CN112185233B - Submarine cable burial depth evaluation device and evaluation method thereof - Google Patents
Submarine cable burial depth evaluation device and evaluation method thereof Download PDFInfo
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Abstract
The invention relates to a submarine cable buried depth evaluation device and a submarine cable buried depth evaluation method, which belong to the technical field of submarine cable laying, and aim at solving the problem that submarine cable burying still can not effectively avoid submarine cable anchor damage accidents, the technical scheme is as follows: the utility model provides a submarine cable burial depth evaluation device, includes experimental sandbox, support frame and slide bracket, and the module is thrown to the altitude mixture control on the slide bracket includes spacing platform and model ship anchor, and spacing platform is used for spacing and release model ship anchor for model ship anchor can vertically fall into experimental sandbox under different heights, in order to obtain the penetration depth of model ship anchor, and provides the assessment method who uses this evaluation device. The evaluation device is simple and convenient to build, can be suitable for various substrates and various ship anchors, and is good in applicability; the method for evaluating the submarine cable buried depth is used for evaluating the penetration depth of the ship anchor and confirming the submarine cable buried depth requirement, and the evaluation process does not involve a plurality of calculation formulas and is simple and easy to implement.
Description
Technical Field
The invention belongs to the technical field of submarine cable laying, and particularly relates to a submarine cable burial depth evaluation device and a submarine cable burial depth evaluation method.
Background
With the large number of applications of submarine cables, the damage suffered by the submarine cables is more and more frequent. In the history of submarine cable damage, the damage caused by human factors accounts for 75% of the total damage of submarine cables, wherein the anchor damage accounts for one third of the total damage of the submarine cables caused by human factors. Submarine cable burying treatment is the most economical and effective method for protecting submarine cables at present. Although the submarine cable is buried in the seabed, the submarine cable anchoring damage caused by the anchoring and hooking of a ship also exists, and a submarine cable anchoring damage evaluation device is developed, so that the penetration depth of the ship anchor in the seabed can be effectively evaluated, the shallowest depth is provided for burying the submarine cable, and the submarine cable anchoring damage accident is prevented.
Disclosure of Invention
Aiming at the problem that submarine cable anchoring accidents cannot be effectively avoided even when submarine cables are buried, the invention provides a submarine cable buried depth assessment device and an assessment method thereof.
The technical scheme adopted by the invention is as follows: the utility model provides a submarine cable buried depth evaluation device, includes the experimental sandbox of built-in experimental bottom material, erects the support frame on experimental sandbox and is equipped with the slide bracket of altitude mixture control year module, the slide bracket level sets up to sliding on the support frame to drive altitude mixture control year module along support frame horizontal migration, altitude mixture control year module includes height-adjustable's spacing platform and model ship anchor, and spacing platform is used for spacingly or releases the model ship anchor for the model ship anchor can be vertical under the not co-altitude fall into in the experimental bottom material, in order to obtain the penetration depth of model ship anchor.
The height adjusting and throwing module can move horizontally to measure the receding of the penetration depth of the model ship anchor, the limiting platform can adjust the height position of the model ship anchor, so that the model ship anchor can fall at different heights, the test substrate can select a medium with the parameter consistent with the sea area of actual operation, and the evaluation device can perform proportional scaling test according to the typical ship anchor condition of the operation sea area and the parameter condition of the operation substrate so as to convert the model ship anchor into the penetration depth of the actual ship anchor through scaling and confirm the minimum requirement of the submarine cable burial depth, thereby reducing the probability that the ship anchor damages the submarine cable; the evaluation device is simple and convenient to build, can be suitable for various substrates and various ship anchors, and has good applicability.
Further, a reel and a speed measuring module for measuring the rotating speed of the reel are further arranged on the sliding platform, the model ship anchor is linked with the speed measuring module through a connecting rope wound on the reel, when the model ship anchor is released by the limiting platform, the model ship anchor falls under gravity, and the speed measuring module obtains the falling speed of the model ship anchor by measuring the rotating speed of the reel. The speed of the model ship anchor when falling into experimental substrate can be measured to the module that tests the speed to spacing platform passes through the position of speed adjustment model ship anchor.
