Testing device and method for simulating free suspended span working condition of submarine cable

Abstract

The invention relates to the technical field of marine equipment testing, and discloses a test device and method for simulating a free suspended span working condition of a submarine cable, and the device carries out the suspended span end load test of the submarine cable through the mutual cooperation of a static test assembly, a dynamic test assembly, a mobile platform, a seabed simulation assembly and an actuator. A control variable method is adopted to dynamically adjust test conditions such as tensile force, contact length, separation angle and seabed surface environment at two ends of a submarine cable to be tested, and change and rule of end load in a test process are acquired, so that end load information under different working conditions is accurately acquired; the technical problem of how to accurately obtain the end load information of the submarine cable is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine equipment testing, and in particular to a test device and method for simulating a free-spanning working condition of a submarine cable. Background Art

[0002] As the development of land-based wind energy resources gradually reaches saturation, offshore wind power generation is bound to have broad application prospects and develop towards offshore and large-scale development. Submarine cables are used to connect offshore wind farm wind turbine platforms, booster stations, and onshore centralized control centers and other equipment, and undertake the power and communication transmission tasks of the entire wind farm. Submarine cables are easily affected by the marine environment during in-situ operation, causing failures that affect normal operation, especially its local failure under the action of periodic marine environmental loads needs to be paid attention to.

[0003] Under the coupling of wave and current loads, the seabed is very susceptible to erosion, which directly or indirectly affects the topography of the submarine cable laying area, resulting in the exposure and hanging of submarine cables. After the submarine cable is hung, it will be subjected to periodic dynamic marine environmental loads, especially the extreme alternating loads at the end of the span, which will cause the submarine cable to break, fatigue and other failures. At present, the prediction of the load and response at the end of the suspended submarine cable is mainly based on the finite element method. By establishing an overall model of the suspended span section and applying gravity and dynamic marine environmental loads, the stress and strain conditions and local loads at the end of the submarine cable are obtained. However, since the end area of ​​the submarine cable is often in contact with the seabed, there are complex shear and interface contacts. It is difficult to accurately set and simulate boundary conditions using the finite element method, resulting in low credibility of the calculation and analysis results.

[0004] Therefore, conducting experiments to simulate the end area of ​​the submarine cable free-span condition and predicting the end load of the submarine cable are of great engineering significance for the safe operation and maintenance of the submarine cable. Summary of the invention

[0005] The present invention provides a test device and method for simulating the free-span working condition of a submarine cable, which solves the technical problem of how to accurately obtain the end load information of the submarine cable.

[0006] A first aspect of the present invention provides a test device for simulating a free-spanning working condition of a submarine cable, comprising a test platform;

[0007] The test platform is provided with a mobile platform, a static test component and a dynamic test component;

[0008] The submarine cable to be tested is installed on the top of the mobile platform through a seabed simulation component, and the seabed simulation component is used to simulate the seabed surface environment;

[0009] One end of the submarine cable to be tested is connected to the fixed bracket through a first tension sensor assembly, and the other end of the submarine cable to be tested is connected to the actuator through a second tension sensor assembly;

[0010] One end of the actuator away from the submarine cable to be tested is connected to the test platform;

[0011] The static test assembly is connected to the actuator and is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator to simulate a static loading condition;

[0012] The dynamic test assembly is connected to the actuator and is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator to simulate a dynamic loading condition.

[0013] Optionally, the static test assembly includes a support frame;

[0014] The support frame includes a bottom plate and an inclined plate;

[0015] The inclined upper end surface of the inclined plate is connected to the actuator;

[0016] A slide rail is provided on the upper end surface of the bottom plate in the vertical direction;

[0017] One end of the inclined plate is connected to the slide rail, and is used to adjust the inclination angle of the inclined plate to change the force angle of the end of the submarine cable to be tested;

[0018] The other end of the inclined plate is rotatably connected to the upper end surface of the bottom plate;

[0019] The inclined plate, the bottom plate and the slide rail form a triangular structure;

[0020] A first sliding assembly is disposed on the lower end surface of the bottom plate, and the first sliding assembly is disposed with a first brake.

[0021] Optionally, the dynamic test assembly includes a pulley assembly and a hoisting fixing plate;

[0022] The hoisting fixing plate is installed on the top of the test platform;

[0023] The top of the pulley assembly is fixed to the hoisting fixing plate;

[0024] The hoisting fixing plate is connected to a driving device, and the driving device is used to drive the hoisting fixing plate to move in a horizontal direction, adjust the position of the pulley assembly, and change the force angle of the end of the submarine cable to be tested.

[0025] Optionally, the pulley assembly comprises a first pulley body and a second pulley body;

[0026] The first pulley body is rotatably connected to the hoisting fixing plate;

[0027] The second pulley body is externally rotatably connected to a retaining frame, and the retaining frame is fixed with a first traction rope;

[0028] The top of the first traction rope is sleeved on the first pulley body;

[0029] The second pulley body is provided with a second traction rope;

[0030] One end of the second traction rope is connected to the actuator, and the other end of the second traction rope is connected to the submarine cable to be tested.

[0031] Optionally, the seabed simulation assembly comprises a plurality of arc plates with upper ends facing inwardly concave;

[0032] The arc plates are connected in pairs by bolts to form an arc-shaped connecting plate with a submarine cable placement groove on the upper end surface, and the submarine cable placement groove is used to place the submarine cable to be tested;

[0033] The arc-shaped connecting plate is provided with a plurality of pressure sensors;

[0034] The plurality of pressure sensors are arranged in a multi-piece arrangement to test the contact pressure distribution data between the submarine cable to be tested and the simulated seabed;

[0035] A contact plate is laid in the submarine cable placement groove;

[0036] The contact plate is bonded with seabed surface sediments, and the seabed surface sediments are used to simulate the seabed surface environment;

[0037] A displacement sensor is arranged in the submarine cable placement groove, and the displacement sensor is used to measure the displacement between the submarine cable to be tested and the simulated seabed.

