CN112146837A - Experimental device and method for simulating vibration slapping coupling response of submarine suspended span pipe - Google Patents
Experimental device and method for simulating vibration slapping coupling response of submarine suspended span pipe Download PDFInfo
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- CN112146837A CN112146837A CN202011011983.0A CN202011011983A CN112146837A CN 112146837 A CN112146837 A CN 112146837A CN 202011011983 A CN202011011983 A CN 202011011983A CN 112146837 A CN112146837 A CN 112146837A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
Abstract
The invention relates to an experimental device and method for simulating vibration slapping coupling response of a submarine span tube. The pretension setter presets tension for the suspended span pipe, and the gap between the suspended span pipe and the bottom wall can be changed by adjusting the length of the vertical rod of the supporting vertical rod; measuring the upstream incoming flow velocity by an acoustic Doppler velocimeter, synchronously monitoring the transverse vibration displacement and the position and the form of the bottom of a water tank flapped by a suspended span pipe by an underwater high-speed camera, monitoring the flow direction vibration displacement by the bottom high-speed camera, and monitoring the acting force of the suspended span pipe to flap the bottom wall of the water tank and the corresponding flapping position in real time by a transparent pressure sensing film; capturing streaming flow field information of the flow direction section of the suspended cross pipe at different positions of the pipe shaft by a particle imaging speed measuring camera; and (4) integrating vibration slapping and flow field information, and analyzing to obtain the suspended cross-tube vortex excitation dynamic response and tube bed slapping coupling action rule.
Description
Technical Field
The invention belongs to the field of submarine pipeline motion response experiment tests, and particularly relates to an experimental device and method for simulating submarine suspended span pipe vibration slapping coupling response.
Background
China has ocean territory of more than 300 square kilometers, oil and gas resource reserves are rich, and oil and gas exploitation has advanced to deep sea in order to relieve the energy crisis of China. Compared with ship transportation, the submarine pipeline has the advantages of high efficiency, low cost and stable output as a life line for marine oil and gas transportation. On one hand, the submarine pipelines are in a complex environment, and on the other hand, the submarine geological conditions are severe, and the topography is irregular, so that a large number of suspended sections often exist after the pipe laying is finished; on the other hand, the erosion of sea current also easily causes the sediment migration under the submarine pipeline to be intensified to form a suspended span. Under the action of ocean current, a suspended span section of a submarine pipeline is easy to induce vibration fatigue, and the service life of the suspended span section is influenced. Compared with a common marine riser, the seabed is arranged on the lower side of the submarine pipeline, an asymmetric boundary exists in the transverse direction, and the downward lifting force often causes the pipeline to collide with the seabed, so that the pipeline vibration is more complicated. In addition, the pipe bed collision even can make the pipeline take place to leak, causes huge economic loss, and the leakage of sea pipe not only can cause great incident, still can destroy marine environment. At present, related researches on the flexible suspended span pipe are few, and more rarely are experimental researches related to collision and vibration coupling effects, so that an experimental device and method for simulating vibration slapping coupling response of the submarine suspended span pipe are urgently needed to be designed to explore the vibration and pipe bed slapping coupling effect rule and mechanical behavior of the near-wall flexible suspended span pipe.
Disclosure of Invention
In order to solve the problems of the background art, the invention aims to provide an experimental device and method for simulating the vibration slapping coupling response of a submarine suspended span pipe.
An experimental device for simulating vibration slapping coupling response of a submarine suspended span pipe consists of a suspended span pipe module, a rotary supporting module, a tension testing module, a flow field monitoring module, a vibration slapping monitoring module and a data acquisition terminal, wherein a device main body except the data acquisition terminal is arranged in an experimental water tank. The suspended span pipe module comprises a suspended span pipe, a universal hinge and an end guide plate. The suspension pipe is arranged in parallel to the bottom wall of the water tank, one end of the suspension pipe is connected with a universal hinge fixed on the end guide plate to realize hinged constraint, and the other end of the suspension pipe penetrates through the other end guide plate to be connected with the traction steel wire. End deflectors are arranged at two ends of the suspension pipe to eliminate the end effect of the streaming.
