Vortex-induced vibration experimental device for deep-sea riser model simulating internal wave and current effects

Abstract

The present invention relates to a vortex-induced vibration experimental device for a deep-sea riser model simulating the action of internal waves and currents in the field of marine engineering technology, comprising: a deep-sea riser model module, a data acquisition module, a drive module, a transmission module, and a base module; wherein the deep-sea riser model mechanism is fixed on the transmission module, the base module and the transmission module are vertically contacted and connected via sliding balls, and the drive module and the transmission module are horizontally and parallelly connected via gears. The base module is fixed on the steel lifting bottom of the laboratory water pool, and the measurement sensors of the data acquisition module are dispersedly arranged on the deep-sea riser model and the end of the riser model. The present invention has a stable structure, can effectively avoid the resonance phenomenon caused by the proximity of the device and the vortex-induced vibration frequency, has no auxiliary structures, and creates a clean flow field, and can obtain high-quality experimental data on the vortex-induced vibration of deep-sea risers under the action of internal waves.

Description

Technical Field

[0001] The invention relates to the technical field of ocean engineering, in particular to a deep-sea riser vortex-induced vibration experimental device implemented in an ocean engineering deep water pool and capable of simulating the action of internal waves and currents. Background Art

[0002] Internal waves are a typical severe ocean condition prevalent in density-stratified oceans. They are characterized by large amplitude, long duration, and nonlinearity. They are very frequent in the South my country Sea. They generate a unique bidirectional shear flow field. This internal wave-induced bidirectional shear flow field can not only cause severe shearing effects on deep-sea risers downstream, but can also induce highly complex vortex-induced vibrations (VIVs) downstream and across the flow. VIVs refer to the alternating release of vortices on either side of a columnar structure under the influence of water flow, generating periodic pulsating forces. When these pulsating forces approach a certain natural frequency of the columnar structure, they induce significant VIVs (VIVs). VIVs are a key factor in fatigue damage to marine risers. Currently, fundamental understanding of the VIV characteristics of marine risers under internal wave influence is still lacking. Therefore, developing a reliable experimental setup for VIVs of deep-sea risers under internal wave influence is crucial for studying VIVs induced by internal waves.

[0003] Currently, domestic and international academic and engineering communities primarily rely on experimental methods to study the vortex-induced vibration phenomenon of marine risers. However, experimental technology for vortex-induced vibration of deep-sea risers under internal wave action is very limited. In general, the existing technology provides vortex-induced vibration experimental platforms that can simulate the vortex-induced vibration of tension leg tendons under internal wave action. The main deficiencies are: 1. The device is relatively complex and bulky, inconvenient to install, and requires a large motor power; 2. The device is unstable and the natural frequency easily falls within the significant frequency range of vortex-induced vibration, causing resonance and affecting the accuracy of the experiment; 3. The structural cantilever is very long, posing a risk of structural instability; 4. The cantilever structure can disrupt the flow field during operation, making the flow field less than ideal and clean, affecting the test results. For example, publication number CN 105547623A discloses a tension leg vortex-induced vibration test device under bidirectional shear flow and bidirectional stepped shear flow, including: a tension leg model mechanism, a measurement and analysis module, a drive module, a cantilever module, a bottom support module, a flow blocking module, and a chute module. The tension leg model mechanism is fixed to the cantilever module via a specially designed fixed end. The bottom support module, drive module, and cantilever module are connected vertically in pairs. The baffle module is fixed to the cantilever module via brackets. The bottom support module is fixed to the steel lifting bottom of the tank via high-strength bolts. The chute module is also bolted to the bottom support module. The cantilever is rotated by the drive module. The measurement and analysis module's various measuring instruments are dispersed within the tension leg model structure and the cantilever module. This patented technology suffers from at least one of the aforementioned issues. Summary of the Invention

[0004] In response to the deficiencies in the above-mentioned prior art, the present invention aims to provide an experimental device that can stably simulate the internal wave secondary bidirectional shear flow field encountered by deep-sea risers through structural optimization design, thereby solving the problems of existing shear flow field simulation devices such as instability, easy resonance, and frequent flow field interference.

