CN106679791A - Simulation device for vortex-induced vibration of submarine pipeline and experimental method - Google Patents
Simulation device for vortex-induced vibration of submarine pipeline and experimental method Download PDFInfo
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- CN106679791A CN106679791A CN201611160735.6A CN201611160735A CN106679791A CN 106679791 A CN106679791 A CN 106679791A CN 201611160735 A CN201611160735 A CN 201611160735A CN 106679791 A CN106679791 A CN 106679791A
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Abstract
The invention discloses a simulation device for vortex-induced vibration of a submarine pipeline and an experimental method. The simulation device comprises a water tank, a rectangular support frame, a pipeline model movement mechanism and a test system. The support frame is set up on the water tank. The pipeline model movement mechanism includes a simulation pipeline, two linear guide rails and a cross bar which constitute a rectangle. The two linear guide rails are mounted on the support frame respectively through guide rail blocks, and the cross bar is arranged on the top and connected to an upper beam of the support frame by means of two main springs. Test instruments in the test system are installed and then connected with a control host. The vortex-induced vibration of the pipeline under controllable damping can be simulated for the structure by installing a damping control device. When an experiment is carried out by the device, the instrument is calibrated first, and the damping coefficient of a free vibration system and the stiffness coefficient of the springs are measured by the device in a water injecting experiment. The device can be used to systematically study the vortex vibration trigger and amplitude and other issues, and the results can be referred to in the engineering design of a submarine pipeline.
Description
Technical field
The present invention relates to field of ocean engineering, more particularly to a kind of submarine pipeline vortex-induced vibration analog and reality
Proved recipe method.
Background technology
Alternate vortex shedding phenomenon is formed in ocean engineering when ocean current is through hanging submarine pipeline in its rear can,
Produce periodicity active force.Hanging submerged pipeline equivalent to a spring-damper system, with specific frequency.Work as pipeline
Natural frequency and fluid vortex shedding frequency it is close when, spontaneous generation vortex-induced vibration, long term will be caused by submarine pipeline
The fatigue rupture of pipeline.
Vortex-induced vibration is a complicated fluid structurecoupling problem, and laboratory simulation is a kind of important research meanses.Generally
Experimental simulation device include pipeline model, groups of springs, sliding rail and structural framing etc., collectively constitute a spring-damper
Vibrational system.There is critical velocity, vibration amplitude and the frequency of vibration in experiment by changing water velocity to study pipeline model
Rate etc..Damping is a key factor for affecting vortex-induced vibration characteristic, and damping in model test mostlys come from inside configuration
Frictional damping.Generally frictional damping changes with vibration amplitude, therefore the precise determination for damping is difficult in testing；Rub simultaneously
Damping is difficult to eliminate and change again, and this is just largely limited with regard to damping for the research that vortex-induced vibration affects.
The content of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of submarine pipeline vortex-induced vibration analog and experiment side
Method, the device are simulated in laboratory sink and propose a kind of submarine pipeline vortex-induced vibration simulation and measuring method, to system
The problems such as triggering of research vortex-induced vibration and amplitude, the engineering that achievement in research is applied to submerged pipeline accurately, can be set by test result
Meter.
For this purpose, technical scheme is as follows：
A kind of submarine pipeline vortex-induced vibration analog, including tank, support frame, pipeline model motion and test
System；
The support frame is erected along upper crossbeam, be vertically set on the crossbeam two by being erected on the tank
Beam and be arranged at described two vertical beam bottoms stull composition；The support frame is the crossbeam, two vertical beams and horizontal stroke
The rectangular frame of the fixation that support is constituted；
The pipeline model motion, including simulation pipeline, line slideway, guide rail slide block and cross bar；The guide rail is slided
Block has four pieces, is respectively symmetrically and is fixed on described two vertical beams；The line slideway has two, is installed by guide rail slide block respectively
On described two vertical beams, the line slideway freely can 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 both sides are respectively arranged with main spring, by main spring or
Connecting rod is connected on the crossbeam；
The test system includes control main frame, laser displacement sensor, pull pressure sensor and current meter；The tension and compression
Force transducer has two, is respectively arranged in line slideway and pipeline model intersection；The laser displacement sensor is arranged on institute
State on crossbeam；The current meter is arranged on simulation pipeline side；The laser displacement sensor, pull pressure sensor and current meter
It is connected with the control main frame by data wire respectively.
