CN110455479B - Microstructure-damped cylinder vortex-induced vibration experimental device and simulation method - Google Patents
Microstructure-damped cylinder vortex-induced vibration experimental device and simulation method Download PDFInfo
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- CN110455479B CN110455479B CN201910725165.8A CN201910725165A CN110455479B CN 110455479 B CN110455479 B CN 110455479B CN 201910725165 A CN201910725165 A CN 201910725165A CN 110455479 B CN110455479 B CN 110455479B
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Abstract
The embodiment of the invention relates to a microstructure damped cylinder vortex-induced vibration experimental device and a simulation method, wherein the device comprises: the device comprises a large-scale wave water channel module, a hoistable supporting module, an air floating platform module, a cylinder structure module, a spring module, an air channel module and a measuring module. The device can study the cylinder structure vortex-induced vibration triggering and amplitude-frequency response characteristics, especially the problems of cylinder vortex-induced vibration close to the bed surface, the coupling effect of submarine pipeline vortex-induced vibration and seabed scouring and the like, and can provide scientific basis for engineers to design and lay submarine pipelines.
Description
Technical Field
The embodiment of the invention relates to the technical field of offshore engineering and submarine pipeline engineering, in particular to a microstructure damped cylinder vortex-induced vibration experimental device and a microstructure damped cylinder vortex-induced vibration simulation method.
Background
Submarine pipelines are important components of an ocean oil and gas field exploitation system, are widely applied due to higher production benefits, and are known as life lines of ocean oil and gas fields. Different from onshore oil and gas transportation, the submarine pipeline is influenced by factors such as severe marine environmental load and complex submarine topography, and the safety of the submarine pipeline is always the focus of attention of people. Causes of damage to subsea pipelines typically include third party damage, scour hangings, corrosion, and the like. The submarine pipeline laid on the seabed often generates a suspended section below the pipeline due to unevenness, scouring and the like of the seabed, when fluid flows across the pipeline, alternately falling vortices are released on two sides of the pipeline, periodic pressure pulsation is induced on the surface of the pipeline to further induce vortex-induced vibration of the pipeline, so that fatigue cracks and even pipeline fracture occur at the stress concentration part of the pipeline, and the pipeline is the main cause of submarine pipeline fracture accidents. The method has important engineering and scientific significance for researching the mechanism of the scouring and vortex-induced vibration coupling action of the submarine pipeline in a laboratory.
The cylinder structure vortex-induced vibration experiment device is generally simplified into a mass-spring-damping system. The damping ratio has important influence on critical speed, amplitude-frequency response characteristic and excitation range triggered by the vortex-induced vibration of the cylinder structure. Flow direction vortex-induced vibration amplitude is one magnitude order less than transverse vortex-induced vibration amplitude, and experimental research usually only considers transverse vortex-induced vibration to limit displacement of the cylinder along the flow direction. The existing experimental device mostly adopts a plurality of groups of fixed pulleys and guide rails for guiding, and because friction, collision and blockage exist between the guide rails and the pulleys, the damping of the system is large and uncertainty exists.
Disclosure of Invention
In view of this, in order to solve technical problems in the prior art, embodiments of the present invention provide a microstructure damped cylinder vortex-induced vibration experimental apparatus and a simulation method.
In a first aspect, an embodiment of the present invention provides a microstructure damped cylinder vortex-induced vibration experimental apparatus, where the apparatus includes: the device comprises a large-scale wave water channel module, a hoistable support module, an air floatation platform module, a cylinder structure module, a spring module, an air channel module and a measurement module;
a cross beam is respectively and transversely arranged on the left and right opposite side walls of the large wave-current water tank module, the side walls of the large wave-current water tank module are made of transparent glass, and the bottom surface of the large wave-current water tank module is a concrete rigid wall surface;
the top of the hoistable support module is provided with a support frame consisting of four transverse sectional materials and two longitudinal sectional materials, and the bottom of the hoistable support module consists of two transverse sectional materials and two vertical sectional materials and is connected to the top of the support frame;
the air floatation platform module comprises a base plate, two air bearings, two shaft sleeves, two smooth round shaft guide rails, a fixed support, a connecting plate, two hanging rings and two mounting blocks, wherein the base plate is fixed at the bottom of the lifting support module;
the cylinder structure module comprises a cylinder, a balancing weight and a stainless steel rectangular linear guide rail connected with the cylinder, the balancing weight is placed in the main body, and the stainless steel rectangular linear guide rail is connected with the cylinder structure and is arranged on the mounting block;
the spring module comprises a lifting unit, a pair of lifting rings and a pair of springs, and the lifting unit is mounted at the top of the support frame; the lifting ring is arranged at the bottom of the lifting unit; one end of the spring is connected to one of the lifting rings, and the other end of the spring is connected to the other lifting ring;
the air path module comprises an air pump and an air supply pipeline, and the air supply pipeline is connected with the air pump and the air bearing;
the measuring module comprises a measuring terminal, a laser displacement sensor, a flow velocity meter, a PIV and a tension and pressure sensor, wherein the laser displacement sensor is arranged at the top of the support frame; the two flow velocity meters are respectively arranged on the upstream side and the downstream side of the column body; the pulling pressure sensor is arranged at the top of the connecting plate; the laser displacement sensor, the flow velocity meter and the pull pressure sensor are connected with a data acquisition card connected to the measuring terminal through data lines.
