Submarine cable fatigue test device and fatigue test method

Abstract

The application relates to the technical field of submarine cable detection equipment, and particularly discloses a submarine cable fatigue test device and a fatigue test method. The driving mechanism of the bending module of the submarine cable fatigue device is connected to the support and is used for driving the bending mechanism to move up and down, and the bending mechanism is used for cooperating with the mounting part of the submarine cable and driving the mounting part to move up and down. The output end of the driving mechanism is in transmission connection with the first mounting frame of the bending mechanism. The plurality of abutting components are divided into an upper group and a lower group, and the plurality of abutting components in the same group are arranged at intervals along the length direction of the support. The abutting surfaces of the plurality of abutting components in the upper group are sequentially arranged to form an upper constraint arc surface which protrudes downward, and the abutting surfaces of the plurality of abutting components in the lower group are sequentially arranged to form a lower constraint arc surface which protrudes upward. The upper constraint arc surface and the lower constraint arc surface are oppositely arranged, and a shaping channel for the submarine cable is defined between the upper constraint arc surface and the lower constraint arc surface. The bending module can simulate the actual working condition of the submarine cable, and the accuracy of the test is improved.

Description

Technical Field

[0001] This invention relates to the field of submarine cable testing equipment technology, and in particular to a submarine cable fatigue testing device and fatigue testing method. Background Technology

[0002] Submarine cables are core infrastructure for marine energy transmission and communication, and their operational stability directly affects the safety of systems such as offshore wind power and cross-sea communication. In the seabed environment, due to ocean currents and seabed geological activities, some submarine cables are hollowed out by sediment, forming hollowed-out sections. These hollowed-out sections of the submarine cable lose continuous support from the seabed, and are only connected to the cable section buried in the seabed at both ends. Under the action of ocean currents, they undergo repeated tensile and bending deformations, which can easily lead to fatigue damage and structural deformation over a long period of time. In severe cases, this can cause the cable to break, resulting in significant economic losses.

[0003] Existing testing devices for hollowed-out sections of submarine cables can only perform local oscillation tests on submarine cables that bend downwards. They cannot simulate the actual state of submarine cables when disturbed by seawater on the seabed. In particular, they cannot simulate the situation where submarine cables will bulge upwards when the seawater disturbance is large. Therefore, it is difficult to effectively test submarine cables, and the test results are inaccurate.

[0004] Therefore, there is an urgent need for a fatigue testing device and method for submarine cables to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a fatigue testing device and method for submarine cables, which can comprehensively and accurately simulate the actual working conditions of submarine cables with hollowed-out sections and obtain more accurate test results.

[0006] To achieve this objective, the present invention adopts the following technical solution: A fatigue testing device for submarine cables includes a support frame, a bending module, two seabed simulation modules, and two fixed tensile modules, wherein the bending module, the two seabed simulation modules, and the two fixed tensile modules are all connected to the support frame. The bending module is located between the two fixed tensioning modules, which are used to fix both ends of the submarine cable; a seabed simulation module is provided between each fixed tensioning module and the bending module, which is used to support the submarine cable. The bending module includes a drive mechanism and a bending mechanism. The drive mechanism is connected to the bracket and is used to drive the bending mechanism to move up and down. The bending mechanism is used to cooperate with the mounting part of the submarine cable and drive it to move up and down. The bending mechanism includes a first mounting frame and multiple abutment components. The output end of the drive mechanism is connected to the first mounting frame. The multiple abutment components are divided into an upper group and a lower group. Multiple abutment components in the same group are arranged at intervals along the length direction of the bracket. The abutment surfaces of multiple abutment components in the upper group are arranged in sequence to form a downwardly convex upper constraint arc surface. The abutment surfaces of multiple abutment components in the lower group are arranged in sequence to form an upwardly convex lower constraint arc surface. The upper constraint arc surface and the lower constraint arc surface are arranged opposite each other, and a shaping channel for submarine cables to pass through is defined between them.

[0007] Preferably, the abutting assembly includes a first abutting member, a movable base, and a first adjusting member. The upper and lower parts of the first mounting bracket are provided with a first channel. The first adjusting member passes through the first channel and can move up and down along the axial direction of the first channel. The end of the first adjusting member near the shaping channel is connected to the movable base. The movable base is connected to the first abutting member, and the abutting surface is provided on the first abutting member.

