A testing device and method for axial tensile properties of floating wind turbine submarine cables to eliminate installation deviations

Abstract

This invention provides a testing device and method for the axial tensile performance of floating wind turbine submarine cables to eliminate installation deviations, belonging to the field of marine engineering technology. The device includes: a main experimental frame, an actuator, a bearing upper connector, a first joint bearing, a spoke-type force sensor, a second joint bearing, an upper tension clamp, and a lower tension clamp. The spoke-type force sensor is connected at both ends to the bearing upper connector and the bearing lower clamp base via the first and second joint bearings, respectively, forming a double-joint bearing hinge structure connected in series in the force transmission path. During the test, the submarine cable sample is clamped at both ends by the upper and lower tension clamps. The free rotation characteristics of the double-joint bearing hinge structure automatically compensate for installation coaxiality deviations, eliminating off-center loading and additional bending moments, ensuring the accurate application of pure axial tensile load. This invention solves the problem of uneven force distribution caused by installation deviations in submarine cable tensile testing, offering accurate measurements, simple operation, and strong versatility.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering technology, specifically relating to a testing device and method for the axial tensile performance of a floating wind turbine submarine cable to eliminate installation deviations. Background Technology

[0002] Floating wind turbines, as key equipment for developing deep-sea wind energy resources, have received widespread attention in recent years. Within floating wind turbine systems, submarine cables are crucial links connecting the floating platform to subsea power infrastructure. Their structural safety and operational reliability directly affect the stable operation of marine engineering projects. In actual marine environments, submarine cables are often subjected to complex and variable mechanical loads, especially tensile loads. These loads can cause helical contraction or expansion of different structural layers such as the cable's armor and sheath, altering the interlayer contact pressure and friction state. This can lead to localized slippage, wear, and heat accumulation, accelerating material aging, damage, and even fracture. Therefore, conducting axial tensile performance tests on floating wind turbine submarine cables to obtain their true mechanical response data under pure tensile conditions is of great significance for ensuring the operational safety of submarine cables.

[0003] Currently, research on the axial tensile properties of submarine cables relies heavily on finite element numerical simulation. However, submarine cables are complex nonlinear structures made of multiple layers of different materials spirally wound together. The contact and friction mechanisms between the layers are extremely complex. The setting of contact conditions and friction coefficients in finite element simulations is difficult to accurately reflect the actual situation, making it difficult to guarantee the accuracy of the simulation results.

[0004] Axial tensile performance tests on a few submarine cables typically employ large tensile testing machines, using universal clamps or specially designed anchoring heads to hold both ends of the cable. However, submarine cables have large diameters, high stiffness, and complex structures, making it difficult to ensure absolute alignment between the cable's centerline and the testing machine's tensile axis in a laboratory environment. This results in uneven stress on the cable, generating additional bending or torque moments, making it impossible to obtain truly pure axial tensile data. Furthermore, existing testing equipment generally suffers from high costs, complex operating procedures, and long testing cycles.

[0005] In summary, there is an urgent need for a dedicated device and method for testing the axial tensile properties of floating wind turbine submarine cables that can eliminate installation deviations and ensure pure axial load transmission. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned technical problems and provide a testing device and method for the axial tensile performance of floating wind turbine submarine cables that eliminates installation deviations.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A test device for axial tensile performance of floating wind turbine submarine cable to eliminate installation deviation includes: a main test frame, a rigid transition connecting plate, an actuator, a bearing upper connector, a first joint bearing, a spoke-type force sensor, a sensor adapter, a second joint bearing, a bearing lower clamp base, an upper tensile fixture, and a lower tensile fixture.

[0009] The main experimental frame provides support and reaction force foundation for the entire testing system;

[0010] The actuator is fixedly mounted on the main experimental frame via the rigid transition connecting plate;

[0011] The piston rod end of the actuator is connected to the upper bearing connecting piece, and the upper bearing connecting piece is connected to the first joint bearing;

[0012] The upper tension clamp and the lower tension clamp are respectively used to clamp the two ends of the floating wind turbine submarine cable sample. The upper tension clamp is connected to the bearing lower clamp base, and the lower tension clamp is connected to the tooling base through the clamp mounting base plate.

