CN211718006U - Experimental device for simulating impact effect of falling objects on submerged pipeline cable - Google Patents
Experimental device for simulating impact effect of falling objects on submerged pipeline cable Download PDFInfo
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- CN211718006U CN211718006U CN201922004259.4U CN201922004259U CN211718006U CN 211718006 U CN211718006 U CN 211718006U CN 201922004259 U CN201922004259 U CN 201922004259U CN 211718006 U CN211718006 U CN 211718006U
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Abstract
The utility model provides an experimental device for simulating impact effect of falling objects on a submerged pipe cable, which consists of four parts, namely a simulation water tank and a soil box, a ship movement and falling object throwing system, a pipe cable model and measuring system, a control host and a synchronizer, the impact process of the submarine buried pipe cable can be simulated when the ship in motion state is emergently anchored, the instantaneous impact process is captured, the generated data is analyzed and researched, and the optical fiber strain sensor and the micro pressure sensor are adopted, so that the appearance size, the structural strength and the mechanical property of the pipe cable are not influenced in comparison with the traditional mode, the test result is more accurate and closer to reality, meanwhile, a synchronizer is adopted to control strain measurement, impact force measurement, falling object speed measurement and a soil mass measuring instrument, so that synchronous measurement and recording of all physical parameters are realized, and the revealing and analysis of an impact process and a damage mechanism of a pipe cable are facilitated.
Description
Technical Field
The utility model relates to a harbour, ocean, traffic engineering field especially relate to an experimental apparatus that simulation is hidden and is buried pipe cable and receive junk impact effect.
Background
Submarine pipeline cable structures such as submarine tunnels, oil pipelines and communication optical cables are similar ocean engineering structure types and play an important role in the fields of offshore traffic, ocean energy, pipeline communication and the like. Such umbilical structures are typically buried at a depth below the surface of the seabed and protected by a cover layer. With the rapid development of the marine shipping industry, the near sea area covered by ports is larger and larger, the tonnage of ships is developed towards large scale, the density of the ships entering and exiting the ports is greatly improved, and particularly when an underwater pipe cable structure cannot avoid passing through the port area, the situations of large ship emergency anchor dropping, ship container sliding and the like are caused, so that the pipe cable structure in the seabed is likely to be impacted, the underwater pipe cable is damaged, and related events happen frequently in recent years. Once damaged, these umbilical structures cause an immeasurable loss in traffic, energy and communication.
Therefore, the method is beneficial to the selection and design of the protective covering layer on the upper part of the pipe cable, which is important for the safe operation and maintenance of the underwater buried pipe cable. Due to the anisotropy of the properties of the seabed soil body and the discreteness of the protective layer material, the numerical model is difficult to truly restore the action process of ship emergency anchoring on the buried pipe cable. Therefore, the simulation of the impact process of the ship emergency anchor and the falling object on the buried pipe cable through the physical model experiment is an effective and reliable research means.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides a simulation is hidden buried pipe cable and is received junk impact effect's experimental apparatus for predict and study hidden buried pipe cable and receive junk impact effect's experiment, simulated the transient state of junk to the pipe cable striking through simulation experiment device, utilize the synchronous ware to carry out synchronous analysis to hitting transient parameter simultaneously.
(II) technical scheme
The utility model provides an experimental device for simulating impact effect of falling objects on a submerged pipe cable, which comprises a simulation water tank and soil box system, a ship movement and falling object throwing system, a pipe cable model and measuring system, and a control host and a synchronizer which are arranged outside the simulation water tank, wherein,
simulation basin and soil box system includes: the device comprises a wave flow water tank, a model soil box, a water body, a foundation soil body and a covering layer, and is used for simulating external hydrodynamic force conditions, a seabed foundation and the covering layer, wherein the foundation soil body is laid at the bottom of the model soil box, a pipe cable model is placed and then covered by the covering layer, the model soil box is designed at the middle section of the bottom of the wave flow water tank in a sinking mode, and the surface elevation is equal to the bottoms of the wave flow water tanks at two sides;
the device is put in ship motion and electromagnetism junk throwing includes: the device comprises a guide rail, a horizontal sliding platform, a driving motor, an electromagnetic adsorption device and a falling object model, wherein the guide rail is used for simulating the movement of a ship and the throwing process of an object;
the umbilical model and measurement system includes: the device comprises an umbilical model, an optical fiber strain sensor, a micro pressure sensor and a high-speed camera which is arranged outside a water tank and perpendicular to the side wall of glass and used for measuring falling object movement and deformation and stress of the umbilical;
the synchronizer is connected with the optical fiber strain sensor, the miniature pressure sensor and the high-speed camera to perform synchronous control, and the control host is connected with and controls the synchronizer, the horizontal sliding platform and the electromagnetic falling object throwing device.