The pipeline vortex-induced vibration simulation under free damping is carried out using as above submarine pipeline vortex-induced vibration analog, including
Following steps：
1) apply a downward displacement, the corresponding output voltage of recording laser displacement transducer to simulation pipeline, and lead to
Over-fitting draws the calibration coefficient between displacement and voltage, imports calibration coefficient, laser displacement sensor is demarcated；
2) determine the damped coefficient of free oscillating system：Apply a downward displacement to simulation pipeline and then decontrol, order
System carries out free vibration under only by action of gravity；The decay of free vibration amplitude is recorded using laser displacement sensor
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；
Determine the stiffness coefficient of main spring：Applying an external force to main spring extends which, is remembered using pull pressure sensor
The applied external force of record, measures the length of main spring elongation using laser displacement sensor, then according to formula K1=F1/X1Meter
Calculate the stiffness coefficient of main spring, wherein K1For the stiffness coefficient of main spring, X1For the length of main spring elongation, F1Applied
Pulling force；
3) water is added to water level is tested in tank, about simulate pipe diameter 10 times；Start experiment, set using tank end
The water pump put drives water body flow in tank, water velocity is at the uniform velocity increased, until pipeline occurs vortex-induced vibration.
Further, an additional springs are additionally provided with the middle part of the cross bar；Leading screw is installed to pay on the upside of the additional springs, institute
State leading screw and pay and the servomotor of decelerator is installed is connected；The servomotor is connected with the control main frame；The control
Main frame processed can control the rotating speed of the servomotor, and then adjust the length that the leading screw is paid, so as to adjust the additional springs
Length.It is preferred that, the feed screw nut that the leading screw is paid is fixed on decelerator side, leading screw lower end directly or after connection bearing with
Additional springs connect.
The pipeline vortex-induced vibration simulation under controllable damping is carried out using submarine pipeline vortex-induced vibration analog as described above,
Comprise the steps：
1) apply a downward displacement, the corresponding output voltage of recording laser displacement transducer to simulation pipeline, and lead to
Over-fitting draws the calibration coefficient between displacement and voltage, imports calibration coefficient, laser displacement sensor is demarcated；
2) determine the damped coefficient of free oscillating system：Apply a downward displacement to simulation pipeline and then decontrol, order
System carries out free vibration under only by action of gravity；The decay of free vibration amplitude is recorded using laser displacement sensor
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；
Determine the stiffness coefficient of main spring：Applying an external force to main spring extends which, is remembered using pull pressure sensor
The applied external force of record, measures the length of main spring elongation using laser displacement sensor, then according to formula K1=F1/X1Meter
Calculate the stiffness coefficient of main spring, 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 extends which, using laser displacement
Sensor measures the length of its elongation, the size for applying external force is measured using pull pressure sensor, according to formula K2=F2/X2Meter
Calculate the stiffness coefficient of additional springs, wherein K2For the stiffness coefficient of additional springs, X2For the length of additional springs elongation, F2For institute
The external force of applying；
4) the experiment depth of water is added water to in tank；The damped motion control program in control main frame is opened, in control program
The stiffness coefficient K of middle input additional springs2And expected additional damping C1；Control program is then according to formula X=C1/K2Calculate
The moving displacement X that control leading screw is paid, control program send corresponding control signal to servomotor, then turning by decelerator
Change, become the moving displacement X that leading screw is paid, so as to control the elongation and shortening of additional springs, to play the effect of additional movement damping
Really.
Further, the main spring is replaced by rigid link, removes the additional springs, the leading screw is paid and is directly connected
It is connected on the decelerator and cross bar connection.Submarine pipeline forced vibration mould is carried out using the submarine pipeline vortex-induced vibration analog
Intend, comprise the steps：
1) to the simulation one downward displacement of applying of pipeline 51, the corresponding output voltage of recording laser displacement transducer, and
Calibration coefficient between displacement and voltage is drawn by fitting, calibration coefficient is imported, laser displacement sensor is demarcated；
2) the experiment depth of water is added water to in tank；Under hydrostatic or fixed water velocity, watch by control main frame 1 is given
81 1 fixed sinusoidal signals of motor are taken, vibration amplitude and frequency that the leading screw pays output is controlled, in the work that leading screw is paid
Moved with lower pipeline model sport mechanism 5.
