Experimental device for vortex-induced vibration of riser pipes simulating shear flow and shear oscillation flow

Abstract

The present invention provides a standpipe vortex-induced vibration experimental device for simulating shear flow and shear oscillatory flow. The device comprises a standpipe model, a central rotation module, a tensioner module, a rigid fixing module, a slewing gear, an inner boundary elastic constraint module, an outer boundary elastic constraint module, a belt, a driving pulley, a base module, a power module, a host computer control module, and a measurement module. The driving pulley is mounted on the power module, and the belt is sleeved over the slewing gear and the driving pulley. The host computer control module is signal-connected to the power module. The standpipe model, the tensioner module, and the rigid fixing module are all signal-connected to the measurement module. The power module can drive the driving pulley to rotate, and the driving pulley can drive the slewing gear to rotate via the belt, thereby driving the standpipe model to rotate. The present invention is not prone to resonance and can controllably simulate steady and time-varying oscillatory flow fields, with conveniently adjustable flow field oscillation parameters.

Description

Technical Field

[0001] The present invention relates to a device in the field of marine engineering technology, in particular to a standpipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow implemented in a deep water tank of marine engineering. Background Art

[0002] Deep-sea risers in the marine engineering field are cylindrical structures. Under the influence of ocean currents, vortices alternately discharge from both sides of these cylindrical structures, generating periodic pulsating forces. When this pulsating force approaches a certain natural frequency of the cylindrical structure, it induces significant vibrations known as vortex-induced vibrations (VIVs). VIVs are a major factor in fatigue damage to marine risers.

[0003] As offshore oil and gas development expands into the deep sea, the high slenderness and flexibility of deep-sea risers lead to more pronounced and complex vortex-induced vibrations in complex marine environments. In real deep-sea environments, ocean current velocities also exhibit shear distribution along the depth.

[0004] Previous experimental research has typically used vortex-induced vibration (VIV) testing in indoor towing tanks. VIV experiments on shear flow and shear oscillatory flow risers have primarily focused on steady shear flow fields. To create a shear flow field, a 2010 patent (ZL201010552029.2) employed a large rotating platform to tilt the riser, while maintaining a minimum depth of water. This approach placed stringent requirements on both equipment and conditions. Meanwhile, a 2021 patent (ZL202110356080.4) employed a bottom-rotating mechanism to drive the riser, thereby simulating the shear flow field experienced by the riser. However, the bottom structure of this device disrupted the experimental flow field, and the experimental device presented the risk of structural resonance and instability, adversely affecting the experimental data. Furthermore, the device lacked the capability to simulate shear oscillatory flow.

[0005] Therefore, how to design a standpipe vortex-induced vibration experimental device that simulates shear flow and shear oscillation flow with a stable structure and can avoid the adverse effects of structural resonance and instability on experimental data is a technical problem that needs to be solved urgently. Summary of the Invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a standpipe vortex-induced vibration experimental device that simulates shear flow and shear oscillation flow.

[0007] According to the present invention, a standpipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow is provided, which includes a standpipe model, a central rotation module, a tensioner module, a rigid fixing module, a rotating gear, an inner boundary elastic constraint module, an outer boundary elastic constraint module, a belt, a driving pulley, a base module, a power module, a host computer control module, and a measurement module;

[0008] The two ends of the riser model are respectively connected to the tensioner module and the rigid fixing module; the tensioner module is fixed to the slewing gear, the rigid fixing module is fixed to the central rotating module, the slewing gear is fixed to the base module via the outer boundary elastic constraint module and the inner boundary elastic constraint module, and the base module and the central rotating module are fixed to the false bottom of the external offshore water tank;

[0009] The driving wheel is installed on the power module, and the belt is sleeved on the rotary gear and the driving wheel; the host computer control module is connected to the power module signal; the riser model, tensioner module and rigid fixing module are all connected to the measurement module signal;

[0010] The power module can drive the driving wheel to rotate, and the driving wheel can drive the rotating gear to rotate through a belt; and then drive the riser model to rotate.

[0011] Preferably, the riser model includes a central tube, a heat shrink tube, and a fiber Bragg grating strain string;

[0012] The fiber Bragg grating strain string is installed on the central tube, and the heat shrink tube wraps the central tube and the fiber Bragg grating strain string;

[0013] The central tube is connected to the measurement module signal via a fiber optic Bragg grating strain string.

