CN106679791B - Submarine pipeline vortex-induced vibration simulator and experimental method - Google Patents
Submarine pipeline vortex-induced vibration simulator and experimental method Download PDFInfo
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Abstract
The invention discloses a kind of submarine pipeline vortex-induced vibration simulator and experimental method, which includes sink, the braced frame of rectangle, pipeline model movement mechanism and test macro；For support frame on sink, pipeline model movement mechanism includes rectangular simulation pipeline, two linear guides and the cross bar of group；Two linear guides respectively by guide rail slide block installation on the support frame, cross bar is connected on the upper beam of braced frame upper by two main springs；It is connect after each tester installs in test macro with control host.To the structure by installing the pipeline vortex-induced vibration simulation under control damping unit analog controllable damping additional.When being tested using the device, first instrument is demarcated, the damped coefficient of device measurement free oscillating system, the stiffness coefficient of spring is recycled, water is added to test.The device can be used to the problems such as triggering of system research vortex-induced vibration and amplitude, as a result can be used for reference by submerged pipeline engineering design.
Description
Technical field
The present invention relates to field of ocean engineering, more particularly to a kind of submarine pipeline vortex-induced vibration simulator and reality
Proved recipe method.
Background technique
Alternate vortex obscission can be formed in its rear when ocean current passes through hanging submarine pipeline in ocean engineering,
Generate periodical active force.Hanging submerged pipeline is equivalent to a spring-damper system, has specific frequency.Work as pipeline
Intrinsic frequency and fluid vortex shedding frequency it is close when, submarine pipeline will lead to spontaneous generation vortex-induced vibration, long term
The fatigue rupture of pipeline.
Vortex-induced vibration is a complicated fluid structurecoupling problem, and laboratory simulation is a kind of important research means.Usually
Experimental simulation device include pipeline model, groups of springs, sliding rail and structural framing etc., collectively constitute a spring-damper
Vibrational system.The critical speed, vibration amplitude and frequency that pipeline model vibrates are studied by changing water velocity in experiment
Rate etc..Damping is to influence a key factor of vortex-induced vibration characteristic, and damping mostlys come from inside configuration in model test
Frictional damping.Usual frictional damping changes with vibration amplitude, therefore the precise determination of damping is difficult to realize in experiment；It rubs simultaneously
Damping is difficult to eliminate again and change, this just largely limits the research influenced about damping for vortex-induced vibration.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of submarine pipeline vortex-induced vibration simulators and experiment side
Method, which simulates in laboratory sink proposes a kind of simulation of submarine pipeline vortex-induced vibration and measurement method, to system
The problems such as studying vortex-induced vibration triggering and amplitude, test result is accurate, can set the engineering that research achievement is applied to submerged pipeline
Meter.
For this purpose, technical scheme is as follows:
A kind of submarine pipeline vortex-induced vibration simulator, including sink, braced frame, pipeline model movement mechanism and test
System；
The braced frame by be erected on the sink along upper crossbeam, be vertically set on the crossbeam two it is perpendicular
Beam and the stull composition for being set to described two vertical beam lower parts；The braced frame is the crossbeam, two vertical beams and cross
Support the rectangular frame of the fixation constituted；
The pipeline model movement mechanism, including simulation pipeline, linear guide, guide rail slide block and cross bar；The guide rail is sliding
Block has four pieces, is respectively symmetrically fixed on described two vertical beams；There are two the linear guides, is installed respectively by guide rail slide block
On described two vertical beams, the linear guide can freely move up and down；The cross bar, simulation pipeline are separately positioned on described straight
The upper/lower terminal of line guide rail constitutes a rectangular configuration；The cross bar two sides are respectively arranged with main spring, by main spring or
Connecting rod is connected on the crossbeam；
The test macro includes control host, laser displacement sensor, pull pressure sensor and current meter；The tension and compression
There are two force snesors, is respectively arranged in linear guide and pipeline model intersection；The laser displacement sensor is mounted on institute
It states on crossbeam；The current meter is mounted on simulation pipeline side；The laser displacement sensor, pull pressure sensor and current meter
It is connect respectively by data line with the control host.