The rotary supporting module consists of a supporting upright rod, a rotating disc, a corner instrument panel and a sliding truss. The sliding truss with the omega-shaped rail groove can slide on the end face of the upper wall of the water tank to provide support for the rotating disc and the supporting upright rod. The rotating disc is of two semicircular structures and is spliced and fixed through bolts, and an omega-shaped sliding rail groove is formed in the lower end face of the rotating disc. The supporting upright rods are of I-shaped structures, the upper ends of the two vertical upright rods on two sides are provided with arc-shaped omega-shaped rails which can be embedded into omega-shaped rail grooves of the rotating disc to freely rotate, the middle part of the middle cross beam of the supporting upright rods is provided with a pointer, and the pointer penetrates through the dial plate of the angle indicator to display the rotating angle; perpendicular pole setting in both sides of supporting the pole setting stretches into the aquatic and retrains the both ends of striding the pipe respectively to can adjust flexible length in order to adjust the clearance of striding pipe and basin bottom according to the experimental scheme, the perpendicular pole setting surface of supporting the pole setting is carved with the scale in order to measure the clearance of striding pipe and basin bottom.
The tension testing module comprises a pulley, a traction steel wire, a tension sensor and a pretension setting device. One end of the traction steel wire is connected with one end of the suspended span pipe, then the traction steel wire bypasses the pulley fixed at the bottom of the supporting vertical rod and is connected with the tension sensor, and the uppermost end of the traction steel wire is connected with the pre-tension setting device. The pretension setting device is fixed at the upper end of the supporting vertical rod, and the tension force can be preset for the suspended span pipe by adjusting the pretension setting device. The traction force in the horizontal direction can be converted into the tension force in the vertical direction through the pulleys on the premise that the tension force is not changed, and the tension sensor connected to the traction steel wire can monitor the axial tension force of the suspension cross pipe in real time and transmit data to the data acquisition terminal.
The flow field monitoring module consists of an acoustic Doppler velocimeter lifting rod, an acoustic Doppler velocimeter, a laser transmitter and a particle imaging velocimetry camera. The acoustic Doppler velocimeter is fixed on an acoustic Doppler velocimeter lifting rod, the acoustic Doppler velocimeter lifting rod is fixed on a sliding truss, the acoustic Doppler velocimeter is arranged on the upstream of a suspended span pipe and used for measuring the velocity distribution of incoming flow on the upstream of the suspended span pipe, and the acoustic Doppler velocimeter lifting rod can stretch out and draw back to realize the height adjustment of the acoustic Doppler velocimeter in the vertical direction. The laser emitter is arranged below the water tank, and the emitted laser lights tracing particles of a flow field around the suspension tube, so that the flow field capturing section is provided for the particle imaging speed measuring camera. The particle imaging speed measurement camera lens is arranged on one side of the water tank opposite to the laser section, the particle imaging speed measurement camera can capture flow field information of the laser section, and the collected flow field information is recorded through the data collection terminal. The streaming flow field information of any section of the suspended span pipe along the pipe shaft direction can be captured by adjusting the position of the laser transmitter.
The vibration slapping monitoring module comprises an underwater high-speed camera lifting rod, an underwater high-speed camera, a bottom high-speed camera and a transparent pressure-sensitive film. The upper end of the underwater high-speed camera lifting rod is fixed on the sliding truss and can move along the flow direction along with the sliding truss. The underwater high-speed camera lifting rod can stretch out and draw back, and the underwater high-speed camera is fixed at the lower end of the underwater high-speed camera lifting rod and is arranged at the downstream of the span pipe and used for synchronously monitoring the transverse vibration of the span pipe and recording the process of slapping the bottom wall of the water tank. The length of the lifting rod of the underwater high-speed camera is adjusted to enable the suspended span pipe to be located in the middle of a captured picture of a lens of the underwater high-speed camera, and then the distance between the sliding truss and the suspended span pipe is adjusted to enable the underwater high-speed camera to capture all monitoring points of the suspended span pipe and not to interfere with a wake flow field of the suspended span pipe. The bottom high-speed camera is arranged right below the suspended cross pipe and used for monitoring the flow direction vibration displacement of the suspended cross pipe. The transparent pressure-sensitive film is attached to the bottom wall of the water tank transparent glass at the lower side of the suspended span pipe so as to monitor the acting force of the suspended span pipe for slapping the bottom wall of the water tank and the corresponding slapping position in real time. Monitoring data of the underwater high-speed camera, the bottom high-speed camera and the transparent pressure-sensitive film are recorded through the data acquisition terminal.