[0014] Preferably, the central rotating module comprises a first base flange, a toggle plate, a central supporting shaft and a top rotatable flange;

[0015] The toggle plate is fixed to the central support shaft and then integrally connected to the first base flange, and the top of the central support shaft is connected to the top rotatable flange via a bearing;

[0016] The top rotatable flange is used to carry the rigid fixed modules.

[0017] Preferably, the tensioner module includes a first clamp, a first universal joint, a first three-force sensor, a movable slider, a first linear track, a screw, a screw adapter flange, a bottom fixed adapter flange, a first spring, a top plate and a top screw;

[0018] One end of the riser model is connected to the first clamp of the tensioner; the first clamp is connected to one end of the first universal joint; the first universal joint is bolted to the three-force sensor; the first three-force sensor is connected to one end of the screw; the middle part of the screw is connected to the movable slider through the screw adapter flange;

[0019] The first linear track is connected to the bottom fixed adapter flange; the other end of the screw is sleeved with a top screw, the top screw is abutted against one end of the first spring through the top plate, and the other end of the first spring is abutted against the baffle of the bottom fixed adapter flange;

[0020] The bottom fixed adapter flange is fixedly mounted on the rotary gear, and the first three-force sensor is electrically connected to the measurement module.

[0021] Preferably, the rigid fixing module comprises: a second clamp, a second universal joint, a second three-force sensor and a base fixing flange;

[0022] The other end of the riser model is connected to the second fixture, and the second fixture, the second universal joint, the second three-force sensor, and the base fixing flange are bolted together in sequence; the base fixing flange is installed on the central rotation module;

[0023] The second three-force sensor is electrically connected to the measurement module.

[0024] Preferably, the inner boundary constraint module comprises: an inner top bearing, an inner top flange block, a first bolt, a second spring, a second linear track, a slider and a second base flange;

[0025] The head of one end of the first bolt abuts against the second spring, the other end of the bolt is connected to the inner top flange block, the inner top flange block is bolted to the slider, and the second linear track is fixed to the second base flange;

[0026] The inner top bearing is installed at the end of the inner top flange block and abuts against the rotary gear.

[0027] Preferably, the outer boundary constraint module includes a downward bearing, a second bolt, a third spring and a downward flange block;

[0028] The down-pressure bearing is rigidly fastened to the down-pressure flange block, and the down-pressure bearing abuts against the rotary gear;

[0029] The head of one end of the second bolt abuts against the third spring, and the other end of the second bolt passes through the downward-pressing flange block and is fixed on the base module.

[0030] Preferably, the base module includes a support base, a bearing and a bearing base;

[0031] The support base is fixedly arranged on the lifting false bottom of the deep water pool of the external marine engineering. The bearing is connected to the support base through the bearing base, and the top of the bearing is in contact with the lower bottom surface of the rotating gear.

[0032] Preferably, the power module includes a servo motor, a reducer, a shaft structure, a bearing seat, a support structure and a third base flange;

[0033] The servo motor, reducer, shaft structure, and bearing seat are sequentially connected in a transmission manner; the bearing seat is fixed to the support structure, and the support structure is fixed to the false bottom of the external marine water tank through the third base flange;

[0034] The shaft structure is fixedly connected to the driving wheel.

[0035] Preferably, the outer edge of the rotary gear has a gear groove, and the gear in the gear groove is meshed with the geared belt;

[0036] The outer edge of the driving wheel is provided with a gear groove, and the gear in the gear groove is meshed with the toothed belt.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention solves the problems of existing shear flow and shear oscillation flow riser vortex-induced vibration experimental devices that are prone to instability and resonance, have many flow field interferences, are uncontrollable, and cannot simulate shear oscillation flow fields.

[0039] 2. The experimental device of the present invention has a simple structure, low complexity, and good structural stability, and will not cause structural instability caused by the overly long cantilever in traditional experimental technology.