Wherein, the material of the pipe cable model adopts steel or aluminum or PE and PVC; and the interior of the pipe cable model is filled with a balance weight.
The optical fiber strain sensor array is arranged at the lower end and the two side ends of the annular surface of the pipe cable model respectively, and a plurality of optical fiber strain sensors are arranged at intervals in the axial direction of the surface of the pipe cable model by each optical fiber strain sensor array.
And the outer side of the optical fiber strain sensor array is encapsulated and protected by adopting a heat-shrinkable sleeve.
The miniature pressure sensor is arranged at the upper end of the annular surface of the pipe cable model, and the embedded design is adopted, so that the probe of the sensor is flush with the surface of the pipe wall.
The model soil box is arranged in the middle section of the wave-flow water tank, the sinking design is adopted, the surface elevation of the model soil box is made to be parallel to the bottoms of the wave-flow water tanks on two sides, and the wave-flow water tank and the model soil box are both made of transparent glass.
The horizontal sliding platform is installed on the guide rails in a crossing mode, and the horizontal sliding platform moves horizontally on the guide rails under the control of the driving motor.
The electromagnetic adsorption device is installed at the bottom of the horizontal sliding platform and used for adsorbing the falling object model and performing horizontal movement, the horizontal sliding platform can be accelerated from rest and reaches a preset position, the electromagnetic adsorption device is powered off, and the falling object model is thrown off.
(III) advantageous effects
According to the above technical scheme, the utility model discloses following beneficial effect has:
the utility model provides a sensor has the size little, and signal sensitivity is high, and the precision is high, and the interference killing feature is strong, and can settle inside the cable mould, only exposes the pipeline surface with the probe, can not influence the external dimension and the structural strength of cable, can not produce great advantages such as extra influence to the mechanical properties of structure, is fit for the high-speed instantaneous test of junk striking cable.
The utility model discloses a synchronizer will meet an emergency and measure, impact force is measured, the junk speed is measured and soil body measuring instrument utilizes the synchronizer to control, realizes the synchronous measurement and the record of each physical parameter, is favorable to revealing and the analysis of atress process and pipe cable damage mechanism.
Drawings
FIG. 1a is a schematic circumferential view of a pipe pattern layout.
FIG. 1b is an axial schematic view of a pipe pattern layout.
Fig. 2a is a side view of a wave flume.
FIG. 2b is a cross-sectional view of the wave-current water tank.
Description of the symbols
1 pipe cable model
2 optical fiber strain sensor
3 miniature pressure sensor
4 internal balance weight
5 soil box
6 water tank
7 horizontal sliding platform
8 falling object model
9 electromagnetic adsorption device
10 electric machine
11 ground base
12 cover layer
13 control host
14 synchronizer
15 high-speed camera
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the drawings or description, the same drawing reference numerals are used for similar or identical parts. Implementations not depicted or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. Directional phrases used in the embodiments, such as "upper," "lower," "front," "rear," "left," "right," and the like, refer only to the orientation of the figure. Therefore, the directional terminology used is intended to be in the nature of words of description rather than of limitation.
The utility model provides an experimental apparatus for simulation is hidden and is buried pipe cable and receive junk impact effect comprises following four bibliographic categories:
simulation basin and soil box system includes: the device comprises a wave water channel (adopting a glass side wall), a model soil box (adopting a glass side wall), a water body, a foundation soil body and a covering layer, and is used for simulating external hydrodynamic conditions, a seabed foundation and the covering layer.
Device is put in boats and ships motion and electromagnetism junk throwing includes: the device comprises a guide rail, a horizontal sliding platform, a driving motor, an electromagnetic adsorption device and a falling object model, and is used for simulating the movement of a ship and the throwing process of an object.
An umbilical model and measurement system comprising: the device comprises an umbilical model, an optical fiber strain sensor, a miniature pressure sensor and a high-speed camera outside a water tank, and is used for measuring falling object movement and deformation and stress of the umbilical.
Control host and synchronizer includes: the synchronizer is used for connecting the optical fiber strain sensor, the miniature pressure sensor, the high-speed camera and the like to perform synchronous control; and the control host is used for controlling the synchronizer, the horizontal sliding platform and the electromagnetic falling object throwing device.