Further, the speed measuring module comprises an encoding disc and a speed measuring sensor for measuring the speed of the encoding disc, the encoding disc and the reel are arranged on the output shaft of the stepping motor and rotate synchronously, so that the speed measuring sensor obtains the speed of the reel by measuring the speed of the encoding disc; be equipped with an one-way bearing between output shaft and the reel, step motor drive output shaft pivoted direction with reel wire winding direction unanimity, with one-way bearing's working direction opposite to step motor one-way drive reel makes and connects the rope winding on the reel, conveniently retrieves and connects the rope. The reel can rotate forward and backward, when the model ship anchor can fall under the self gravity, the one-way bearing works, at the moment, the reel rotates, and the output shaft does not move; when the stepping motor drives the output shaft to rotate, the one-way bearing does not work, the whole one-way bearing is driven by the output shaft and drives the reel and the coding disc to synchronously rotate so as to facilitate the connection rope to be wound on the reel; the influence of the motor torque on the wire winding wheel when the model ship anchor falls is effectively reduced by the arrangement.
Furthermore, the connecting rope is connected with the model ship anchor through a connecting chain with a limiting hole, the limiting platform is used for limiting the model ship anchor through an air cylinder with a telescopic end, when the telescopic end penetrates through the limiting hole, the limiting platform limits the model ship anchor, and when the telescopic end leaves the limiting hole, the limiting platform releases the model ship anchor. The model ship anchor is released manually, so that the model ship anchor has an initial speed and a horizontal speed, and the condition can be avoided by using the air cylinder, and the inaccurate measuring result is avoided.
Furthermore, the height adjusting load rejection module also comprises a support frame, a size rod with scales is arranged on the support frame, a scale pointer is arranged on the limiting platform, and the scale pointer is arranged close to the size rod so as to mark the position of the limiting platform; a fixed pulley is arranged at the top of the supporting frame, and the connecting rope is sleeved on the fixed pulley so as to conveniently hoist and release the model ship anchor.
Furthermore, a vertical sliding groove is formed in the supporting frame, and a fastener penetrates through the size rod to be limited in the sliding groove, so that the size rod is adjustable in position up and down. This arrangement facilitates the zero point of the size rod to be in the same plane as the upper surface of the test substrate.
Further, be equipped with on the support frame by driving motor driven hold-in range and with the parallel two spinal branch poles of hold-in range, sliding platform and hold-in range fixed connection are with synchronous translation, and sliding platform's both ends overlap respectively on two spinal branch poles for sliding platform steady movement.
The evaluation method using the submarine cable burial depth evaluation device comprises the following steps:
s1, carrying out ship analysis on a submarine cable laying operation sea area to obtain a typical ship condition, analyzing a typical ship anchor type according to the obtained typical ship condition, and obtaining ship anchor parameters of the submarine cable laying operation sea area;
s2, performing route exploration in a submarine cable laying operation area to obtain seabed sediment soil parameters and the hydrological condition of the operation sea area; acquiring the maximum speed of the ship anchor when the ship anchor touches the bottom according to the ship anchor parameters and the sea hydrological condition;
s3, determining a scaling ratio, scaling the soil parameters of the submarine substrate, the ship anchor parameters and the maximum speed of the ship anchor when the ship anchor touches the bottom according to the scaling ratio, and manufacturing a model ship anchor and a test substrate in the submarine cable burial depth evaluation device;
s4, acquiring the simulated penetration depth of the model ship anchor in the model sandbox by adopting a submarine cable buried depth evaluation device;
and S5, calculating the penetration depth of the ship anchor according to the scaling and the simulated penetration depth of the S4, and obtaining the lowest requirement of the submarine cable burying depth.
The method provides a method for evaluating the penetration depth of the ship anchor by using a submarine cable burial depth evaluation device, the evaluation device performs proportional scaling to perform test simulation according to the typical ship anchor condition of an operation sea area and the operation substrate parameter condition, the test result is converted into the ship anchor penetration depth according to the scaling ratio, the submarine cable burial depth requirement is confirmed according to the test result, the evaluation process does not involve various calculation formulas, and the evaluation process is simple and easy to implement.
Further, in S2, the specific formula of the maximum speed when the ship anchor touches the bottom is as follows:
in the formula: g is the acceleration of gravity; rho water Is the density of seawater; v anchor Is the volume of the ship anchor; a. The F The projected area of the ship anchor in the stress direction is shown; c d Is the drag coefficient.