The submarine pipeline vortex-induced vibration analog and experimental technique that the present invention is provided has following features：
(1) adjustable system damping
The at present damping in laboratory in the simulation of pipeline vortex-induced vibration essentially from structural damping, both it is difficult to determine, also not
Can eliminate, therefore material impact is brought to accurate research vortex-induced vibration characteristic.The present invention adopts active control technology, measures in real time
Structural vibration displacement simultaneously feeds back to control main frame, by the real-time speed that model sport is obtained to displacement derivation, while analyzing
To real-time system damping.Due to damping force be it is proportional with speed, therefore by control main frame give servomotor pass
Defeated corresponding signal, changes the length of additional springs, applies a spring force being directly proportional to speed to structure additional to produce
Damping force, so as to realize the change of system total damping.The method can both increase damping, it is also possible to eliminate damping, even in fact
Existing negative damping.
(2) closed-loop control systems are adopted
By the concept for automatically controlling and theoretical origin in the design of device.By laser displacement sensor, data cable,
Data collecting card, control program, AC servo motor, decelerator, connecting rod, additional springs, pipeline model and laser displacement sensing
A close loop control circuit is formed between device.AC servo driver carries integrated EMC wave filter, and motor shaft end is with coding
Device, motor internal are provided with position, speed and current feedback.Servosystem adopts local control model, by integrative display terminal
Drive parameter is set drive signal is provided for AC servo motor.Can be accurately controlled based on ISA/PCI buses and be sent
Pulse frequency (motor speed), pulse number (motor corner) and frequency change rate (motor acceleration), disclosure satisfy that total
The various complex controls of word servomotor are required.This control program realizes accurate timing using split-second precision function, can improve
The control accuracy of additional movement damping.
(3) many 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 current
The association of multiple physical parameters such as speed.Traditional metering system generally to parameters independent measurement, is then processed, this
Sample is difficult to analyze the interactive quantitative effect of each physical factor, and obtains reflection engineering objective law in practice and each pass
Quantitative relationship between key parameter, especially for the fluid structurecoupling problem that vortex-induced vibration is so complicated.The synchronized measurement system
Hardware foundation for NI companies USB-6255 high-speed synchronous data acquiring cards, can be with the analogue signal of 64 passages of synchronous acquisition
And the digital output signal of 8 passages can be produced, laser displacement sensor, pull pressure sensor and ADV stream can be gathered simultaneously
The data signal of fast instrument.Signal is changed using the calibration curve of each sensor, be changed into physical parametric data, institute
Some supplemental characteristics are stored in same file, realize synchronism detection and the analysis of many physical parameters.
(4) multipurpose and autgmentability of apparatus function
Vortex-induced vibration is a kind of motion of generation spontaneous due to the effect of fluid, and this device is except realizing that damping can
Outside the vortex-induced vibration of control, model realization forced movement can also be directly driven using servomotor.Can be with by forced movement
It was found that some fundamental characteristics and rule in flow field.Now, groups of springs is removed, connecting rod is directly connected to into pipeline model fitness machine
Structure, by the rotating speed of regulation motor, changes the period of motion and amplitude, to realize the forced movement of pipeline model.
Additionally, many physical parameter synchronized measurement systems provide open data acquisition scheme, i.e., for different are ground
Study carefully project, can arbitrarily add and delete acquisition channel as needed, that is, increase the type and quantity of sensor, be at data post
Reason is provided a great convenience.
Description of the drawings
The structural representation of the submarine pipeline vortex-induced vibration analog that Fig. 1 is provided for the present invention.
Specific embodiment
Technical scheme 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 analog, including tank, support frame 6, pipeline model fortune
Motivation structure 5 and test system；
The support frame 6 is by being erected on the tank along upper crossbeam 61, be vertically set on the crossbeam 61
Two vertical beams 62, and it is arranged at the stull 63 of 62 bottom of described two vertical beams and constitutes；The support frame 6 is the crossbeam
61st, two vertical beams 62, and the rectangular frame of fixation that constitutes of stull 63；(63, two vertical beams 62 of stull are may be contained within tank
Portion)
The pipeline model motion, including simulation pipeline 51, line slideway 52, guide rail slide block 53 and cross bar 54；Institute
Stating guide rail slide block 53 has four pieces, is respectively symmetrically and is fixed on described two vertical beams 62；The line slideway 52 has two, leads to respectively
Guide rail slide block 53 is crossed on described two vertical beams 62, the line slideway 52 freely can move up and down；The cross bar 54, mould
Intend the upper/lower terminal that pipeline 51 is separately positioned on the line slideway 52, constitute a rectangular configuration；54 both sides of the cross bar point
Main spring 55 is not provided with, is connected on the crossbeam 61 by main spring 55 or connecting rod；
The test system includes control main frame 1, laser displacement sensor 7, pull pressure sensor 4 and current meter；It is described
Pull pressure sensor 4 has two, is respectively arranged in line slideway 52 and 51 intersection of pipeline model；The laser displacement sensor
7 are arranged on the crossbeam 61；The current meter is arranged on 51 side of simulation pipeline；The laser displacement sensor 7, pressure
Sensor 4 and current meter are connected with the control main frame 1 by data wire respectively.
