Full-scale rigid riser model forced oscillation experimental device

Abstract

The present invention provides a forced oscillation experimental device for a real-scale rigid riser model, comprising: a control actuation module, a measurement and analysis module, a top fixed structure module, a slide module and a real-scale rigid riser test module; the slide module is slidably arranged on the top fixed structure module, the action end of the control actuation module is fixedly connected to the slide module, the slide module is fixedly connected to the real-scale rigid riser test module, the control actuation module performs forced oscillation on the real-scale rigid riser test model, and the measurement and analysis module collects and records the hydrodynamic load and forced oscillation displacement data of the real-scale rigid riser model under the forced oscillation state. The experimental device provided by the present invention has a light structure and is easy to implement, and can solve the problems of the previous forced oscillation experimental device having a bulky structure, serious free liquid surface interference, easy damage of sensors, and difficulty in carrying out forced vibration experiments of real-scale risers with high Reynolds numbers.

Description

Technical Field

[0001] The invention relates to the field of forced oscillation experimental devices, in particular to a full-scale rigid riser model forced oscillation experimental device. Background Art

[0002] Marine risers are typical slender rod structures, which are very susceptible to vortex-induced vibration under the action of ocean currents. The so-called vortex-induced vibration refers to the alternating discharge of vortices on both sides of the columnar structure under the action of water flow, which in turn generates periodically changing pulse forces. When this pulse force is close to a certain order of natural frequency of the columnar structure, it will induce a more significant vibration - vortex-induced vibration. Vortex-induced vibration is an important factor leading to fatigue damage of marine risers.

[0003] In order to study the characteristics of the hydrodynamic load mechanism under the vortex-induced vibration state, the slender riser is discretized into several rigid segments, and the vortex-induced vibration is regarded as a simple harmonic forced vibration. Based on this assumption, people have conducted forced oscillation experiments on rigid risers at different vibration frequencies and amplitudes, and established a library of hydrodynamic load coefficients required for the current empirical prediction of vortex-induced vibration through the rigid riser forced oscillation experiments.

[0004] So far, industry and academia have conducted many forced oscillation experiments on rigid risers, but they mainly focus on forced oscillation experiments on rigid risers under scaled low Reynolds number conditions. Ramnarayan Gopalkrishnan published a paper titled "Vortex-Introduced Forces on Oscillating Bluff Cylinders" at MIT in 1993. The diameter of the rigid riser is 2.54 cm and the length is 60 cm. The paper "Vortex-induced forces of crossflow and inlineoscillating bluff bodies at moderate Reynolds numbers" in the 86th issue of MarineStructures in 2022 is an experimental study on the hydrodynamic loads on cylinders. A single three-force sensor is used in this paper. One end of the sensor is connected to the trailer, and the other end is directly fixed to the cylindrical tube model. The overall structure is a cantilever structure. The diameter of the model is 3.81 cm and the length is 45.72 cm. In the high Reynolds number rigid riser experiment, a patent in 2011 (ZL201110232610.0) proposed an experimental method of using a dual-track to drive a horizontal rigid cylinder to forced oscillation in the cross-flow direction. In summary, the above methods have the following shortcomings: (1) The scaled model is too slender. For example, someone used a rigid riser with a diameter of 2.54 cm and a length of 60 cm. It is impossible to carry out the real-scale Reynolds-level riser forced oscillation experiment simulation, and scale effects are prone to occur; (2) The dual-track drive horizontal rigid cylinder oscillation has a bulky structure and there is a problem of synchronization of the two-track movement. A slight synchronization error will cause the three-force to bear a huge load and be damaged; (3) The dual-track drive horizontal rigid cylinder oscillation is limited by the depth of the pool and cannot be too deep from the free liquid surface. At this time, the free liquid surface effect is obvious, which will affect the accuracy of the hydrodynamic test; (4) The cantilever measurement form is used, and the three-force sensor will be subjected to bending moment. In the high Reynolds number real-scale riser experiment, it will greatly affect the experimental accuracy and damage the sensor. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a full-scale rigid riser model forced oscillation experimental device.

[0006] A full-scale rigid riser model forced oscillation experimental device provided by the present invention comprises: a control actuation module, a measurement and analysis module, a top fixed structure module, a slide frame module and a full-scale rigid riser test module;

[0007] The slide module is slidably arranged on the top fixed structure module, the action end of the control and actuation module is fixedly connected to the slide module, the slide module is fixedly connected to the full-scale rigid riser test module, the control and actuation module performs forced oscillation on the full-scale rigid riser test model, and the measurement and analysis module collects and records the hydrodynamic load and forced oscillation displacement data of the full-scale rigid riser model under the forced oscillation state.

