigidity requirements of the experimental device under the experimental conditions. After the modules of the experimental device were fabricated, the detailed installation steps were as follows:

[0080] First, the support legs in the multi-directional upstream flow submarine simulation module are connected to the baffle with bolts through a square connecting joint; on the other side, the bottom of the third rotating shaft is connected to the first deep groove ball bearing through an interference fit, and the third spur gear is inserted from the top of the third rotating shaft. The circumferential and axial positioning of the gear is achieved through the key, the shaft shoulder and the third ball, and then the third rotating shaft is fixed to the baffle with bolts through a circular connecting joint to complete the assembly of the multi-directional upstream flow submarine simulation module.

[0081] Secondly, outside the circulating water tank, buckle the connecting joint and the upper and lower ends of the main support column together, place the lower end on the positioning platform outside the circulating water tank, adjust the position, and complete the preliminary assembly of the positioning support module.

[0082] Next, in the drained circulating water tank, connect the bottom of the first rotating shaft in the rotary positioning module with the second deep groove ball bearing through an interference fit. Insert the first straight gear from the top of the first rotating shaft, and achieve circumferential and axial positioning of the gear through the key, shaft shoulder, and first ball bearing. Then insert the rotary positioning plate from the top of the first rotating shaft, and then insert the first deep groove ball bearing from the top of the first rotating shaft and connect it to the shaft through an interference fit. The outer ring is connected to the rotary positioning plate through a groove. The edge of the rotary positioning plate is placed on the positioning support module to serve as a temporary support. At the same time, connect the positioning joint to the positioning rod with screws, and then connect the positioning rod to the rotating shaft with screws through an elbow to complete the preliminary assembly of the rotary positioning module.

[0083] Next, the bottom of the second rotating shaft in the gear transmission module is connected to the second deep groove ball bearing through an interference fit. The second spur gear is inserted through the top of the second rotating shaft. The gear is positioned circumferentially and axially using a key, a shaft shoulder, and a second ball bearing, completing the assembly of one gear shaft. Finally, the three assembled gear shafts (the number of gears can be adjusted according to the size of the circulating water tank) are inserted into the bearing support plate, completing the assembly of the gear transmission module.

[0084] Furthermore, the gear shafts of the multi-directional upstream seabed simulation module and the rotary positioning module are respectively inserted into the bearing support plate placed on the bottom of the circulating water tank, and vertical positioning is achieved through the second deep groove ball bearing and the support plate groove.

[0085] Next, the neck flange, three-way force sensor, connecting pile, and connecting fixture are bolted together in sequence to complete the assembly of the rigid boundary constraint connection module. Simultaneously, the assembled deep-sea π-type jumper model is fixed to the rigid boundary constraint connection module with screws.

[0086] Then, the connecting piles of the connected π-type jumper pipe model are fixed to the baffle of the multi-directional headwind seabed simulation module by bolts to complete the preliminary assembly of the entire model and the device.

[0087] Further, rotate the baffle of the multi-directional flow-facing submarine simulation module to ensure the correct engagement and transmission of the gear transmission module, and then adjust the π-type jumper tube plane to the 0° flow-facing position. At this time, manually adjust the position of the rotating positioning plate so that the positioning joint coincides with the edge positioning hole on the positioning plate. At this time, adjust the position of the positioning support module, connect the rotating positioning module and the positioning support module together with bolts, and then adjust the position of the positioning platform so that it coincides with the hole of the connecting joint at the bottom of the positioning support module. At this time, press the weight to realize the positioning of the support module, complete the assembly of the stabilization and fixing module, and realize the connection between the positioning support module and the stabilization and fixing module through bolts.

[0088] Finally, the locating joint on the rotary positioning module is screwed to the rotary positioning plate to complete the preparation for the 0° flow. After the entire experimental setup is installed, the device is debugged. After debugging is complete, the experimental setup can be started and tested according to the specific operating conditions and experimental technical requirements. To achieve different operating angles, simply change the angle of the locating joint on the rotary positioning plate. This angle change is transmitted through a gear transmission, ultimately achieving the multi-directional flow model.

[0089] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0090] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed, characterized by: include: Deep sea π-type jumper model (1), rigid boundary constraint connection module (2), multi-directional upstream seabed simulation module (7), gear transmission module (6), bearing support module (8), rotation positioning module (3), positioning support module (4), stabilization and fixing module (5), host computer control module (9) and measurement module (10); The two ends of the deep-sea π-type jumper pipe model (1) are connected to the rigid boundary constraint connection module (2), the rigid boundary constraint connection module (2) is fixedly arranged on the multi-directional flow-upstream seabed simulation module (7), and the multi-directional flow-upstream seabed simulation module (7) is slidably arranged at the bottom of the circulating water tank; the multi-directional flow-upstream seabed simulation module (7) is meshed and connected with the rotation positioning module (3) through a gear transmission module (6), the rotation positioning module (3) is rotationally connected to the positioning support module (4), the positioning support module (4) is fixedly arranged on the stabilization fixing module (5), and the gear transmission module (6), the multi-directional flow-upstream seabed simulation module (7) and the rotation positioning module (3) are rotationally arranged in the bearing support module (8); the host computer control module (9) sets the test conditions, and the measurement module (10) completes the dynamic strain and force response measurement of the deep-sea π-type jumper pipe model (1).

2. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: A deep-sea π-type jumper pipe model (1) comprises a central pipe (11), a pipe joint (12), a heat shrink tube (13) and a fiber Bragg grating strain string (14); two pairs of the fiber Bragg grating strain strings (14) are respectively pasted and pre-buried on the surface of each section of the central pipe (11) in the plane of the π-type jumper pipe and perpendicular to the plane, and the heat shrink tube (13) wraps the central pipe (11) and the fiber Bragg grating strain strings (14).

3. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: The rigid boundary constraint connection module (2) comprises a neck flange (21), a three-force sensor (22), a connecting pile (23), and a connecting fixture (24); the end of the deep-sea π-type jumper pipe model (1) is fixedly connected to the neck of the neck flange (21); the flange plate of the neck flange (21) is fixedly connected to the three-force sensor (22); the three-force sensor (22) is fixed to the vertical panel of the connecting pile (23); and the connecting pile (23) is fixedly arranged on the multi-directional headstream seabed simulation module (7).

4. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: The rotary positioning module (3) comprises: a rotary positioning plate (31), a first rotary shaft (32), a first spur gear (36), a first ball bearing (37), an elbow (35), a positioning rod (33), a positioning joint (34), and a first deep groove ball bearing (38); The first spur gear (36) and the first rotating shaft (32) are connected by a key to achieve circumferential positioning; the first spur gear (36) and the first rotating shaft (32) are in contact with the ball through the groove to achieve axial positioning; the first rotating shaft (32) and the inner ring of the first deep groove ball bearing (38) at the top of the first rotating shaft (32) are connected by interference fit; the first deep groove ball bearing (38) at the top of the first rotating shaft (32) is positioned on the rotating positioning plate (31) through the groove; the first rotating shaft (32) and the positioning rod (33) are fixedly connected through the elbow (35); the first rotating shaft (32) and the positioning rod (33) are rotated in an axis system to achieve an angle conversion function; the positioning rod (33) is fixedly connected to the rotating positioning plate (31) through the positioning joint (34) to achieve positioning after rotation.

5. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: The positioning support module (4) comprises: a connecting joint (42), a main support column (41), and a side support column (43); The two ends of the main support column (41) are respectively fixedly connected to the connecting joints (42); the other end of the connecting joint (42) at the upper end of the support column is fixed to the rotation positioning module (3), and the other end of the connecting joint (42) at the lower end is fixed to the stabilization and fixing module (5); the side support column (43) is fixed on the main support column (41).

6. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: The stabilization and fixing module (5) comprises: a positioning platform plate (51) and a weight (52); the positioning platform plate (51) determines its position according to the position of the support column of the positioning support module (4), and after being fixed to the connecting joint (42) of the positioning support module (4), the weight (52) is placed on it.

7. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: The gear transmission module (6) comprises: a second spur gear (61), a second rotating shaft (62), and a second ball (63); the second spur gear (61) and the second rotating shaft (62) are connected by a key to achieve circumferential positioning; the shoulders of the second spur gear (61) and the second rotating shaft (62) contact the second ball (63) through their respective grooves to achieve axial positioning; the first spur gear (36) in the rotation positioning module (3) is engaged with the first second spur gear (61) in the gear transmission module (6), and multiple second spur gears (61) in the gear transmission module (6) are engaged with each other, thereby achieving the transmission of angle transformation in the rotation positioning module (3).

8. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: The multi-directional headwind seabed simulation module (7) comprises: a baffle (71), a support leg (72), a roller (73), a third rotating shaft (74), a circular connecting joint (75), a third spur gear (76), a third ball (77), and a square connecting joint (78); the support leg (72) is fixedly connected to the baffle (71) via the square connecting joint (78); the support leg (72) is rotationally connected to the roller (73); the middle portion of the baffle (71) is connected to the third rotating shaft (74); the middle portion of the baffle (71) is fixedly connected to the third rotating shaft (74); the middle portion of the baffle (71) is fixedly connected to the third spur gear (76 ... The rotating shaft (74) is fixedly connected to the baffle (71) through the circular connecting joint (75); the third spur gear (76) and the third rotating shaft (74) are connected by a key to achieve circumferential positioning; the shaft shoulders of the third spur gear (76) and the third rotating shaft (74) contact the third ball (77) through a groove to achieve axial positioning; the last second spur gear (61) in the gear transmission module (6) is meshed with the third spur gear (76) in the multi-directional upstream seabed simulation module (7).

9. The π-type jumper vortex-induced vibration bottom-mounted experimental device taking into account the influence of the seabed according to claim 1 is characterized in that: The bearing support module (8) includes a second deep groove ball bearing (81) and a bearing support plate (82); the inner ring of the second deep groove ball bearing (81) is connected to the rotation positioning module (3), the multi-directional upstream seabed simulation module (7) and the second rotating shaft (62) in the gear transmission module (6) through interference fit; the outer ring of the second deep groove ball bearing (81) is positioned on the bearing support plate (82) through a groove.

10. The bottom-mounted experimental device for π-type jumper vortex-induced vibration taking into account the influence of the seabed according to claim 1 is characterized in that: The measurement module (10) comprises a fiber Bragg grating demodulator (1001), an IO unit (1002), a storage unit (1003), a wireless unit (1004) and a receiving unit (1005); the fiber Bragg grating demodulator (1001) demodulates the vibration strain signal from the fiber Bragg grating strain string (14) distributed and pre-buried in the deep-sea π-type jumper pipe model (1); the IO unit (1002) converts the analog signal of the three-force sensor (22) of the rigid boundary constraint connection module (2) into a digital signal, which is synchronously stored by the storage unit (1003); and the wireless unit (1004) sends the stored data to the receiving unit (1005), thereby completing the dynamic strain and force response measurement.

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