The pipeline vortex-induced vibration under free damping is carried out using submarine pipeline vortex-induced vibration simulator as above to simulate, including
Following steps:
1) apply a downward displacement, the corresponding output voltage of recording laser displacement sensor to simulation pipeline, and lead to
Over-fitting obtains the calibration coefficient between displacement and voltage, imports calibration coefficient, demarcates to laser displacement sensor；
2) it measures the damped coefficient of free oscillating system: applying a downward displacement to simulation pipeline and then decontrol, enable
System carries out free vibration under only by gravity；Utilize the decaying of laser displacement sensor record free vibration amplitude
Journey, according to formula ζ=ln (Ai/Ai+n2 π n of)/() calculate damped coefficient, wherein AiAnd Ai+nRepresent i-th and i+n free vibration
Amplitude；
Measure the stiffness coefficient of main spring: applying an external force to main spring makes its elongation, is remembered using pull pressure sensor
Applied external force is recorded, using the length of laser displacement sensor measurement main spring elongation, then according to formula K1=F1/X1Meter
The stiffness coefficient of main spring is calculated, wherein K1For the stiffness coefficient of main spring, X1For the length of main spring elongation, F1Applied
Pulling force；
3) water is added into sink to water level is tested, 10 times for about simulating pipe diameter；Start to test, be set using sink end
Water body flow in the water pump driving sink set, increases water velocity at the uniform velocity, until vortex-induced vibration occurs for pipeline.
Further, an additional springs are additionally provided in the middle part of the cross bar；Lead screw pair is installed on the upside of the additional springs, institute
It states lead screw pair and is connected with the servo motor for being equipped with retarder；The servo motor is connected with the control host；The control
Host processed can control the revolving speed of the servo motor, and then adjust the length of the lead screw pair, so as to adjust the additional springs
Length.It is preferred that the feed screw nut of the lead screw pair is fixed on retarder side, lead screw lower end directly or after connection bearing with
Additional springs connection.
The pipeline vortex-induced vibration under controllable damping is carried out using submarine pipeline vortex-induced vibration simulator as described above to simulate,
Include the following steps:
1) apply a downward displacement, the corresponding output voltage of recording laser displacement sensor to simulation pipeline, and lead to
Over-fitting obtains the calibration coefficient between displacement and voltage, imports calibration coefficient, demarcates to laser displacement sensor；
2) it measures the damped coefficient of free oscillating system: applying a downward displacement to simulation pipeline and then decontrol, enable
System carries out free vibration under only by gravity；Utilize the decaying of laser displacement sensor record free vibration amplitude
Journey, according to formula ζ=ln (Ai/Ai+n2 π n of)/() calculate damped coefficient, wherein AiAnd Ai+nRepresent i-th and i+n free vibration
Amplitude；
Measure the stiffness coefficient of main spring: applying an external force to main spring makes its elongation, is remembered using pull pressure sensor
Applied external force is recorded, using the length of laser displacement sensor measurement main spring elongation, then according to formula K1=F1/X1Meter
The stiffness coefficient of main spring is calculated, wherein K1For the stiffness coefficient of main spring, X1For the length of main spring elongation, F1Applied
Pulling force；
3) test the stiffness coefficient of additional springs: applying an external force to additional springs makes its elongation, utilizes laser displacement
The length of its elongation of sensor measurement, the size for applying external force is measured using pull pressure sensor, according to formula K2=F2/X2Meter
The stiffness coefficient of additional springs is calculated, wherein K2For the stiffness coefficient of additional springs, X2For the length of additional springs elongation, F2For institute
The external force of application；
4) the experiment depth of water is added water into sink；The damped motion opened in control host controls program, in control program
The stiffness coefficient K of middle input additional springs2And expected additional damping C1；Program is controlled then according to formula X=C1/K2It calculates
The moving displacement X of lead screw pair is controlled, control program issues corresponding control signal to servo motor, then turns by retarder
It changes, becomes the moving displacement X of lead screw pair, so that the elongation and shortening of additional springs are controlled, to play the effect of additional movement damping
Fruit.
Further, the main spring is replaced by rigid link, removes the additional springs, and the lead screw pair is directly connected
It connects and is connected in the retarder with cross bar.Submarine pipeline forced vibration mould is carried out using the submarine pipeline vortex-induced vibration simulator
It is quasi-, include the following steps:
1) to simulation pipeline 51 apply a downward displacement, the corresponding output voltage of recording laser displacement sensor, and
By being fitted the calibration coefficient obtained between displacement and voltage, calibration coefficient is imported, laser displacement sensor is demarcated；
2) the experiment depth of water is added water into sink；Under hydrostatic or fixed water velocity, watched by the way that control host 1 is given
81 1 fixed sinusoidal signals of motor are taken, to control the vibration amplitude and frequency of the lead screw pair output, in the work of lead screw pair
It is moved with lower pipeline model sport mechanism 5.
