Test apparatus and test method for suppressing vortex-induced vibration of riser with helical plates under the action of top platform motion

Abstract

This invention provides a testing device and method for testing the vortex-induced vibration suppression efficiency of a water intake pipe with helical plates under the action of a top platform motion, relating to the field of vortex-induced vibration. The device includes a model mounting platform, a horizontal motion frame, an overall frame, a motion track, a transmission belt, a servo motor connector, a synchronous belt slider, and a servo motor. The horizontal motion frame is connected to the model mounting platform, the synchronous belt slider is in contact with the motion track, and the transmission belt and servo motor connector are connected to the overall frame. The servo motor controls the movement of the transmission belt through the servo motor connector, and the transmission belt is connected to the synchronous belt slider. This invention can achieve precise motion without relying on a large trailer and can simulate motion under flowing conditions in conjunction with a trailer. Sufficient space is reserved on the test model frame for installing sensors. This device can precisely move one end of the marine riser, and the suppression efficiency of the helical plates can be obtained through sensor analysis.

Description

Technical Field

[0001] This invention relates to the field of vortex-induced vibration, and more specifically, to a testing device and method for testing the vortex-induced vibration suppression efficiency of a water intake pipe with helical plates under the action of a top platform motion. Background Technology

[0002] Because many islands and reefs in the countries along the route are far from the mainland, they generally suffer from insufficient supply of resources such as electricity and fresh water, which seriously affects economic development and the quality of life for military and civilian personnel. The contradiction between resource demand and supply is becoming increasingly prominent. Fully developing the thermal energy hidden between the surface warm seawater heated by solar energy and the deep cold seawater at a depth of 800-1000 meters, i.e., ocean thermal energy difference, and comprehensively utilizing deep cold seawater resources, has unparalleled advantages in solving this contradiction.

[0003] One of the most crucial pieces of equipment in ocean thermal energy conversion (OTEC) technology and equipment is the large-diameter intake riser used to extract deep, cold seawater. Hidden beneath the water surface, the intake riser is the most vulnerable link in the entire system. When the top platform reciprocates under wave action, it inevitably causes the intake riser to sway back and forth in the seawater, creating a secondary oscillating flow around it. This oscillating flow further induces vortex-induced vibration in the intake riser, drastically altering the hydrodynamic load acting on it and leading to significant additional fatigue damage. How to suppress this vibration is a major concern in the industry. Current experimental research mainly focuses on the vortex-induced vibration suppression efficiency of risers under background uniform flow and shear flow. There is very little understanding and research on the vortex-induced vibration suppression efficiency of intake risers with helical plates under the motion of a floating top platform. Therefore, there is an urgent need to design an experimental device that can accurately simulate large-scale top platform motion to study the suppression characteristics of helical plates on the intake riser under such driving forces. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a testing device and method for testing the vortex-induced vibration suppression efficiency of a water intake pipe with spiral plates under the action of a top platform movement.

[0005] According to the present invention, a device for testing the vortex-induced vibration suppression efficiency of a water intake pipe with spiral plates under the action of a top platform includes a model mounting platform, a horizontal motion frame, an overall frame, a motion track, a transmission belt, a servo motor connector, a synchronous belt slider, and a servo motor. The horizontal motion frame is connected to the model mounting platform, the synchronous belt slider is in contact with the motion track, the transmission belt and the servo motor connector are connected to the overall frame, the servo motor controls the movement of the transmission belt through the servo motor connector, and the transmission belt is connected to the synchronous belt slider.

[0006] Preferably, the model mounting platform is equipped with a slider, and the horizontal motion frame is equipped with a slide rail. The slider is slidably connected to the slide rail. When the model mounting platform moves to a suitable position on the horizontal motion frame with the slider, the slider is fixed to the guide rail by a retainer, so that the model mounting platform and the horizontal motion frame remain stationary.

[0007] Preferably, the horizontal motion frame is provided with a slider mounting point, and a synchronous belt slider is installed on the slider mounting point. The synchronous belt slider is slidably connected to the overall frame and connected to the transmission belt. The synchronous belt slider drives the horizontal motion frame to move synchronously.

[0008] Preferably, the overall frame is provided with a motion track, and under the control of the servo motor, the horizontal motion frame is slidably connected to the overall frame through the cooperation of the synchronous belt slider and the motion track.