[0013] One end of the spoke-type force sensor is connected to the bearing connector via the first spherical bearing, and the other end of the spoke-type force sensor is connected to the second spherical bearing via the sensor adapter. The second spherical bearing is connected to the bearing lower clamp base.

[0014] The first joint bearing, the spoke-type force sensor, the sensor adapter, and the second joint bearing are connected in series in the force transmission path between the actuator and the upper tension fixture, forming a double joint bearing hinge structure, which is used to automatically compensate for installation coaxiality deviation and eliminate off-center load and additional bending moment during the test.

[0015] Furthermore, both the upper and lower tension clamps are three-lobed structures. The upper tension clamp includes an upper clamp mounting surface, an upper clamp contact surface, and an upper clamp clamping surface. The clamp clamping surface is adjusted by bolt preload to increase the contact friction between the clamp contact surface and the floating wind turbine submarine cable sample.

[0016] Furthermore, a first annular plate is provided at the lower part of the bearing lower clamp base, and the upper clamp mounting surface of the upper tension clamp is connected to the first annular plate by bolts;

[0017] The upper part of the fixture mounting base plate is provided with a second ring plate, and the lower fixture mounting surface of the lower tension fixture is connected to the second ring plate by bolts;

[0018] The lower part of the fixture mounting base plate is provided with a mounting base plate, which is connected to the tooling base by bolts, and the tooling base is fixedly connected to the foundation.

[0019] Furthermore, the bearing connector is provided with a first fork lug and a first pin, and the first fork lug restricts the position of the first joint bearing through the first pin;

[0020] The upper part of the bearing lower clamp base is provided with a second fork lug and a second pin, and the second fork lug restricts the position of the second joint bearing through the second pin.

[0021] Furthermore, the edge of the rigid transition connecting plate is provided with a U-shaped reinforcing surface, and the inside is provided with a bolt slot; the U-shaped reinforcing surface is connected to the crossbeam of the main experimental frame by bolts, and the bolt slot is connected to the cylinder flange of the actuator by bolts.

[0022] Furthermore, the main experimental frame is a high-rigidity portal or four-column frame structure.

[0023] Furthermore, both the first and second joint bearings are fisheye bearings.

[0024] A test method for the above-mentioned floating wind turbine submarine cable axial tensile performance test device for eliminating installation deviation includes the following steps:

[0025] Step 1: Prepare a test device according to the size of the floating wind turbine submarine cable sample, and set the inner diameter of the upper tension clamp and the lower tension clamp to be smaller than the diameter of the floating wind turbine submarine cable sample.

[0026] Step 2: Install both ends of the floating wind turbine cable sample into the upper tension clamp and the lower tension clamp respectively, and connect the test device to the floating wind turbine cable sample as a whole.

[0027] Step 3: Utilizing the double-joint bearing hinge structure composed of the first joint bearing, the spoke-type force sensor, the sensor adapter, and the second joint bearing, and taking advantage of the free rotation characteristics of the double-joint bearing hinge structure, automatic alignment is achieved under the action of initial alignment force to eliminate installation deviation; calibrate the spoke-type force sensor and check the flexibility of the first and second joint bearings.

[0028] Step 4: Activate the actuator to apply a preload to the floating wind turbine cable sample to eliminate the gap in the device and put the sample in a stable initial state. Then, apply a continuous axial tensile load at a set loading rate. During the loading process, the tensile force is monitored in real time by the spoke-type force sensor, and displacement or deformation data is collected synchronously by an external measuring device.

[0029] Step 5: After reaching the preset loading target, turn off the actuator and release the tensile force, and disassemble the tested floating wind turbine submarine cable sample.

[0030] Furthermore, in step two, the length of the floating wind turbine submarine cable sample is greater than five times the length of its armor layer pitch.

[0031] Furthermore, in step four, the preload is less than the elastic limit load of the floating wind turbine submarine cable sample.