[0005] The present invention provides a vortex-induced vibration experimental device for a deep-sea riser model simulating the action of internal waves and currents, comprising a deep-sea riser module, a transmission module, a drive module, a support and limit module, and a data acquisition module;

[0006] The deep-sea riser module includes a deep-sea riser model, the transmission module includes a driven wheel and a transmission chain, the driven wheel is an annular structure with an I-shaped cross-section, the driven wheel is provided with an outer peripheral groove and an inner peripheral groove in the radial direction, the transmission chain is embedded in the outer peripheral groove, the two ends of the deep-sea riser model are respectively fixed to the upper end surface of the driven wheel, the central axis of the deep-sea riser model is located vertically above the radial line of the driven wheel, the driving module includes a driving sprocket and a driving mechanism for driving the driving sprocket to rotate, the driving sprocket is meshed with the transmission chain for transmission, the support and limit module includes a support base, a ball and a limiter, a plurality of the support bases are fixed to the lifting bottom plate of the experimental water tank in a circular manner, the ball and the limiter are provided on the end surface of each support base, the ball is rotatable, the driven wheel is supported on the ball, and one end of the limiter contacts the inner peripheral groove and limits the driven wheel;

[0007] The measuring instruments of the data acquisition module are dispersedly arranged on the deep-sea riser model and the transmission module. The driving module drives the transmission module to rotate, thereby causing the deep-sea riser model fixed on the transmission module to produce relative movement simulating internal wave shear flow.

[0008] In some embodiments, the deep-sea riser module further includes a tensioning and fixing mechanism and a rigid hinge mechanism, wherein the tensioning and fixing mechanism and the rigid hinge mechanism are respectively fixed on the disk surface of the driven wheel disk, and the two ends of the deep-sea riser model are respectively fastened to the tensioning and fixing mechanism and the rigid hinge structure, and the tension of the deep-sea riser model is adjusted by the tensioning and fixing mechanism.

[0009] In some embodiments, the tensioning and fixing mechanism includes a first clamp, a first universal joint, a movable slider, a linear guide, a first fixed seat, a tensioning screw, a spring and a jackscrew, wherein two ends of the first clamp are respectively connected to the deep-sea riser model and the first universal joint, the other end of the first universal joint is connected to one end of the tensioning screw, the tensioning screw is nested with the movable slider, the movable slider is slidably connected to the linear guide, the first fixed seat is connected to one end of the linear guide to form an L-shaped structure, the first fixed seat and / or the linear guide is fixed to the disk surface of the driven pulley, the other end of the tensioning screw passes through the first fixed seat and is threadedly connected to the jackscrew, the spring is sleeved on the tensioning screw and is located between the first fixed seat and the jackscrew, rotating the jackscrew causes the spring to expand and contract, and the movable slider is driven to slide along the linear guide through the tensioning screw, thereby driving the deep-sea riser model to move linearly through the first universal joint and the first clamp, thereby adjusting the tensioning force of the deep-sea riser model.

[0010] In some embodiments, the rigid articulated mechanism includes a second clamp, a second universal joint, and a second fixed seat, one end of the second clamp clamps and fixes the deep-sea riser model, the other end of the second clamp is connected to the second universal joint through the tension sensor in the data acquisition module, the other end of the second universal joint is connected to the second fixed seat, and the second fixed seat is fixedly connected to the upper end surface of the driven pulley.

[0011] In some embodiments, the limiter includes a bearing, a slide, a slider and a positioning rod. The slide is fixed to the upper end surface of the support base, the slider is slidably connected to the upper end surface of the slide, the bearing is rotatably connected to one end of the slider, and the other end of the slider is connected to the positioning rod. The positioning rod pushes the slider to slide linearly and position it, and the bearing is in rolling contact with the inner circumferential groove.

[0012] In some embodiments, the support and limit module also includes a ball base, the ball base includes a rubber column and a bearing plate, the bottom end of the rubber column is fixed on the support base, the top end of the rubber column is connected to and supports the bearing plate, and the ball is rotatably connected to the bearing plate.

[0013] In some embodiments, each group of the ball bases includes a plurality of the rubber columns, and the plurality of rubber columns form a structure with a polygonal cross-section.

[0014] In some embodiments, the driving mechanism includes a sealed box, a driving motor, a reducer and a driving shaft. The driving motor and the reducer are located in the sealed box and are driven and connected. One end of the driving shaft is rotatably connected to the reducer, and the other end of the driving shaft extends outside the box body of the sealed box for rotatably connecting to the driving sprocket.