[0008] Preferably, the first mounting bracket is provided with a plurality of guide grooves, all of which extend along the height direction of the bracket and are arranged with their openings facing each other in pairs. The movable base is slidably disposed in two of the guide grooves on both sides along the width direction of the bracket.

[0009] Preferably, the abutting component further includes a limiting member, which is connected to the movable base. The width of the limiting member is greater than the width of the guide groove. The limiting member abuts against the first mounting bracket and is located outside the opening of the guide groove.

[0010] Preferably, the abutment assembly further includes a second adjusting member, a second channel is provided on the movable base, the second adjusting member passes through the second channel, the second adjusting member is movable along the axial direction of the second channel, and the end of the second adjusting member near the shaping channel is connected to the first abutment member; each movable base is connected to a plurality of second adjusting members, the axes of the plurality of second adjusting members are arranged at an angle, and the plurality of second adjusting members are respectively connected to one or more of the first abutment members.

[0011] Preferably, the minimum distance between the upper constraint arc surface and the lower constraint arc surface is equal to the diameter of the submarine cable.

[0012] Preferably, the driving mechanism includes a second mounting bracket and a first driving component. The second mounting bracket is mounted on the bracket, and the output end of the first driving component is connected to the first mounting bracket in a transmission manner. The second mounting bracket is also provided with a first guide rail extending along the height direction of the bracket, and the first mounting bracket is slidably mounted on the first guide rail.

[0013] Preferably, the fixed tensioning module includes a fixing mechanism and a tensioning mechanism. The fixing mechanism includes a third mounting bracket connected to the support and reciprocating along the length of the support. The third mounting bracket is provided with a fixing member for fixing the submarine cable. The tensioning mechanism includes a second driving component connected to the support. The output end of the second driving component is connected to the third mounting bracket, and the second driving component is used to drive the third mounting bracket to move on the support.

[0014] Preferably, the seabed simulation module includes a seabed simulation mechanism, which includes a simulated seabed and a third drive component. The third drive component is connected to the support frame, and its output end is connected to the simulated seabed for driving the simulated seabed to move up and down along the height direction of the support frame. The simulated seabed is used to support the submarine cable.

[0015] A fatigue testing method for submarine cables, applied to the aforementioned submarine cable fatigue testing apparatus, includes the following steps: S1. Pass the submarine cable through the shaping channel, and fix both ends of the submarine cable to two fixed tensioning modules respectively; S2. Adjust multiple abutment components to form a shaping channel with the target curvature; S3. Drive the bending mechanism to move up and down. The submarine cable in the shaping channel swings back and forth with the bending mechanism in the height direction of the support. The submarine cable section outside the shaping channel is supported by the seabed simulation module.

[0016] The beneficial effects of this invention are as follows: The submarine cable fatigue testing device includes a support frame, a bending module, two seabed simulation modules, and two fixed tension modules. All three modules are connected to the support frame. The bending module is located between the two fixed tension modules, which are used to fix both ends of the submarine cable. A seabed simulation module is provided between each fixed tension module and the bending module, and this module supports the submarine cable. The bending module includes a drive mechanism and a bending mechanism. The drive mechanism is connected to the support frame and drives the bending mechanism to move up and down, bending the cable. The mechanism is used to cooperate with the installation part of the submarine cable and drive it to move up and down. The bending mechanism includes a first mounting frame and multiple abutment components. The output end of the drive mechanism is connected to the first mounting frame. The multiple abutment components are divided into an upper group and a lower group. Multiple abutment components in the same group are arranged at intervals along the length of the support. The abutment surfaces of multiple abutment components in the upper group are arranged in sequence to form a downwardly convex upper constraint arc surface. The abutment surfaces of multiple abutment components in the lower group are arranged in sequence to form an upwardly convex lower constraint arc surface. The upper constraint arc surface and the lower constraint arc surface are arranged opposite each other, and a shaping channel for the submarine cable to pass through is defined between them. By defining the shaping channel for the submarine cable to pass through by multiple abutment components, and by driving the first mounting frame to move up and down by the drive mechanism, the submarine cable undergoes different bending deformations within the shaping channel. This can simulate the various shapes of the submarine cable in the hollowed-out section when disturbed by seawater, thereby obtaining more accurate and realistic test results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the submarine cable fatigue testing device provided by the present invention; Figure 2 This is a schematic diagram of the bending module provided by the present invention; Figure 3 This is a schematic diagram of the bending mechanism provided by the present invention; Figure 4 This is a schematic diagram of the structure of the fixed stretching module provided by the present invention; Figure 5 This is a schematic diagram of the structure of the seabed simulation module provided by the present invention; Figure 6 This is a schematic diagram of the structure of the third driving component provided by the present invention; Figure 7 This is a schematic diagram of the submarine cable under different bending shapes provided by the present invention.