An experimental method for simulating the vibration slapping coupling response of the submarine suspended span pipe is provided by using an experimental device for simulating the vibration slapping coupling response of the submarine suspended span pipe. And (3) opening a water channel gate to supply water, measuring the upstream incoming flow velocity through an acoustic Doppler velocimeter, and arranging a span pipe close to the bottom wall of the water channel to generate vortex-induced vibration under the action of water flow impact. The horizontal vibration displacement and the position and the form of the bottom of the water tank shot by the suspended span pipe are synchronously monitored by the underwater high-speed camera, the flow direction vibration displacement is monitored by the bottom high-speed camera, and the acting force of the suspended span pipe on the bottom wall of the water tank shot by the suspended span pipe and the corresponding shot position are monitored in real time by the transparent pressure sensing film. And the relative position of the laser transmitter is changed along the axial direction of the suspended span pipe, and the information of the streaming flow field of the suspended span pipe flowing to the cross section at different positions of the pipe shaft is captured by the particle imaging speed measuring camera. And then, processing the flow velocity data, the displacement data, the tension data, the patting force data and the flow field information obtained by the data acquisition terminal, and analyzing to obtain the suspended cross tube vortex excitation dynamic response and the tube bed patting coupling action rule. Keeping the incoming flow velocity of the water tank unchanged, presetting tension for the suspended span pipe through the pre-tension setter, and adjusting the telescopic length of the vertical rods on the two sides of the supporting vertical rod to change the gap between the suspended span pipe and the bottom wall, thereby testing the influence of the gap on the vibration response rule of the suspended span pipe and the slapping coupling rule of the pipe bed. The incoming flow velocity and the gap height are kept unchanged, the initial tension of the suspended span pipe is changed by adjusting the pre-tension setter, and the influence of the pre-tension on the vibration response of the suspended span pipe and the pipe bed slapping coupling effect and the change rule of the axial tension of the suspended span pipe during vortex-induced vibration are tested and analyzed. The influence of an incident flow attack angle on vibration and flapping of the suspended span pipe and the applicability of a normal flow velocity criterion when the flapping occurs are tested and analyzed by adjusting the rotating angle of the supporting vertical rod in the rotating disc.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the gap between the suspension pipe and the bottom bed can be adjusted through the supporting vertical rod, and the attack angle of incoming flow in the suspension pipe and the water tank can be adjusted through the rotating disc so as to meet the experimental working conditions under different gap ratios and the attack angles of the incoming flow;
2. the invention can preset and monitor the tension of the end part of the suspension span pipe, and can synchronously and continuously monitor the impact force and the impact position of the collision, thereby providing more acting force data for the analysis of experimental results;
3. the invention synchronously monitors the vibration displacement of the suspension tube in the transverse direction and the flow direction, and obtains the information of the streaming flow field of each section of the suspension tube along the axial direction through the particle imaging velocimeter.
4. The invention has rich monitoring experimental data and can better simulate the vibration response of the flexible suspension pipe and the characteristics of the patting bed.