The pipe cable model in the experiment can be made of different materials according to different problems of prototypes, and for structures with larger sizes and rigidity, such as a submarine tunnel, and the like, materials, such as a steel pipe or an aluminum pipe, and the like, can be adopted; for submarine optical cables and other relatively soft structures, hard rubber tubes can be adopted; for subsea hydrocarbon pipelines, of sizes and stiffnesses between the two, PE or PVC pipes may be used. The overall dimension of the pipe cable model is determined based on the geometric similarity principle, and the wall thickness of the pipe cable model is determined according to the water elasticity similarity principle. While filling the interior of the umbilical model with weights to ensure that the average density of the umbilical model and the prototype is the same. The length of the pipe cable model is the same as the width of the wave water channel and the placed model soil box.
Because the deformation of the umbilical model is in the elastic deformation range, the deformation of the upper surface and the lower surface is approximately the same, so the upper surface and the lower surface have the same value and opposite directions (positive and negative values). Respectively arranging an optical fiber strain sensor array at the lower end B and two side ends L, R of the annular surface of the pipe cable model, the utility model adopts an optical fiber grating sensor, as shown in figure 1 a; each optical fiber strain sensor array is provided with a plurality of strain measurement points (optical fiber grating sensors) at certain intervals in the axial direction of the pipeline. The utility model discloses set for the middle part that hits the tube and cable model after the junk model falls, near its deformation change is great, consequently near tube and cable model central part will meet an emergency the measuring point and set up relatively densely, and both ends department of keeping away from meets an emergency the measuring point and can be sparse relatively, as shown in FIG. 1 b. Because the fiber grating sensor has poor shearing resistance and is easy to break under the action of shearing force, the fiber grating sensor array needs to be specially packaged, for example, a heat-shrinkable sleeve is adopted for protection at the outer side. Based on similar experiment, the damage that very easily causes optic fibre strain sensor is inefficacy because the direct striking effect of junk model is on the pipe cable model upper surface, the utility model discloses a strain of lower surface utilizes upper and lower surface elastic deformation to be similar the same, but the opposite characteristics of numerical value, the strain numerical value of back-push upper surface.
Because miniature pressure sensor is comparatively firm, not fragile, be fit for instantaneous measurement, the utility model discloses with miniature pressure sensor setting in the upper end of pipe cable model pipe wall, adopt embedded design, make sensor surface and pipe wall surface keep equal, the data line is passed by intraductal to draw forth from the pipe end, connect the synchronous ware, as shown in fig. 1a and fig. 2 b. The micro pressure sensors are arranged in the horizontal axial direction of the umbilical model in the same way as the optical fiber strain sensors, as shown in the U position in fig. 1 a.
The striking experiment go on in the ripples basin, can simulate the hydrodynamic force condition in port region simultaneously, considered the influence of wave, rivers to the object whereabouts. The middle section of the wave flow water tank is provided with a model soil box which adopts a sinking design, namely the surface elevation of the model soil box is equal to the bottoms of the wave flow water tanks at two sides, and the wave flow water tank and the model soil box are both made of transparent glass, so that an external camera can shoot the falling process of the falling object model, and especially the instant motion before the impact is captured. Meanwhile, the transparent side wall of the model soil box can also measure the depth of the falling object model falling into the seabed and capture the deformation process of the soil body.
The utility model discloses be equipped with a guide rail along going up of model basin both sides limit wall, span and install a horizontal sliding platform on the guide rail, by its horizontal motion on the guide rail of driving motor control, simulate different boats and ships running state through the speed of setting for horizontal sliding platform. The utility model discloses still be provided with electromagnetic adsorption device bottom horizontal sliding platform, utilize the electromagnetic technology to realize the control of throwing to the object, utilize electromagnetic adsorption device to adsorb the junk model and carry out horizontal initial motion promptly, when the experiment begins, horizontal sliding platform begins from static acceleration in a certain position department that is located the pipe cable model upper reaches, when having a certain speed and reaching a certain position, electromagnetic adsorption device cuts off the power supply, junk model and horizontal sliding platform separation, make the junk model under the state that has certain level initial velocity, do the motion of freely falling body, this process can realize accurate control by the computer, calculate the position that the object was thrown out according to the motion formula of freely falling body that has initial velocity, make its seabed of hitting the pipe cable top just, as shown in figure 2a and figure 2 b.