The device can be used for the pipeline vortex-induced vibration simulation re-test under free damping, and step is as follows：
1) to the simulation one downward displacement of applying of pipeline 51,7 corresponding output voltage of recording laser displacement transducer, and
Calibration coefficient between displacement and voltage is drawn by fitting, calibration coefficient is imported, laser displacement sensor 7 is demarcated；
2) determine the damped coefficient of free oscillating system：Apply a downward displacement to simulation pipeline 51 and then decontrol,
System is made to carry out free vibration under only by action of gravity；The decay 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 the stiffness coefficient of main spring 55 is measured：Applying an external force to main spring 55 extends which, profit
Applied external force is recorded with pull pressure sensor 4, the length of the elongation of main spring 55 is measured using laser displacement sensor 7, so
Afterwards according to formula K1=F1/X1Calculate the stiffness coefficient of main spring 55, wherein K1For the stiffness coefficient of main spring 55, X1For main spring
The length of elongation, F1By the pulling force for applying；
3) water is added to water level is tested in tank, about simulate 51 diameter of pipeline 10 times.Start experiment, using tank end
The water pump of setting drives water body flow in tank, water velocity is at the uniform velocity increased, until pipeline occurs vortex-induced vibration；
4) water velocity in experimentation is measured using current meter, pipe vibration position is measured using laser displacement sensor
Move, pipeline stress is measured using pull pressure sensor；By to water velocity, three data of vibration displacement and pipeline stress it is same
Step analysis, to the severe degree for judging pipeline vortex-induced vibration, and finally predicts that pipeline occurs the probability of fatigue rupture.
Embodiment 2
In order to carry out the simulation of the pipeline vortex-induced vibration under controllable damping, to the submarine pipeline vortex exciting disclosed in embodiment 1
Dynamic analog installs control damping unit 8A additional, and structure is：An additional springs 84 are additionally provided with the middle part of the cross bar 54, are now led
Spring and additional springs are worked simultaneously；Be provided with the upside of the additional springs 84 leading screw pay 83, the leading screw pay 83 be provided with
The servomotor 81 of decelerator 82 is connected；The servomotor is connected with the control main frame 1；The control main frame 1 can be controlled
The rotating speed of the servomotor 81 is made, and then adjusts the length that the leading screw pays 83, so as to adjust the length of the additional springs 84
Degree.
Specifically, leading screw is paid 83 feed screw nut and is fixed on 82 side of decelerator, and leading screw lower end is directly or connecting shaft
It is connected with additional springs 84 after holding.