Drawings
FIG. 1 is a view showing the overall arrangement of the apparatus of the present invention;
FIG. 2 is a schematic view of a suspended span tube module of the apparatus of the present invention;
FIG. 3 is an assembly view of the rotary support module of the apparatus of the present invention;
FIG. 4 is a schematic view of a tension testing module of the apparatus of the present invention;
FIG. 5 is a schematic view of the apparatus of the present invention illustrating the monitoring of the flow field around the flow;
FIG. 6 is a schematic view of a vibration slap monitoring module of the apparatus of the present invention;
wherein: 1. a suspended span tube; 2. a transparent pressure-sensitive film; 3. universal hinges; 4. an end deflector; 5. a pulley; 6. a traction wire; 7. a tension sensor; 8. a pre-tension setter; 9. supporting the upright stanchion; 10. rotating the disc; 11. a corner instrument panel; 12. a sliding truss; 13. an underwater high-speed camera lifting rod; 14. an underwater high-speed camera; 15. a bottom high speed camera; 16. an acoustic Doppler velocimeter lifting rod; 17. an acoustic doppler velocimeter; 18. a laser transmitter; 19. a particle imaging speed camera; 20. a data acquisition terminal; 21. a water tank.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, an experimental device for simulating a vibration slapping coupling response of a submarine suspended straddle pipe is composed of a suspended straddle pipe module, a rotary support module, a tension test module, a flow field monitoring module, a vibration slapping monitoring module and a data acquisition terminal 20, and a device main body except the data acquisition terminal 20 is arranged in an experimental water tank 21. As shown in fig. 2, the suspended span pipe module comprises a suspended span pipe 1, a universal hinge 3 and an end deflector 4. The suspension pipe 1 is arranged in parallel to the bottom wall of the water tank 21, one end of the suspension pipe 1 is connected with a universal hinge 3 fixed on the end guide plate 4 to realize hinge constraint, and the other end of the suspension pipe passes through the other end guide plate 4 to be connected with a traction steel wire 6. End baffles 4 are arranged at both ends of the suspension pipe 1 to eliminate the end effect of the circumfluence.
As shown in fig. 1 and 3, the rotary support module is composed of a support upright 9, a rotary disk 10, a goniometer dial 11 and a sliding truss 12. The sliding truss 12 with omega-shaped rail grooves can slide on the end surface of the upper wall of the water tank 21 to provide support for the rotating disc 10 and the supporting upright 9. The rotating disc 10 is of two semicircular structures and is spliced and fixed through bolts, and an omega-shaped sliding rail groove is formed in the lower end face of the rotating disc 10. The supporting upright rods 9 are of I-shaped structures, the upper ends of the two vertical upright rods on two sides are provided with arc-shaped omega-shaped rails which can be embedded into 10 omega-shaped rail grooves of the rotating disc to freely rotate, the middle part of a middle cross beam of the supporting upright rods 9 is provided with a pointer, and the pointer penetrates through a dial 11 of the angle indicator to display the rotating angle; perpendicular pole setting in both sides of supporting pole setting 9 stretches into the aquatic and retrains the both ends of striding pipe 1 respectively to can adjust the clearance of flexible length in order to adjust the pipe 1 and the basin 21 bottom of striding according to the experimental scheme, the perpendicular pole setting surface of supporting pole setting 9 is carved with the scale in order to measure the clearance of striding pipe 1 and basin 21 bottom.
As shown in fig. 4, the tension testing module includes a pulley 5, a traction wire 6, a tension sensor 7, and a pre-tension setter 8. One end of a traction steel wire 6 is connected with one end of the span tube 1, then the traction steel wire 6 rounds a pulley 5 fixed at the bottom of a supporting upright rod 9 and is connected with a tension sensor 7, and the uppermost end of the traction steel wire 6 is connected with a pretension setting device 8. The pretension setting device 8 is fixed at the upper end of the supporting vertical rod 9, and the tension force can be preset for the suspended span pipe 1 by adjusting the pretension setting device 8. The horizontal traction force can be converted into the vertical traction force through the pulley 5 on the premise of not changing the tension force, and the tension sensor 7 connected to the traction steel wire 6 can monitor the axial tension force of the suspended span pipe 1 in real time and transmit data to the data acquisition terminal 20.