[0008] Preferably, the top fixed structure module includes a frame structure workpiece, a long positioning flange plate, a linear rail and a first slider, a plurality of the long positioning flange plates are arranged in parallel on the frame structure workpiece, the linear rail is fixedly arranged on the long positioning flange plate, each linear rail is provided with a plurality of first sliders, and the slide module is fixedly connected to the first slider.

[0009] Preferably, the control actuation module includes a control system and an actuation device;

[0010] The actuating device includes a servo motor, a reducer, a motor adapter flange and a linear module. The driving end of the servo motor is connected to the motor adapter flange through the reducer. The motor adapter flange is connected to the linear module to drive the linear module to move. The linear module is fixedly connected to the slide module.

[0011] The control system includes an industrial computer, a motion controller and a driver. The driver is electrically connected to the servo motor. The industrial computer generates motion instructions, and the motion controller transmits the motion instructions to the servo motor through the driver.

[0012] Preferably, the full-scale rigid riser test module comprises a riser end truss structure, a model fixed flange plate, an upper baffle, a full-scale riser module, a lower baffle and a lower baffle circular flange;

[0013] One end of the riser end truss structure is fixedly connected to the slide module, the other end of the riser end truss structure is fixedly connected to the model fixed flange plate, the upper baffle plate is fixedly installed on the model fixed flange plate, one end of the full-scale riser model is fixedly installed on the model fixed flange plate, and the other end of the full-scale riser model is fixedly connected to the lower baffle plate and the lower baffle plate circular flange.

[0014] Preferably, the full-scale riser module comprises a hydrodynamic circular tube, a foam circular tube, an inner supporting square tube, a first stopper, a first end hinged flange plate, a first inner fixing workpiece, a first outer clamping flange plate, a second outer clamping flange plate, a second inner fixing workpiece, a second end hinged flange plate and a second stopper;

[0015] The first limit member is installed on the first end hinged flange plate, the first internal fixed workpiece is connected to the model fixed flange plate after passing through the first end hinged flange plate, the other end of the first internal fixed workpiece is fixedly connected to the first outer clamping flange plate and one end of the inner supporting square tube respectively, the other end of the inner supporting square tube is fixedly connected to the second outer flange plate and the second internal fixed workpiece, the second internal fixed workpiece is fixedly connected to the lower baffle plate and the circular flange of the lower baffle plate after passing through the second end hinged flange plate, and the second limit member is installed on the second end hinged flange plate; the sensor of the measurement and analysis module is arranged between the first end hinged flange plate and the first internal fixed workpiece, and between the second internal fixed workpiece and the second end hinged flange plate;

[0016] The foam round tube is sleeved on the surface of the inner supporting square tube, and the hydrodynamic round tube is sleeved on the surface of the foam round tube.

[0017] Preferably, the measurement and analysis module includes an acquisition computer, a synchronization board, a first three-force sensor and a second three-separation sensor; the acquisition computer respectively acquires the output signals of the first three-force sensor, the second three-separation sensor and the servo motor through the synchronization board.

[0018] Preferably, one end of the first internal fixed workpiece and the second internal fixed workpiece is square and embedded in the inner wall of the inner supporting square tube, and the other end of the first internal fixed workpiece and the second internal fixed workpiece is provided with four L-shaped boss corners, and the four L-shaped boss corners form a square groove, and the first three-force sensor and the second three-separation sensor are arranged in the square groove, and the four L-shaped boss corners pass through the L-shaped through holes provided on the first end hinged flange plate and the second end hinged flange plate.

[0019] Preferably, the foam tube is made of lightweight EPS foam, and the outer diameter of the foam tube is 2-5 mm smaller than the inner diameter of the hydrodynamic tube.

[0020] Preferably, the upper baffle is made of circular organic glass, and a square hole is opened in the middle of the upper baffle; the lower baffle is made of carbon fiber plate.

[0021] Preferably, the edges of the first end hinged flange plate and the second end hinged flange plate are semicircular, and the first end hinged flange plate and the second end hinged flange plate are in line contact with the inner wall of the hydrodynamic circular tube.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention can avoid the huge bending moment generated by the three-division force sensor of the full-scale riser under ultra-high Reynolds number, and effectively ensure the measurement accuracy of the hydrodynamic load.