In one possible embodiment, the air bearing is supplied with air by the air pump, and the high-pressure air generated by the air pump forms an air film between the air bearing and the smooth circular shaft guide rail, so that friction and collision between the air bearing and the non-structural part of the smooth circular shaft guide rail are realized, and micro-structural damping is realized.
In one possible embodiment, a balancing weight is added in the column body, the mass ratio is adjusted, and the cross-sectional shape and the geometric dimension of the column body can be changed.
In one possible embodiment, the lifting unit moves up and down to adjust the distance between the column and the bottom wall surface of the large wave-current water tank module.
In a second aspect, an embodiment of the present invention provides a method for simulating a cylinder vortex-induced vibration experiment, where the method includes:
debugging the device in the air outside the wave flow water tank;
applying a plurality of known determined displacement values to the simulation pipeline, recording corresponding voltage values of the laser displacement sensor, and determining a calibration coefficient of the laser displacement sensor according to the displacement values and the voltage values;
determining the structural damping of the device;
placing the device in a wave-flow water tank, adding water into the wave-flow water tank to the experimental water depth, adjusting the distance between a pipeline and a bed surface, and measuring the natural frequency and the fluid damping of the device;
the wave and water flow are generated by utilizing the wave and water flow channel, wave parameters are changed or the flow speed is increased according to a preset rule according to a preset requirement, so that the cylinder structure generates vortex-induced vibration, and the structure response data, the flow speed, the flow field and the wave data are synchronously acquired by using the terminal.
In one possible embodiment, the determining structural damping of the device comprises:
releasing the column after applying known displacement excitation to enable the column to freely damp vibration;
recording the change of the vibration displacement of the column along with the time;
the theoretically predicted response is matched with the experimental record to find the unknown damping.
In one possible embodiment, the determining the natural frequency and the fluid damping of the device comprises:
releasing the column after applying known displacement excitation to the column so as to enable the column to freely damp vibration;
recording the change of the vibration displacement of the column along with the time;
matching the response predicted by theory with the experimental record to find out unknown damping;
ζ＝ln(Ai/Ai+n)/2πn，Aiand Ai+nAnd carrying out frequency spectrum analysis on the change of the vibration displacement of the column body along with the time to obtain the natural frequency for the displacement corresponding to the ith and i + n wave crests of the curve of the change of the free attenuation vibration displacement along with the time.
In a possible embodiment, the determining a calibration coefficient of the laser displacement sensor according to the displacement value and the voltage value includes:
and obtaining a calibration coefficient of the laser displacement sensor by fitting the displacement value and the voltage value.
In a possible implementation mode, all the data are synchronously measured through an autonomously developed fluid-solid-soil coupling multi-physical parameter synchronous test and real-time monitoring system, so that fluid-solid coupling analysis is facilitated.
In a possible implementation mode, the cylinder vortex-induced vibration under the multi-ocean environment can be researched by combining the wave current water tank, the cylinder vortex-induced vibration under the action of single ocean current can be researched, and the cylinder vortex-induced vibration under the combined action of wave current can also be researched.