As shown in fig. 1, the flow field monitoring module is composed of an acoustic doppler velocimeter lifting rod 16, an acoustic doppler velocimeter 17, a laser emitter 18 and a particle imaging velocimetry camera 19. The acoustic Doppler velocimeter 17 is fixed on the acoustic Doppler velocimeter lifting rod 16, the acoustic Doppler velocimeter lifting rod 16 is fixed on the sliding truss 12, the acoustic Doppler velocimeter 17 is arranged on the upstream of the suspended span pipe 1 and used for measuring the velocity distribution of the upstream incoming flow of the suspended span pipe 1, and the acoustic Doppler velocimeter lifting rod 16 can stretch out and draw back to realize the height adjustment of the acoustic Doppler velocimeter 17 in the vertical direction. As shown in fig. 5, the laser emitter 18 is disposed below the water tank 21, and emits laser light to illuminate trace particles suspended across the flow field around the tube 1, so as to provide a flow field capture section for the particle imaging tacho camera 19. The lens of the particle imaging speed measuring camera 19 is arranged on one side of the water tank 21 opposite to the laser section, the particle imaging speed measuring camera 19 can capture flow field information of the laser section, and the collected flow field information is recorded through the data collecting terminal 20. The position of the laser transmitter 18 can be adjusted to capture the information of the streaming flow field of any section of the suspended span pipe 1 along the pipe axis direction.
As shown in fig. 1 and 6, the vibration slap monitoring module comprises an underwater high-speed camera lifting rod 13, an underwater high-speed camera 14, a bottom high-speed camera 15 and a transparent pressure-sensitive film 2. The upper end of the underwater high-speed camera lifting rod 13 is fixed on the sliding truss 12 and can move along the flow direction along with the sliding truss 12. The underwater high-speed camera lifting rod 13 can stretch out and draw back, and the underwater high-speed camera 14 is fixed at the lower end of the underwater high-speed camera lifting rod 13, is arranged at the downstream of the suspended span pipe 1 and is used for synchronously monitoring the transverse vibration of the suspended span pipe 1 and recording the process of slapping the bottom wall of the water tank 21. The length of the lifting rod 13 of the underwater high-speed camera is adjusted to enable the suspended span pipe 1 to be positioned in the middle of a picture captured by a lens of the underwater high-speed camera 14, and then the distance between the sliding truss 12 and the suspended span pipe 1 is adjusted to enable the underwater high-speed camera 14 to capture all monitoring points of the suspended span pipe 1 and not to interfere with a wake flow field of the suspended span pipe 1. The bottom high-speed camera 15 is arranged right below the suspended span pipe 1 and used for monitoring the flow direction vibration displacement of the suspended span pipe 1. The transparent pressure-sensitive film 2 is attached to the bottom wall of the transparent glass of the water tank 21 at the lower side of the suspended span tube 1 so as to monitor the acting force of the suspended span tube 1 on slapping the bottom wall of the water tank 21 and the corresponding slapping position in real time. Monitoring data of the underwater high-speed camera 14, the bottom high-speed camera 15 and the transparent pressure-sensitive film 2 are recorded through the data acquisition terminal 20.