[0018] In the picture: 100. Submarine cables; 1. Support; 11. First segment; 12. Second segment; 2. Bending module; 21. Drive mechanism; 211. Second mounting bracket; 212. First power component; 213. First transmission component; 214. First connecting component; 22. Bending mechanism; 221. First mounting bracket; 222. First abutment component; 223. Movable base; 224. First adjusting component; 225. Second adjusting component; 226. Limiting component; 3. Seabed simulation module; 31. Seabed simulation mechanism; 311. Seabed frame; 312. Third drive assembly; 3121. Third power component; 3122. Third transmission component; 3123. Lifting component; 3124. Coupling; 3125. Fifth connecting component; 3126. Fifth mounting bracket; 32. Support mechanism; 321. Sixth mounting bracket; 322. Support frame; 323. Second abutment component; 4. Fixed tensioning module; 41. Fixing mechanism; 411. Third mounting bracket; 412. Fixing component; 413. Bearing assembly; 414. First connecting bracket; 42. Tensioning mechanism; 421. Fourth mounting bracket; 422. Third guide rail; 423. Second connecting bracket; 424. Third connecting component; 425. Fourth connecting component; 426. Elastic component; 427. Second power component; 428. Second transmission component. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] This embodiment provides a submarine cable fatigue testing device to comprehensively and accurately simulate the actual working conditions of the hollowed-out section of the submarine cable 100, thereby effectively testing the submarine cable 100 and obtaining more accurate test results.

[0024] like Figure 1 As shown, the submarine cable fatigue testing device includes a support 1, a bending module 2, two seabed simulation modules 3, and two fixed tension modules 4. The bending module 2, the two seabed simulation modules 3, and the two fixed tension modules 4 are all connected to the support 1. The bending module 2 is located between the two fixed tension modules 4. The two fixed tension modules 4 are used to fix both ends of the submarine cable 100. A seabed simulation module 3 is provided between each fixed tension module 4 and the bending module 2. The seabed simulation module 3 is used to support the submarine cable 100.

[0025] like Figure 2 As shown, the bending module 2 includes a drive mechanism 21 and a bending mechanism 22. The drive mechanism 21 is connected to the bracket 1 and is used to drive the bending mechanism 22 to move up and down. The bending mechanism 22 is used to cooperate with the mounting part of the submarine cable 100 and drive it to move up and down.

[0026] like Figure 3As shown, the bending mechanism 22 includes a first mounting frame 221 and multiple abutment components. The output end of the drive mechanism 21 is connected to the first mounting frame 221 via a transmission. In this embodiment, the first mounting frame 221 is a grid truss, ensuring sufficient strength while avoiding excessive weight. The multiple abutment components are divided into an upper group and a lower group. Multiple abutment components in the same group are arranged at intervals along the length direction of the support 1. The abutment surfaces of the multiple abutment components in the upper group are arranged sequentially to form a downwardly convex upper constraint arc surface. The abutment surfaces of the multiple abutment components in the lower group are arranged sequentially to form an upwardly convex lower constraint arc surface. The upper constraint arc surface and the lower constraint arc surface are arranged opposite each other, and a plastic channel for the submarine cable 100 to pass through is defined between them. The minimum distance between the upper constraint arc surface and the lower constraint arc surface is equal to the diameter of the submarine cable 100, which can always abut a portion of the submarine cable 100, cooperating with the drive mechanism 21 to make the submarine cable 100 swing back and forth in the height direction of the support 1. Different bending forms of the submarine cable 100 are shown in the figure. Figure 7 As shown, the submarine cable 100 is in a horizontal state, an upward bending state, and a downward bending state.