The microstructure damped cylinder vortex-induced vibration experimental device and the simulation method provided by the embodiment of the invention can artificially apply damping to a cylinder, realize a controllable damped cylinder vortex-induced vibration simulation experiment, and can research the cylinder structure vortex-induced vibration triggering and amplitude-frequency response characteristics, particularly the problems of near-bed surface cylinder vortex-induced vibration, seabed pipeline vortex-induced vibration and seabed scouring coupling effect and the like, so that scientific basis can be provided for engineers to design and lay seabed pipelines.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present specification, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic structural diagram of a microstructure damped cylinder vortex-induced vibration experimental apparatus according to an embodiment of the present invention;
fig. 2 is a schematic implementation flow diagram of a simulation method for a cylinder vortex-induced vibration experiment according to an embodiment of the present invention;
fig. 3 is an effect diagram of a microstructure damped cylinder vortex-induced vibration experimental apparatus and a wave flow water tank according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained with reference to specific embodiments, which are not to be construed as limiting the embodiments of the present invention.
As shown in fig. 1, a schematic structural diagram of a microstructure damped cylinder vortex-induced vibration experimental apparatus provided in an embodiment of the present invention may include: the device comprises a large-scale wave water channel module, a hoistable supporting module, an air floating platform module, a cylinder structure module, a spring module, an air channel module and a measuring module.
For the large wave-current water tank module 1, a cross beam 11 is respectively and transversely arranged on the left and right opposite side walls of the large wave-current water tank module 1, the side walls of the large wave-current water tank module are made of transparent glass 12, and the bottom surface of the large wave-current water tank module is made of a concrete rigid wall surface 13.
The top of the hoistable support module 2 is provided with a support frame 21 consisting of four transverse sectional materials and two longitudinal sectional materials, and the bottom 22 of the hoistable support module 2 consists of two transverse sectional materials and two vertical sectional materials and is connected to the top of the support frame 21.
The air supporting platform module comprises a base plate 31, an air bearing 32, a shaft sleeve 33, smooth round shaft guide rails 34, fixed supports 35, a connecting plate 36, hanging rings 37 and an installation block 38, wherein the base plate 31 is fixed at the bottom 22 of the lifting support module 2, the height of the lifting support module can be adjusted as required, the air bearing 32 is sleeved on the smooth round shaft guide rails 34 and is fixed by the shaft sleeve 33, the two shaft sleeves 33 are connected together by the connecting plate 36, the fixed installation block 38 is arranged on the connecting plate, the two smooth round shaft guide rails 34 are installed on the base plate 31 of the air supporting platform by the four fixed supports 35, and the connecting plate 36 is provided with the two hanging rings 37.
Aiming at the column structure module 4, the device comprises a column 41, a balancing weight 42 and a stainless steel rectangular linear guide rail 43 connected with the column, wherein the column 41 can be changed into different geometric shapes and sizes as required, and the balancing weight 42 can be increased or decreased as required to adjust the mass ratio. The counterweight 42 is placed in the main body 41, and the stainless steel rectangular linear guide rail 43 is connected with a cylindrical structure and is installed on the installation block 38.
The spring module 5 includes a lifting unit 51, a pair of lifting rings 52, and a pair of springs 53. The lifting unit 51 is arranged at the top of the support frame 21 capable of lifting the support module 2, the whole motion system is lifted by a lifter to change the distance between the column body and the bed surface, and the lifting ring 52 is arranged at the bottom of the lifting unit 51; one end of the spring 53 is connected to the hanging rings 52, and the other end of the spring 53 is connected between the hanging rings 37, so that the whole motion system of the air bearing 32, the shaft sleeve 33, the connecting plate 36, the column 41, the counterweight 42 and the stainless steel rectangular linear guide rail 43 is elastically supported, and the rigidity of the spring can be adjusted as required.
The air path module 6 comprises an air pump 61 and an air supply line 62, wherein the air pump 61 is arranged outside the water tank 1, the air supply line 62 is used for supplying air to the air bearing 32, and high-pressure air forms an air film between the air bearing 32 and the smooth circular shaft guide rail 34, so that friction and collision between the air bearing and the guide rail non-structural parts are avoided. The resiliently supported cylinder structure modules 4 are thus free to move in the vertical direction.
The measuring module 7 comprises a measuring terminal 71, a laser displacement sensor 72, a flow meter, a PIV and a pull pressure sensor, wherein the measuring terminal 71 can be a measuring computer 71 and an acquisition device thereof.