[0038] Optionally, a convex connecting piece is provided at one end of the arc plate;

[0039] The other end of the arc plate is provided with a concave connecting piece;

[0040] The convex connecting piece of the arc plate member is fixedly connected to the concave connecting piece of another arc plate member by means of bolts.

[0041] Optionally, the mobile platform comprises a mobile plate;

[0042] A steel beam composed of a plurality of steel beam frames is arranged in the vertical direction on the upper end surface of the movable plate, and the steel beam is used to adjust the horizontal height of the submarine cable to be tested installed on the top of the movable platform;

[0043] A second sliding assembly is disposed on the lower end surface of the moving plate, and the second sliding assembly is disposed with a second brake.

[0044] Optionally, the first tension sensing assembly includes a first connecting member and a first tension sensor;

[0045] The second tension sensor assembly includes a second connecting member and a second tension sensor;

[0046] One end of the submarine cable to be tested is connected to the first tension sensor, and is connected to the fixing bracket through the first connecting member;

[0047] A first tension sensor is used to measure the tension data of the end connected to the fixed bracket when the submarine cable to be tested is subjected to a tensile load;

[0048] The other end of the submarine cable to be tested is connected to the second tension sensor, and is connected to the actuator through the second connecting member;

[0049] The second tension sensor is used to measure the tension data of the end connected to the actuator when the submarine cable to be tested is subjected to a tensile load.

[0050] Optionally, the fixing bracket is a right triangle structure;

[0051] The first right-angled side of the fixed bracket is fixedly connected to the upper end surface of the test platform;

[0052] The second right-angled side of the fixing bracket is connected to the first tension sensor assembly;

[0053] A cross bar is arranged inside the fixing bracket, and the cross bar is used to change the transmission path of the force acting on the fixing bracket.

[0054] A second aspect of the present invention provides a test method applied to the test device for simulating the free spanning working condition of a submarine cable, comprising:

[0055] Respond to test requests for submarine cables to be tested;

[0056] When the test request is to perform a static test, the actuator is used to stretch the submarine cable to be tested. In conjunction with the fixed bracket, mobile platform and static test assembly, the test controls the tensile tension of the submarine cable to be tested by controlling the actuator to obtain the static end load information of the submarine cable to be tested under different static test conditions;

[0057] When the test request is to perform a dynamic test, the actuator is used to stretch the submarine cable to be tested. In conjunction with the fixed bracket, mobile platform and dynamic test assembly, the test controls the tensile tension of the submarine cable to be tested by controlling the actuator to obtain the dynamic end load information of the submarine cable to be tested under different dynamic test conditions.

[0058] It can be seen from the above technical solutions that the present invention has the following advantages:

[0059] The present invention utilizes static test components, dynamic test components, mobile platforms, seabed simulation components and actuators to cooperate with each other to carry out the end load test of the suspended span of the submarine cable, and adopts the control variable method to dynamically adjust the tension size, contact length, separation angle and seabed surface environment and other test conditions at both ends of the submarine cable to be tested, so as to obtain the change and law of the end load size during the test, and then accurately obtain the end load information under different working conditions, thereby solving the technical problem of how to accurately obtain the end load information of the submarine cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0061] Figure 1 It is a structural schematic diagram of a load variation test of a suspended span end of a submarine cable to be tested under a static load according to an embodiment of the present invention;

[0062] Figure 2 It is a structural schematic diagram of a load variation test of a suspended span end of a submarine cable to be tested under a dynamic load according to an embodiment of the present invention;

[0063] Figure 3 A sensor arrangement diagram of an embodiment of the present invention;

[0064] Figure 4 This is a schematic diagram of the structure of an arc-shaped connecting plate according to an embodiment of the present invention;

[0065] Figure 5 The load force diagram of the end of the suspended span of the submarine cable to be tested according to an embodiment of the present invention;

[0066] Figure 6 This is a force analysis diagram of the contact section of the end of the submarine cable to be tested according to an embodiment of the present invention;

[0067] Figure 7 A schematic diagram of factors affecting the load on the end of a suspended span of a submarine cable to be tested according to an embodiment of the present invention;

[0068] Figure 8 A schematic diagram of the structure of a support frame used in an actuator according to an embodiment of the present invention;

[0069] Fig. 9 A flowchart of the steps of a test method applied to a test device for simulating a free-spanning condition of a submarine cable according to an embodiment of the present invention;

[0070] The meanings of the reference numerals are as follows:

[0071] 1. Fixed bracket; 2. First connecting piece; 3. Arc connecting plate; 4. Mobile platform; 5. Pressure sensor; 6. Actuator; 7. Support frame; 8. Test platform; 9. Sliding assembly; 10. Lifting fixed plate; 11. Contact plate; 12. Slide rail; 13. Bottom plate; 14. Second connecting piece. DETAILED DESCRIPTION

[0072] The embodiment of the present invention provides a test device and method for simulating the free-span working condition of a submarine cable, which are used to solve the technical problem of how to accurately obtain the end load information of the submarine cable.

[0073] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] See also Figure 1-Figure 8 , a test device for simulating the free-spanning working condition of a submarine cable provided by the present invention comprises a test platform 8;

[0075] The test platform 8 is provided with a mobile platform 4, a static test component and a dynamic test component;

[0076] The submarine cable to be tested is installed on the top of the mobile platform 4 through a seabed simulation component, and the seabed simulation component is used to simulate the seabed surface environment;

[0077] One end of the submarine cable to be tested is connected to the fixed bracket 1 through the first tension sensor assembly, and the other end of the submarine cable to be tested is connected to the actuator 6 through the second tension sensor assembly;

[0078] The end of the actuator 6 away from the submarine cable to be tested is connected to the test platform 8;

[0079] The static test assembly is connected to the actuator 6 and is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator 6 to simulate the static loading condition;

[0080] The dynamic test assembly is connected to the actuator 6 and is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator 6 to simulate the dynamic loading condition.