An experimental method for simulating the vibration slapping coupling response of the submarine suspended span pipe 1 is provided by utilizing an experimental device for simulating the vibration slapping coupling response of the submarine suspended span pipe 1. The water tank 21 gate is opened to supply water, the upstream incoming flow velocity is measured through the acoustic Doppler velocimeter 17, and vortex-induced vibration is generated in the suspended span pipe 1 close to the bottom wall of the water tank 21 under the action of water flow impact. The transverse vibration displacement and the position and the form of the bottom of the water tank 21 flapped by the suspended pipe 1 are synchronously monitored by the underwater high-speed camera 14, the flow direction vibration displacement is monitored by the bottom high-speed camera 15, and the acting force of the suspended pipe 1 to flap the bottom wall of the water tank 21 and the corresponding flapping position are monitored in real time by the transparent pressure-sensitive film 2. The relative position of the laser transmitter 18 is changed along the axial direction of the suspended span tube 1, and the information of the streaming flow field of the suspended span tube 1 flowing to the section at different positions of the tube shaft is captured by the particle imaging speed measuring camera 19. Then, the flow velocity data, the displacement data, the tension data, the slapping force data and the flow field information obtained by the data acquisition terminal 20 are processed, and the vortex excitation dynamic response and the pipe bed slapping coupling action rule of the suspended span pipe 1 are obtained through analysis. The incoming flow velocity of the water tank 21 is kept unchanged, the pre-tension force is preset for the suspension cross pipe 1 through the pre-tension setting device 8, the telescopic length of the vertical rods on the two sides of the supporting vertical rod 9 is adjusted, and the gap between the suspension cross pipe 1 and the bottom wall is changed, so that the influence of the test gap on the vibration response rule of the suspension cross pipe 1 and the pipe bed slapping coupling action rule is tested. The incoming flow velocity and the gap height are kept unchanged, the initial tension of the suspended span pipe 1 is changed by adjusting the pre-tension setter 8, and the influence of the pre-tension on the vibration response of the suspended span pipe 1 and the pipe bed slapping coupling effect and the change rule of the axial tension of the suspended span pipe 1 during vortex-induced vibration are tested and analyzed. The influence of an incident flow attack angle on the vibration and the slapping of the suspended span pipe 1 and the applicability of a normal flow velocity criterion when collision occurs are tested and analyzed by adjusting the rotating angle of the supporting vertical rod 9 in the rotating disc 10.
Example (b):
when the device is installed, firstly, the suspension pipe 1 is installed and arranged on the supporting vertical rod 9, the suspension pipe 1 is fixed in the water tank 21 through the rotating disc 10 and the sliding truss 12, the telescopic length of the supporting vertical rod 9 is adjusted to adjust the gap between the suspension pipe 1 and the bottom of the water tank 21, and then the suspension pipe 1 is preset with proper tension through the adjusting pretension setter 8. Then, an acoustic doppler velocimeter 17 is arranged upstream of the suspended span tube 1 to measure the incoming flow velocity. Secondly, an underwater high-speed camera 14 and a bottom high-speed camera 15 are respectively arranged at the downstream of the suspended span pipe 1 and right below the wall of the bottom water tank 21, and a laser emitter 18 and a particle imaging speed measuring camera 19 are respectively arranged at the lower part of the wall of the bottom water tank 21 of the suspended span pipe 1 and one side of the water tank 21. The transparent pressure-sensitive film 2 is arranged on the inner wall of the water tank 21 right below the span tube 1, and the acoustic Doppler velocimeter 17, the transparent pressure-sensitive film 2, the tension sensor 7, the underwater high-speed camera, the bottom high-speed camera 15, the laser emitter 18 and the particle imaging speed-measuring camera 19 are connected with the data acquisition terminal 20. And opening a gate of the water tank 21 for water supply after the installation is finished, respectively adjusting the rotation angle, the gap and the pretension, recording the flow velocity, the displacement, the tension, the flapping force and the flow field data, and analyzing the vibration response rule of the suspended span pipe 1 and the flapping coupling rule of the pipe bed.