[0024] 2. The present invention can avoid the disadvantages of dual-track driving and transmission synchronization causing damage to the three-force sensor.

[0025] 3. The present invention can avoid the problem that the liquid surface is seriously affected due to insufficient immersion in water when the rigid cylinder is horizontally dragged.

[0026] 4. The experimental device provided by the present invention has a light structure and is easy to implement. It can solve the problems of previous forced oscillation experimental devices, such as bulky structure, serious free liquid surface interference, easy damage to sensors, and difficulty in conducting high Reynolds number real-scale standpipe forced vibration experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 It is an isometric perspective view of the forced oscillation experimental device in the present invention;

[0029] Figure 2 It is an axonometric view of the top fixed structure module and an enlarged view of local parts in the present invention;

[0030] Figure 3 It is a schematic diagram of the actuation device of the control actuation module in the present invention;

[0031] Figure 4 This is a schematic diagram of a control system for actuation modules in the present invention;

[0032] Figure 5 It is an axial perspective view of the carriage module in the present invention;

[0033] Figure 6 It is an exploded view and partial parts diagram of a full-scale rigid riser test module in the present invention;

[0034] Figure 7 An exploded view of a full-scale riser module in the present invention;

[0035] Figure 8 This is a schematic diagram of the measurement and analysis module in the present invention;

[0036] Fig. 9 It is an axonometric stereogram of the internal fixing member in the present invention;

[0037] Fig.10 It is an axonometric stereogram of the end hinged flange plate of the present invention.

[0038] Description of reference numerals:

[0039] Top fixed structure module 1 Full scale riser module 23

[0040] Actuating device 2 Lower baffle 24

[0041] Sliding frame module 3; Lower baffle circular flange 25

[0042] Full-scale rigid riser test module 4 First stopper 26

[0043] Control system 5 First end hinged flange plate 27

[0044] Measurement and analysis module 6 First three-point force sensor 28

[0045] Frame structure workpiece 7 First internal fixed workpiece 29

[0046] Long strip positioning flange plate 8 First outer clamping flange plate 30

[0047] Linear track 9 Internal support square tube 31

[0048] First slide block 10 Second outer clamping flange plate 32

[0049] Linear module 11 Second internal fixed workpiece 33

[0050] Second slider 12 Second three-force sensor 34

[0051] Motor adapter flange 13 Second end hinged flange plate 35

[0052] Reducer 14 Second limiter 36

[0053] Servo motor 15 Foam tube 37

[0054] Rectangular truss 16 Hydrodynamic round tube 38

[0055] Mounting flange 17 Industrial computer 39

[0056] Slider adapter flange plate 18 Motion controller 40

[0057] Toggle plate 19 Driver 41

[0058] Riser end truss structure 20 Collection computer 42

[0059] Model fixing flange plate 21 Synchronous board 43

[0060] Upper baffle 22 DETAILED DESCRIPTION

[0061] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments 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 of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0062] The present invention introduces a full-scale rigid riser model forced oscillation experimental device, referring to Figure 1 As shown, it includes: a control and actuation module, a measurement and analysis module 6, a top fixed structure module 1, a slide module 3 and a full-scale rigid riser test module 4.

[0063] The top fixed structure module 1 is installed on the offshore towing tank trailer, one end of the slide module 3 is connected to the top fixed structure module 1 through the first slider 10, and the other end of the slide module 3 is fixedly connected to the full-scale rigid riser test module 4 through the bracket 19 by bolts. The actuation device 2 of the control actuation module is fixedly connected to the slide module 3, the control actuation module performs forced oscillation on the full-scale rigid riser test model, and the measurement and analysis module 6 collects and records the hydrodynamic load and forced oscillation displacement data of the full-scale rigid riser model under forced oscillation.

[0064] Reference Figure 2 As shown, the top fixed structure module 1 includes a frame structure workpiece 7, a long strip positioning flange plate 8, a linear rail 9 and a first slider 10. The frame structure workpiece 7 is welded with high-strength steel and welded into a rectangular shape. Four long strip positioning flange plates 8 are welded on the frame structure workpiece 7 and are parallel to each other. The gantry machine tool is used to accurately cut out a stepped interface. The linear rail 9 is fixedly set on the long strip positioning flange plate 8. The four linear rails 9 are made of stainless steel and are respectively attached to the middle position of the stepped interface of the four long strip positioning flange plates 8. They are fixedly connected with bolts to ensure that the four linear rails 9 are parallel with high precision. Two first sliders 10 are installed on each linear rail 9, and the slide module 3 is fixedly connected to the first slider 10.