[0015] In some embodiments, the data acquisition module includes a measurement sensor system, an underwater video recording system, a data transmission system, and a data acquisition system. The measurement sensor system is used to obtain tension and response data information of the deep-sea riser model. The underwater video recording system is used to obtain underwater vibration video information of the deep-sea riser model. The data transmission system is used to transmit the data information detected and obtained by the measurement sensor system and the underwater video recording system to the data acquisition system. The data acquisition system stores and processes the received data information.

[0016] In some embodiments, the measurement sensing system includes a three-force meter sensor and a fiber Bragg grating strain sensor. The three-force meter sensor is a tension sensor connected between the second clamp 131 and the second universal joint 132. The fiber Bragg grating strain sensor is connected to the outer circumference of the deep-sea riser model. The underwater video recording system includes an underwater camera and an underwater lighting. The underwater camera and the underwater lighting are arranged around the periphery of the driven wheel.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The deep-sea riser model vortex-induced vibration experimental device for simulating the action of internal waves and currents provided in this embodiment is cleverly designed so that there are no auxiliary structural parts in the flow field area (i.e., in the driven impeller). The internal wave secondary flow field created is clean and ideal, which significantly improves the precision and accuracy of the experimental data.

[0019] 2. The experimental apparatus provided in this embodiment directly fixes the driven wheel that fixes the deep-sea riser model to the base. Compared with the prior art that adopts a cantilever structure, this not only effectively avoids structural instability caused by an excessively long cantilever during rotation, but also, due to the lack of a cantilever structure, the natural frequency of the deep-sea riser model deviates significantly from the overall natural frequency of the driven wheel, effectively avoiding the influence of resonance on the experimental accuracy.

[0020] 3. The experimental device provided in this embodiment forms a mechanical system with a large reduction ratio by rotating a large driven pulley with a small driving sprocket, thereby preventing the motor from bearing large torque and effectively reducing the torque requirement of the power system.

[0021] 4. The experimental device provided in this embodiment can perform rotation measurement for a long time, and the experimental data has good stability and high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 It is a schematic diagram of the overall structure of the experimental device of the present invention;

[0024] Figure 2 This is a schematic diagram of the front structure of the transmission module of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the transmission wheel of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the transmission chain of the present invention;

[0027] Figure 5It is a schematic diagram of the tensioning and fixing structure of the present invention;

[0028] Figure 6 It is a schematic diagram of the rigid hinge structure of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the driving mechanism of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the present invention in which the ball and the limiter are arranged on the support base;

[0031] Figure 9 It is a structural schematic diagram of the ball base of the present invention;

[0032] Figure 10 It is a structural diagram of the data acquisition module of the present invention;

[0033] Figure 11 This is a structural layout diagram of the fiber Bragg grating sensor of the present invention;

[0034] Figure 12 It is a structural arrangement diagram of the underwater video recording system of the present invention. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operating process. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

[0036] This embodiment provides a vortex-induced vibration experimental device for a deep-sea riser model simulating the effect of internal waves and currents. Figure 1-12As shown, the deep-sea riser module 1 includes a transmission module 2, a drive module 3, a support and limit module 4, and a data acquisition module 5. The deep-sea riser module 1 primarily comprises a deep-sea riser model 11, a tensioning and fixing mechanism 12, and a rigid hinge mechanism 13. The deep-sea riser model 11 is a rod-shaped riser, one end of which is connected to the tensioning and fixing mechanism 12 and the other end to the rigid hinge mechanism 13. The tensioning and fixing mechanism 12 and the rigid hinge mechanism 13 together provide tensioning and holding of the deep-sea riser model 11. In some embodiments, the tensioning and fixing mechanism 12 includes a first clamp 121, a first universal joint 122, a movable slider 123, a linear guide 124, a first fixing seat 125, a tensioning screw 126, a spring 127, and a jackscrew 128. The first fixing seat 125 is connected to the end of the linear guide rail 124 to form a substantially L-shaped structure. At least one of the first fixing seat 125 and the linear guide rail 124 is fixedly connected to the surface of the driven pulley 21 of the transmission module 2. The movable slider 123 is slidably connected to the linear guide rail 124. After the tensioning screw 126 is nested with the movable slider 123, one end of the tensioning screw 126 is connected to the first clamp 121 via the first universal joint 122. The other end of the tensioning screw 126 passes through the first fixing seat 125 and is threadedly connected to the push screw 128. The tensioning screw 126 is able to slide freely relative to the first fixing seat 125. The spring 127 is sleeved on the tensioning screw 126 and clamped between the push screw 128 and the first fixing seat 125. One end of the deep-sea riser model 11 can be fastened to the first clamp 121 by nesting or bolting. In some embodiments, the rigid articulated mechanism 13 primarily comprises a second clamp 131, a second universal joint 132, and a second fixing base 133. The second fixing base 133 is an L-shaped structural plate. The horizontal plate of the second fixing base 133 is located and fixed to the surface of the driven pulley 2 of the transmission module 2. The vertical plate of the second fixing base 133 is connected to the second universal joint 132. The second universal joint 132 is connected to one end of the second clamp 131 via a tension sensor in the data acquisition module 5. The other end of the second clamp 131 is used to clamp and connect to the other end of the deep-sea riser model 11.