[0027] The abutment assembly includes a first abutment member 222, a movable base 223, a first adjusting member 224, and a second adjusting member 225. The upper and lower parts of the first mounting bracket 221 are each provided with a first channel. The first adjusting member 224 passes through the first channel and can move up and down along the axial direction of the first channel. The end of the first adjusting member 224 near the molding channel is connected to the movable base 223. The movable base 223 is provided with a second channel, and the second adjusting member 225 passes through the second channel and can move along the axial direction of the second channel. The end of the second adjusting member 225 near the molding channel is connected to the first abutment member 222. Multiple second adjusting members 225 are connected to each movable base 223. The axes of the multiple second adjusting members 225 are arranged at an angle, and the extension line of the second adjusting member 225 intersects the center line of the molding channel. Each of the multiple second adjusting members 225 is connected to one or more first abutment members 222. In this embodiment, two second adjusting members 225 are connected to the movable base 223, and each second adjusting member 225 is connected to a first abutment member 222. In this embodiment, both the first adjusting member 224 and the second adjusting member 225 are screws. By setting the first adjusting member 224, the position of the movable base 223 can be adjusted, thereby adjusting the position of the first abutment member 222. The upper and lower constraining arc surfaces can be quickly and accurately adjusted to the target arc to facilitate the formation of a shaping channel. By setting the second adjusting member 225, which is directly connected to the first abutment member 222, the position of the first abutment member 222 can be adjusted. The two second adjusting members 225, which are arranged at an angle, drive the two first abutment members 222 to abut and constrain the submarine cable 100 from both sides of the width direction of the bracket 1. Further, the first abutment member 222 is a rolling element. In this embodiment, the first abutment member 222 is a fisheye bearing. In some embodiments, other types of rolling elements may also be used. The first contacting part 222 is the only component in the bending module 2 that directly contacts the submarine cable 100. It can apply a surface normal contact force to the submarine cable 100 and, through rolling, avoid excessive friction between it and the submarine cable 100, thus preventing additional damage and further ensuring the accuracy of the test.

[0028] Furthermore, the first mounting bracket 221 is provided with multiple guide slots, all extending along the height direction of the bracket 1, and arranged with their openings facing each other in pairs. The movable base 223 is slidably disposed in two guide slots on both sides along the width direction of the bracket 1. The guide slots restrict the movable base 223 to sliding only along the height direction of the bracket 1, further preventing displacement when adjusting the position of the first abutment 222 and improving the adjustment accuracy.

[0029] The abutment assembly also includes a limiting member 226, which is connected to the movable base 223. The width of the limiting member 226 is greater than the width of the guide groove. The limiting member 226 abuts against the outer edge of the guide groove and is located outside the opening of the guide groove. Specifically, when installing the movable base 223, the movable base 223 can be slightly tilted and placed in the guide groove, then the movable base 223 is placed horizontally, and finally the limiting member 226 is connected to the movable base 223. The limiting member 226 restricts the movable base 223 from moving out of the guide groove, thereby improving the efficiency of installing the movable base 223 into the guide groove. Furthermore, the limiting member 226 has a cylindrical structure, which can reduce the sliding resistance of the limiting member 226 during the movement of the movable base 223. The movable base 223 is provided with a limiting mounting hole, and the limiting member 226 passes through the limiting mounting hole.

[0030] like Figure 2 As shown, the drive mechanism 21 includes a second mounting bracket 211 and a first drive assembly. The second mounting bracket 211 is disposed on the bracket 1, and the first drive assembly is disposed on the second mounting bracket 211, with the output end of the first drive assembly being drively connected to the first mounting bracket 221. Further, the first drive assembly includes a first power component 212, a first transmission component 213, and a first connecting component 214. The power of the first power component 212 is transmitted to the first transmission component 213, which is connected to the first mounting bracket 221 via the first connecting component 214. The driven first transmission component 213 can drive the first mounting bracket 221 to reciprocate along the height direction of the bracket 1. In this embodiment, the first power component 212 is a motor and a reducer, the first transmission component 213 is a crank, and the first connecting component 214 is a connecting rod. Further, the first drive assembly is disposed at the upper end of the second mounting bracket 211. The first mounting bracket 221 also includes a lifting beam, to which the first transmission component 213 is connected. In this embodiment, the lifting beam is located at the center of the first mounting frame 221. By placing the lifting beam at the center of the first mounting frame 221, the first mounting frame 221 can be raised and lowered smoothly.