Further, the operation steps of the submarine cable burial depth evaluation device in S4 are as follows:
s4.1, adjusting test substrate parameters in the model sandbox to meet the scaled seabed substrate soil parameters, hoisting the model ship anchor to a certain height, and enabling the model ship anchor to be over against the test substrate in the model sandbox;
s4.2, adopting a speed measuring module to measure the speed of the model ship anchor, and adjusting the height of the model ship anchor until the speed of the model ship anchor falling into the test substrate is consistent with the maximum speed of the scaled ship anchor when contacting the bottom;
s4.3, turning on the stepping motor to enable the reel to rotate so as to recover the connecting rope, adjusting the position of the sliding platform and exposing the anchor dropping position;
and S4.4, measuring the simulated penetration depth of the model ship anchor at the anchor falling position.
And evaluating the penetration depth of the ship anchor at the maximum penetration speed of the ship anchor according to the scaling, wherein when the buried depth of the submarine cable is greater than the maximum penetration depth of the ship anchor, the ship anchor cannot touch the submarine cable, and the ship anchor cannot damage the submarine cable.
The invention has the following beneficial effects: the evaluation device can carry out scaling test according to the typical ship anchor condition of the operation sea area and the operation substrate parameter condition so as to convert the scaling into the penetration depth of the actual ship anchor and confirm the minimum requirement of the submarine cable burial depth, thereby reducing the probability that the ship anchor damages the submarine cable; the evaluation device is simple and convenient to build, can be suitable for various substrates and various ship anchors, and has better applicability; the method for evaluating the submarine cable buried depth is used for evaluating the penetration depth of the ship anchor and confirming the submarine cable buried depth requirement, and the evaluation process does not involve a plurality of calculation formulas and is simple and easy to implement.
Drawings
FIG. 1 is a schematic structural diagram of a submarine cable burial depth evaluation device;
FIG. 2 is a schematic structural view of the submarine cable burial depth evaluation device in another direction;
FIG. 3 is an enlarged structural view of the area A in FIG. 1;
in the figure: 1-test sandbox; 2-a support frame; 21-a drive motor; 211-synchronous belt; 22-a strut; 3-a sliding platform; 31-a reel; 32-a code wheel; 33-a speed measuring sensor; 4-height adjustment load rejection module; 41-a limiting platform; 411-scale pointer; 42-model boat anchor; 43-a support frame; 431-size rod; 44-a fixed pulley; 5-connecting ropes; 51-a connecting chain; 511-a limiting hole; 6-a step motor; 61-an output shaft; 62-one-way bearing; 7-a cylinder; 71-telescoping end.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
The submarine cable burial depth evaluation device of the embodiment, as shown in fig. 1 to 3, comprises a test sandbox 1 with a built-in test substrate, a support frame 2 erected on the test sandbox 1, and a sliding platform 3 provided with a height adjusting load rejection module 4, wherein the sliding platform 3 is horizontally and slidably arranged on the support frame 2 so as to drive the height adjusting load rejection module 4 to horizontally move along the support frame 2, the height adjusting load rejection module 4 comprises a height adjustable limiting platform 41 and a model ship anchor 42, and the limiting platform 41 is used for limiting or releasing the model ship anchor 42, so that the model ship anchor 42 can vertically fall into the test substrate at different heights to obtain the penetration depth of the model ship anchor 42.
The height adjusting load rejection module 4 can move horizontally to measure the penetration depth of the model ship anchor 42 for abdication, the limiting platform 41 can adjust the height position of the model ship anchor 42 to enable the model ship anchor 42 to fall at different heights, and the test substrate can select a medium with the same parameter with the sea area of actual operation; the evaluation device is simple and convenient to build, can be suitable for various substrates and various ship anchors, and has good applicability.
The sliding platform 3 is also provided with a reel 31 and a speed measuring module for measuring the rotating speed of the reel 31, the model ship anchor 42 is linked with the speed measuring module through a connecting rope 5 wound on the reel 31, when the model ship anchor 42 is released by the limiting platform 41, the model ship anchor 42 falls under gravity, and the speed measuring module obtains the falling speed of the model ship anchor 42 by measuring the rotating speed of the reel 31. The speed measuring module can measure the speed of the model ship anchor 42 when falling into the test substrate, so that the position of the limiting platform 41 is adjusted through the speed of the model ship anchor 42.