[0037] The transmission module 2 mainly includes a driven disc 21 and a transmission chain 22 embedded in the driven disc 21. The driven disc 21 is an annular ring with an I-shaped cross section, and is radially formed with an outer peripheral groove 211 and an inner peripheral groove 212. The transmission chain 22 is embedded in the outer peripheral groove 211. The tensioning and fixing mechanism 12 and the rigid hinge mechanism 13 are mounted on the upper end surface of the driven disc 21. Specifically, the first fixing seat 125 and / or the linear guide 124 are fixed to the disc surface at one end of a certain radial line of the driven disc 21, and the second fixing seat 133 is fixed to the disc surface at the other end of the radial line of the driven disc 21. At this time, the axis of the deep-sea riser model 11 connected between the tensioning and fixing mechanism 12 and the rigid hinge mechanism 13 is located vertically above the radial line. That is, after the deep-sea riser model 11 moves vertically downward a predetermined distance, the central axis of the deep-sea riser model 11 coincides with the radial line of the driven disc 21.

[0038] The drive module 3 primarily comprises a drive sprocket 31 and a drive mechanism 32. The drive sprocket 31 is driven by the drive mechanism 32 to rotate in a horizontal plane. In some embodiments, the drive mechanism primarily comprises a sealed box 321, a drive motor 322, a reducer 323, and a drive shaft 324. The drive motor 322 is drivingly connected to the reducer 323 and is mounted within the sealed box 321. The sealed box 321 has two outlets: a cable outlet and an outlet for the drive shaft 324. The cable outlet is statically sealed with waterproof adhesive, while the outlet of the drive shaft 324 is dynamically sealed with a Varisil ring. One end of the drive shaft 324 is rotationally connected to the reducer 323, while the other end extends from the outlet of the sealed box 321 to the exterior of the sealed box 321. The drive sprocket 31 is sleeved onto the other end of the drive shaft 324 and rotates synchronously therewith. The driving sprocket 31 is meshed and connected to the transmission chain 22 embedded in the outer peripheral groove 211 , and the driven pulley 21 is driven to rotate by the meshing transmission between the driving sprocket 31 and the transmission chain 22 .