[0032] The beneficial effects of this invention are as follows:

[0033] This invention constructs a double-joint bearing hinge structure by sequentially connecting a first joint bearing, a spoke-type force sensor, a sensor adapter, and a second joint bearing in the force transmission path between the actuator and the tensile fixture. This structure can automatically compensate for coaxiality errors generated during installation, effectively eliminate off-center loading and additional bending moments that may occur during the test, and ensure that the axial tensile load is always accurately applied in the axial direction of the coastal cable specimen. This allows for the acquisition of true mechanical response data under pure tensile conditions, overcoming the problems of eccentricity and bending moments caused by installation errors or uneven deformation of the specimen in traditional tensile testing.

[0034] This invention connects a spoke-type force sensor directly in series in the main force path, utilizing its inherent anti-eccentric load characteristics and high precision to ensure the accuracy of load measurement.

[0035] This invention is highly versatile. By replacing the upper and lower tension clamps with different specifications and structures, it can meet the testing requirements of floating wind turbine submarine cable samples with various diameters and armored structure types.

[0036] This invention is safe, simple and quick to operate. Its modular design makes the installation and replacement of the tension clamp very convenient, with a short testing cycle and low operating cost. Attached Figure Description

[0037] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Appendix Figure 2 This is a schematic diagram of the connection between the rigid transition connecting plate and the connecting part on the bearing of the present invention;

[0039] Appendix Figure 3 This is a schematic diagram of the double fisheye bearing hinge of the present invention;

[0040] Appendix Figure 4 This is a schematic diagram of the upper tension clamp and the lower bearing clamp base of the present invention;

[0041] Appendix Figure 5 This is a schematic diagram of the lower tensioning fixture, the fixture mounting base plate, and the tooling base of the present invention.

[0042] In the attached diagram: 1. Main experimental frame; 2. Rigid transition connecting plate; 2-1. U-shaped reinforcing surface; 2-2. Bolt slot; 3. Actuator; 3-1. Cylinder flange; 3-2. Piston rod end flange; 4. Bearing upper connecting piece; 4-1. First fork lug; 4-2. First pin; 5. First spherical bearing; 6. Spoke-type force sensor; 7. Sensor adapter; 8. Second spherical bearing; 9. Bearing lower clamp base; 9-1. 9-2 Second fork lug, 9-3 First cable trough, 9-4 First annular plate, 10 Upper tension clamp, 10-1 Upper clamp mounting surface, 10-2 Upper clamp contact surface, 10-3 Upper clamp clamping surface, 11 Floating wind turbine cable sample, 12 Lower tension clamp, 13 Clamp mounting base plate, 13-1 Second annular plate, 13-2 Second cable trough, 13-3 Mounting base plate, 14 Tooling base. Detailed Implementation

[0043] The present invention will now be further described with reference to the accompanying drawings.

[0044] As attached Figure 1-5 As shown, the present invention provides a floating wind turbine submarine cable axial tensile performance testing device for eliminating installation deviations, comprising: a main test frame 1, a rigid transition connecting plate 2, an actuator 3, a bearing upper connector 4, a first joint bearing 5, a spoke-type force sensor 6, a sensor adapter 7, a second joint bearing 8, a bearing lower clamp base 9, an upper tensile clamp 10, a lower tensile clamp 12, a clamp mounting base plate 13, and a tooling base 14.

[0045] The main experimental frame 1 is a high-rigidity portal or four-column frame structure, providing a stable support and reaction foundation for the entire testing system. The main experimental frame 1 can be made of welded or cast steel, and its rigidity should meet the requirement that the deformation under the maximum tensile load during the test does not affect the test accuracy.

[0046] The rigid transition connecting plate 2 has a U-shaped reinforcing surface 2-1 on its edge, with bolt slots 2-2 inside. The U-shaped reinforcing surface 2-1 has through holes for connection to the crossbeam on the main experimental frame 1 via bolts; the bolt slots 2-2 have through holes for connection to the actuator cylinder flange 3-1 via bolts. The design of the U-shaped reinforcing surface 2-1 significantly improves the bending stiffness and load-bearing capacity of the transition connecting plate, ensuring the rigidity of the connection between the actuator 3 and the main experimental frame 1.