[0040] 3. The natural frequency of the device provided by the present invention differs significantly from the significant period of vortex-induced vibration, making resonance less likely to occur. Furthermore, the device provided by the present invention lacks any additional structures inside the large rotary gear, resulting in a clean and ideal flow field. The device provided by the present invention can controllably simulate both steady and time-varying oscillating flow fields, and the flow field oscillation parameters can be easily adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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:

[0042] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0043] Figure 2 It is a three-dimensional schematic diagram of the tensioner module;

[0044] Figure 3 It is a schematic diagram of the rigid fixed module;

[0045] Figure 4 A three-dimensional schematic diagram of the central rotation module;

[0046] Figure 5This is a schematic diagram of the inner boundary elastic constraint module;

[0047] Figure 6 This is a schematic diagram of the outer boundary elastic constraint module;

[0048] Figure 7 This is a three-dimensional view of the riser module;

[0049] Figure 8 This is a three-dimensional view of the power module;

[0050] Figure 9 This is a three-dimensional view of the base module;

[0051] Figure 10 This is a schematic diagram of the host computer control module;

[0052] Figure 11 This is a schematic diagram of the measurement module;

[0053] Figure 12 is a three-dimensional view of the rotating gear;

[0054] Figure 13 is a three-dimensional view of the driving wheel;

[0055] Figure 14 A partial schematic diagram of the belt.

[0056] The figure shows:

[0057] DETAILED DESCRIPTION

[0058] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0059] The present invention provides a riser vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow, comprising a riser model 1, a central rotation module 4, a tensioner module 2, a rigid fixing module 3, a slewing gear 5, an inner boundary elastic constraint module 7, an outer boundary elastic constraint module 6, a belt 8, a driving pulley 9, a base module 11, a power module 10, a host computer control module 12, and a measurement module 13; the riser vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow is used to perform a model test on a deep-sea riser model 1; in a preferred example, the riser model 1 is a deep-sea riser model, the slewing gear 5 is a large slewing gear, and the belt 8 is a flexible metal wire.

[0060] The two ends of the riser model 1 are respectively connected to the tensioner module 2 and the rigid fixing module 3; the tensioner module 2 is fixed to the slewing gear 5 by bolts, the rigid fixing module 3 is fixed to the central rotating module 4 by bolts, the slewing gear 5 is fixed to the base module 11 by the outer boundary elastic constraint module 6 and the inner boundary elastic constraint module 7, and the base module 11 and the central rotating module 4 are fixed to the external offshore water tank false bottom by bolts;

[0061] The driving wheel 9 is mounted on the power module 10, and the belt 8 is mounted on the rotating gear 5 and the driving wheel 9. The host computer control module 12 is connected to the power module 10 by signal. The host computer control module 12 can control the power module 10 to operate at a set speed or sinusoidal oscillation time with different amplitudes and frequencies. The riser model 1, tensioner module 2, and rigid fixation module 3 are all connected to the measurement module 13 by signal. The measurement module 13 is used to complete the dynamic strain and force response measurement in the experiment. The power module 10 can drive the driving wheel 9 to rotate, and the driving wheel 9 can drive the rotating gear 5 to rotate via the belt 8. This in turn drives the riser model 1 to rotate, forming a relative shear flow or shear oscillation flow with the surrounding water. Ultimately, the shear flow and shear oscillation flow field experienced by the riser is simulated.

[0062] like Figure 7 As shown, the riser model 1 includes a central tube 46, a heat shrink tube 44 and a fiber Bragg grating strain string 45;

[0063] The fiber Bragg grating (FBG) strain gauge train 45 is mounted on the central tube 46. In a preferred embodiment, two pairs of FBG strain gauge trains are pre-embedded on the downstream and cross-stream surfaces of the central tube 46, respectively. The heat shrink tubing 44 wraps around the central tube 46 and the FBG strain gauge train 45. The central tube 46 is signal-connected to the measurement module 13 via the FBG strain gauge train 45.

[0064] like Figure 4 As shown, the central rotating module 4 includes a first base flange 29, a toggle plate 30, a central support shaft 31 and a top rotatable flange 32; the horizontal plane projection of the toggle plate 30 is a cross shape, the toggle plate 30 is welded and fixed to the central support shaft 31, and then welded as a whole to the first base flange 29, and the top of the central support shaft 31 is connected to the top rotatable flange 32 through a bearing; the top rotatable flange 32 is used to support the rigid fixed module 3.