The step of pipeline vortex-induced vibration simulation re-test under controllable damping is carried out using the device is as follows：
1) to the simulation one downward displacement of applying of pipeline 51, the corresponding output voltage of recording laser displacement transducer, and
Calibration coefficient between displacement and voltage is drawn by fitting, calibration coefficient is imported, laser displacement sensor is demarcated；
2) determine the damped coefficient of free oscillating system：Apply a downward displacement to simulation pipeline 51 and then decontrol,
System is made to carry out free vibration under only by action of gravity；The decay 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 the stiffness coefficient of main spring 55 is measured：Applying an external force to main spring 55 extends which, profit
Applied external force is recorded with pull pressure sensor 4, the length of the elongation of main spring 55 is measured using laser displacement sensor 7, so
Afterwards according to formula K1=F1/X1Calculate the stiffness coefficient of main spring 55, wherein K1For the stiffness coefficient of main spring 55, X1For main spring
The length of elongation, F1By the pulling force for applying；
3) test the stiffness coefficient of additional springs 84：Applying an external force to additional springs extends which, using 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
Calculate the stiffness coefficient of additional springs 84, wherein K2For the stiffness coefficient of additional springs, X2For the length of additional springs elongation, F2
By the external force for applying；
4) the experiment depth of water, about simulate 51 diameter of pipeline 10 times are added water to in tank；Open the resistance in control main frame
Buddhist nun's motion control program, is input into 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 that control leading screw pays 83 is calculated, control program sends corresponding control signal to watching
Motor 81 is taken, then by the conversion of decelerator 82, becomes the moving displacement X that leading screw pays 83, so as to control additional springs 84
Elongation and shortening, to play the effect of additional movement damping；
5) water velocity in experimentation is measured using current meter, pipe vibration position is measured using laser displacement sensor
Move, pipeline stress is measured using pull pressure sensor；By to water velocity, three data of vibration displacement and pipeline stress it is same
Step analysis, to the severe degree for judging pipeline vortex-induced vibration, and finally predicts that pipeline occurs the probability of fatigue rupture.
Embodiment 3
In order to carry out the simulation of submarine pipeline forced vibration, to submarine pipeline vortex-induced vibration simulation dress disclosed in embodiment 2
Putting and modifying, main spring 55 is replaced using rigid link, remove additional springs 84, the feed screw nut that leading screw pays 83 is fixed on
82 side of decelerator, is connected with cross bar 63 after leading screw lower end is connected bearing.
Carried out using the device as follows the step of submarine pipeline forced vibration is simulated：
1) to the simulation one downward displacement of applying of pipeline 51, the corresponding output voltage of recording laser displacement transducer, and
Calibration coefficient between displacement and voltage is drawn by fitting, calibration coefficient is imported, laser displacement sensor is demarcated；
2) the experiment depth of water is added water to in tank, be specifically as follows 10 times or so of simulation 51 diameter of pipeline；In hydrostatic or
Person is fixed under water velocity, is given 81 1 fixed sinusoidal signals of servomotor by control main frame 1, is controlled the leading screw
The vibration amplitude and frequency of output are paid, pipeline model motion 5 is moved in the presence of leading screw is paid.
Claims (7)
1. a kind of submarine pipeline vortex-induced vibration analog, it is characterised in that：Including tank, support frame (6), pipeline model fortune
Motivation structure (5) and test system；
The support frame (6) is by being erected on the tank along upper crossbeam (61), be vertically set on the crossbeam (61)
Two vertical beams (62), and be arranged at described two vertical beams (62) bottom stull (63) composition；The support frame (6) is
The crossbeam (61), two vertical beams (62), and the rectangular frame of fixation that constitutes of stull (63)；
The pipeline model motion, including simulation pipeline (51), line slideway (52), guide rail slide block (53) and cross bar
(54)；The guide rail slide block (53) has four pieces, is respectively symmetrically and is fixed on described two vertical beams (62)；The line slideway (52)
Have two, respectively by guide rail slide block (53) on described two vertical beams (62), the line slideway (52) can freely on
Lower motion；The cross bar (54), simulation pipeline (51) are separately positioned on the upper/lower terminal of the line slideway (52), constitute one
Individual rectangular configuration；Cross bar (54) both sides are respectively arranged with main spring (55), are connected to institute by main spring (55) or connecting rod
State on crossbeam (61)；
The test system includes control main frame (1), laser displacement sensor (7), pull pressure sensor (4) and current meter；Institute
Stating pull pressure sensor (4) has two, is respectively arranged in line slideway (52) and pipeline model (51) intersection；The laser position
Displacement sensor (7) is on the crossbeam (61)；The current meter is arranged on simulation pipeline (51) side；The laser displacement
Sensor (7), pull pressure sensor (4) and current meter are connected with the control main frame (1) by data wire respectively.
2. submarine pipeline vortex-induced vibration analog as claimed in claim 1, it is characterised in that：Also set in the middle part of the cross bar (54)
There is an additional springs (84)；Leading screw is installed on the upside of the additional springs (84) and pays (83), the leading screw is paid (83) and installed
The servomotor (81) for having decelerator (82) is connected；The servomotor is connected with the control main frame (1)；The control master
Machine (1) can control the rotating speed of the servomotor (81), and then adjust the length that the leading screw pays (83), described attached so as to adjust
Plus the length of spring (84).