The speed measuring module comprises an encoding disc 32 and a speed measuring sensor 33 for measuring the speed of the encoding disc 32, the encoding disc 32 and the reel 31 are arranged on an output shaft 61 of the stepping motor 6 and synchronously rotate, so that the speed measuring sensor 33 obtains the speed of the reel 31 by measuring the speed of the encoding disc 32; a one-way bearing 62 is arranged between the output shaft 61 and the reel 31, and the direction of the stepping motor 6 for driving the output shaft 61 to rotate is consistent with the winding direction of the reel 31 and opposite to the working direction of the one-way bearing 62, so that the stepping motor 6 can drive the reel 31 in one way to wind the connecting rope 5 on the reel 31, and the connecting rope 5 can be conveniently recovered. The reel 31 can rotate in forward and reverse directions, when the model ship anchor 42 falls under the self gravity, the one-way bearing 62 works, at the moment, the reel 31 rotates, and the output shaft 61 does not move; when the stepping motor 6 drives the output shaft 61 to rotate, the one-way bearing 62 does not work, the whole is driven by the output shaft 61, and drives the reel 31 and the code disc 32 to synchronously rotate, so that the connecting rope 5 is wound on the reel 31; this arrangement effectively reduces the influence of the motor torque on the wire winding wheel 31 when the model ship anchor 42 is dropped.
The connecting rope 5 is connected with the model ship anchor 42 through a connecting chain 51 with a limiting hole 511, the limiting platform 41 limits the model ship anchor 42 through an air cylinder 7 with a telescopic end 71, when the telescopic end 71 penetrates through the limiting hole 511, the limiting platform 41 limits the model ship anchor 42, and when the telescopic end 71 leaves the limiting hole 511, the limiting platform 41 releases the model ship anchor 42. The manual release of the model ship anchor 42 tends to cause the model ship anchor 42 to have an initial velocity and a horizontal velocity, which is avoided by using the cylinder 7, thereby avoiding inaccurate measurement results.
The height adjusting load rejection module 4 further comprises a supporting frame 43, a size rod 431 with scales is arranged on the supporting frame 43, a scale pointer 411 is arranged on the limiting platform 41, and the scale pointer 411 is arranged close to the size rod 431 so as to mark the position of the limiting platform 41; the top of the supporting frame 43 is provided with a fixed pulley 44, and the connecting rope 5 is sleeved on the fixed pulley 44 to facilitate hoisting and releasing the model ship anchor 42.
The supporting frame 43 is provided with a vertical sliding groove, and a fastener passes through the dimension rod 431 and is limited in the sliding groove, so that the dimension rod 431 can be adjusted in the vertical position. This arrangement facilitates the zero point of the size bar 431 to be in the same plane as the upper surface of the test substrate.
Be equipped with on support frame 2 by driving motor 21 driven hold-in range 211 and two spinal branch vaulting poles 22 parallel with hold-in range 211, sliding platform 3 and hold-in range 211 fixed connection are put on two spinal branch vaulting poles 22 with synchronous translation, sliding platform 3's both ends overlap respectively for sliding platform 3 steady movement.
An evaluation method using a submarine cable burial depth evaluation device, comprising:
s1, carrying out ship analysis on a sea area for laying operation of a sea cable to obtain a typical ship condition, analyzing a typical ship anchor type according to the obtained typical ship condition, and obtaining ship anchor parameters of the sea area for laying operation of the sea cable;
s2, performing route exploration in a submarine cable laying operation area to obtain seabed sediment soil parameters and the hydrological condition of the operation sea area; acquiring the maximum speed of the ship anchor when the ship anchor touches the bottom according to the parameters of the ship anchor and the hydrological condition of the sea area;
the specific formula of the maximum speed when the ship anchor touches the bottom is as follows:
in the formula: g is gravity acceleration; rho water Is the density of the seawater; v anchor Is the volume of the ship anchor; a. The F The projected area of the ship anchor in the stress direction is shown; c d Is a drag coefficient;
s3, determining a scaling ratio, scaling the soil parameters of the submarine substrate, the ship anchor parameters and the maximum speed of the ship anchor when the ship anchor touches the bottom according to the scaling ratio, and manufacturing a model ship anchor 42 and a test substrate in the submarine cable burial depth evaluation device; the manufacturing material of the model ship anchor 42 is consistent with that of the actual ship anchor, the appearance size of the model ship anchor is manufactured according to the scaling ratio with that of the actual ship anchor, kaolin is selected as a test substrate, and a triaxial shear test is adopted to determine substrate parameters;
designing a scaling according to the acquired regional soil parameters, the acquired ship anchor parameters and the ship anchor bottoming speed, and comprising the following specific processes:
in order to make the evaluation device correctly reflect the penetration depth of the prototype anchor, the model of the burial depth evaluation device needs to be similar in power besides geometric parameters, and the model needs to meet the requirement of similar main acting force during design. The design of the test adopts the Buddha rude similarity criterion to carry out the design of the similar model test.