[0031] In addition, the second mounting bracket 211 is also provided with a first guide rail extending along the height direction of the bracket 1, and the first mounting bracket 221 is slidably disposed on the first guide rail. In this embodiment, the first mounting bracket 221 is provided with a first sliding member on the side near the first guide rail, and the first sliding member can reciprocate along the first guide rail. The first sliding member is a slider, and the slider is provided with a groove that matches the shape of the first guide rail.

[0032] like Figure 1 , Figure 2As shown, the support 1 further includes a first segment 11 and a second segment 12, both of which are disposed on the same plane. The extension directions of the first segment 11 and the second segment 12 are perpendicular to each other, and both the first segment 11 and the second segment 12 can be set to different lengths according to their own needs. Both the first segment 11 and the second segment 12 are provided with mounting grooves arranged along their own length direction to facilitate the installation of various modules or mechanisms onto the support 1. In this embodiment, the second segment 12 is located at the middle position of the support 1. The bending module 2 is installed onto the second segment 12, while the seabed simulation module 3 and the fixed tension module 4 are both installed onto the first segment 11.

[0033] like Figure 4 As shown, the fixed tension module 4 includes a fixing mechanism 41 and a tensioning mechanism 42. The fixing mechanism 41 includes a third mounting bracket 411, which is connected to the support 1 and reciprocates along the length of the support 1. A fixing member 412 for fixing the submarine cable 100 is provided on the third mounting bracket 411. In this embodiment, the submarine cable fatigue testing device also includes a second guide rail, which extends along the length of the support 1. The third mounting bracket 411 is slidably mounted on the second guide rail. In this embodiment, the fixing member 412 is a clamp. In this embodiment, a second sliding member is provided on the third mounting bracket 411, which can reciprocate along the second guide rail. The second sliding member is a slider, and the slider has a groove that matches the shape of the second guide rail.

[0034] The fixing mechanism 41 also includes bearing assemblies 413, which are mounted on the third mounting bracket 411. Each bearing assembly 413 includes an outer frame and several rollers arranged within the outer frame and around its axis. Multiple bearing assemblies 413 are provided, spaced apart along the length of the bracket 1. In this embodiment, a bearing assembly 413 is provided at each end of the fixing member 412. The bearing assemblies 413 can cooperate with the fixing member 412, further improving the stability of fixing the end of the submarine cable 100 and preventing the submarine cable 100 from breaking at the end of the fixing member 412.

[0035] The fixing mechanism 41 also includes a first connecting frame 414 and a second connecting member. The first connecting frame 414 is also disposed on the third mounting frame 411 and is located at the end away from the bending module 2. A first channel is opened on the first connecting frame 414. One end of the second connecting member is connected to the first connecting frame 414, and the other end passes through the first channel and connects to the end of the submarine cable 100 fixed by the fixing member 412. By providing the first connecting frame 414, it is convenient for the fixing mechanism 41 to be subsequently connected to the tensioning mechanism 42.