[0065] like Figure 2As shown, the tensioner module 2 includes a first clamp 24, a first universal joint 23, a first three-force sensor 22, a movable slider 21, a first linear rail 19, a screw 17, a screw adapter flange 20, a bottom fixed adapter flange 18, a first spring 16, a top plate 15 and a top screw 14; the screw 17 is a long-axis screw.

[0066] One end of the riser model 1 is clamped to the first clamp 24 of the tensioner via screws. The first clamp 24 is connected to one end of the first universal joint 23 via a flange end plate. The other end of the first universal joint 23 is bolted to the three-force sensor 22 via a flange. The first three-force sensor 22 is bolted to one end of the screw rod 17 via a flange. The middle portion of the screw rod 17 is connected to the movable slider 21 via the screw adapter flange 20. Specifically, the screw adapter flange 20 is mounted on the screw rod 17, and the bottom end of the screw adapter flange 20 is bolted to the movable slider 21. The movable slider 21 is in contact with the linear track 19, i.e., the movable slider 21 can slide on the first linear track 19.

[0067] The first linear track 19 is bolted to the bottom fixed adapter flange 18. A jackscrew 14 is mounted on the other end of the screw rod 17. This jackscrew 14 abuts one end of the first spring 16 via the top plate 15. The other end of the first spring 16 abuts against the baffle 64 of the bottom fixed adapter flange 18. The elastic force of the spring 16 reacts against the top plate 15, transmitting the force to the riser model 1 and stretching it to provide pretension. The movable slider 21 is designed to guide and support the movement of the screw rod 17 when the pretension is adjusted using the jackscrew 14.

[0068] The bottom fixed adapter flange 18 is fixedly mounted on the rotary gear 5 , and the first three-force sensor 22 is electrically connected to the measurement module 13 .

[0069] like Figure 3 As shown, the rigid fixing module 3 includes: a second clamp 28, a second universal joint 27, a second three-force sensor 26 and a base fixing flange 25;

[0070] The other end of the riser model 1 is connected to the second clamp 28. The second clamp 28, the second universal joint 27, the second three-force sensor 26, and the base fixing flange 25 are bolted together in sequence. The base fixing flange 25 is bolted to the central rotation module 4. The second three-force sensor 26 is electrically connected to the measurement module 13.

[0071] like Figure 5As shown, the inner boundary constraint module 7 includes: an inner top bearing 36, an inner top flange block 35, a first bolt 33, a second spring 34, a second linear track 39, a slider 38 and a second base flange 37;

[0072] The head of one end of the first bolt 33 abuts against the second spring 34. The other end of the bolt 34 is connected to the inner top flange block 35. The inner top flange block 35 is bolted to the slider 38. The slider 38 can slide on the second linear track 39. In a preferred embodiment, the sliding is unidirectional. The second linear track 39 is fixed to the second base flange 37 by bolts.

[0073] The inner top bearing 36 is mounted at the end of the inner top flange block 35 and abuts against the slewing gear 5. The restoring force of the spring 34 acts against the inner top flange block 35, causing the inner top bearing 36 to press against the slewing gear 5, limiting its radial movement. The design of the slider 38 guides and supports the movement of the inner top flange block 35 while the restoring force of the spring 34 is adjusted using the first bolt 33.

[0074] like Figure 6 As shown, the outer boundary constraint module 6 includes a downward pressure bearing 43, a second bolt 40, a third spring 41 and a downward pressure flange block 42; the downward pressure bearing 43 is rigidly fastened to the downward pressure flange block 42, and the downward pressure bearing 43 is against the rotating gear 5; the head at one end of the second bolt 40 is against the third spring 41, and the other end of the second bolt 40 passes through the downward pressure flange block 42 and is fixed to the base module 11; the restoring force of the compressed spring 41 reacts on the downward pressure flange block 42, and then the downward pressure bearing 43 presses the large rotating gear 5, thereby limiting the vertical movement of the large rotating gear 5.