[0039] The support and limit module 4 mainly includes a support base 41, a ball 42 and a limiter 43. The support base 41 is fixed to the lifting base of the experimental water tank by high-strength bolts. The support base 41 arranged on the lifting base is in multiple groups and arranged in a circle. In some embodiments, the number of support bases 41 is 12-20 groups, preferably 16 groups, which are fixed on the lifting base in sequence at equal intervals and arranged in a circle. The top surface of each group of support bases 41 is provided with a ball 42 and a limiter 43. The ball 42 is rotatably connected to the top surface of the support base 41 and supports the driven wheel 21. The upper part of the rolling ball 42 is brought into rolling contact with the lower end surface of the driven wheel 21, which can significantly reduce contact friction and make the rotation smoother. In some embodiments, the ball 42 is rotatably arranged on the support base 41 through the ball base 44. The ball base 44 is mainly composed of a rubber column 441 and a bearing plate 442. A plurality of rubber columns 441 are fixed on the top surface of the support base 41 in a manner of forming a polygonal cross-section structure. For example, four groups of rubber columns 441 may form a rectangular cross-section structure. The load-bearing plate 442 is fixed on the top surface of the rubber column 441, and the ball 42 is rotatably connected to the load-bearing plate 442. The ball base formed by adopting the rubber column structure can achieve a good shock absorption effect. The limiter 43 is used to limit the driven wheel 21 to ensure that the driven wheel 231 always rotates smoothly around its center of circle to the greatest extent. In some embodiments, the limiter 43 includes a bearing 431, a slide 432, a slider 433 and a positioning rod 434. The slide 432 is located and fixed on the top surface of the support base 41, and the slider 433 is slidably connected to the upper end surface of the slide 432. A bearing 431 is rotatably connected to one end of a slider 433, and a portion of the outer circumferential surface of the bearing 431 extends beyond the end surface of the slider 433. The portion of the bearing 431 extending beyond the end surface of the slider 433 extends into the inner circumferential groove 212 of the driven pulley 21. The bearing 431 and the inner circumferential groove 212 are in rolling contact, for example, the circumferential surface of the bearing 431 and the bottom surface of the inner circumferential groove 212 are in rolling contact. The other end of the slider 433 is connected to a positioning rod 434. By driving the positioning rod 434, the slider 433 slides linearly along the slide 432, thereby maintaining the rolling contact between the bearing 431 and the inner circumferential groove 212.

[0040] The data acquisition module 5 includes a measurement sensor system 51, an underwater video recording system 52, a data transmission system 53, and a data acquisition system 54. The measurement sensor system 51 includes a three-force meter sensor 511 and a fiber Bragg grating strain sensor 512. The three-force meter sensor 511 is a tension sensor, disposed between the second fixture 131 and the second universal joint 132. One end of the three-force meter sensor 511 is connected to the second universal joint 132, and the other end is connected to one end of the second fixture 131. It is used to measure the tension information at both ends of the deep-sea riser model 11. The fiber Bragg grating strain sensor 511 is connected to the outer circumference of the deep-sea riser model 1 and is used to detect the strain signal generated by the deep-sea riser model 11 in response to the simulated shear flow. The underwater video recording system 52 mainly includes an underwater camera 521 and an underwater lighting 522. There are multiple groups of underwater cameras 521, which are evenly spaced around the periphery of the driven wheel 21. Accordingly, to meet underwater lighting requirements, multiple groups of underwater lighting lamps 522 are provided. The underwater video recording system 52 is primarily used to capture underwater vibration video information of the deep-sea riser model 11. The data transmission system 53 is used to transmit the tension and strain signals of the deep-sea riser model 11 detected and acquired by the measurement sensing system 51 and the underwater video recording system 52 to the data acquisition system 54, which stores and processes the received video and signals. The measuring instruments of the data acquisition module 5 are dispersed across the deep-sea riser model and the transmission module. The drive module drives the transmission module to rotate, thereby causing the deep-sea riser model structure fixed to the transmission module to generate relative motion that can simulate internal wave shear flow.

[0041] The working principle of the vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current provided in this embodiment is as follows:

[0042] The driven wheel 21, equipped with a built-in transmission chain 22, is placed on the ball bearing 42. After the drive sprocket 31 is meshed with the transmission chain 22, the slider 433 is adjusted to slide a predetermined distance along the slide 432 by adjusting the positioning rod 434, so that the bearing 431 and the inner groove 212 are in rolling contact, effectively limiting the position of the driven wheel 21. The deep-sea riser model 11 is clamped between the first clamp 121 and the second clamp 131, and the tension of the deep-sea riser model 11 is adjusted by rotating the top screw 128. The preset tension information of the deep-sea riser model 11 is transmitted to the measuring sensor 51 via the three-way force meter sensor 511. The lifting base of the experimental water tank is driven by an external device to a predetermined height, and then the corresponding amount of water is added.

[0043] The drive motor 322 rotates the drive shaft 324 through the reducer 323, which in turn drives the drive sprocket 31 mounted thereon to rotate horizontally. The rotating drive sprocket 31, through the meshing transmission chain 22, drives the driven pulley 21, which rolls on the ball bearings 22, to rotate horizontally in the water. The deep-sea riser model 11 rotates along with the driven pulley 21. During the rotation of the deep-sea riser model 11, the three-force dynamometer sensor 511 acquires tension information on the deep-sea riser model 11. The fiber grating sensor 512 acquires strain information during the underwater rotation of the deep-sea riser model 11. The underwater camera 521 captures underwater vibration video of the deep-sea riser model 11.