[0036] The tensioning mechanism 42 includes a fourth mounting bracket 421, a third guide rail 422, a connecting assembly, and a second drive assembly. The fourth mounting bracket 421 is connected to the bracket 1, the third guide rail 422 is connected to the fourth mounting bracket 421, and the connecting assembly is slidably disposed on the third guide rail 422. In this embodiment, the connecting assembly is provided with a third sliding member, which can reciprocate along the third guide rail 422. The third sliding member is a slider, and the slider is provided with a groove that matches the shape of the third guide rail 422. Further, the connecting assembly includes a second connecting bracket 423, a third connecting member 424, and an elastic member 426. A second channel is opened on the first connecting bracket 414, and a third channel is opened on the second connecting bracket 423. One end of the third connecting member 424 passes through the second channel, and the other end passes through the third channel. An elastic member 426 is provided between the third connecting member 424 and the second connecting bracket 423. The elastic member 426 is used to apply an elastic force to the third connecting member 424 to tension the submarine cable 100. In this embodiment, the other end of the third connector 424 is provided with a limiting protrusion, and the elastic element 426 is a spring, which is clamped between the limiting protrusion and the second connecting frame 423. In this embodiment, both the second connector and the third connector 424 are connecting rods. By setting the elastic element 426 on the connecting assembly, the elastic deformation of the elastic element 426 can simulate the axial deformation of the submarine cable 100 on both sides when the hollowed-out section of the submarine cable 100 shakes, which can better fit the actual working state and improve the effectiveness and accuracy of the test. It should be noted that in actual working conditions, the span of the submarine cable 100 on both sides of the hollowed-out section is relatively long, and when it shakes due to the impact of water flow, the cable axial deformation can produce a large amount of expansion and contraction deformation; while in the dryland cable fatigue test device in this embodiment, the cable constraint length on both sides of the hollowed-out section is relatively short, making it difficult to produce the same amplitude of axial displacement. By setting the elastic element 426, the compressibility of the spring is used to equivalently simulate the axial deformation of the long-distance cable.

[0037] The second drive assembly includes a second power component 427 and a second transmission component 428, and the connecting assembly includes a fourth connector 425. One end of the second power component 427 is fixedly connected to the fourth mounting bracket 421, and the other end is a power output end connected to the second transmission component 428. In this embodiment, the second power component 427 is a jack, and the second transmission component 428 is a distribution beam. A fourth channel is also provided on the second connecting bracket 423, and one end of the fourth connector 425 is connected to the second connecting bracket 423, and the other end passes through the fourth channel and is connected to the second transmission component 428. In this embodiment, the fourth connector 425 is a connecting rod. The second drive assembly is used to drive the third mounting bracket 411 to move on the second guide rail, and can precisely adjust the axial tension applied to the submarine cable 100.

[0038] like Figure 5As shown, the seabed simulation module 3 includes a seabed simulation mechanism 31 and a support mechanism 32. The seabed simulation mechanism 31 includes a simulated seabed and a third drive component 312. The third drive component 312 is connected to the support 1, and its output end is connected to the simulated seabed for driving the simulated seabed to rise and fall along the height direction of the support 1. The simulated seabed is used to support the submarine cable 100.

[0039] like Figure 6 As shown, the third drive assembly 312 includes a third power component 3121, a third transmission component 3122, and a lifting component 3123. The output end of the third power component 3121 is driven to the input end of the third transmission component 3122, and is connected to at least two third transmission components 3122. The output end of the third transmission component 3122 is driven to at least two lifting components 3123. The lifting components 3123 can support the bottom of the simulated seabed and drive the simulated seabed to rise and fall. In addition, the third drive assembly 312 also includes a fifth connecting component 3125 and a coupling 3124. In this embodiment, the third power component 3121 is connected to two third transmission components 3122 respectively through the coupling 3124 and the fifth connecting component 3125. Each third transmission component 3122 is connected to two lifting components 3123 respectively through the coupling 3124 and the fifth connecting component 3125, that is, a total of four lifting components 3123 are driven to support the bottom of the simulated seabed and raise and lower. Preferably, the four lifting components 3123 are arranged at the four corners of the simulated seabed. In this embodiment, the third power component 3121 is a motor and a reducer, the third transmission component 3122 is a steering gear, and the lifting component 3123 is a turbine. By setting multiple lifting components 3123, the simulated seabed can be stably lifted. By adjusting the relative position between the simulated seabed and the submarine cable 100, the contact pressure between the simulated seabed and the submarine cable 100 can be adjusted to ensure that the contact pressure of the simulated seabed on the cable is consistent with the actual seabed environment.

[0040] The simulated seabed includes a seabed frame 311 and simulated material. The seabed frame 311 is connected to the output end of the third drive component 312, and the simulated material is laid on the seabed frame 311. The simulated material is a material with a hardness matching that of seabed sediments, capable of replicating the rough texture of a real seabed and simulating the contact friction between the submarine cable 100 and the seabed. Furthermore, the seabed simulation mechanism 31 also includes a fifth mounting frame 3126 and a fourth guide rail. The fifth mounting frame 3126 is connected to the support 1 and located on the outside of the simulated seabed. The fourth guide rail is disposed on the fifth mounting frame 3126 and extends along the height direction of the support 1. The seabed frame 311 is slidably mounted on the fourth guide rail. In this embodiment, a fourth sliding member is provided on the seabed frame 311, which can reciprocate along the fourth guide rail. The fourth sliding member is a slider with a groove matching the shape of the fourth guide rail. By setting the fourth guide rail, the simulated seabed can be further stabilized and raised, making the adjustment process of the simulated seabed more reliable.