[0081] It should be noted that in submarine pipeline projects, when the seabed terrain is undulating or due to scouring and other reasons, some sections of the submarine cable are not supported on the seabed, but are suspended a certain distance above the seabed. This state is called free spanning, and the free spanning condition of the submarine cable includes various loads borne by the suspended submarine cable (such as water flow force, wave force, self-gravity, etc.). The submarine cable to be tested refers to the suspended submarine cable to be tested.

[0082] In the embodiment of the present invention, the test platform 8 is a rectangular structure, and the test platform 8 is used to provide a horizontal test site, fix various test components and the submarine cable to be tested, and the submarine cable to be tested is installed on the top of the mobile platform 4 through the seabed simulation component. The mobile platform 4 is arranged below the submarine cable to be tested, and is used to adjust the detachment angle of the submarine cable to be tested by horizontally moving on the test platform 8. The submarine cable to be tested is placed in the seabed simulation component, and the seabed simulation component is used to simulate the seabed surface environment. One end of the submarine cable to be tested is connected to the fixed bracket 1 through the first tension sensor component, and the other end of the submarine cable to be tested is connected to the actuator 6 through the second tension sensor component. The two ends of the submarine cable are respectively detachably connected with a first tension sensing component and a second tension sensing component. The actuator 6 is driven by an oil pump and is used to apply tension to the submarine cable to be tested, control the tensile tension of the submarine cable, and simulate the load borne by the submarine cable to be tested. The end of the actuator 6 away from the submarine cable to be tested is hinged to the test platform 8. The static test component is connected to the actuator 6 and is used to adjust the end force angle of the submarine cable to be tested connected to the actuator 6 when performing a static test to simulate a static load phenomenon. The dynamic test component is connected to the actuator 6 and is used to adjust the end force angle of the submarine cable to be tested connected to the actuator 6 when performing a dynamic test to simulate a dynamic load phenomenon.

[0083] The present invention utilizes a static test component, a dynamic test component, a mobile platform 4, a seabed simulation component and an actuator 6 to cooperate with each other to carry out a submarine cable span end load test, and adopts a control variable method to dynamically adjust the tension size, contact length, detachment angle and seabed surface environment and other test conditions at both ends of the submarine cable to be tested, so as to obtain the change and law of the end load size during the test, and then accurately obtain the end load information under different working conditions, thereby solving the technical problem of how to accurately obtain the end load information of the submarine cable.

[0084] See also Figure 1 and Figure 8 The present invention provides a test device for simulating the free spanning working condition of a submarine cable, wherein the static test assembly includes a support frame 7;

[0085] The support frame 7 includes a bottom plate 13 and an inclined plate;

[0086] The inclined upper end surface of the inclined plate is connected to the actuator 6;

[0087] A slide rail 12 is provided on the upper end surface of the bottom plate 13 in the vertical direction;

[0088] One end of the inclined plate is connected to the slide rail 12, which is used to adjust the inclination angle of the inclined plate and change the force angle of the end of the submarine cable to be tested;

[0089] The other end of the inclined plate is rotatably connected to the upper end surface of the bottom plate 13;

[0090] The inclined plate, the bottom plate 13 and the slide rail 12 form a triangular structure;

[0091] A first sliding assembly 9 is disposed on the lower end surface of the bottom plate 13 , and the first sliding assembly 9 is provided with a first brake.

[0092] It should be noted that when performing static testing, a support frame 7 is arranged below the actuator 6, and the support frame 7 includes a bottom plate 13 and an inclined plate. A slide rail 12 is arranged on the upper end surface of the bottom plate 13 in the vertical direction. The inclined plate, the bottom plate 13 and the slide rail 12 form a triangular structure. The actuator 6 is inclined on the inclined plate, and the inclination angle of the inclined plate is adjustable. A first sliding component 9 is arranged on the lower end surface of the bottom plate 13. The first sliding component 9 is a first universal wheel, and the support frame 7 is driven by the first universal wheel to move to the bottom of the actuator 6, and then limited and fixed by the first brake. The first brake is a wedge brake, which is used to limit and fix the support frame 7 on the test platform 8.

[0093] It should be noted that the other end of the inclined plate is rotatably connected to the upper end surface of the bottom plate 13, preferably in a hinged manner.

[0094] In the embodiment of the present invention, the test condition of the pulling force at both ends is controlled by the tilted actuator 6 .

[0095] In an embodiment of the present invention, the static test component is connected to the actuator 6, which is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator 6, so that the inclined actuator 6 can simulate the static load. The tensile load of the submarine cable to be tested is controlled by the inclined actuator 6 to simulate the static loading condition, thereby realizing a cool static load test on the end of the submarine cable.

[0096] In one example of the present invention, the slide rail 12 includes an outer shell and an inner telescopic rod; the top of the inner telescopic rod is fixedly connected to the inclined plate; the outer shell is provided outside the inner telescopic rod, and the inner telescopic rod is slidably connected to the outer shell; a spring clip is provided on the circumference of the inner telescopic rod, and the outer shell is provided with a limiting hole groove adapted to the spring clip; the spring clip has a first state and a second state, the first state is that the spring clip pops out and is engaged with the limiting hole groove, and is used to limit one end of the inclined plate connected to the inner telescopic rod to the current height; the second state is that the spring clip does not pop out and is not engaged with the limiting hole groove, and is used to adjust the height of one end of the inclined plate connected to the inner telescopic rod.