Submarine pipeline vortex-induced vibration simulator provided by the invention and experimental method have a characteristic that
(1) adjustable system damping
The damping in laboratory in the simulation of pipeline vortex-induced vibration is both difficult to measure, also not mainly from structural damping at present
It can eliminate, therefore great influence is brought to accurate research vortex-induced vibration characteristic.The present invention uses active control technology, real-time measurement
Structural vibration is displaced and feeds back to control host, by obtaining the real-time speed of model sport to displacement derivation, while analyzing
To real-time system damping.Due to damping force be it is proportional with speed, by control host give servo motor pass
Defeated corresponding signal, changes the length of additional springs, and it is additional to generate to apply a spring force directly proportional to speed to structure
Damping force, to realize the change of system total damping.This method can both increase damping, can also eliminate damping, even in fact
Existing negative damping.
(2) closed-loop control systems are used
By the concept of automatic control and theoretical origin in the design of device.By laser displacement sensor, data cable,
Data collecting card, control program, AC servo motor, retarder, connecting rod, additional springs, pipeline model and laser displacement sensing
A close loop control circuit is formed between device.AC servo driver has integrated EMC filter, and motor shaft end is with coding
Device, motor inside are equipped with position, speed and current feedback.Servo-system passes through integrative display terminal using local control model
Drive parameter is set and provides driving signal for AC servo motor.It can be accurately controlled and be issued based on ISA/PCI bus
Pulse frequency (motor speed), pulse number (motor corner) and frequency change rate (motor acceleration), can satisfy total
The various complex controls requirement of word servo motor.This control program realizes accurate timing using split-second precision function, can be improved
The control precision of additional movement damping.
(3) more physical parameter synchro measures such as vibration displacement, stress and flow velocity
Vortex-induced vibration is a complicated coupling effect between fluid and structure, is related to displacement structure, stress and water flow
The association of multiple physical parameters such as speed.Traditional measurement method usually to parameters independent measurement, is then handled, this
Sample is difficult to analyze the interactive quantitative effect of each physical factor, and obtains the objective law reflected engineering in practice and each pass
Quantitative relationship between key parameter, especially for the fluid structurecoupling problem that vortex-induced vibration is complicated in this way.The synchronized measurement system
Hardware foundation be NI company USB-6255 high-speed synchronous data acquiring card, can be with the analog signal in 64 channels of synchronous acquisition
And can produce the digital output signal in 8 channels, laser displacement sensor, pull pressure sensor and ADV stream can be acquired simultaneously
The data-signal of fast instrument.Calibration curve using each sensor changes signal, is changed into physical parametric data, institute
Some supplemental characteristics are stored in same file, realize synchronism detection and the analysis of more physical parameters.
(4) multipurpose and scalability of apparatus function
Vortex-induced vibration is the movement of a kind of effect due to fluid and spontaneous generation, and the present apparatus can in addition to damping may be implemented
Except the vortex-induced vibration of control, model realization forced movement can also be directly driven using servo motor.It can be with by forced movement
It was found that some fundamental characteristics and rule in flow field.At this point, groups of springs is removed, connecting rod is directly connected to pipeline model fitness machine
Structure changes the period of motion and amplitude, by adjusting the revolving speed of motor to realize the forced movement of pipeline model.
In addition, more physical parameter synchronized measurement systems provide open data acquisition scheme, i.e., different are ground
Study carefully project, arbitrarily can add and delete as needed acquisition channel, that is, increase the type and quantity of sensor, is at data post
Reason provides a great convenience.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of submarine pipeline vortex-induced vibration simulator provided by the invention.
Specific embodiment
Technical solution of the present invention is described in detail below in conjunction with drawings and examples.