[0041] The support mechanism 32 includes a sixth mounting frame 321 and a support assembly. The sixth mounting frame 321 is connected to the bracket 1 and located on one side of the simulated seabed. The support assembly includes a support frame 322 and multiple second abutment members 323. The support frame 322 is connected to the sixth mounting frame 321. The multiple second abutment members 323 are spaced apart around the axis of the support frame 322, forming an abutment channel for the submarine cable 100 to pass through. In this embodiment, the support frame 322 has four side frames, and four second abutment members 323 are respectively located at the four corners of the four side frames. By setting multiple second abutment members 323, the submarine cable 100 passing through the simulated seabed can be stably abutted against, ensuring stable contact between the submarine cable 100 and the seabed. In this embodiment, the second abutment member 323 is a fisheye bearing.

[0042] Furthermore, this embodiment also provides a submarine cable fatigue testing method, applied to the aforementioned submarine cable fatigue testing apparatus, comprising the following steps: S1. Pass the submarine cable 100 through the shaping channel, and fix both ends of the submarine cable 100 to two fixed tension modules 4 respectively.

[0043] S2. Adjust multiple abutment components to form a shaping channel with the target curvature.

[0044] S3. Drive the bending mechanism 22 to move up and down. The submarine cable 100 in the shaping channel swings back and forth in the height direction of the support 1 with the bending mechanism 22. The submarine cable 100 segment outside the shaping channel is supported by the seabed simulation module 3.

[0045] The submarine cable fatigue testing device also includes a detection module, which comprises strain sensors, fiber optic sensors, ultrasonic detectors, and a data processing unit. The strain sensors are positioned at key stress locations on the surface of the submarine cable 100, such as bending points and end fixings, to collect dynamic stress-strain data. Multiple fiber optic sensors are arranged axially along the submarine cable 100, utilizing the optical signal transmission characteristics to detect micro-strain distribution and crack initiation. The ultrasonic detector is positioned on the side of the submarine cable 100, allowing ultrasonic waves to penetrate and damage the internal conductors and insulation layers. The data processing unit is electrically connected to the strain sensors, fiber optic sensors, and ultrasonic detectors, receiving signals from these sensors in real time, analyzing the data to assess the degree of fatigue damage, determine the amount of damage accumulation, and predict the remaining service life of the submarine cable 100. During the fatigue test of the submarine cable 100, operators use the detection module to perform damage detection.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A fatigue testing device for submarine cables, characterized in that, It includes a support (1), a bending module (2), two seabed simulation modules (3) and two fixed tension modules (4), wherein the bending module (2), the two seabed simulation modules (3) and the two fixed tension modules (4) are all connected to the support (1); The bending module (2) is located between the two fixed tension modules (4), which are used to fix the two ends of the submarine cable (100); a seabed simulation module (3) is provided between each fixed tension module (4) and the bending module (2), which is used to support the submarine cable (100). The bending module (2) includes a drive mechanism (21) and a bending mechanism (22). The drive mechanism (21) is connected to the bracket (1). The drive mechanism (21) is used to drive the bending mechanism (22) to move up and down. The bending mechanism (22) is used to cooperate with the mounting part of the submarine cable (100) and drive it to move up and down. The bending mechanism (22) includes a first mounting frame (221) and multiple abutting components. The output end of the driving mechanism (21) is connected to the first mounting frame (221) for transmission. The multiple abutting components are divided into an upper group and a lower group. The multiple abutting components in the same group are arranged at intervals along the length direction of the bracket (1). The abutting surfaces of the multiple abutting components in the upper group are arranged in sequence to form a downwardly protruding upper constraint arc surface. The abutting surfaces of the multiple abutting components in the lower group are arranged in sequence to form an upwardly protruding lower constraint arc surface. The upper constraint arc surface and the lower constraint arc surface are arranged opposite each other, and a shaping channel for the submarine cable (100) to pass through is defined between them.