The experiment for simulating the impact effect of the falling object on the buried pipe cable is carried out by the following method:
step S1: laying a soil sample with a certain thickness at the bottom of the model soil box to simulate a foundation, compacting the soil sample, and forming a foundation soil body after the drainage consolidation of the soil sample becomes compact;
arranging the umbilical model on the foundation with the micro pressure sensor directly above, as shown in the orientation of fig. 1 a;
covering a plurality of layers of soil layer materials with different colors on a designed pipe cable to form a covering layer, distinguishing the soil layer materials covered by each layer by using different colors, ensuring the uniform thickness of each layer, and performing secondary drainage consolidation compaction;
step S2: arranging a high-speed camera part outside the wave current water tank and perpendicular to the side wall of the glass, wherein the high-speed camera part is used for recording the whole falling process of an object;
step S3: connecting an optical fiber strain sensor, a micro pressure sensor and a high-speed camera outside a water tank on the pipe cable model with a synchronizer and connecting the synchronizer with a control host;
pulling the horizontal sliding platform to a position with a certain distance from the upstream of the pipe cable, electrifying the electromagnet, hanging the falling object model on the electromagnet, and connecting the horizontal sliding platform and the electromagnet switch with the control host;
step S4: injecting water into the water tank until the designed water depth is reached, generating waves and water flow in the water tank, and simulating real natural hydrodynamic conditions;
step S5: controlling the movement speed of the horizontal sliding platform through the host computer, and simultaneously controlling the opening of each sensor by using the synchronizer to enable the sensors to enter a working state;
when the horizontal sliding platform moves to a preset position, the power supply of the electromagnetic adsorption device is disconnected through the control host machine, so that an object falls at a certain horizontal speed and just hits the surface of a soil layer above the pipe cable model, and each sensor synchronously records data of each sensor;
step S6: and (5) carrying out later-stage experimental data processing. Analyzing the deformation state of the pipe cable model for the optical fiber strain sensor based on a modal analysis method; directly measuring the impact force of the falling object through the data of the miniature pressure sensor; and analyzing the high-speed camera video by using an image processing method to obtain the speed and the soil penetration depth of the falling object in the process of impacting the seabed by the falling object. In addition, each layer of the upper soil body of the pipe cable model is in different colors, so that the final deformation condition of the upper soil layer can be analyzed conveniently through observation of the soil layer section.
The utility model discloses the submarine buried pipe cable model of normal water adopts optic fibre strain transducer to measure by the impact deformation process, for traditional acceleration sensor and resistance strain gauge etc. optic fibre strain transducer has the size little, and the diameter only has 0.5mm, and signal sensitivity is high, and the collection frequency can highly reach 5000hz, and the precision is high, and the interference killing feature is strong, can not produce great advantages such as extra influence to the mechanical properties of structure, is fit for the high-speed instantaneous test of junk striking pipe cable.
The utility model discloses utilize miniature pressure sensor to measure the effort of junk to the umbilical striking in-process, because traditional force transducer volume is great, sensitivity is not enough, does not carry out direct measurement's case to the junk impact, the utility model discloses a miniature pressure sensor, the size is diameter 6mm, length 16mm, and the size is little, and embedded settling is in umbilical model pipe wall upper end, only exposes the pipeline surface with the probe, can not influence the external dimension and the structural strength of umbilical, and the data line is passed by intraductal to be drawn forth by the pipe end.
Because the striking of junk to the buried pipe cable in the soil layer is process in the twinkling of an eye, the utility model discloses well measuring content includes that local strain, impact force, junk speed and the soil body of pipe cable model warp. If these measuring instruments operation control one by one, hardly in time catch whole impact process, also can't be linked with each factor among the impact process in addition to the mechanical process of analysis junk striking tube coupling, the utility model discloses a synchronous ware will meet an emergency measurement, impact force measurement, junk speed measurement and soil body measuring instrument utilize the synchronous ware to control, realize the synchronous measurement and the record of each physical parameter, be favorable to revealing and the analysis of atress process and tube coupling damage mechanism.