[0075] like Figure 9 As shown, the base module 11 includes a support base 53, a bearing 55, and a bearing base 54. The support base 53 is fixed to the lifting false bottom of an external marine engineering deep-water tank via high-strength bolts, thereby enabling the entire riser vortex-induced vibration experimental device for shear flow and shear oscillation flow to operate within the marine engineering deep-water tank. The bearing 55 is connected to the support base 53 via the bearing base 54, and the bearing base 54 and the support base 53 are connected to each other via bolts. The top of the bearing 55 contacts and connects with the lower surface of the slewing gear 5, reducing friction and ensuring smooth rotation of the slewing gear 5. Together with the outer boundary constraint module 6, it limits the vertical movement of the large slewing gear 5.

[0076] The power module 10 includes a servo motor 47, a reducer 48, a shaft structure 52, a bearing seat 51, a support structure 49, and a third base flange 50. In a preferred embodiment, the shaft structure 52 is an optical shaft. The servo motor 47, reducer 48, shaft structure 52, and bearing seat 51 are sequentially connected in a transmission manner. The bearing seat 51 is fixed to the support structure 49, and the support structure 49 is bolted to the external offshore water tank false bottom via the third base flange 50. The shaft structure 52 is fixedly connected to the driving wheel 9. The servo motor 47 is connected to the optical shaft 52 via the reducer 48, driving the driving wheel 9 to rotate, thereby driving the large rotary gear 5 to rotate, and ultimately driving the deep-sea riser model 1 to rotate, forming a relative shear flow or shear oscillation flow field with the surrounding water.

[0077] like Figure 10 As shown, the host control module 12 includes an industrial computer 56, a motion controller 57, and a driver 58. The operator inputs the steady speed or the oscillation velocity amplitude and oscillation velocity frequency period at the edge of the bidirectional oscillating flow field to the industrial computer 56. The industrial computer 56 issues a motion command to the motion controller 57. The motion controller 57 drives the power module servo motor 47 through the servo motor driver 58 to complete the set movement according to the motion command.

[0078] like Figure 11 As shown, the measurement module 13 includes a fiber Bragg grating demodulator 59, an I / O unit 60, a storage unit 61, a wireless unit 62, and a receiving unit 63. The fiber Bragg grating demodulator 59 demodulates the vibration strain signal from the fiber Bragg grating strain string 45 distributed and pre-buried in the deep-sea riser model. The I / O unit 60 converts the analog signals of the first three-force sensor 22 and the second three-force sensor 26 into digital signals, both of which are synchronously stored by the storage unit 61. The wireless unit 62 sends the stored data to the receiving unit 63, completing the dynamic strain and force response measurement.

[0079] The outer edge of the rotating gear 5 has a gear groove 65, which meshes with the geared belt 8. The gear groove 65 is used to limit the vertical movement of the flexible wire belt. The outer edge of the driving wheel 9 has a gear groove 66, and the teeth of the driving wheel 9 mesh with the toothed belt 8. The gear groove 66 is used to limit the vertical movement of the flexible wire belt.

[0080] The production and installation process of the present invention is as follows:

[0081] 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 riser, the specific test conditions, the size of the laboratory deep-water tank, and the economic feasibility of the experiment. The appropriate materials and dimensions of 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:

[0082] First, 20 independent base modules are assembled and secured to the steel lifting base of the laboratory pool, forming a circle with a diameter of 8 meters, which is the same diameter as the large slewing gear. The large slewing gear is then placed on the support base, and the 20 outer boundary constraint modules and 20 inner boundary constraint modules are installed to secure the large slewing gear. Specifically, when installing the inner boundary elastic constraint module 7, the second spring 34 is first compressed using the head of the first bolt 33. The inner boundary elastic constraint module 7 is then mounted on the base module 11. The head of the first bolt 33 is then slowly loosened until the inner top bearing 36 abuts against the slewing gear 5. When installing the outer boundary elastic constraint module 6, the downward pressure flange block 42 is first installed near the slewing gear 5. Then, by tightening the second bolt 40, the downward pressure bearing 43 is pressed down until it presses against the slewing gear 5. In a preferred embodiment, the downward pressure bearing 43 is loaded into the gear groove 65.

[0083] Secondly, weld the bottom flange, center support shaft and elbow plate of the center rotating module, and install the top rotating flange to the center support shaft through bearings to complete the assembly of the center rotating module. Use high-strength bolts to fix the center rotating module to the false bottom of the offshore water tank at the center position of the large rotating gear.