[0065] Reference Figure 3 As shown, the control actuation module includes a control system 5 and an actuation device 2; the actuation device 2 includes a servo motor 15, a reducer 14, a motor adapter flange 13 and a linear module 11, the driving end of the servo motor 15 is connected to the motor adapter flange 13 through the reducer 14, the motor adapter flange 13 is connected to the linear module 11, drives the linear module 11 to move, and the linear module 11 is fixedly connected to the slide module 3.

[0066] Reference Figure 4As shown, the control system 5 includes an industrial computer 39, a motion controller 40 and a driver 41. The industrial computer 39 is electrically connected to the motion controller 40, and the motion controller 40 is electrically connected to the driver 41. The driver 41 is connected to the servo motor 15 through a power line and a feedback information line. The operator inputs a motion instruction on the industrial computer 39, such as forced oscillation frequency and amplitude information. The motion controller 40 sends the motion instruction to the servo motor 15 through the driver 41, and the servo motor 15 is actuated to drive the linear module 11 slider (the second slider 12) to move.

[0067] Reference Figure 5 As shown, the carriage module 3 includes a rectangular truss 16, a toggle plate 19, a slider transfer flange plate 18 and a mounting flange 17. The carriage module 3 is welded with high-strength steel, one end of which is welded to a rectangular truss 16, and the other end is a cantilever structure, and is reinforced with a toggle plate 19 to improve the bearing capacity of the end. A slider transfer flange plate 18 is welded in the middle of the carriage module 3 for connecting the second slider 12 of the actuating device. Four slider transfer flange plates 18 are welded to the rectangular truss 16 of the carriage module 3 according to the position of the first slider 10 of the top fixed structure module 1, for connecting the first slider 10.

[0068] Reference Figure 6 As shown, the full-scale rigid riser test module 4 includes a riser end truss structure 20, a model fixed flange plate 21, an upper baffle plate 22, a full-scale riser module 23, a lower baffle plate 24 and a lower baffle plate circular flange 25. The riser end truss structure 20 is welded with high-strength stainless steel profiles, and flange plates are welded at both ends. The flange plate at one end of the riser end truss structure 20 is fixedly connected to the slide module 3 by bolts, and the flange plate at the other end of the riser end truss structure 20 is bolted to the model fixed flange plate 21. The upper baffle plate 22 is fixed to the model fixed flange plate 21 by bolts. One end of the full-scale riser module 23 is fixedly installed on the model fixed flange plate 21 by bolts, and the bolts pass through the lower baffle plate circular flange 25 and the lower baffle plate 24 and are tightened on the full-scale riser module 23, so that the lower baffle plate circular flange 25 clamps and fixes the lower baffle plate 24 at the end of the full-scale riser module 23.

[0069] The upper baffle 22 is made of a circular organic glass plate with a square hole in the middle, and the diameter is 5D of the hydrodynamic tube 38. The upper baffle 22 can shield the riser end truss structure 20 from the flow field impact on the hydrodynamic tube 38, and can also ensure that the observation field is not blocked.

[0070] The lower baffle plate 24 is made of a circular carbon fiber plate, which can effectively reduce the mass of the cantilever end of the overall experimental structure and improve the overall natural frequency of the structure. At the same time, it can avoid the end turbulence from interfering with the experimental hydrodynamic test results.

[0071] The model fixed flange plate 21 is made of high-strength aluminum plate. The model fixed flange plate 21 is milled with a central boss by a machine tool, and four grooves are milled according to the shape of the mounting piece at the end of the actual scale riser module 23 for installation and positioning. The thickness of the central boss is consistent with the thickness of the baffle.

[0072] Reference Figure 7 As shown, the full-scale riser module 23 includes a hydrodynamic circular tube 38, a foam circular tube 37, an inner supporting square tube 31, a first stopper 26, a first end hinged flange plate 27, a first inner fixed workpiece 29, a first outer clamping flange plate 30, a second outer clamping flange plate 32, a second inner fixed workpiece 33, a second end hinged flange plate 35 and a second stopper 36. The measurement and analysis module 6 includes a first three-force sensor 28 and a second three-force sensor 34.