In the formula: v is the flow rate; h is the water depth; g is the acceleration of gravity.
The Buddha's rule requires that the submarine cable buried depth evaluation device is equal to the prototype's Buddha's number, i.e. (F) r ) m ＝F r ，(F r ) m And F r Representing the physical quantities of the model and prototype, respectively.
Speed scale
λ is geometric scale.
The anchor weight satisfies the following formula:
the contact area satisfies the following formula:
the soil strength satisfies the following formula:
λ su ＝λv (4)
the scaling is shown in the following table:
s4, acquiring the simulated penetration depth of the model ship anchor 42 in the test sandbox by adopting a submarine cable buried depth evaluation device;
the submarine cable burial depth evaluation device comprises the following operation steps:
s4.1, adjusting the bottom material parameters in the test sandbox to meet the scaled seabed bottom material soil parameters, adjusting the position of the size rod 431 to enable the zero point position of the size rod 431 and the upper surface of the test bottom material to be in the same plane, rotating the reel 31 to shorten the length of the free end of the connecting rope 5, enabling the limiting platform 41 to drive the model ship anchor 42 to a certain height, and enabling the model ship anchor 42 to be opposite to the test bottom material in the test sandbox; the height of the model ship anchor 42 is the distance between the scale supervision pointer pointed by the scale pointer 411 and the gravity center of the ship anchor;
s4.2, releasing the model ship anchor 42 by the limiting platform 41, measuring the speed of the model ship anchor 42 by a speed measuring module, wherein the diameter of the connecting rope 5 is 1mm, the diameter of the reel 31 is 50mm, the single-layer winding is 8m, and when the model ship anchor 42 falls, the winding diameter of the reel 31 is kept at 52mm and can be converted into the outlet speed, namely the speed of the model ship anchor 42 falling into the test substrate; starting the stepping motor 6 to recover the connecting rope, limiting the model ship anchor 42 by using the air cylinder 7, and adjusting the height of the model ship anchor 42 until the speed of the model ship anchor 42 falling into the test substrate is consistent with the maximum speed of the zoomed ship anchor when touching the bottom;
s4.3, turning on the stepping motor 6 to enable the reel 31 to rotate so as to recover the connecting rope 5, adjusting the position of the sliding platform 3 and exposing the anchor falling position;
s4.4, measuring the simulated penetration depth of the model ship anchor 42 at the anchor-falling position;
and S5, calculating the penetration depth of the ship anchor according to the scaling and the simulated penetration depth of the S4, and obtaining the lowest requirement of the submarine cable burying depth.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art will appreciate that the invention includes, but is not limited to, the accompanying drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the claims.
Claims (8)
1. The submarine cable burial depth evaluation device is characterized by comprising a test sandbox (1) with a built-in test substrate, a support frame (2) erected on the test sandbox (1) and a sliding platform (3) provided with a height adjusting load rejection module (4), wherein the sliding platform (3) is horizontally and slidably arranged on the support frame (2) so as to drive the height adjusting load rejection module (4) to horizontally move along the support frame (2), the height adjusting load rejection module (4) comprises a height-adjustable limiting platform (41) and a model ship anchor (42), and the limiting platform (41) is used for limiting or releasing the model ship anchor (42), so that the model ship anchor (42) can vertically fall into the test substrate at different heights to obtain the penetration depth of the model ship anchor (42);
the sliding platform (3) is also provided with a reel (31) and a speed measuring module for measuring the rotating speed of the reel (31), the model ship anchor (42) is linked with the speed measuring module through a connecting rope (5) wound on the reel (31), the model ship anchor (42) falls under gravity after being released by the limiting platform (41), and the speed measuring module obtains the falling speed of the model ship anchor (42) by measuring the rotating speed of the reel (31);
the speed measuring module comprises an encoding disc (32) and a speed measuring sensor (33) for measuring the speed of the encoding disc (32), the encoding disc (32) and the reel (31) are arranged on an output shaft (61) of the stepping motor (6), and the encoding disc (32) and the reel (31) rotate synchronously, so that the speed measuring sensor (33) obtains the speed of the reel (31) by measuring the speed of the encoding disc (32); a one-way bearing (62) is arranged between the output shaft (61) and the reel (31), the rotating direction of the stepping motor (6) driving the output shaft (61) is consistent with the winding direction of the reel (31) and opposite to the working direction of the one-way bearing (62), so that the stepping motor (6) drives the reel (31) in one way to wind the connecting rope (5) on the reel (31).