[0097] In the embodiment of the present invention, the outer shell and the inner telescopic rod cooperate with each other to adjust the inclination angle of the inclined plate and change the stress angle of the end of the submarine cable to be tested.

[0098] In another example of the present invention, the slide rail 12 includes an electric telescopic slide rail; the top of the electric telescopic slide rail is detachably connected to the inclined plate; a plurality of limiting female buckles are arranged in the vertical direction around the electric telescopic slide rail, and the female buckles have a hollow or recessed structure; a male buckle is arranged at one end where the inclined plate is connected to the top of the electric telescopic slide rail, and the male buckle has a raised or protruding structure; the female buckle is adapted to the male buckle and is used to adjust the height of one end of the inclined plate connected to the inner telescopic rod.

[0099] It should be noted that the working principle of the electric telescopic slide is similar to that of the electric telescopic rod, which is extended and retracted through a hydraulic system, which will not be described in detail here.

[0100] In an embodiment of the present invention, one end of the inclined plate is connected to the top of the electric telescopic slide rail, and the electric telescopic slide rail is used to perform lifting and lowering movements to adjust the inclination angle of the inclined plate and change the force angle of the end of the submarine cable to be tested.

[0101] See also Figure 2 The present invention provides a test device for simulating the free-span working condition of a submarine cable, wherein the dynamic test assembly includes a pulley assembly and a hoisting fixing plate 10;

[0102] The hoisting fixing plate 10 is installed on the top of the test platform 8;

[0103] The top of the pulley assembly is fixed on the lifting fixing plate 10;

[0104] The hoisting and fixing plate 10 is connected to a driving device, and the driving device is used to drive the hoisting and fixing plate 10 to move in the horizontal direction, adjust the position of the pulley assembly, and change the force angle of the end of the submarine cable to be tested.

[0105] It should be noted that the lifting and fixing plate 10 is installed on the top of the test platform 8. It can be understood that a test fixture can be installed on the test platform 8. The height of the test fixture can be set according to needs and is not limited here. The lifting and fixing plate 10 is installed on the test fixture. The lifting and fixing plate 10 is connected to a driving device. The driving device is used to drive the lifting and fixing plate 10 to move in the horizontal direction, thereby driving the pulley assembly installed under the lifting and fixing plate 10 to move, thereby changing the end force angle of the right end of the submarine cable to be tested, which is used to simulate the dynamic loading phenomenon of the submarine cable. The driving device can be an electric push rod, which can be installed on the test fixture. The end of the electric push rod is connected to one side of the lifting and fixing plate 10, which is used to drive the lifting and fixing plate 10 to move in the horizontal direction.

[0106] See also Figure 2 , the present invention provides a test device for simulating the free-span working condition of a submarine cable, the pulley assembly includes a first pulley body and a second pulley body;

[0107] The first pulley body is rotatably connected to the lifting fixing plate 10;

[0108] The second pulley body is externally rotatably connected to a retaining frame, and a first traction rope is fixed on the retaining frame;

[0109] The top of the first traction rope is sleeved on the first pulley body;

[0110] The second pulley body is provided with a second traction rope;

[0111] One end of the second traction rope is connected to the actuator 6, and the other end of the second traction rope is connected to the submarine cable to be tested.

[0112] It should be noted that the pulley assembly includes a first pulley body and a second pulley body, and the first pulley body is rotatably connected to the lifting fixed plate 10; the second pulley body is rotatably connected to the outside of the second pulley body with a U-shaped retaining frame, and a first traction rope is fixed on the U-shaped retaining frame, and the top of the first traction rope is sleeved on the first pulley body, and a second traction rope is arranged on the outside of the second pulley body, one end of the second traction rope is connected to the actuator 6, and the other end of the second traction rope is connected to the submarine cable to be tested. It can be understood that the first pulley body is arranged at the top and the second pulley body is arranged at the bottom.

[0113] In the embodiment of the present invention, a fixed pulley is formed by setting the second pulley body in the pulley assembly. The main characteristic of the fixed pulley is that the direction of the force can be changed. The direction of the force generated by the actuator 6 may not directly meet the direction required for simulating dynamic loads. For example, the actuator 6 may apply force in the horizontal direction. When simulating the vertical dynamic load (such as the vertical force generated by the impact of waves) on the submarine cable to be tested, the horizontal force can be converted into a vertical force through the fixed pulley, that is, the actuator 6 is connected to the fixed pulley through a rope, one end of the rope is fixed to the actuator 6, and the other end is connected to the submarine cable to be tested by bypassing the fixed pulley, so that the direction of the force on the submarine cable to be tested is changed to a direction that meets the requirements of dynamic simulation.

[0114] In the embodiment of the present invention, the test condition of the pulling force at both ends is controlled by the vertically arranged actuator 6 .

[0115] In an embodiment of the present invention, the dynamic test component is connected to the actuator 6, which is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator 6, so that the vertically arranged actuator 6 can simulate the dynamic load. By controlling the tensile load of the submarine cable to be tested through the vertically arranged actuator 6, the dynamic loading condition is simulated, and a cool dynamic load test of the end of the submarine cable can be realized.

[0116] See also Figure 1-Figure 4 The present invention provides a test device for simulating the free-span working condition of a submarine cable, wherein the seabed simulation component comprises a plurality of arc plates with the upper ends facing inwardly concave;

[0117] The arc plates are connected by bolts to form an arc-shaped connecting plate 3 with a submarine cable placement groove on the upper end surface, and the submarine cable placement groove is used to place the submarine cable to be tested;

[0118] The arc-shaped connecting plate 3 is provided with a plurality of pressure sensors 5;

[0119] A plurality of pressure sensors 5 are arranged in a multi-piece arrangement to test the contact pressure distribution data between the submarine cable to be tested and the simulated seabed;

[0120] A contact plate 11 is laid in the submarine cable placement groove;

[0121] The contact plate 11 is bonded with seabed surface sediments, and the seabed surface sediments are used to simulate the seabed surface environment;

[0122] A displacement sensor is arranged in the submarine cable placement groove, and the displacement sensor is used to measure the displacement between the submarine cable to be tested and the simulated seabed.