The laser displacement sensor 72 is arranged on the upper part 21 of the hoistable support module 2 and is used for measuring the vertical vibration displacement of the pipeline; the tension pressure sensor is arranged on the upper part 21 of the hoistable support module 2, and is used for measuring the mass of the system and calibrating the rigidity of the spring; the two flow velocity meters are respectively arranged at the upstream side and the downstream side of the column body and used for measuring the far-field incoming flow velocity and the column body wake flow velocity; polishing the PIV from the lower part of the cylinder to the top, and measuring the circumfluence flow field of the cylinder; the wave height meter measures wave parameters upstream of the column; all the measurement data are connected with the measurement computer 71 through the independently developed fluid-solid-soil coupling multi-physical-parameter synchronous test and real-time monitoring system for synchronous measurement, so that fluid-solid coupling analysis is facilitated.
As shown in fig. 2, an implementation flow diagram of a simulation method for a cylinder vortex-induced vibration experiment provided in an embodiment of the present invention is shown, and the method specifically includes the following steps:
s201, debugging the device in the air outside the wave flow water tank;
s202, applying a plurality of known determined displacement values to the simulation pipeline, recording corresponding voltage values of the laser displacement sensor, and determining a calibration coefficient of the laser displacement sensor according to the displacement values and the voltage values;
applying a plurality of known determined displacement values to the simulation pipeline, recording corresponding voltage values of the laser displacement sensor, and obtaining a calibration coefficient of the laser displacement sensor by fitting the displacement values and the voltage values.
S203, measuring the structural damping of the device;
determining structural damping of a device comprising: releasing the column after applying known displacement excitation to enable the column to freely damp vibration; recording the change of the vibration displacement of the column along with the time; the theoretically predicted response is matched with the experimental record to find the unknown damping.
S204, placing the device in a wave-flow water tank, adding water into the wave-flow water tank to the experimental water depth, adjusting the distance between a pipeline and a bed surface, and measuring the natural frequency and the fluid damping of the device;
the device is hoisted to the wave-entering launder experiment section, water is added into the launder to the experiment water depth, and the distance between the pipeline and the bed surface is adjusted. Determining the natural frequency and fluid damping of a device comprising:
releasing the column after applying known displacement excitation to the column so as to enable the column to freely damp vibration;
recording the change of the vibration displacement of the column along with the time;
matching the response predicted by theory with the experimental record to find out unknown damping;
ζ＝ln(Ai/Ai+n)/2πn，Aiand Ai+nCorresponding to the ith and i + n wave peaks of the curve of the free damping vibration displacement along the timeAnd (3) carrying out frequency spectrum analysis on the change of the vibration displacement of the column along with time to obtain the natural frequency. Damping here includes both structural damping and fluid damping.
S205, generating waves and water flow by using the wave flow water tank, changing wave parameters or increasing flow speed according to a preset rule according to a preset requirement to enable the cylinder structure to generate vortex-induced vibration, and synchronously acquiring structure response data, flow speed, flow field and wave data by using a terminal.
And opening the wave making system and the flow making system of the wave water channel, changing wave parameters or uniformly and slowly increasing the flow velocity according to the experimental requirements to enable the cylinder structure to generate vortex-induced vibration, and synchronously acquiring structural response data, the flow velocity, the flow field and wave parameter data by using a computer.
To illustrate the simulation method of the cylinder vortex-induced vibration experiment provided by the embodiment of the present invention, as shown in fig. 3, the following embodiments are provided:
examples 1,
1. Debugging the device in the air outside the wave flow water tank;
2. applying a plurality of known definite displacement values to the simulation pipeline, recording corresponding voltage values of the laser displacement sensor, and obtaining a calibration coefficient of the laser displacement sensor by fitting the displacement and the corresponding voltage values;
3. the structural damping of the device was determined, which basically operated as follows: a. releasing the column body after applying known displacement excitation to make the column body freely vibrate in an attenuation mode; b. recording the change of the vibration displacement of the column along with the time; c. matching the response predicted by theory with the experimental record to find out unknown damping;
4. the device is hoisted to the wave-entering launder experiment section, water is added into the launder to the experiment water depth, and the distance between the pipeline and the bed surface is adjusted. Determining the natural frequency and fluid damping of the device, comprising the steps of: a. releasing the column body after applying known displacement excitation to make the column body freely vibrate in an attenuation mode; b. recording the change of the vibration displacement of the column along with the time; c. the theoretically predicted response is matched with the experimental record to find the unknown damping. ζ ═ ln (a)i/Ai+n)/2πn，AiAnd Ai+nThe displacement corresponding to the ith and i + n wave crests of the curve of the variation of the free damping vibration displacement along the time is obtained. Damping here includes both structural damping and fluid damping. Carrying out frequency spectrum analysis on the change of the vibration displacement of the column along with the time to obtain the natural frequency;
5. and opening the wave flow water channel flow making system, uniformly and slowly increasing the flow velocity according to the experimental requirements, generating vortex-induced vibration on the cylinder structure, and synchronously acquiring structural response data, the flow velocity and the flow field data by using a computer.