[0073] There are three first limit members 26, which are respectively installed at three 1 / 4 quadrants of the first end hinged flange plate 27. The first internal fixed workpiece 29 passes through the first three-force sensor 28 and is fixed to the first internal fixed workpiece 29 by bolts at the other end. The first internal fixed workpiece 29 is embedded in one end of the inner support square tube 31. The bolts pass through the four first outer clamping flange plates 30 and the inner support square tube 31, and are tightened on the first internal fixed workpiece 29, so that the inner support square tube 31 and the first internal fixed workpiece 29 are firmly together. At the same time, the second internal fixed workpiece 33 is also embedded in the other end of the inner support square tube 31, and the bolts pass through the four second outer clamping flange plates 32 and the inner support square tube 31, and are tightened on the second internal fixed workpiece 33, so that the inner support square tube 31 and the second internal fixed workpiece 33 are firmly together. The second three-force sensor 34 is installed on the second internal fixed workpiece 33 at one end by bolts, and the second end hinged flange plate 35 is installed at the other end. Then, the foam round tube 37 is tightly wrapped around the inner supporting square tube 31, and the hydrodynamic round tube 38 is connected to the first end hinged flange plate 27 and the second hinged flange plate through line contact. Three second stoppers 36 are installed at three 1 / 4 quadrants of the second end hinged flange plate 35, and cooperate with the first stopper 26 to limit the movement of the hydrodynamic round tube 38 along the length axial direction.

[0074] The foam tube 37 is made of lightweight EPS foam, and its outer diameter is about 2-5 mm smaller than the inner diameter of the hydrodynamic tube 38 , so as to discharge the fluid in the hydrodynamic tube 38 during the experiment and reduce the influence on the experimental hydrodynamic load measurement.

[0075] The inner supporting square tube 31 is made of lightweight carbon fiber material, which can reduce the mass of the riser model and the strength and quality condition of the overall experimental device. The hydrodynamic round tube 38 is made of lightweight carbon fiber material, which can reduce the mass of the riser model and reduce the strength requirements of the overall experimental device. The hydrodynamic round tube 38 can be selected according to the actual outer diameter of the riser, and the typical diameter can be 4.5 inches-20 inches.

[0076] Reference Figure 8 As shown, the measurement and analysis module 6 also includes a collection computer 42 and a synchronization board 43; the collection computer 42 collects the output signals of the first three-force sensor 28, the second three-separation sensor and the servo motor 15 through the synchronization board 43. The collection computer 42 synchronously measures and records the force signal output by the first three-force sensor 28 and the second three-force sensor 34 and the displacement signal output by the encoder of the servo motor 15 through the synchronization board 43.

[0077] Reference Fig. 9 As shown, the first internal fixed workpiece 29 is made of high-strength stainless steel, and the second internal fixed workpiece 33 is made of aluminum alloy. One end of the first internal fixed workpiece 29 and the second internal fixed workpiece 33 is square, embedded in the inner wall of the inner supporting square tube 31, and the other end of the first internal fixed workpiece 29 and the second internal fixed workpiece 33 is provided with four L-shaped boss corners, and the four L-shaped boss corners form a square groove, and the first three-force sensor 28 and the second three-separation sensor are arranged in the square groove, and the four L-shaped boss corners pass through the L-shaped through holes provided on the first end hinged flange plate 27 and the second end hinged flange plate 35.

[0078] Reference Fig.10 As shown, the first end hinged flange plate 27 and the second end hinged flange plate 35 are made of high-strength aluminum alloy. The edge of the flange plate is semicircular to ensure that when supporting the hydrodynamic circular tube 38, it is in linear contact with the inner wall of the hydrodynamic circular tube 38, thereby releasing the bending moment of the first three-force sensor 28 and the second three-force sensor 34 during the experiment, playing a role similar to that of a hinged boundary. The first end hinged flange plate 27 and the second end hinged flange plate 35 are provided with L-shaped through holes to allow the first internal fixed workpiece 29 and the second internal fixed workpiece 33 to pass through during installation without contacting the two flange plates. A strip gap is provided at the 1 / 4 quadrant of the flange plate for routing the signal output line of the three-force sensor.