[0123] It should be noted that the seabed simulation component includes a plurality of arc plates with inwardly concave upper ends, and the arc plates are connected by bolts in pairs to form an arc-shaped connecting plate 3 with a submarine cable placement groove on the upper end surface. The submarine cable placement groove is used to place the submarine cable to be tested, and the arc-shaped connecting plate 3 is provided with a plurality of pressure sensors 5; the plurality of pressure sensors 5 are arranged in a multi-piece arrangement to test the contact pressure distribution data between the submarine cable to be tested and the simulated seabed. The pressure sensor 5 is a thin film pressure sensor 5, and the single-piece range is 50N, the accuracy is 0.1N, and it is arranged in a multi-piece arrangement. During the test, the submarine cable to be tested is placed on the pressure sensor 5, and the pressure size and pressure distribution of the submarine cable to be tested and the simulated seabed are measured, so as to find the detachment point of the submarine cable to be tested. A contact plate 11 is laid in the submarine cable placement groove; the contact The plate 11 is bonded with seabed surface sediments, which are a mixture of clay, sand, and rubber materials. The materials are evenly bonded to the contact plate 11 to form a real seabed surface environment. The main parameters affecting the load on the end of the submarine cable span are the tension at both ends, contact length, detachment angle, seabed properties, etc., and the seabed properties are mainly contact stiffness. The contact stiffness is changed by changing the material of the laid seabed surface sediments, and the test condition of the seabed properties is changed to obtain the end load information of the submarine cable to be tested under different seabed property test conditions. A displacement sensor is provided in the submarine cable placement groove. The displacement sensor is specifically installed on the side of the simulated seabed by bonding. The displacement sensor here is used to determine the position of the submarine cable detachment point, and the measured displacement is the displacement between the seabed and the submarine cable.

[0124] See also Figure 1-Figure 4 The present invention provides a test device for simulating the free-span working condition of a submarine cable, wherein a convex connecting piece is provided at one end of the arc plate;

[0125] The other end of the arc plate is provided with a concave connecting piece;

[0126] The convex connecting piece of the arc plate member is fixedly connected with the concave connecting piece of another arc plate member through bolts.

[0127] It should be noted that the basic material of the arc plate surface is Q235 steel, and convex connectors and concave connectors are respectively provided at both ends of the arc plate. It can be understood that the interfaces at both ends of the arc plate are respectively in a "convex" and "concave" structure. When two arc plates are spliced, they are spliced ​​at the concave and convex parts and fixed with bolts. The two adjacent arc plates are spliced ​​end to end and then fixed with bolts to form an arc-shaped connecting plate 3 with a submarine cable placement groove on the upper end face. The number of arc plates determines the contact length between the submarine cable to be tested and the simulated seabed. By changing the number of arc plates, the contact length test condition is changed, and the end load information of the submarine cable to be tested under different contact length test conditions is obtained.

[0128] It should be noted that the arc plate ensures that the object to be tested fits tightly to the arc plate during the experiment, and the curvature of the arc plate reflects the bending curvature of the submarine cable.

[0129] See also Figure 1 and Figure 2 , the present invention provides a test device for simulating the free spanning working condition of a submarine cable, wherein the mobile platform 4 includes a mobile plate;

[0130] A steel beam composed of a plurality of steel beam frames is arranged in the vertical direction on the upper end surface of the movable plate, and the steel beam is used to adjust the horizontal height of the submarine cable to be tested installed on the top of the movable platform 4;

[0131] The lower end surface of the moving plate is provided with a second sliding assembly 9, and the second sliding assembly 9 is provided with a second brake.

[0132] It should be noted that the mobile platform 4 includes a mobile plate, and a steel beam composed of a plurality of steel beam frames is arranged in the vertical direction on the upper end surface of the mobile plate. The steel beam frame is a steel beam frame, and the test condition of the disengagement angle is adjusted by the horizontal position of the steel beam frame composed of the plurality of steel beam frames on the mobile platform 4. Specifically, the test condition of changing the disengagement angle can be achieved by changing the number of steel beam frames and then adjusting the height of the steel beam frame, or a steel beam frame with adjustable height can be provided, both of which can achieve the test condition of changing the disengagement angle.

[0133] It is worth mentioning that both the actuator 6 and the movable platform 4 can adjust the disengagement angle, and the horizontal positions of the actuator 6 and the movable platform 4 will affect the change of the disengagement angle. In the experiment, it can be decided which method to use based on the factors of specific test variables. For example, the actuator 6 is also used to fix the submarine cable. The horizontal position of the actuator 6 is limited by the length of the submarine cable, and the change of the horizontal position of the movable platform 4 will affect the change of the contact length test condition, but will not affect the experimental results.

[0134] The lower end surface of the movable plate is provided with a second sliding component 9, the second sliding component 9 is a second universal wheel, and the second sliding component 9 is provided with a second brake, which is a wedge brake.

[0135] See also Figure 1 and Figure 2 , the present invention provides a test device for simulating the free spanning working condition of a submarine cable, wherein the first tension sensor assembly includes a first connecting member 2 and a first tension sensor;

[0136] The second tension sensor assembly includes a second connecting member 14 and a second tension sensor;

[0137] One end of the submarine cable to be tested is connected to a first tension sensor, and is connected to a fixed bracket 1 through a first connecting member 2;

[0138] The first tension sensor is used to measure the tension data of the end connected to the fixing bracket 1 when the submarine cable to be tested is subjected to a tensile load;

[0139] The other end of the submarine cable to be tested is connected to a second tension sensor, and is connected to the actuator 6 via a second connecting member 14;

[0140] The second tension sensor is used to measure the tension data of the end portion connected to the actuator 6 when the submarine cable to be tested is subjected to a tensile load.