[0084] Next, the power module support structure is mounted on the pool's steel lifting false bottom via the base flange. The bearing housing, drive pulley, and optical shaft are then assembled, followed by the reducer and servo motor. A flexible metal belt is then tightly fitted into the grooves of the large slewing gear and drive pulley, completing the power system connection.

[0085] Finally, the first clamp 24, first universal joint 23, first three-force sensor 22, and screw 17 are assembled in sequence, completing the assembly of the tensioner module. The tensioner module is then secured to the large slewing gear via the base flange. The rigid mounting module, in turn, assembles the clamp, universal joint, three-force sensor, and base flange, and secures them to the central rotation module. The deep-sea riser model is clamped between the tensioner module and the rigid mounting module. Specifically, when installing the tensioner module 2, the top screw 14 is first rotated to compress the first spring 16. External force is then applied to secure screw 17, keeping it in place. The first clamp 24 is then connected to the riser model 1. The applied force is then released, allowing the reaction of the first spring 16 on the top plate 15 to drive screw 17, which in turn drives the first clamp 24, thereby tensioning the riser model 1.

[0086] After the overall installation of the experimental device is completed, the device is debugged. After the debugging is completed, the experimental device can be started to conduct tests according to specific working conditions and experimental technical requirements.

[0087] The present invention solves the problems of existing shear flow and shear oscillation flow riser vortex-induced vibration experimental devices that are prone to instability and resonance, have many flow field interferences, are uncontrollable, and cannot simulate shear oscillation flow fields. The experimental device of the present invention has a simple structure and low complexity; the device of the present invention is sturdy and has good structural stability, and will not cause structural instability caused by excessively long cantilevers in traditional experimental technologies. The natural frequency of the device of the present invention is significantly different from the significant period of vortex-induced vibration, and resonance is not easy to occur; the device provided by the present invention does not have any auxiliary structures on the inside of the large rotating gear, and the flow field is clean and ideal. The device provided by the present invention can controllably simulate steady and time-varying oscillating flow fields, and the flow field oscillation parameters can be conveniently adjusted.

[0088] In summary, the present invention has a stable structure, can avoid the resonance phenomenon caused by the device being close to the vortex-induced vibration frequency, has a smooth transmission, a clean flow field, and convenient changes in flow field parameters, and can obtain high-quality experimental test data of the riser vortex-induced vibration under shear flows of different intensities and shear oscillation flow fields.

[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 standpipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow, characterized in that: It includes a riser model (1), a center rotation module (4), a tensioner module (2), a rigid fixing module (3), a rotary gear (5), an inner boundary elastic constraint module (7), an outer boundary elastic constraint module (6), a belt (8), a driving wheel (9), a base module (11), a power module (10), an upper computer control module (12), and a measurement module (13); The two ends of the riser model (1) are respectively connected to the tensioner module (2) and the rigid fixing module (3); the tensioner module (2) is fixed on the slewing gear (5), the rigid fixing module (3) is fixed on the central rotating module (4), the slewing gear (5) is fixed on the base module (11) through the outer boundary elastic constraint module (6) and the inner boundary elastic constraint module (7), and the base module (11) and the central rotating module (4) are fixed to the false bottom of the external marine water tank; The driving wheel (9) is mounted on the power module (10), and the belt (8) is sleeved on the rotary gear (5) and the driving wheel (9); the upper computer control module (12) is connected to the power module (10) by signal; the riser model (1), the tensioner module (2) and the rigid fixing module (3) are all connected to the measurement module (13) by signal; The power module (10) can drive the driving wheel (9) to rotate, and the driving wheel (9) can drive the rotary gear (5) to rotate through the belt (8); and then drive the riser model (1) to rotate; The inner boundary elastic constraint module (7) comprises: an inner top bearing (36), an inner top flange block (35), a first bolt (33), a second spring (34), a second linear track (39), a slider (38) and a second base flange (37); The head of one end of the first bolt (33) abuts against the second spring (34), the other end of the first bolt (33) is connected to the inner top flange block (35), the inner top flange block (35) is bolted to the slider (38), and the second linear track (39) is fixed to the second base flange (37); The inner top bearing (36) is mounted on the end of the inner top flange block (35) and abuts against the rotary gear (5); The outer boundary elastic constraint module (6) includes a downward pressure bearing (43), a second bolt (40), a third spring (41) and a downward pressure flange block (42); The down-pressing bearing (43) is rigidly fastened to the down-pressing flange block (42), and the down-pressing bearing (43) abuts against the rotary gear (5); The head portion of one end of the second bolt (40) abuts against the third spring (41), and the other end of the second bolt (40) passes through the downward-pressing flange block (42) and is fixed to the base module (11); The base module (11) includes a support base (53), a bearing (55) and a bearing base (54); The support base (53) is fixedly arranged on the lifting false bottom of the external marine water tank, the bearing (55) is connected to the support base (53) through the bearing base (54), and the top of the bearing (55) is in contact with the bottom surface of the rotary gear (5).