[0044] The vortex-induced vibration experimental apparatus for a deep-sea riser model, designed to simulate internal wave flow, is cleverly designed to eliminate any auxiliary structural components within the flow field (i.e., within the driven disc). The resulting internal wave secondary flow field is clean and ideal, significantly improving the precision and accuracy of experimental data. Furthermore, by directly securing the driven disc that holds the deep-sea riser model to a base, the experimental apparatus, unlike the prior art that uses a cantilever structure, not only effectively avoids structural instability caused by an excessively long cantilever during rotation, but also, due to the lack of a cantilever structure, significantly deviates between the natural frequency of the deep-sea riser model and the overall natural frequency of the driven disc, effectively preventing the impact of resonance on experimental accuracy. This avoidance of resonance stems from the fact that, when the riser model is longer, the cantilever structure must also increase in response, which results in a lower natural frequency of the overall cantilever, potentially approaching the natural frequency of the riser model. Consequently, during testing, the riser model and the cantilever resonate, affecting the riser dynamic response test results. Furthermore, the experimental device provided in this embodiment uses a small drive sprocket to drive a large driven pulley, creating a mechanical system with a high reduction ratio. This prevents the motor from experiencing excessive torque, effectively reducing the torque requirements of the power system. The experimental device provided in this embodiment is capable of performing rotational measurements for extended periods, resulting in stable and highly accurate experimental data.

[0045] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

[0046] 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.

[0047] 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 vortex-induced vibration experimental device for a deep-sea riser model simulating the action of internal waves and currents, characterized in that: It includes a deep-sea riser module (1), a transmission module (2), a drive module (3), a support and limit module (4), and a data acquisition module (5); The deep-sea riser module (1) includes a deep-sea riser model (11), the transmission module (2) includes a driven wheel (21) and a transmission chain (22), the driven wheel (21) is an annular structure with an I-shaped cross section, the driven wheel (21) is provided with an outer peripheral groove (211) and an inner peripheral groove (212) in a radial direction, the transmission chain (22) is embedded in the outer peripheral groove (211), the two ends of the deep-sea riser model (11) are respectively fixed on the upper end surface of the driven wheel (21), the central axis of the deep-sea riser model (11) is located vertically above the radial line of the driven wheel (21), the driving module (3) includes a driving sprocket (31) and a transmission chain (22) for driving the driving wheel (21). A driving mechanism (32) for rotating a driven sprocket (31), wherein the driving sprocket (31) is meshed with the transmission chain (22) for transmission, and the support and limit module (4) comprises a support base (41), a ball (42) and a limiter (43), wherein a plurality of the support bases (41) are fixed to the lifting bottom plate of the experimental water pool in a circular manner, and the end surface of each support base (41) is provided with the ball (42) and the limiter (43), wherein the ball (42) is rotatable, and the driven wheel (21) is supported on the ball (42), and one end of the limiter (43) contacts the inner peripheral groove (212) and limits the driven wheel (21); The measuring instruments of the data acquisition module (5) are dispersedly arranged on the deep-sea riser model (11) and the transmission module (2); the driving module (3) drives the transmission module (2) to rotate, thereby causing the deep-sea riser model (11) fixed on the transmission module (2) to generate relative motion simulating internal wave shear flow; The deep-sea riser module (1) further comprises a tensioning and fixing mechanism (12) and a rigid hinge mechanism (13), wherein the tensioning and fixing mechanism (12) and the rigid hinge mechanism (13) are respectively fixed on the disk surface of the driven wheel (21), and the two ends of the deep-sea riser model (11) are respectively fastened to the tensioning and fixing mechanism (12) and the rigid hinge mechanism (13), and the tension of the deep-sea riser model (11) is adjusted by the tensioning and fixing mechanism (12); The tensioning and fixing mechanism (12) includes a first clamp (121), a first universal joint (122), a movable slider (123), a linear guide rail (124), a first fixed seat (125), a tensioning screw (126), a spring (127) and a top screw (128), wherein the two ends of the first clamp (121) are respectively connected to the deep-sea riser model (11) and the first universal joint (122), the other end of the first universal joint (122) is connected to one end of the tensioning screw (126), the tensioning screw (126) is nested and connected to the movable slider (123), the movable slider (123) is slidably connected to the linear guide rail (124), the first fixed seat (125) is connected to one end of the linear guide rail (124) to form an L-shaped structure, and the The first fixing seat (125) and / or the linear guide rail (124) are fixed on the disk surface of the driven wheel disc (21), the other end of the tensioning screw (126) passes through the first fixing seat (125) and is threadedly connected to the top screw (128), the spring (127) is sleeved on the tensioning screw (126) and is located between the first fixing seat (125) and the top screw (128), the top screw (128) is rotated to make the spring (127) expand and contract, and the movable slider (123) is driven to slide along the linear guide rail (124) through the tensioning screw (126), and then the deep-sea riser model (11) is driven to move linearly through the first universal joint (122) and the first clamp (121), thereby adjusting the tension of the deep-sea riser model (11).