Embodiment 1
As shown in Figure 1, a kind of submarine pipeline vortex-induced vibration simulator, including sink, braced frame 6, pipeline model fortune
Motivation structure 5 and test macro；
The braced frame 6 is by being erected on the sink along upper crossbeam 61, being vertically set on the crossbeam 61
Two vertical beams 62 and the stull 63 for being set to described two 62 lower parts of vertical beam form；The braced frame 6 is the crossbeam
61, the rectangular frame for the fixation that two vertical beams 62 and stull 63 are constituted；(63, two vertical beams 62 of stull are all set in sink
Portion)
The pipeline model movement mechanism, including simulation pipeline 51, linear guide 52, guide rail slide block 53 and cross bar 54；Institute
Stating guide rail slide block 53 has four pieces, is respectively symmetrically fixed on described two vertical beams 62；There are two the linear guides 52, leads to respectively
It crosses guide rail slide block 53 to be mounted on described two vertical beams 62, the linear guide 52 can freely move up and down；The cross bar 54, mould
Quasi- pipeline 51 is separately positioned on the upper/lower terminal of the linear guide 52, constitutes a rectangular configuration；54 two sides of cross bar point
It is not provided with main spring 55, is connected on the crossbeam 61 by main spring 55 or connecting rod；
The test macro includes control host 1, laser displacement sensor 7, pull pressure sensor 4 and current meter；It is described
There are two pull pressure sensor 4, is respectively arranged in linear guide 52 and 51 intersection of pipeline model；The laser displacement sensor
7 are mounted on the crossbeam 61；The current meter is mounted on simulation 51 side of pipeline；The laser displacement sensor 7, pressure
Sensor 4 and current meter pass through data line respectively and connect with the control host 1.
The device can be used for the simulation re-test of the pipeline vortex-induced vibration under free damping, and steps are as follows:
1) to simulation pipeline 51 apply a downward displacement, the corresponding output voltage of recording laser displacement sensor 7, and
By being fitted the calibration coefficient obtained between displacement and voltage, calibration coefficient is imported, laser displacement sensor 7 is demarcated；
2) it measures the damped coefficient of free oscillating system: applying a downward displacement to simulation pipeline 51 and then decontrol,
System is enabled to carry out free vibration under only by gravity；The decaying of free vibration amplitude is recorded using laser displacement sensor 7
Process, according to formula ζ=ln (Ai/Ai+n2 π n of)/() calculate damped coefficient, wherein AiAnd Ai+nRepresent i-th and i+n free vibration
Amplitude；
Next be measured to the stiffness coefficient of main spring 55: applying an external force to main spring 55 makes its elongation, benefit
Applied external force is recorded with pull pressure sensor 4, measures the length that main spring 55 extends using laser displacement sensor 7, so
Afterwards according to formula K1=F1/X1The stiffness coefficient of main spring 55 is calculated, wherein K1For the stiffness coefficient of main spring 55, X1For main spring
The length of elongation, F1For the pulling force applied；
3) water is added into sink to water level is tested, 10 times for about simulating 51 diameter of pipeline.Start to test, utilizes sink end
Water body flow in the water pump driving sink of setting, increases water velocity at the uniform velocity, until vortex-induced vibration occurs for pipeline；
4) using during current meter measurement experiment water velocity, utilize laser displacement sensor to measure pipe vibration position
It moves, measure pipeline stress using pull pressure sensor；By to water velocity, three data of vibration displacement and pipeline stress it is same
Step analysis to judge the severe degree of pipeline vortex-induced vibration, and finally predicts a possibility that fatigue rupture occurs for pipeline.
Embodiment 2
In order to carry out the simulation of the pipeline vortex-induced vibration under controllable damping, to submarine pipeline vortex exciting disclosed in embodiment 1
Dynamic simulator installs control damping unit 8A, structure are as follows: be additionally provided with an additional springs 84 in the middle part of the cross bar 54, lead at this time additional
Spring and additional springs work at the same time；Lead screw pair 83 is installed on the upside of the additional springs 84, the lead screw pair 83 be equipped with
The servo motor 81 of retarder 82 is connected；The servo motor is connected with the control host 1；The control host 1 can be controlled
The revolving speed of the servo motor 81 is made, and then adjusts the length of the lead screw pair 83, so as to adjust the length of the additional springs 84
Degree.
Specifically, the feed screw nut of lead screw pair 83 is fixed on 82 side of retarder, lead screw lower end is directly or connecting shaft
It is connect after holding with additional springs 84.