[0047] The actuator 3 is fixedly mounted on the main test frame 1 via a rigid transition connecting plate 2. The actuator 3 can be a hydraulic servo actuator, an electric cylinder, or other form of linear loading actuator, and its loading capacity and stroke are determined according to the ultimate tensile load and elongation of the submarine cable sample to be tested.

[0048] The bearing upper connector 4 is connected to the actuator piston rod end flange 3-2 by bolts. The bearing upper connector 4 is provided with a first fork lug 4-1 and a first pin 4-2. The first fork lug 4-1 restricts the position of the first spherical bearing 5 through the first pin 4-2. The first fork lug 4-1 passes through the rod end annular hole of the first spherical bearing 5 through the first pin 4-2 to restrict the axial and radial position of the first spherical bearing 5. At the same time, the spherical pair of the first spherical bearing 5 itself can rotate freely, thereby realizing adaptive adjustment of the spatial angle.

[0049] One end of the first joint bearing 5 is connected to the first fork lug 4-1 of the bearing connector 4, and the other end is connected to the spoke-type force sensor 6. Specifically, the spoke-type force sensor 6 is threadedly connected to the first joint bearing 5 through its central threaded hole.

[0050] The spoke-type force sensor 6 is directly connected in series in the main force path for real-time measurement of the tensile load applied to the submarine cable sample. The spoke-type force sensor 6 has inherent resistance to off-center loading, maintaining high measurement accuracy even under slight off-center loading. This, combined with the double-joint bearing hinge structure of this invention, ensures the accuracy of load measurement.

[0051] One end of the sensor adapter 7 is connected to the spoke-type force sensor 6, and the other end is connected to the second joint bearing 8. The specific shape and size of the sensor adapter 7 are determined according to the connection interface between the spoke-type force sensor 6 and the second joint bearing 8. One end of the sensor adapter (7) is provided with a connection part that matches the threaded interface of the spoke-type force sensor (6), and the other end is provided with a connection part that matches the rod end of the second joint bearing (8), which is used to realize the interface conversion and rigid connection between the spoke-type force sensor (6) and the second joint bearing (8).

[0052] One end of the second joint bearing 8 is connected to the spoke-type force sensor 6 via the sensor adapter 7, and the other end is connected to the bearing lower clamp base 9.

[0053] The upper part of the bearing lower clamp base 9 is provided with a second fork lug 9-1 and a second pin 9-2, the middle part is a first submarine cable groove 9-3, and the lower part is a first annular plate 9-4 with a through hole. The second fork lug 9-1 restricts the position of the second joint bearing 8 through the second pin 9-2. The first submarine cable groove 9-3 is a semi-circular groove used to accommodate the upper part of the submarine cable sample.

[0054] Reference Figure 4 and Figure 5The upper tension clamp 10 has a three-part structure, including an upper clamp mounting surface 10-1, an upper clamp contact surface 10-2, and an upper clamp clamping surface 10-3. The upper clamp clamping surface 10-3 is adjusted by the bolt preload to increase the contact friction between the upper clamp contact surface 10-2 and the floating wind turbine submarine cable sample 11. The first annular plate 9-4 is connected to the upper clamp mounting surface 10-1 by bolts.

[0055] The lower tension clamp 12 has the same structural dimensions as the upper tension clamp 10, including the lower clamp mounting surface, the lower clamp contact surface, and the lower clamp clamping surface, which will not be described in detail here. The second annular plate 13-1 is connected to the lower clamp mounting surface by bolts.

[0056] The three-lobed structure refers to the clamp being divided into three independent lobes along the circumference, with gaps between each lobe. The clamping surface 10-3 of the upper clamp is provided with bolt holes. By tightening the bolts, the gaps between the lobes can be adjusted, thereby changing the contact pressure between the contact surface 10-2 of the upper clamp and the submarine cable sample 11.

[0057] As the bolt preload increases, the segments contract inward, increasing the normal pressure between the upper clamp contact surface 10-2 and the outer surface of the submarine cable sample 11. According to Coulomb's law of friction, the contact friction force increases accordingly. When the contact friction force is sufficient to resist the tensile load, the submarine cable sample 11 will not slip during the tensile process.