[0141] It should be noted that the first tension sensing assembly includes a first connecting member 2 and a first tension sensor. A fixing bracket 1 is provided on the left side of the upper end surface of the test platform 8. The first connecting member 2 is fixed to one side of the fixing bracket 1 by a screw and nut combination. One end of the first connecting member 2 is fixed to the fixing bracket 1, and the other end of the first connecting member 2 is detachably connected to one end of the first tension sensor. The other end of the first tension sensor is detachably connected to one end of the submarine cable to be tested.

[0142] An actuator 6 is provided on the right side of the upper end surface of the test platform 8, one end of the actuator 6 is hinged to the upper end surface of the test platform 8, the other end of the actuator 6 is connected to one end of the second connecting member 14, the other end of the second connecting member 14 is connected to one end of the second tension sensor, and the other end of the second tension sensor is connected to the end of the submarine cable to be tested away from the fixed bracket 1.

[0143] It should be noted that the first tension sensor and the second tension sensor have a range of 50KN, are connected to the two ends of the submarine cable to be tested, and are respectively connected to the first connector 2 and the second connector 14, to measure the response changes of the tension at both ends of the submarine cable to be tested when the submarine cable is subjected to a tensile load, and record them as end tension data.

[0144] See also Figure 1 and Figure 2 , the present invention provides a test device for simulating the free spanning working condition of a submarine cable, wherein the fixed bracket 1 is a right-angled triangle structure;

[0145] The first right-angled side of the fixed bracket 1 is fixedly connected to the upper end surface of the test platform 8;

[0146] The second right-angled side of the fixed bracket 1 is connected to the first tension sensor component;

[0147] A cross bar is arranged inside the fixing bracket 1 , and the cross bar is used to change the transmission path of the force acting on the fixing bracket 1 .

[0148] It should be noted that the fixing bracket 1 is made of steel and is provided with a plurality of groups of holes. The fixing bracket 1 is fixedly mounted on the test platform 8 by a combination of screws and nuts.

[0149] It should be noted that the fixed bracket 1 is a right-angled triangle structure, the first right-angled side of the fixed bracket 1 is fixedly connected to the upper end face of the test platform 8, the second right-angled side of the fixed bracket 1 is connected to the first tension sensor assembly, and a crossbar is arranged inside the fixed bracket 1, the crossbar is used to change the transmission path of the force acting on the fixed bracket 1, and the crossbar can share the load borne by the triangular structure. The load originally borne by the three sides of the triangle will be borne by the crossbar after the crossbar is provided, reducing the force burden of the three sides of the triangle, thereby extending the service life of the fixed bracket 1. When an external force acts on the fixed bracket 1, by arranging a crossbar inside the triangular structure, such as when subjected to lateral force, the crossbar can play a supporting role, limit the relative displacement of the two sides of the triangle, and enhance the anti-deformation ability. When the triangular structure is subjected to torque, the crossbar can work together with the three sides of the triangle to resist the torque, prevent the structure from being damaged due to torsion, and improve the torsion resistance.

[0150] The present invention has the following advantages:

[0151] (1) This test device is equipped with two sets of load application devices. The inclined actuator 6 can simulate static loads, and the vertical actuator 6 can simulate dynamic loads to control the tensile load of the submarine cable to be tested. The tensile force control of the actuator 6 is set to control the submarine cable to be tested and the arc-shaped connecting plate 3 to simulate the contact pressure of the seabed, so as to realize the end load verification experiment of the submarine cable span.

[0152] (2) Each component of the test device can be disassembled and moved at will. The test device is simple to assemble and portable.

[0153] (3) The load verification experiment on the end of the submarine cable span of this test device can realize the controllability of the test, facilitate the change of test conditions, simulate different working conditions, observe the changes and laws of the end load size during the test, and carry out research on the impact of the load size on the end of the submarine cable span, so as to predict the degree of wear of the load outer sheath at the end of the actual submarine cable span and take preventive measures in time.

[0154] (4) This test device uses a simple mechanical device to perform a submarine cable outer sheath wear test, which has a low test consumption cost. Based on the above reasons, this test device can be widely promoted in the fields of marine equipment testing and so on.

[0155] See also Fig. 9 The present invention provides a test method for a test device for simulating a free-spanning condition of a submarine cable, comprising:

[0156] Step 101: respond to a test request for a submarine cable to be tested.

[0157] Step 102: When the test request is to perform a static test, the actuator 6 is used to stretch the submarine cable to be tested. In cooperation with the fixed bracket 1, the mobile platform 4 and the static test assembly, the test controls the tensile tension of the submarine cable to be tested by controlling the actuator 6 to obtain the static end load information of the submarine cable to be tested under different static test conditions.

[0158] Step 103, when the test request is to perform a dynamic test, the actuator 6 is used to stretch the submarine cable to be tested, and the fixed bracket 1, the mobile platform 4 and the dynamic test assembly are coordinated to control the tensile tension of the submarine cable to be tested by controlling the actuator 6 to obtain the dynamic end load information of the submarine cable to be tested under different dynamic test conditions.

[0159] The test request refers to the test request information for simulating the free-spanning working condition of the submarine cable to be tested.

[0160] It should be noted that the end load information includes the end tension under static and dynamic loads and the contact pressure between the submarine cable and the seabed.

[0161] The main test conditions that affect the load on the ends of the submarine cable span include the tension at both ends, contact length, detachment angle, seabed properties, etc.