[0009] Preferably, the motion track includes a first motion track and a second motion track. The first motion track is connected to the upper side of the overall frame, and the second motion track is connected to the lower side of the overall frame. The second motion track is parallel to the transmission belt.

[0010] Preferably, the transmission belt is sleeved on the servo motor connector and performs cyclic reciprocating motion. The servo motor connector is connected to the servo motor, and the servo motor controls the movement of the transmission belt through the servo motor connector.

[0011] Preferably, the servo motor controls the movement of the transmission belt, the horizontal motion frame restricts the direction of movement through the overall frame, and the model mounting platform is controlled by the servo motor to move along with the horizontal motion frame.

[0012] Preferably, it also includes a spiral plate and a marine riser, with the spiral plate connected to the marine riser and the marine riser connected to the model mounting platform.

[0013] Preferably, the spiral plate is wrapped around the outer wall of the marine riser.

[0014] The present invention also provides a test method for a test device for the vortex-induced vibration suppression efficiency of a water intake pipe with a spiral plate under the action of a top platform. The device simulates the movement of a riser pipe with a spiral plate under the action of a top platform, and uses corresponding sensors to collect and analyze data to obtain the vortex-induced vibration suppression efficiency.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention has sufficient rigidity to avoid vibration of the moving device, and the test results obtained are more accurate; it is simpler than other similar devices, easy to disassemble, has sufficient reserved space, and can adapt to more working conditions; the test results are closer to the real situation.

[0017] (2) This invention can complete precise movement without relying on a large trailer, and can simulate movement in the presence of flow in conjunction with the trailer. Sufficient space is reserved on the test model frame to install sensors. The device can precisely drive one end of the marine riser to move. A series of test data can be measured by the sensors, and the suppression efficiency of the spiral plate can be obtained by analysis. Attached Figure Description

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

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the model and installation platform module of the present invention;

[0021] Figure 3 This is a top view of the overall structure of the present invention;

[0022] Figure 4 This is a front view of the overall structure of the present invention;

[0023] Figure 5 This is a side view of the overall structure of the present invention.

[0024] Numbering on the map:

[0025] 1. Vortex-induced vibration suppression device (spiral plate) 2. Marine riser (covered by 1, not visible in the figure) 3. Model mounting platform 4. Horizontal motion frame 5. Overall frame 6. Motion track 7. Transmission belt 8. Servo motor connector 9. Synchronous belt slider and transmission belt connecting plate 10. Servo motor. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0027] Example 1

[0028] This invention provides a testing device for suppressing vortex-induced vibration of a water intake pipe with spiral plates under the action of a top platform movement, such as... Figure 1-5As shown, the system includes a spiral plate 1, a marine riser 2, a model mounting platform 3, a horizontal motion frame 4, an overall frame 5, a motion track 6, a transmission belt 7, a servo motor connector 8, a synchronous belt slider 9, and a servo motor 10. The spiral plate 1 is wrapped around the outer wall of the marine riser 2, which is connected to the model mounting platform 3. The horizontal motion frame 4 is connected to the model mounting platform 3. The synchronous belt slider 9 is in contact with the motion track 6, and the transmission belt 7 is connected to the synchronous belt slider 9. The transmission belt 7 is sleeved on the servo motor connector 8 and performs cyclic reciprocating motion. The servo motor connector 8 is connected to the servo motor 10, and the servo motor 10 controls the movement of the transmission belt 7 through the servo motor connector 8.

[0029] The model mounting platform 3 is equipped with a slider, and the horizontal motion frame 4 is equipped with a slide rail. The slider is slidably connected to the slide rail. When the model mounting platform 3 moves to a suitable position on the horizontal motion frame 4 with the slider, the slider is fixed to the guide rail by a retainer, so that the model mounting platform 3 and the horizontal motion frame 4 remain stationary.

[0030] The horizontal motion frame 4 is equipped with a slider mounting point, on which a synchronous belt slider 9 is mounted. The synchronous belt slider 9 is slidably connected to the motion track 6 of the overall frame 5 and is connected to the transmission belt 7. Under the control of the servo motor 10, the horizontal motion frame 4 is slidably connected to the overall frame 5 through the cooperation of the synchronous belt slider 9 and the motion track 6. Preferably, the motion track 6 includes a first motion track 61 and a second motion track 62. The first motion track 61 is connected to the upper side of the overall frame 5, and the second motion track 62 is connected to the lower side of the overall frame 5. The second motion track 62 is parallel to the transmission belt 7.