Examples 2,
1. Debugging the device in the air outside the wave flow water tank;
2. applying a plurality of known definite displacement values to the simulation pipeline, recording corresponding voltage values of the laser displacement sensor, and obtaining a calibration coefficient of the laser displacement sensor by fitting the displacement and the corresponding voltage values;
3. the structural damping of the device was determined, which basically operated as follows: a. releasing the column body after applying known displacement excitation to make the column body freely vibrate in an attenuation mode; b. recording the change of the vibration displacement of the column along with the time; c. matching the response predicted by theory with the experimental record to find out unknown damping;
4. the device is hoisted to the wave-entering launder experiment section, water is added into the launder to the experiment water depth, and the distance between the pipeline and the bed surface is adjusted. Determining the natural frequency and fluid damping of the device, comprising the steps of: a. releasing the column body after applying known displacement excitation to make the column body freely vibrate in an attenuation mode; b. recording the change of the vibration displacement of the column along with the time; c. the theoretically predicted response is matched with the experimental record to find the unknown damping. ζ ═ ln (a)i/Ai+n)/2πn，AiAnd Ai+nThe displacement corresponding to the ith and i + n wave crests of the curve of the variation of the free damping vibration displacement along the time is obtained. Damping here includes both structural damping and fluid damping. Carrying out frequency spectrum analysis on the change of the vibration displacement of the column along with the time to obtain the natural frequency;
5. opening a wave flow water tank wave making system and a flow making system, setting wave parameters according to experimental requirements, then uniformly and slowly increasing the flow velocity to enable the cylinder structure to generate vortex-induced vibration, and synchronously acquiring structural response data and flow velocity, flow field and wave parameter data by using a computer.
Through the above description of the microstructure damped cylinder vortex-induced vibration experimental device and the simulation method provided by the embodiment of the invention, the following beneficial effects are achieved:
1. the whole device has strong assembly, can be assembled and debugged outside the water tank, can conveniently hoist the water tank for experiment after debugging is finished, and does not need repeated disassembly and assembly for other experiments subsequently;
2. the cylinder body can freely move in the vertical direction, and subsequently the controllable adjustment of the damping can be realized;
3. the lifting device of the device can conveniently adjust the distance between the column body and the bed surface and study the near bed surface effect of vortex-induced vibration of the column body;
4. the cylinder system can conveniently change the section shape, the geometric dimension and the mass ratio of the cylinder, and can even research the vortex excitation dynamic response of a plurality of cylinders under different geometric dimensions and arrangement modes;
5. the cylinder vortex-induced vibration under the multi-ocean environment can be researched by combining the wave flow water tank, the cylinder vortex-induced vibration under the action of the single ocean current can be researched, and the cylinder vortex-induced vibration under the combined action of the wave flow can also be researched.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a cylinder vortex induced vibration experimental apparatus of micro-structure damping which characterized in that, the device includes: the device comprises a large-scale wave water channel module, a hoistable support module, an air floatation platform module, a cylinder structure module, a spring module, an air channel module and a measurement module;
a cross beam is respectively and transversely arranged on the left and right opposite side walls of the large wave-current water tank module, the side walls of the large wave-current water tank module are made of transparent glass, and the bottom surface of the large wave-current water tank module is a concrete rigid wall surface;
the top of the hoistable support module is provided with a support frame consisting of four transverse sectional materials and two longitudinal sectional materials, and the bottom of the hoistable support module consists of two transverse sectional materials and two vertical sectional materials and is connected to the top of the support frame;
the air floatation platform module comprises a base plate, two air bearings, two shaft sleeves, two smooth round shaft guide rails, a fixed support, a connecting plate, two hanging rings and two installation blocks, wherein the base plate is fixed at the bottom of the lifting support module;