It is as follows that the step of pipeline vortex-induced vibration under controllable damping simulates re-test is carried out using the device:
1) to simulation pipeline 51 apply a downward displacement, the corresponding output voltage of recording laser displacement sensor, and
By being fitted the calibration coefficient obtained between displacement and voltage, calibration coefficient is imported, laser displacement sensor is demarcated；
2) it measures the damped coefficient of free oscillating system: applying a downward displacement to simulation pipeline 51 and then decontrol,
System is enabled to carry out free vibration under only by gravity；The decaying of free vibration amplitude is recorded using laser displacement sensor 7
Process, according to formula ζ=ln (Ai/Ai+n2 π n of)/() calculate damped coefficient, wherein AiAnd Ai+nRepresent i-th and i+n free vibration
Amplitude；
Next be measured to the stiffness coefficient of main spring 55: applying an external force to main spring 55 makes its elongation, benefit
Applied external force is recorded with pull pressure sensor 4, measures the length that main spring 55 extends using laser displacement sensor 7, so
Afterwards according to formula K1=F1/X1The stiffness coefficient of main spring 55 is calculated, wherein K1For the stiffness coefficient of main spring 55, X1For main spring
The length of elongation, F1For the pulling force applied；
3) test the stiffness coefficient of additional springs 84: applying an external force to additional springs makes its elongation, utilizes laser position
Displacement sensor 7 measures the length of its elongation, the size for applying external force is measured using pull pressure sensor, according to formula K2=F2/X2
The stiffness coefficient of additional springs 84 is calculated, wherein K2For the stiffness coefficient of additional springs, X2For the length of additional springs elongation, F2
For the external force applied；
4) the experiment depth of water, 10 times for about simulating 51 diameter of pipeline are added water into sink；Open the resistance in control host
Buddhist nun's motion control program inputs the stiffness coefficient K of additional springs in a control program2And expected additional damping C1；Control journey
Sequence is then according to formula X=C1/K2The moving displacement X for controlling lead screw pair 83 is calculated, the corresponding control signal of control program sending is watched
Motor 81 is taken, then passes through the conversion of retarder 82, becomes the moving displacement X of lead screw pair 83, to control additional springs 84
Elongation and shortening, to play the effect of additional movement damping；
5) using during current meter measurement experiment water velocity, utilize laser displacement sensor to measure pipe vibration position
It moves, measure pipeline stress using pull pressure sensor；By to water velocity, three data of vibration displacement and pipeline stress it is same
Step analysis to judge the severe degree of pipeline vortex-induced vibration, and finally predicts a possibility that fatigue rupture occurs for pipeline.
Embodiment 3
In order to carry out the simulation of submarine pipeline forced vibration, submarine pipeline vortex-induced vibration disclosed in embodiment 2 is simulated and is filled
It sets and modifies, replace main spring 55 using rigid link, remove additional springs 84, the feed screw nut of lead screw pair 83 is fixed on
82 side of retarder will be connect after lead screw lower end connection bearing with cross bar 63.
It is as follows that the step of submarine pipeline forced vibration is simulated is carried out using the device:
1) to simulation pipeline 51 apply a downward displacement, the corresponding output voltage of recording laser displacement sensor, and
By being fitted the calibration coefficient obtained between displacement and voltage, calibration coefficient is imported, laser displacement sensor is demarcated；
2) the experiment depth of water is added water into sink, is specifically as follows 10 times or so of simulation 51 diameter of pipeline；In hydrostatic or
Under the fixed water velocity of person, 81 1 fixed sinusoidal signals of servo motor are given by controlling host 1, to control the lead screw
The vibration amplitude and frequency of pair output, pipeline model movement mechanism 5 moves under the action of lead screw pair.
Claims (5)
1. a kind of submarine pipeline vortex-induced vibration simulator, it is characterised in that: including sink, braced frame (6), pipeline model fortune
Motivation structure (5) and test macro；
The braced frame (6) is by being erected on the sink along upper crossbeam (61), being vertically set on the crossbeam (61)
Two vertical beams (62) and be set to described two vertical beams (62) lower part stull (63) composition；The braced frame (6) is
The rectangular frame for the fixation that the crossbeam (61), two vertical beams (62) and stull (63) are constituted；
The pipeline model movement mechanism, including simulation pipeline (51), linear guide (52), guide rail slide block (53) and cross bar
(54)；The guide rail slide block (53) has four pieces, is respectively symmetrically fixed on described two vertical beams (62)；The linear guide (52)
There are two, be mounted on described two vertical beams (62) by guide rail slide block (53) respectively, the linear guide (52) can freely on
Lower movement；The cross bar (54), simulation pipeline (51) are separately positioned on the upper/lower terminal of the linear guide (52), constitute one
A rectangular configuration；Cross bar (54) two sides are respectively arranged with main spring (55), are connected to institute by main spring (55) or connecting rod
It states on crossbeam (61)；
The test macro includes control host (1), laser displacement sensor (7), pull pressure sensor (4) and current meter；Institute
It states there are two pull pressure sensor (4), is respectively arranged in linear guide (52) and pipeline model (51) intersection；The laser position
Displacement sensor (7) is mounted on the crossbeam (61)；The current meter is mounted on simulation pipeline (51) side；The laser displacement
Sensor (7), pull pressure sensor (4) and current meter pass through data line respectively and connect with the control host (1)；
An additional springs (84) is additionally provided in the middle part of the cross bar (54)；Lead screw pair is installed on the upside of the additional springs (84)
(83), the lead screw pair (83) is connected with the servo motor (81) for being equipped with retarder (82)；The servo motor with it is described
Host (1) is controlled to be connected；Control host (1) can control the revolving speed of the servo motor (81), and then adjust the lead screw
The length of secondary (83), so as to adjust the length of the additional springs (84).