[0031] Working principle: Servo motor 10 controls the movement of transmission belt 7, and horizontal motion frame 4 restricts the direction of movement through overall frame 5. Model mounting platform 3 is controlled by the movement of servo motor 10 along with horizontal motion frame 4.

[0032] Example 2

[0033] The present invention also provides a test method for the vortex-induced vibration suppression efficiency test device of the water intake pipe with spiral plates under the action of the top platform movement in Embodiment 1. The method simulates the movement of the riser pipe with spiral plates under the action of the top platform movement, and uses corresponding sensors to collect and analyze the data to obtain the vortex-induced vibration suppression efficiency.

[0034] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A device for testing the vortex-induced vibration suppression efficiency of a marine riser with helical plates under the action of a top platform motion, characterized in that, The system includes a model mounting platform (3), a horizontal motion frame (4), an overall frame (5), a motion track (6), a transmission belt (7), a servo motor connector (8), a synchronous belt slider (9), and a servo motor (10). The horizontal motion frame (4) is connected to the model mounting platform (3). The synchronous belt slider (9) is in contact with the motion track (6). The transmission belt (7) and the servo motor connector (8) are connected to the overall frame (5). The servo motor (10) controls the movement of the transmission belt (7) through the servo motor connector (8). The transmission belt (7) is connected to the synchronous belt slider (9). The model mounting platform (3) is provided with a slider, and the horizontal motion frame (4) is provided with a slide rail. The slider is slidably connected to the slide rail. When the model mounting platform (3) moves to a suitable position on the horizontal motion frame (4) with the slider, the slider is fixed on the slide rail by a fixing device, so that the model mounting platform (3) and the horizontal motion frame (4) remain stationary. The horizontal motion frame (4) is provided with a slider mounting point, and the synchronous belt slider (9) is installed on the slider mounting point. The synchronous belt slider (9) is slidably connected to the overall frame (5). The synchronous belt slider (9) is connected to the transmission belt (7). The synchronous belt slider (9) drives the horizontal motion frame (4) to move synchronously. The transmission belt (7) is sleeved on the servo motor connector (8) and performs a cyclic reciprocating motion. The servo motor connector (8) is connected to the servo motor (10). The servo motor (10) controls the movement of the transmission belt (7) through the servo motor connector (8). It also includes a spiral plate (1) and a marine riser (2), the spiral plate (1) being wrapped around the outer wall of the marine riser (2), and the marine riser (2) being connected to the model mounting platform (3).

2. The device for testing the vortex-induced vibration suppression efficiency of a marine riser with helical plates under the action of a top platform movement as described in claim 1, characterized in that, The motion track (6) is provided on the overall frame (5). Under the control of the servo motor (10), the horizontal motion frame (4) is slidably connected to the overall frame (5) through the cooperation of the synchronous belt slider (9) and the motion track (6).

3. The device for testing the vortex-induced vibration suppression efficiency of a marine riser with helical plates under the action of a top platform movement, as described in claim 2, is characterized in that... The motion track (6) includes a first motion track (61) and a second motion track (62). The first motion track (61) is connected to the upper side of the overall frame (5), and the second motion track (62) is connected to the lower side of the overall frame (5). The second motion track (62) is parallel to the transmission belt (7).

4. The device for testing the vortex-induced vibration suppression efficiency of a marine riser with helical plates under the action of a top platform movement as described in claim 1, characterized in that, The servo motor (10) controls the movement of the transmission belt (7), the horizontal motion frame (4) restricts the direction of movement through the overall frame (5), and the model mounting platform (3) is controlled by the movement of the servo motor (10) along with the horizontal motion frame (4).

5. A test method for a test device for suppressing vortex-induced vibration of a marine riser with helical plates under the action of a top platform according to any one of claims 1-4, characterized in that, The motion of the marine riser driven by the helical plate under the action of the top platform was simulated. The data was collected and analyzed using corresponding sensors to obtain the suppression efficiency of vortex-induced vibration.

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