[0079] The installation and implementation process of this example is as follows:

[0080] Before the formal experimental test, the various components of the experimental device are designed according to the actual diameter of the full-scale riser to be tested, the specific conditions of the test flow rate conditions, the size of the laboratory towing pool, and the economy of the experimental device. After the production of the experimental components is completed, the detailed installation steps are as follows:

[0081] First, the profile of the top fixed structure module 1 is welded according to the present invention, and the linear rail 9 and the first slider 10 are assembled, the slide module 3 is installed on the top fixed structure module 1, and the assembled device is installed as a whole on the marine engineering towing tank.

[0082] Secondly, assemble the full-scale riser module 23, fix the first internal fixed workpiece 29 and the second internal fixed workpiece 33 to the two ends of the inner support square tube 31 through the first external clamping flange plate 30 and the second external clamping flange plate 32 respectively; then install the first three-force sensor 28 and the second three-force sensor 34 on the first internal fixed workpiece 29 and the second internal fixed workpiece 33 respectively; then install the first limiter 26 on the first end hinged flange plate 27, and tighten the bolts on the first three-force sensor 28. Fit the foam round tube 37 tightly on the inner support square tube 31, and then push the hydrodynamic round tube 38 from the bottom to the first end hinged flange plate 27 and contact the first limiter 26, install the second end hinged flange plate 35 to the second three-force sensor 34, and install the second limiter 36 to prevent the hydrodynamic round tube 38 from moving axially.

[0083] Secondly, high-strength stainless steel profiles are used for welding, and bolts are used to connect the model fixing flange plate 21 to the riser end truss structure 20, and the upper baffle plate 22 is fixed to the model fixing flange plate 21 by bolts, and the real-scale riser module 23 is fixed to the model fixing flange by bolts. The bolts pass through the lower baffle circular flange 25 and the lower baffle plate 24 and are tightened on the real-scale riser module 23, so that the lower baffle circular flange 25 clamps and fixes the lower baffle plate 24 at the end of the real-scale riser module 23. The whole is installed on the slide module 3.

[0084] Then, install the control actuation module actuation device 2, fix the linear module 11 on the top fixed structure module 1 through the pressing block, connect the servo motor 15, the reducer 14 and the reducer 14 flange to the linear module 11 in sequence, and install the slider adapter flange plate 18 and the second slider 12. The servo motor 15 is connected to the driving force.

[0085] Finally, the feedback signals of the first three-force sensor 28, the second three-force sensor 34 and the servo motor 15 are connected to the measurement and analysis module 6. The industrial control computer 39, the motion controller 40 and the driver 41 are connected in communication. The experimenter clicks the acquisition computer 42 to start synchronous signal acquisition, enters the motion command in the industrial control computer 39, starts the trailer, and starts forcing the real-scale rigid riser to oscillate in the water with different amplitudes and frequencies. After the experiment, the collected hydrodynamic load and motion information of the real-scale rigid riser in the forced oscillation state are saved.

[0086] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0087] 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 can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A full-scale rigid riser model forced oscillation experimental device, characterized in that: include: A control and actuation module, a measurement and analysis module (6), a top fixed structure module (1), a slide module (3) and a full-scale rigid riser test module (4); The slide module (3) is slidably arranged on the top fixed structure module (1); the action end of the control actuation module is fixedly connected to the slide module (3); the slide module (3) is fixedly connected to the full-scale rigid riser test module (4); the control actuation module performs forced oscillation on the full-scale rigid riser model; and the measurement and analysis module (6) collects and records the hydrodynamic load and forced oscillation displacement data of the full-scale rigid riser model under forced oscillation state; The full-scale rigid riser test module (4) comprises a riser end truss structure (20), a model fixed flange plate (21), an upper baffle (22), a full-scale riser module (23), a lower baffle (24) and a lower baffle circular flange (25); One end of the riser end truss structure (20) is fixedly connected to the slide module (3), the other end of the riser end truss structure (20) is fixedly connected to the model fixed flange plate (21), the upper baffle plate (22) is fixedly mounted on the model fixed flange plate (21), one end of the full-scale rigid riser model is fixedly mounted on the model fixed flange plate (21), and the other end of the full-scale rigid riser model is fixedly connected to the lower baffle plate (24) and the lower baffle plate circular flange (25); The full-scale riser module (23) comprises a hydrodynamic circular tube (38), a foam circular tube (37), an inner supporting square tube (31), a first stopper (26), a first end hinged flange plate (27), a first inner fixing workpiece (29), a first outer clamping flange plate (30), a second outer clamping flange plate (32), a second inner fixing workpiece (33), a second end hinged flange plate (35) and a second stopper (36); The first stopper (26) is mounted on the first end hinged flange plate (27); the first internal fixed workpiece (29) passes through the first end hinged flange plate (27) and is connected to the model fixed flange plate (21); the other end of the first internal fixed workpiece (29) is fixedly connected to the first outer clamping flange plate (30) and one end of the inner supporting square tube (31), respectively; the other end of the inner supporting square tube (31) is fixedly connected to the second outer flange plate and the second internal fixed workpiece (33); the second internal fixed workpiece (33) passes through the second end hinged flange plate (35) and is fixedly connected to the lower baffle plate (24) and the lower baffle plate circular flange (25); the second stopper (36) is mounted on the second end hinged flange plate (35); the sensor of the measurement and analysis module (6) is arranged between the first end hinged flange plate (27) and the first internal fixed workpiece (29), and between the second internal fixed workpiece (33) and the second end hinged flange plate (35); The foam circular tube (37) is sleeved on the surface of the inner supporting square tube (31), and the hydrodynamic circular tube (38) is sleeved on the surface of the foam circular tube (37).