2. The vertical pipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow according to claim 1 is characterized in that: The riser model (1) includes a central tube (46), a heat shrink tube (44) and a fiber Bragg grating strain string (45); The fiber Bragg grating strain string (45) is mounted on the central tube (46), and the heat shrink tube (44) wraps the central tube (46) and the fiber Bragg grating strain string (45); The central tube (46) is connected to the measurement module (13) via a fiber optic Bragg grating strain string (45).

3. The vertical pipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow according to claim 1 is characterized in that: The central rotating module (4) comprises a first base flange (29), a toggle plate (30), a central support shaft (31) and a top rotatable flange (32); The toggle plate (30) is fixed to the central support shaft (31), and then integrally connected to the first base flange (29), and the top of the central support shaft (31) is connected to the top rotatable flange (32) via a bearing; The top rotatable flange (32) is used to carry the rigid fixed module (3).

4. The vertical pipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow according to claim 1, characterized in that: The tensioner module (2) includes a first clamp (24), a first universal joint (23), a first three-force sensor (22), a movable slider (21), a first linear track (19), a screw (17), a screw adapter flange (20), a bottom fixed adapter flange (18), a first spring (16), a top plate (15) and a top screw (14); One end of the riser model (1) is connected to the first clamp (24) of the tensioner; the first clamp (24) is connected to one end of the first universal joint (23); the first universal joint (23) is bolted to the first three-force sensor (22); the first three-force sensor (22) is connected to one end of the screw (17); the middle part of the screw (17) is connected to the movable slider (21) through the screw adapter flange (20); The first linear track (19) is connected to the bottom fixed adapter flange (18); the other end of the screw rod (17) is sleeved with a top screw (14), the top screw (14) is against one end of the first spring (16) through the top plate (15), and the other end of the first spring (16) is against the baffle (64) of the bottom fixed adapter flange (18); The bottom fixed adapter flange (18) is fixedly mounted on the rotary gear (5), and the first three-force sensor (22) is electrically connected to the measurement module (13).

5. The vertical pipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow according to claim 1, characterized in that: The rigid fixing module (3) comprises: a second clamp (28), a second universal joint (27), a second three-force sensor (26) and a base fixing flange (25); The other end of the riser model (1) is connected to the second clamp (28), and the second clamp (28), the second universal joint (27), the second three-force sensor (26) and the base fixing flange (25) are bolted together in sequence; the base fixing flange (25) is installed on the central rotation module (4); The second three-force sensor (26) is electrically connected to the measurement module (13).

6. The vertical pipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow according to claim 1, characterized in that: The power module (10) includes a servo motor (47), a reducer (48), a shaft structure (52), a bearing seat (51), a support structure (49) and a third base flange (50); The servo motor (47), the reducer (48), the shaft structure (52), and the bearing seat (51) are sequentially connected in a transmission manner; the bearing seat (51) is fixed on the support structure (49), and the support structure (49) is fixed on the false bottom of the external marine water tank through the third base flange (50); The shaft structure (52) is fixedly connected to the driving wheel (9).

7. The vertical pipe vortex-induced vibration experimental device for simulating shear flow and shear oscillation flow according to claim 1, characterized in that: The outer edge of the rotary gear (5) is provided with a gear groove (65), and the teeth in the gear groove (65) are engaged with the toothed belt (8); The outer edge of the driving wheel (9) has a gear groove (66), and the teeth in the gear groove (66) are engaged with the toothed belt (8).

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