Claims (2)
1. An experimental device for simulating vibration slapping coupling response of a submarine suspended span pipe comprises a suspended span pipe module, a rotary support module, a tension force testing module, a flow field monitoring module, a vibration slapping monitoring module and a data acquisition terminal (20), wherein a device main body except the data acquisition terminal (20) is arranged in an experimental water tank (21); the suspension pipe module comprises a suspension pipe (1), universal hinges (3) and end guide plates (4), the suspension pipe (1) is arranged in parallel to the bottom wall of the water tank (21), one end of the suspension pipe (1) is connected with the universal hinges (3) fixed on the end guide plates (4) to achieve hinge constraint, the other end of the suspension pipe penetrates through the other end guide plate (4) to be connected with a traction steel wire (6), and the end guide plates (4) are arranged at the two ends of the suspension pipe (1) to eliminate the end effect of streaming; the rotary supporting module consists of a supporting upright rod (9), a rotating disc (10), a corner instrument dial (11) and a sliding truss (12), the sliding truss (12) with an omega-shaped rail groove can slide on the end surface of the upper wall of the water tank (21),supports are provided for the rotating disc (10) and the supporting upright rod (9); the rotating disc (10) is of two semicircular structures and is spliced and fixed through bolts, and an omega-shaped sliding rail groove is formed in the lower end face of the rotating disc (10); the supporting upright rods (9) are of I-shaped structures, the upper ends of the two vertical upright rods on two sides are provided with arc-shaped omega-shaped rails which can be embedded into omega-shaped rail grooves of the rotating disc (10) to rotate freely, the middle part of a middle cross beam of the supporting upright rods (9) is provided with a pointer, and the pointer penetrates through a dial plate (11) of the angle indicator to display the rotating angle; the vertical upright posts on the two sides of the supporting upright post (9) extend into water to respectively constrain the two ends of the suspended span pipe (1), the telescopic length can be adjusted according to an experimental scheme to adjust the gap between the suspended span pipe (1) and the bottom of the water tank (21), and a scale is engraved on the surface of the vertical upright post of the supporting upright post (9) to measure the gap between the suspended span pipe (1) and the bottom of the water tank (21); the tension testing module comprises a pulley (5), a traction steel wire (6), a tension sensor (7) and a pre-tension setter (8); the traction force in the horizontal direction can be converted into the tension force in the vertical direction through the pulley (5) on the premise of not changing the tension force, and the tension sensor (7) connected to the traction steel wire (6) can monitor the axial tension force of the span tube (1) in real time and transmit data to the data acquisition terminal (20); the flow field monitoring module consists of an acoustic Doppler velocimeter lifting rod (16), an acoustic Doppler velocimeter (17), a laser transmitter (18) and a particle imaging velocimetry camera (19); the acoustic Doppler velocimeter is characterized in that an acoustic Doppler velocimeter (17) is fixed on an acoustic Doppler velocimeter lifting rod (16), the acoustic Doppler velocimeter lifting rod (16) is fixed on a sliding truss (12), the acoustic Doppler velocimeter (17) is arranged on the upstream of a suspended span pipe (1) and used for measuring the velocity distribution of incoming flow on the upstream of the suspended span pipe (1), and the acoustic Doppler velocimeter lifting rod (16) can stretch out and draw back to realize height adjustment of the acoustic Doppler velocimeter (17) in the vertical direction; the laser emitter (18) is arranged below the water tank (21), and the emitted laser lights tracing particles of a flow field around the suspension cross pipe (1) to provide a flow field capturing section for the particle imaging speed measuring camera (19); the lens of the particle imaging speed measurement camera (19) is over against the laser section and is arranged on one side of the water tank (21), the particle imaging speed measurement camera (19) can capture flow field information of the laser section, and the collected flow field information is recorded through a data acquisition terminal (20); by adjusting the laser emitter(18) The position of the suspension pipe (1) can capture the information of the streaming flow field of any section of the suspension pipe (1) along the direction of the pipe shaft; the vibration slapping monitoring module comprises an underwater high-speed camera lifting rod (13), an underwater high-speed camera (14), a bottom high-speed camera (15) and a transparent pressure-sensitive film (2); the upper end of an underwater high-speed camera lifting rod (13) is fixed on the sliding truss (12) and can move along the flow direction along with the sliding truss (12); the underwater high-speed camera lifting rod (13) can be stretched, and the underwater