2. The submarine cable fatigue testing apparatus according to claim 1, characterized in that, The abutting assembly includes a first abutting member (222), a movable base (223), and a first adjusting member (224). The upper and lower parts of the first mounting bracket (221) are provided with a first channel. The first adjusting member (224) passes through the first channel and can move up and down along the axial direction of the first channel. The end of the first adjusting member (224) near the shaping channel is connected to the movable base (223). The movable base (223) is connected to the first abutting member (222). The abutting surface is provided on the first abutting member (222).

3. The submarine cable fatigue testing apparatus according to claim 2, characterized in that, The first mounting bracket (221) is provided with a plurality of guide grooves, all of which extend along the height direction of the bracket (1) and are arranged with their openings facing each other. The movable base (223) is slidably disposed in the two guide grooves on both sides along the width direction of the bracket (1).

4. The submarine cable fatigue testing apparatus according to claim 3, characterized in that, The abutting component further includes a limiting member (226), which is connected to the movable base (223). The width of the limiting member (226) is greater than the width of the guide groove. The limiting member (226) abuts against the first mounting bracket (221) and is located outside the opening of the guide groove.

5. The submarine cable fatigue testing apparatus according to claim 2, characterized in that, The abutment assembly further includes a second adjusting member (225). A second channel is provided on the movable base (223). The second adjusting member (225) passes through the second channel and can move along the axial direction of the second channel. The end of the second adjusting member (225) near the shaping channel is connected to the first abutment member (222). Each movable base (223) is connected to a plurality of second adjusting members (225). The axes of the plurality of second adjusting members (225) are arranged at an angle. The plurality of second adjusting members (225) are respectively connected to one or more of the first abutment members (222).

6. The submarine cable fatigue testing apparatus according to claim 1, characterized in that, The minimum distance between the upper constraint arc surface and the lower constraint arc surface is equal to the diameter of the submarine cable (100).

7. The submarine cable fatigue testing apparatus according to claim 1, characterized in that, The drive mechanism (21) includes a second mounting bracket (211) and a first drive assembly. The second mounting bracket (211) is disposed on the bracket (1). The output end of the first drive assembly is connected to the first mounting bracket (221) in a transmission manner. The second mounting bracket (211) is also provided with a first guide rail extending along the height direction of the bracket (1). The first mounting bracket (221) is slidably disposed on the first guide rail.

8. The submarine cable fatigue testing apparatus according to any one of claims 1-7, characterized in that, The fixed tensioning module (4) includes a fixing mechanism (41) and a tensioning mechanism (42). The fixing mechanism (41) includes a third mounting bracket (411), which is connected to the support (1) and moves back and forth along the length of the support (1). The third mounting bracket (411) is provided with a fixing member (412) for fixing the submarine cable (100). The tensioning mechanism (42) includes a second driving component, which is connected to the support (1). The output end of the second driving component is connected to the third mounting bracket (411), and the second driving component is used to drive the third mounting bracket (411) to move on the support (1).

9. The submarine cable fatigue testing apparatus according to any one of claims 1-7, characterized in that, The seabed simulation module (3) includes a seabed simulation mechanism (31), which includes a simulated seabed and a third drive component (312). The third drive component (312) is connected to the support (1), and the output end of the third drive component (312) is connected to the simulated seabed for driving the simulated seabed to move up and down along the height direction of the support (1). The simulated seabed is used to support the submarine cable (100).

10. A fatigue testing method for submarine cables, characterized in that, The fatigue testing apparatus for submarine cables (100) according to any one of claims 1-9 comprises the following steps: S1. Pass the submarine cable (100) through the shaping channel, and fix the two ends of the submarine cable (100) to two fixed tension modules (4) respectively. S2. Adjust multiple abutment components to form a shaping channel with the target curvature; S3. Drive the bending mechanism (22) to move up and down. The submarine cable (100) in the shaping channel swings back and forth in the height direction of the support (1) with the bending mechanism (22). The submarine cable (100) segment outside the shaping channel is supported by the seabed simulation module (3).

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