[0162] It should be noted that, through the control variable method, the above-mentioned submarine cable span end load test equipment is used to study the influence of the above-mentioned main parameters on the submarine cable end load and sensitivity analysis: the tension at both ends can be controlled by the actuator 6; the contact length can be adjusted by replacing the arc plate; the cable detachment angle can be adjusted by adjusting the actuator 6 and the pulley position; the tested seabed property is mainly the contact stiffness, which can be changed by changing the surface sediments of the seabed, such as mud, rubber, etc.

[0163] In the embodiment of the present invention, during the static test, the actuator 6 is used to stretch the submarine cable to be tested, and the fixed bracket 1, the mobile platform 4 and the static test assembly are cooperated. The test experiment controls the tensile tension of the submarine cable to be tested by controlling the actuator 6, and the static end load information such as the contact pressure and the tension at both ends is tested and recorded to study the static end load changes of the submarine cable suspension.

[0164] During the test, the tension can be controlled by adjusting the actuator 6 to simulate the working condition where the submarine cable to be tested receives a tensile load in the marine environment;

[0165] Control the horizontal position of the mobile platform 4 to adjust the disengagement angle and the length of the submarine cable laying;

[0166] The bending curvature and the span configuration of the test submarine cable are changed by changing the height and curvature of the arc-shaped connecting plate 3;

[0167] The contact stiffness between the test submarine cable and the simulated seabed is changed by changing the material laid on the surface of the arc-shaped connecting plate 3, that is, the material bonded to the simulated seabed contact plate 11.

[0168] In the embodiment of the present invention, during the dynamic test, the actuator 6 is used to stretch the submarine cable to be tested, and the fixed bracket 1, the mobile platform 4 and the dynamic test assembly are coordinated. The test experiment controls the tensile tension of the submarine cable to be tested by controlling the actuator 6, and the dynamic end load information such as contact pressure and tension at both ends is tested and recorded to study the dynamic end load changes of the submarine cable suspension span.

[0169] During the test, the tension can be controlled by adjusting the actuator 6 to simulate the working condition where the submarine cable to be tested receives a tensile load in the marine environment;

[0170] Control the horizontal position of the mobile platform 4 to adjust the disengagement angle and the length of the submarine cable laying;

[0171] The bending curvature and the span configuration of the test submarine cable are changed by changing the height and curvature of the arc-shaped connecting plate 3;

[0172] The contact stiffness between the test submarine cable and the simulated seabed is changed by changing the material laid on the surface of the arc-shaped connecting plate 3, that is, the material bonded to the simulated seabed contact plate 11.

[0173] See also Figure 1 , carry out the load change test on the end of the submarine cable span under static load and install the test device.

[0174] In specific implementation, the bottom of the fixed bracket 1 is symmetrically provided with 6 limit grooves, and the fixed bracket 1 is fixedly installed on the test platform 8 by means of a combination of screws and nuts, and the mobile platform 4 is horizontally pushed to a suitable position and fixed by means of a second brake to limit its horizontal movement and ensure its stability. Simulated seabed materials such as sand and stone are laid on the contact plate 11 of the simulated seabed, and the contact plate 11 of the simulated seabed is placed and installed in the submarine cable placement groove and fixed, and the arc connecting plate 3 is fixedly installed on the mobile platform 4 by means of a combination of screws and nuts, and a pressure sensor 5 and a displacement sensor are installed on the surface of the arc connecting plate 3 for test measurement, and the sensors are all connected by bonding. Then, use a crane and other equipment to install the submarine cable to be tested, and place the submarine cable to be tested on the arc-shaped connecting plate 3. The two ends of the submarine cable to be tested are respectively connected to the first connecting member 2 and the second connecting member 14 by a screw-nut combination. The first connecting member 2 and the second connecting member 14 are provided with screw holes and pins, which can be used to connect the test submarine cable and the tension sensor. The other end of the first connecting member 2 is connected to the fixed bracket 1 by a screw-nut combination. After fixing the two ends of the submarine cable to be tested, the submarine cable to be tested is placed on the arc-shaped connecting plate 3. Similarly, the other end of the submarine cable to be tested is connected to the actuator 6, and the support frame 7 is fixed to the test platform 8 by a screw-nut combination, and the actuator 6 is tilted and placed on the support frame 7. The support frame 7 is adjusted to tilt the actuator 6 to a suitable angle, and the other end of the actuator 6 is fixed to the test platform 8.

[0175] according to Figure 2 As shown, a load change test of the end of the suspended span of the submarine cable under dynamic load is carried out, and the test device is installed in the same manner as above. During the installation of this test device, the support frame 7 structure is cancelled, and the actuator 6 is installed vertically to the test platform 8, and then the pulley assembly is installed, and the hoisting fixing plate 10 is used to fix the pulley assembly.

[0176] according to Figure 3 and Figure 4 As shown, the arrangement positions of sensors such as the pressure sensor 5 on the simulated seabed in the actual test are shown.

[0177] according to Figure 5 As shown, the stress condition of the actual test submarine cable span is shown; Figure 6 Taking the contact section between the test submarine cable and the seabed as an example, a contact point is taken to carry out force analysis. In addition to the tension TL and TR at both ends, the test submarine cable is also subjected to support and friction from the seabed. The magnitude of the friction may affect the wear of the submarine cable.

[0178] See also Figure 7 , Figure 7 The factors affecting the load on the end of the submarine cable span are tested, including contact length, contact stiffness, end tension and contact section bending curvature.