high-speed camera (14) is fixed on the underwater high-speed camera lifting rod (13)1The lower end of (a); the bottom high-speed camera (15) is arranged right below the suspended span pipe (1) and used for monitoring the flow direction vibration displacement of the suspended span pipe (1); monitoring data of the underwater high-speed camera (14), the bottom high-speed camera (15) and the transparent pressure-sensitive film (2) are recorded through a data acquisition terminal (20); the method is characterized in that: one end of the traction steel wire (6) is connected with one end of the suspension spanning pipe (1), then the traction steel wire (6) rounds a pulley (5) fixed at the bottom of the supporting upright rod (9) and is connected with the tension sensor (7), and the uppermost end of the traction steel wire (6) is connected with the pre-tension setter (8); the pretension setter (8) is fixed at the upper end of the supporting vertical rod (9), and the pretension setter (8) can be adjusted to preset tension for the suspended span pipe (1); the underwater high-speed camera (14) is arranged at the downstream of the suspended span pipe (1) and is used for synchronously monitoring the transverse vibration of the suspended span pipe (1) and recording the process of slapping the bottom wall of the water tank (21); the length of an underwater high-speed camera lifting rod (13) is adjusted to enable the suspension pipe (1) to be located in the middle of a shot capturing picture of an underwater high-speed camera (14), and then the distance between the sliding truss (12) and the suspension pipe (1) is adjusted to enable the underwater high-speed camera (14) to capture all monitoring points of the suspension pipe (1) and not to interfere with a wake flow field of the suspension pipe (1); the transparent pressure-sensitive film (2) is attached to the transparent glass bottom wall of the water tank (21) at the lower side of the suspended span tube (1) so as to monitor the acting force of the suspended span tube (1) on slapping the bottom wall of the water tank (21) and the corresponding slapping position in real time.
2. An experimental method for simulating a vibration slapping coupling response of a submarine suspended span pipe (1) is characterized in that the experimental device for simulating the vibration slapping coupling response of the submarine suspended span pipe (1) according to claim 1 is adopted, a gate of a water tank (21) is opened to supply water, an upstream incoming flow velocity is measured through an acoustic Doppler velocimeter (17), and vortex-induced vibration is generated in the suspended span pipe (1) arranged near the bottom wall of the water tank (21) under the action of water flow impact; the method is characterized in that: synchronously monitoring transverse vibration displacement and the position and the form of the bottom of a water tank (21) slapped by a suspended span pipe (1) through an underwater high-speed camera (14), monitoring flow direction vibration displacement by a bottom high-speed camera (15), and monitoring the acting force of the suspended span pipe (1) slapping the bottom wall of the water tank (21) and the corresponding slapping position in real time by a transparent pressure-sensitive film (2); the relative position of a laser transmitter (18) is changed along the axial direction of the suspended span tube (1), and the information of the streaming flow field of the suspended span tube (1) flowing to the cross section at different positions of the tube shaft is captured by a particle imaging speed measuring camera (19); then, processing flow velocity data, displacement data, tension data, flapping force data and flow field information obtained by the data acquisition terminal (20), and analyzing to obtain a vortex excitation dynamic response and a tube bed flapping coupling action rule of the suspended cross tube (1); keeping the incoming flow velocity of the water tank (21) unchanged, presetting tension for the suspended span pipe (1) through a pre-tension setter (8), and adjusting the telescopic length of the vertical upright rods on the two sides of the supporting upright rod (9) to change the gap between the suspended span pipe (1) and the bottom wall, so as to test the influence of the gap on the vibration response rule of the suspended span pipe (1) and the pipe bed slapping coupling rule; keeping the flow velocity of incoming flow and the height of a gap unchanged, changing the initial tension of the suspended span pipe (1) by adjusting the pre-tension setter (8), and testing and analyzing the influence of the pre-tension on the vibration response of the suspended span pipe (1) and the slapping coupling effect of a pipe bed and the change rule of the axial tension of the suspended span pipe (1) during vortex-induced vibration; the influence of an incident flow attack angle on the vibration and the slapping of the suspended span pipe (1) and the applicability of a normal flow velocity criterion when the slapping occurs are tested and analyzed by adjusting the rotating angle of the supporting vertical rod (9) in the rotating disc (10).
Priority Applications (1)
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