2. The submarine cable burial depth evaluation device according to claim 1, wherein the connection rope (5) is connected to the model ship anchor (42) through a connection chain (51) having a restraining hole (511), the restraining platform (41) restrains the model ship anchor (42) through a cylinder (7) having a telescopic end (71), the restraining platform (41) restrains the model ship anchor (42) when the telescopic end (71) passes through the restraining hole (511), and the restraining platform (41) releases the model ship anchor (42) when the telescopic end (71) leaves the restraining hole (511).
3. Submarine cable burial depth evaluation device according to claim 2, wherein the height adjustment ballast module (4) further comprises a support frame (43), a graduated size rod (431) is provided on the support frame (43), a graduated pointer (411) is provided on the limiting platform (41), and the graduated pointer (411) is provided adjacent to the size rod (431) so as to mark the position of the limiting platform (41); the top of the supporting frame (43) is provided with a fixed pulley (44), and the connecting rope (5) is sleeved on the fixed pulley (44).
4. Submarine cable burial depth evaluation device according to claim 3, wherein the support frame (43) is provided with vertical sliding grooves, and a fastener is limited in the sliding grooves through the dimension bar (431) so that the dimension bar (431) can be adjusted in up-and-down positions.
5. The submarine cable burial depth evaluation device according to claim 1, wherein the support frame (2) is provided with a synchronous belt (211) driven by a driving motor (21) and two support rods (22) parallel to the synchronous belt (211), the sliding platform (3) is fixedly connected with the synchronous belt (211) to synchronously translate, and two ends of the sliding platform (3) are respectively sleeved on the two support rods (22).
6. An evaluation method using the submarine cable burial depth evaluation device according to any one of claims 1 to 5, comprising:
s1, carrying out ship analysis on a submarine cable laying operation sea area to obtain a typical ship condition, analyzing a typical ship anchor type according to the obtained typical ship condition, and obtaining ship anchor parameters of the submarine cable laying operation sea area;
s2, performing route exploration in a submarine cable laying operation area to obtain seabed sediment soil parameters and the hydrological condition of an operation sea area; acquiring the maximum speed of the ship anchor when the ship anchor touches the bottom according to the ship anchor parameters and the sea hydrological condition;
s3, determining a scaling ratio, scaling the soil parameters of the submarine substrate, the parameters of the ship anchor and the maximum speed of the ship anchor when the ship anchor touches the bottom according to the scaling ratio, and manufacturing a model ship anchor (42) and a test substrate in the submarine cable burial depth evaluation device;
s4, acquiring the simulated penetration depth of the model ship anchor (42) in the model sandbox by adopting a submarine cable buried depth evaluation device;
and S5, calculating the penetration depth of the ship anchor according to the scaling and the simulated penetration depth of the S4, and obtaining the lowest requirement of the submarine cable burying depth.
7. The method according to claim 6, wherein in S2, the specific formula of the maximum speed of the ship anchor at the bottom of the ship anchor is as follows:
in the formula:gis the acceleration of gravity;ρ water is the density of seawater;V anchor is the volume of the ship anchor;A F as a shipThe projection area of the anchor in the force-bearing direction;C d is a drag coefficient;ρ anchor is the ship anchor density.
8. The evaluation method according to claim 7, wherein the operation steps of the submarine cable burial depth evaluation device in S4 are:
s4.1, adjusting test substrate parameters in the model sandbox to meet the scaled seabed substrate soil parameters, hoisting the model ship anchor (42) to a certain height, and enabling the model ship anchor (42) to be over against the test substrate in the model sandbox;
s4.2, a speed measuring module is adopted to measure the speed of the model ship anchor (42), and the height of the model ship anchor (42) is adjusted until the speed of the model ship anchor (42) falling into the test substrate is consistent with the maximum speed of the scaled ship anchor when the model ship anchor touches the bottom;
s4.3, turning on the stepping motor (6), enabling the reel (31) to rotate to recover the connecting rope (5), adjusting the position of the sliding platform (3), and exposing the anchor falling position;
and S4.4, measuring the simulated penetration depth of the model ship anchor (42) at the anchor-falling position.
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| CN114279676B (en) * | 2021-11-23 | 2024-06-07 | 国核电力规划设计研究院有限公司 | Sea state threshold value judging method for strain damage of submarine suspended cable |
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| CN206095833U (en) * | 2016-10-25 | 2017-04-12 | 国网浙江省电力公司舟山供电公司 | Testing system is pounded to submarine cable anchor |
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