[0179] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0180] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0181] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test device for simulating the free spanning working condition of a submarine cable, characterized in that: Includes test platform; The test platform is provided with a mobile platform, a static test component and a dynamic test component; The submarine cable to be tested is installed on the top of the mobile platform through a seabed simulation component, and the seabed simulation component is used to simulate the seabed surface environment; One end of the submarine cable to be tested is connected to the fixed bracket through a first tension sensor assembly, and the other end of the submarine cable to be tested is connected to the actuator through a second tension sensor assembly; One end of the actuator away from the submarine cable to be tested is connected to the test platform; The static test assembly is connected to the actuator and is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator to simulate a static loading condition; The dynamic test assembly is connected to the actuator and is used to adjust the force angle of the end of the submarine cable to be tested connected to the actuator to simulate a dynamic loading condition.

2. The test device for simulating the free spanning working condition of a submarine cable according to claim 1 is characterized in that: The static test assembly includes a support frame; The support frame includes a bottom plate and an inclined plate; The inclined upper end surface of the inclined plate is connected to the actuator; A slide rail is provided on the upper end surface of the bottom plate in the vertical direction; One end of the inclined plate is connected to the slide rail, and is used to adjust the inclination angle of the inclined plate to change the force angle of the end of the submarine cable to be tested; The other end of the inclined plate is rotatably connected to the upper end surface of the bottom plate; The inclined plate, the bottom plate and the slide rail form a triangular structure; A first sliding assembly is disposed on the lower end surface of the bottom plate, and the first sliding assembly is disposed with a first brake.

3. The test device for simulating the free spanning working condition of a submarine cable according to claim 1 is characterized in that: The dynamic test assembly includes a pulley assembly and a hoisting fixing plate; The hoisting fixing plate is installed on the top of the test platform; The top of the pulley assembly is fixed to the hoisting fixing plate; The hoisting fixing plate is connected to a driving device, and the driving device is used to drive the hoisting fixing plate to move in a horizontal direction, adjust the position of the pulley assembly, and change the force angle of the end of the submarine cable to be tested.

4. The test device for simulating the free-span working condition of a submarine cable according to claim 3 is characterized in that: The pulley assembly includes a first pulley body and a second pulley body; The first pulley body is rotatably connected to the hoisting fixing plate; The second pulley body is externally rotatably connected to a retaining frame, and the retaining frame is fixed with a first traction rope; The top of the first traction rope is sleeved on the first pulley body; The second pulley body is provided with a second traction rope; One end of the second traction rope is connected to the actuator, and the other end of the second traction rope is connected to the submarine cable to be tested.

5. The test device for simulating the free spanning working condition of a submarine cable according to claim 1 is characterized in that: The seabed simulation assembly comprises a plurality of arc plates with upper ends facing inwardly concave; The arc plates are connected in pairs by bolts to form an arc-shaped connecting plate with a submarine cable placement groove on the upper end surface, and the submarine cable placement groove is used to place the submarine cable to be tested; The arc-shaped connecting plate is provided with a plurality of pressure sensors; The plurality of pressure sensors are arranged in a multi-piece arrangement to test the contact pressure distribution data between the submarine cable to be tested and the simulated seabed; A contact plate is laid in the submarine cable placement groove; The contact plate is bonded with seabed surface sediments, and the seabed surface sediments are used to simulate the seabed surface environment; A displacement sensor is arranged in the submarine cable placement groove, and the displacement sensor is used to measure the displacement between the submarine cable to be tested and the simulated seabed.

6. The test device for simulating the free spanning working condition of a submarine cable according to claim 5 is characterized in that: A convex connecting piece is provided at one end of the arc plate; The other end of the arc plate is provided with a concave connecting piece; The convex connecting piece of the arc plate member is fixedly connected to the concave connecting piece of another arc plate member by means of bolts.

7. The test device for simulating the free-span working condition of a submarine cable according to claim 1, characterized in that: The mobile platform includes a mobile plate; A steel beam composed of a plurality of steel beam frames is arranged in the vertical direction on the upper end surface of the movable plate, and the steel beam is used to adjust the horizontal height of the submarine cable to be tested installed on the top of the movable platform; A second sliding assembly is disposed on the lower end surface of the moving plate, and the second sliding assembly is disposed with a second brake.

8. The test device for simulating the free-span working condition of a submarine cable according to claim 1, characterized in that: The first tension sensing assembly includes a first connecting member and a first tension sensor; The second tension sensor assembly includes a second connecting member and a second tension sensor; One end of the submarine cable to be tested is connected to the first tension sensor, and is connected to the fixing bracket through the first connecting member; A first tension sensor is used to measure the tension data of the end connected to the fixed bracket when the submarine cable to be tested is subjected to a tensile load; The other end of the submarine cable to be tested is connected to the second tension sensor, and is connected to the actuator through the second connecting member; The second tension sensor is used to measure the tension data of the end connected to the actuator when the submarine cable to be tested is subjected to a tensile load.

9. The test device for simulating the free-span working condition of a submarine cable according to any one of claims 1 or 8, characterized in that: The fixed bracket is a right triangle structure; The first right-angled side of the fixed bracket is fixedly connected to the upper end surface of the test platform; The second right-angled side of the fixing bracket is connected to the first tension sensor assembly; A cross bar is arranged inside the fixing bracket, and the cross bar is used to change the transmission path of the force acting on the fixing bracket.

10. A test method applied to the test device for simulating the free spanning working condition of a submarine cable according to any one of claims 1 to 9, characterized in that: include: Respond to test requests for submarine cables to be tested; When the test request is to perform a static test, the actuator is used to stretch the submarine cable to be tested. In conjunction with the fixed bracket, mobile platform and static test assembly, the test controls the tensile tension of the submarine cable to be tested by controlling the actuator to obtain the static end load information of the submarine cable to be tested under different static test conditions; When the test request is to perform a dynamic test, the actuator is used to stretch the submarine cable to be tested. In conjunction with the fixed bracket, mobile platform and dynamic test assembly, the test controls the tensile tension of the submarine cable to be tested by controlling the actuator to obtain the dynamic end load information of the submarine cable to be tested under different dynamic test conditions.

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