The tradition is striking pipe cable top seabed surface to the simulation of boats and ships junk after the object is static to fall, because boats and ships are in motion, consequently can't simulate the level that the object had when falling in the traditional experiment and just fast, the utility model relates to a horizontal motion of a set of horizontal sliding platform in order to simulate boats and ships is that the junk is thrown under the condition that has certain level and just fast, and the motion state of simulation object whereabouts that can be more accurate adopts electromagnetic adsorption device to realize the accuracy of junk simultaneously, throws the process fast.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention. The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An experimental device for simulating impact effect of falling objects on a submerged pipe cable is characterized by comprising a simulation water tank and soil box system, a ship movement and falling object throwing system, a pipe cable model and measuring system, a control host and a synchronizer, wherein the control host and the synchronizer are arranged outside the simulation water tank,
simulation basin and soil box system includes: the device comprises a wave flow water tank, a model soil box, a water body, a foundation soil body and a covering layer, and is used for simulating external hydrodynamic force conditions, a seabed foundation and the covering layer, wherein the foundation soil body is laid at the bottom of the model soil box, a pipe cable model is placed and then covered by the covering layer, the model soil box is designed at the middle section of the bottom of the wave flow water tank in a sinking mode, and the surface elevation is equal to the bottoms of the wave flow water tanks at two sides;
the device is put in ship motion and electromagnetism junk throwing includes: the device comprises a guide rail, a horizontal sliding platform, a driving motor, an electromagnetic adsorption device and a falling object model, wherein the guide rail is used for simulating the movement of a ship and the throwing process of an object;
the umbilical model and measurement system includes: the device comprises an umbilical model, an optical fiber strain sensor, a micro pressure sensor and a high-speed camera which is arranged outside a water tank and perpendicular to the side wall of glass and used for measuring falling object movement and deformation and stress of the umbilical;
the synchronizer is connected with the optical fiber strain sensor, the miniature pressure sensor and the high-speed camera to perform synchronous control, and the control host is connected with and controls the synchronizer, the horizontal sliding platform and the electromagnetic falling object throwing device.
2. The experimental device for simulating the impact effect of the submerged pipeline cable on the falling objects according to claim 1, wherein the material of the pipeline cable model is steel or aluminum or PE and PVC; and the interior of the pipe cable model is filled with a balance weight.
3. The experimental device for simulating the impact effect of the falling objects on the submerged pipeline cable according to claim 1, wherein an optical fiber strain sensor array is respectively arranged at the lower end and both side ends of the circumferential surface of the pipeline cable model, and a plurality of optical fiber strain sensors are arranged at intervals in the axial direction of the surface of the pipeline cable model in each optical fiber strain sensor array.
4. The experimental facility for simulating the impact effect of a falling object on a buried pipeline cable according to claim 1, wherein a heat-shrinkable sleeve is used for packaging and protecting the outside of the optical fiber strain sensor array.
5. The experimental device for simulating the impact effect of the falling objects on the submerged pipeline according to claim 1, wherein the miniature pressure sensor is arranged at the upper end of the annular pipe wall of the pipeline model, and the embedded design is adopted, so that the probe of the sensor is flush with the surface of the pipe wall.
6. The experimental device for simulating the impact effect of the submerged pipeline cable on the falling objects as claimed in claim 1, wherein the model soil box is disposed at the middle section of the wave water trough, and is designed to be sunk so that the surface elevation of the model soil box is equal to the bottom of the wave water trough on both sides, and the wave water trough and the model soil box are made of transparent glass.
7. The experimental device for simulating the impact effect of the submerged pipeline cable on the falling objects as claimed in claim 1, wherein the guide rails are arranged on the side walls of the model water tank, the horizontal sliding platform is installed across the guide rails, and the driving motor controls the horizontal movement of the horizontal sliding platform on the guide rails.
8. The experimental device for simulating the impact effect of the falling objects on the submerged pipeline cable according to claim 1, wherein the electromagnetic adsorption device is installed at the bottom of the horizontal sliding platform to adsorb the falling object model and move horizontally, and when the horizontal sliding platform is accelerated from a static state and reaches a preset position, the electromagnetic adsorption device is powered off, and the falling object model is thrown off.
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| CN201922004259.4U CN211718006U (en) | 2019-11-19 | 2019-11-19 | Experimental device for simulating impact effect of falling objects on submerged pipeline cable |
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| CN201922004259.4U CN211718006U (en) | 2019-11-19 | 2019-11-19 | Experimental device for simulating impact effect of falling objects on submerged pipeline cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987670A (en) * | 2019-11-19 | 2020-04-10 | 天津大学 | Experimental device and method for simulating impact effect of falling objects on submerged pipeline cable |
| CN116306084A (en) * | 2023-01-06 | 2023-06-23 | 天津大学 | Numerical method for simulating impact protection of seabed gas pipeline |
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2019
- 2019-11-19 CN CN201922004259.4U patent/CN211718006U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987670A (en) * | 2019-11-19 | 2020-04-10 | 天津大学 | Experimental device and method for simulating impact effect of falling objects on submerged pipeline cable |
| CN116306084A (en) * | 2023-01-06 | 2023-06-23 | 天津大学 | Numerical method for simulating impact protection of seabed gas pipeline |
| CN116306084B (en) * | 2023-01-06 | 2023-10-27 | 天津大学 | Numerical method for simulating impact protection of seabed gas pipeline |
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