2. The full-scale rigid riser model forced oscillation experimental device according to claim 1, characterized in that: The top fixed structure module (1) comprises a frame structure workpiece (7), a long positioning flange plate (8), a linear track (9) and a first slider (10); a plurality of the long positioning flange plates (8) are arranged in parallel on the frame structure workpiece (7); the linear track (9) is fixedly arranged on the long positioning flange plate (8); a plurality of first sliders (10) are arranged on each linear track (9); and the slide module (3) is fixedly connected to the first slider (10).

3. The full-scale rigid riser model forced oscillation experimental device according to claim 1, characterized in that: The control actuation module comprises a control system (5) and an actuation device (2); The actuating device (2) comprises a servo motor (15), a reducer (14), a motor adapter flange (13) and a linear module (11); the driving end of the servo motor (15) is connected to the motor adapter flange (13) via the reducer (14); the motor adapter flange (13) is connected to the linear module (11) to drive the linear module (11) to move; and the linear module (11) is fixedly connected to the carriage module (3); The control system (5) comprises an industrial control computer (39), a motion controller (40) and a driver (41), wherein the driver (41) is electrically connected to the servo motor (15), the industrial control computer (39) generates a motion instruction, and the motion controller (40) transmits the motion instruction to the servo motor (15) via the driver (41).

4. The full-scale rigid riser model forced oscillation experimental device according to claim 1, characterized in that: The measurement and analysis module (6) comprises a collection computer (42), a synchronization board (43), a first three-force sensor (28) and a second three-force sensor (34); the collection computer (42) collects output signals of the first three-force sensor (28), the second three-force sensor (34) and the servo motor (15) respectively through the synchronization board (43).

5. The full-scale rigid riser model forced oscillation experimental device according to claim 4, characterized in that: One end of the first internal fixed workpiece (29) and the second internal fixed workpiece (33) is square and embedded in the inner wall of the inner supporting square tube (31); the other end of the first internal fixed workpiece (29) and the second internal fixed workpiece (33) is provided with four L-shaped boss corners, and the four L-shaped boss corners form a square groove; the first three-force sensor (28) and the second three-force sensor (34) are arranged in the square groove; the four L-shaped boss corners pass through the L-shaped through holes provided on the first end hinged flange plate (27) and the second end hinged flange plate (35).

6. The full-scale rigid riser model forced oscillation experimental device according to claim 1, characterized in that: The foam circular tube (37) is made of lightweight EPS foam, and the outer diameter of the foam circular tube (37) is 2-5 mm smaller than the inner diameter of the hydrodynamic circular tube (38).

7. The full-scale rigid riser model forced oscillation experimental device according to claim 1, characterized in that: The upper baffle plate (22) is made of circular organic glass, and a square hole is opened in the middle of the upper baffle plate (22); the lower baffle plate (24) is made of a carbon fiber plate.

8. The full-scale rigid riser model forced oscillation experimental device according to claim 1, characterized in that: The edges of the first end hinged flange plate (27) and the second end hinged flange plate (35) are semicircular, and the first end hinged flange plate (27) and the second end hinged flange plate (35) are in line contact with the inner wall of the hydrodynamic circular tube (38).

Images