3. submarine pipeline vortex-induced vibration analog as claimed in claim 2, it is characterised in that：The leading screw pays the leading screw of (83)
Nut is fixed on decelerator (82) side, and leading screw lower end directly or after connection bearing is connected with additional springs (84).
4. the submarine pipeline vortex-induced vibration analog as described in Claims 2 or 3, it is characterised in that：Main spring (55) quilt
Rigid link is replaced, and removes the additional springs (84), is paid (83) by the leading screw and is connected directly between the decelerator (82)
Connect with cross bar (63).
5. the pipeline vortex-induced vibration under free damping is carried out using submarine pipeline vortex-induced vibration analog as claimed in claim 1
Simulation, it is characterised in that comprise the steps：
1) to simulation pipeline (51) one downward displacement of applying, the corresponding output voltage of recording laser displacement transducer (7), and
Calibration coefficient between displacement and voltage is drawn by fitting, calibration coefficient is imported, rower is entered to laser displacement sensor (7)
It is fixed；
2) determine the damped coefficient of free oscillating system：Apply a downward displacement to simulation pipeline (51) and then decontrol, order
System carries out free vibration under only by action of gravity；The decay 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；
Determine the stiffness coefficient of main spring (55)：Applying an external force to main spring (55) extends which, is sensed using pressure
Device (4) records applied external force, measures the length that main spring (55) extends using laser displacement sensor (7), then basis
Formula K1=F1/X1Calculate the stiffness coefficient of main spring (55), wherein K1For the stiffness coefficient of main spring (55), X1Stretch for main spring
Long length, F1By the pulling force for applying；
3) in tank add water to water level is tested, water body flow in tank is driven using the water pump that tank end is arranged, make current
Speed at the uniform velocity increases, until pipeline occurs vortex-induced vibration.
6. swash in the pipeline whirlpool carried out using the submarine pipeline vortex-induced vibration analog as described in Claims 2 or 3 under controllable damping
Vibration simulation, it is characterised in that comprise the steps：
1) apply a downward displacement, the corresponding output voltage of recording laser displacement transducer to simulation pipeline (51), and lead to
Over-fitting draws the calibration coefficient between displacement and voltage, imports calibration coefficient, laser displacement sensor is demarcated；
2) determine the damped coefficient of free oscillating system：Apply a downward displacement to simulation pipeline (51) and then decontrol, order
System carries out free vibration under only by action of gravity；The decay 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；
Determine the stiffness coefficient of main spring (55)：Applying an external force to main spring (55) extends which, is sensed using pressure
Device (4) records applied external force, measures the length that main spring (55) extends using laser displacement sensor (7), then basis
Formula K1=F1/X1Calculate the stiffness coefficient of main spring (55), wherein K1For the stiffness coefficient of main spring (55), X1Stretch for main spring
Long length, F1By the pulling force for applying；
3) test the stiffness coefficient of additional springs (84)：Applying an external force to additional springs extends which, using 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
Calculate the stiffness coefficient of additional springs (84), wherein K2For the stiffness coefficient of additional springs, X2For additional springs elongation length,
F2By the external force for applying；
4) the experiment depth of water is added water to in tank；The damped motion control program in control main frame is opened, it is defeated in a control program
Enter the stiffness coefficient K of additional springs2And expected additional damping C1；Control program is then according to formula X=C1/K2Calculate control
Leading screw pays the moving displacement X of (83), and control program sends corresponding control signal and gives servomotor (81), then by decelerator
(82) conversion, becomes the moving displacement X that leading screw pays (83), so as to control the elongation and shortening of additional springs (84), to play
The effect of additional movement damping.
7. submarine pipeline forced vibration simulation is carried out using submarine pipeline vortex-induced vibration analog as claimed in claim 4, its
It is characterised by comprising the steps：
1) apply a downward displacement, the corresponding output voltage of recording laser displacement transducer to simulation pipeline (51), and lead to
Over-fitting draws the calibration coefficient between displacement and voltage, imports calibration coefficient, laser displacement sensor is demarcated；
2) the experiment depth of water is added water to in tank；Under hydrostatic or fixed water velocity, by the given servo of control main frame (1)
(81) fixed sinusoidal signals of motor, control vibration amplitude and frequency that the leading screw pays output, in the work that leading screw is paid
Moved with lower pipeline model sport mechanism (5).
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