2. submarine pipeline vortex-induced vibration simulator as described in claim 1, it is characterised in that: the lead screw of the lead screw pair (83)
Nut is fixed on retarder (82) side, and lead screw lower end directly or after connection bearing is connect with additional springs (84).
3. submarine pipeline vortex-induced vibration simulator as claimed in claim 1 or 2, it is characterised in that: main spring (55) quilt
Rigid link is replaced, and the additional springs (84) are removed, and the lead screw pair (83) is connected directly between the retarder (82)
It is connected with cross bar (63).
4. carrying out the pipeline whirlpool under controllable damping using submarine pipeline vortex-induced vibration simulator as claimed in claim 1 or 2 to swash
Vibration simulation, it is characterised in that include the following steps:
1) apply a downward displacement, the corresponding output voltage of recording laser displacement sensor to simulation pipeline (51), and lead to
Over-fitting obtains the calibration coefficient between displacement and voltage, imports calibration coefficient, demarcates to laser displacement sensor；
2) it measures the damped coefficient of free oscillating system: applying a downward displacement to simulation pipeline (51) and then decontrol, enable
System carries out free vibration under only by gravity；Utilize the decaying of laser displacement sensor (7) record free vibration amplitude
Process, according to formula ζ=ln (Ai/Ai+n2 π n of)/() calculate damped coefficient, wherein AiAnd Ai+nRepresent i-th and i+n free vibration
Amplitude；
Measure the stiffness coefficient of main spring (55): applying an external force to main spring (55) makes its elongation, is sensed using pressure
Device (4) records applied external force, the length extended using laser displacement sensor (7) measurement main spring (55), then basis
Formula K1=F1/X1The stiffness coefficient of main spring (55) is calculated, wherein K1For the stiffness coefficient of main spring (55), X1It is stretched for main spring
Long length, F1For the pulling force applied；
3) test the stiffness coefficient of additional springs (84): applying an external force to additional springs makes its elongation, utilizes laser displacement
Sensor (7) measures the length of its elongation, the size for applying external force is measured using pull pressure sensor, according to formula K2=F2/X2
The stiffness coefficient of additional springs (84) is calculated, wherein K2For the stiffness coefficient of additional springs, X2For additional springs elongation length,
F2For the external force applied；
4) the experiment depth of water is added water into sink；It opens the damped motion in control host and controls program, it is defeated in a control program
Enter the stiffness coefficient K of additional springs2And expected additional damping C1；Program is controlled then according to formula X=C1/K2Calculate control
The moving displacement X of lead screw pair (83), control program issue corresponding control signal and give servo motor (81), then pass through retarder
(82) conversion, becomes the moving displacement X of lead screw pair (83), so that the elongation and shortening of additional springs (84) are controlled, to play
The effect of additional movement damping.
5. submarine pipeline forced vibration simulation is carried out using submarine pipeline vortex-induced vibration simulator as claimed in claim 3,
It is characterized in that including the following steps:
1) apply a downward displacement, the corresponding output voltage of recording laser displacement sensor to simulation pipeline (51), and lead to
Over-fitting obtains the calibration coefficient between displacement and voltage, imports calibration coefficient, demarcates to laser displacement sensor；
2) the experiment depth of water is added water into sink；Under hydrostatic or fixed water velocity, servo is given by control host (1)
(81) fixed sinusoidal signals of motor, to control the vibration amplitude and frequency of the lead screw pair output, in the work of lead screw pair
It is moved with lower pipeline model sport mechanism (5).
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