2. The vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current action according to claim 1 is characterized in that: The rigid articulated mechanism (13) comprises a second clamp (131), a second universal joint (132) and a second fixing seat (133), one end of the second clamp (131) clamps and fixes the deep-sea riser model (11), the other end of the second clamp (131) is connected to the second universal joint (132) via a tension sensor in the data acquisition module (5), the other end of the second universal joint (132) is connected to the second fixing seat (133), and the second fixing seat (133) is fixedly connected to the upper end surface of the driven wheel (21).

3. The vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current action according to claim 1 is characterized in that: The limiter (43) includes a bearing (431), a slide (432), a slider (433) and a positioning rod (434), wherein the slide (432) is fixed to the upper end surface of the support base (41), and the slider (433) is slidably connected to the upper end surface of the slide (432). The bearing (431) is rotatably connected to one end of the slider (433), and the other end of the slider (433) is connected to the positioning rod (434). The positioning rod (434) pushes the slider (433) to slide linearly and position it, and the bearing (431) is in rolling contact with the inner circumferential groove (212).

4. The vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current action according to claim 1 is characterized in that: The support and limit module (4) further includes a ball base (44), the ball base (44) including a rubber column (441) and a bearing plate (442), the bottom end of the rubber column (441) is fixed to the support base (41), the top end of the rubber column (441) is connected to and supports the bearing plate (442), and the ball (42) is rotatably connected to the bearing plate (442).

5. The vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current action according to claim 4 is characterized in that: Each group of the ball bases (44) includes a plurality of the rubber columns (441), and the plurality of the rubber columns (441) form a structure with a polygonal cross-section.

6. The vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current action according to claim 1 is characterized in that: The driving mechanism (32) comprises a sealing box (321), a driving motor (322), a reducer (323) and a driving shaft (324); the driving motor (322) and the reducer (323) are located in the sealing box (321) and are drivingly connected; one end of the driving shaft (324) is rotationally connected to the reducer (323); the other end of the driving shaft (324) extends outside the box body of the sealing box (321) and is used for rotationally connecting to the driving sprocket (31).

7. The vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current action according to claim 1 is characterized in that: The data acquisition module (5) includes a measuring sensor system (51), an underwater video recording system (52), a data transmission system (53) and a data acquisition system (54), wherein the measuring sensor system (51) is used to obtain the tension and response data information of the deep-sea riser model (11), the underwater video recording system (52) is used to obtain the underwater vibration video information of the deep-sea riser model (11), and the data transmission system (53) is used to transmit the data information detected and obtained by the measuring sensor system (51) and the underwater video recording system (52) to the data acquisition system (54), and the data acquisition system (54) stores and processes the received data information.

8. The vortex-induced vibration experimental device for a deep-sea riser model simulating internal wave and current action according to claim 7 is characterized in that: The measuring sensor system (51) includes a three-force meter sensor (511) and a fiber Bragg grating strain sensor (512), wherein the three-force meter sensor (511) is a tension sensor, and the fiber Bragg grating strain sensor (512) is connected to the outer peripheral surface of the deep-sea riser model (11). The underwater video recording system (52) includes an underwater camera (521) and an underwater lighting lamp (522), and the underwater camera (521) and the underwater lighting lamp (522) are arranged around the periphery of the driven wheel (21).

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