the cylinder structure module comprises a cylinder, a balancing weight and a stainless steel rectangular linear guide rail connected with the cylinder, wherein the balancing weight is placed in the cylinder, the stainless steel rectangular linear guide rail is connected with the cylinder structure and is arranged on the mounting block, the balancing weight is added in the cylinder, the mass ratio is adjusted, and the interface shape and the geometric dimension of the cylinder can be changed;
the spring module comprises a lifting unit, a pair of lifting rings and a pair of springs, and the lifting unit is mounted at the top of the support frame; the lifting ring is arranged at the bottom of the lifting unit; one end of the spring is connected to one of the lifting rings, the other end of the spring is connected to the other lifting ring, and the lifting unit moves up and down to adjust the distance between the column and the wall surface of the bottom of the large wave flow water tank module;
the air path module comprises an air pump and an air supply pipeline, the air supply pipeline is connected with the air pump and the air bearing, the air bearing is supplied with air by the air pump, and high-pressure air generated by the air pump forms an air film between the air bearing and the smooth round shaft guide rail, so that friction and collision between the air bearing and the smooth round shaft guide rail without structural parts are realized, and micro-structure damping is realized;
the measuring module comprises a measuring terminal, a laser displacement sensor, a flow velocity meter, a PIV and a tension and pressure sensor, wherein the laser displacement sensor is arranged at the top of the support frame; the two flow velocity meters are respectively arranged on the upstream side and the downstream side of the column body; the pulling pressure sensor is arranged at the top of the connecting plate; the laser displacement sensor, the flow velocity meter and the pull pressure sensor are connected with a data acquisition card connected to the measuring terminal through data lines.
2. A method of simulating a column vortex induced vibration experiment according to the apparatus of claim 1, the method comprising:
debugging the device in the air outside the wave flow water tank;
applying a plurality of known determined displacement values to the simulation pipeline, recording corresponding voltage values of the laser displacement sensor, and determining a calibration coefficient of the laser displacement sensor according to the displacement values and the voltage values;
determining the structural damping of the device;
placing the device in a wave-flow water tank, adding water into the wave-flow water tank to the experimental water depth, adjusting the distance between a pipeline and a bed surface, and measuring the natural frequency and the fluid damping of the device;
the wave and water flow are generated by utilizing the wave and water flow channel, wave parameters are changed or the flow speed is increased according to a preset rule according to a preset requirement, so that the cylinder structure generates vortex-induced vibration, and the structure response data, the flow speed, the flow field and the wave data are synchronously acquired by using the terminal.
3. The method of claim 2, wherein determining structural damping of the device comprises:
releasing the column after applying known displacement excitation to enable the column to freely damp vibration;
recording the change of the vibration displacement of the column along with the time;
the theoretically predicted response is matched with the experimental record to find the unknown damping.
4. The method of claim 2, wherein determining the natural frequency and fluid damping of the device comprises:
releasing the column after applying known displacement excitation to the column so as to enable the column to freely damp vibration;
recording the change of the vibration displacement of the column along with the time;
matching the response predicted by theory with the experimental record to find out unknown damping;
ζ＝ln(Ai/Ai+n)/2πn，Aiand Ai+nI-th and i + n waves of time-dependent curve for free damping vibration displacementAnd (4) carrying out spectrum analysis on the vibration displacement of the column body along with the change of time by the displacement corresponding to the peak to obtain the natural frequency.
5. The method of claim 2, wherein determining calibration coefficients for the laser displacement sensor based on the displacement value and the voltage value comprises:
and obtaining a calibration coefficient of the laser displacement sensor by fitting the displacement value and the voltage value.
6. The method of claim 2, wherein the structural response data and the flow velocity, flow field and wave data are measured synchronously by a fluid-solid-soil coupling multi-physical parameter synchronous test and real-time monitoring system, so as to facilitate fluid-solid coupling analysis.
7. The method as claimed in claim 2, wherein, in combination with the wave current water tank, the cylinder vortex-induced vibration in multi-ocean environments can be studied, not only the cylinder vortex-induced vibration under the action of single ocean current, but also the cylinder vortex-induced vibration under the combined action of wave current.
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