[0058] The clamping force of the three-lobed structure is evenly distributed in three areas around the sample, avoiding local stress concentration that may be caused by traditional integral clamps; by adjusting the bolt preload, it can accommodate submarine cable samples of different diameters within a certain range; the three-lobed structure facilitates sample installation and disassembly.

[0059] The clamping principle of the lower tension clamp 12 is exactly the same as that of the upper tension clamp 10, and will not be described again here.

[0060] The upper part of the fixture mounting base plate 13 is the second annular plate 13-1, the middle part is the second submarine cable groove 13-2, and the lower part is the mounting base plate 13-3. The second submarine cable groove 13-2 is a semi-circular groove, which corresponds vertically to the first submarine cable groove 9-3 of the bearing lower clamp base 9, forming a complete circular channel to accommodate the submarine cable sample.

[0061] The tooling base 14 is fixed to the foundation by means of anchor bolts or other methods. The mounting base plate 13-3 is connected to the tooling base 14 by bolts.

[0062] The materials used for the above components are preferably 45# steel or higher strength steel to ensure the strength, rigidity and durability of the fixture.

[0063] In a preferred embodiment, both the first joint bearing 5 and the second joint bearing 8 are fisheye bearings.

[0064] Example 1:

[0065] Reference Figure 3 The first joint bearing 5, the spoke-type force sensor 6, the sensor adapter 7, and the second joint bearing 8 together constitute a complete double joint bearing hinge force transmission chain.

[0066] During installation, due to manufacturing errors in the main experimental frame 1, installation errors in the actuator 3, and the bending of the submarine cable sample 11 itself, a certain degree of coaxiality deviation inevitably exists between the loading axis of the actuator 3 and the centerline of the submarine cable sample 11. Under traditional rigid connection methods, this deviation will cause the submarine cable sample 11 to be subjected to additional bending moment, making it impossible to obtain pure axial tensile data.

[0067] In this embodiment, the first joint bearing 5 and the second joint bearing 8 each provide a rotational degree of freedom in one direction. When there is an angular deviation between the loading axis and the sample axis, the two joint bearings can automatically rotate to adapt to this deviation, automatically adjusting the force transmission path to be consistent with the sample axis. Simultaneously, a spoke-type force sensor 6 is connected in series between the two joint bearings, and its anti-eccentric loading characteristics further ensure the accuracy of load measurement.

[0068] Therefore, the double joint bearing hinge structure can automatically compensate for the coaxiality error generated during installation without manual intervention, effectively eliminate the off-center load and additional bending moment that may occur during the test, and ensure that the axial tensile load is always accurately applied in the axial direction of the coastal cable specimen, thereby obtaining the true mechanical response data under pure tensile conditions.

[0069] Example 2:

[0070] The following section describes in detail the specific operating procedures for the axial tensile performance test of the floating wind turbine submarine cable, using the aforementioned test apparatus.

[0071] Step 1: Sample and apparatus preparation:

[0072] Based on the known dimensions of the floating wind turbine cable specimen 11 from the actual test, suitable test apparatus components are prepared or selected. Specifically, an upper tension clamp 10 and a lower tension clamp 12 with inner diameters smaller than the diameter of the floating wind turbine cable specimen 11 are selected to ensure that the clamps can apply sufficient clamping force to the specimen. Simultaneously, bearing lower clamp base 9 and clamp mounting base plate 13 with corresponding dimensions for the first cable groove 9-3 and the second cable groove 13-2 are selected according to the specimen diameter.

[0073] Check that all components are in good condition and clean oil and impurities from all connecting and contact surfaces.

[0074] Step 2: Sample Installation

[0075] The two ends of the floating wind turbine submarine cable sample 11 are respectively installed in the upper tension clamp 10 and the lower tension clamp 12. During installation, ensure that the length of the sample extending into the clamps at both ends meets the clamping requirements, generally not less than two-thirds of the clamp height.

[0076] Tighten the bolts on the clamping surfaces 10-3 of the upper clamp and the lower clamp to generate sufficient contact friction between the clamping surfaces and the sample surface. The tightening torque should be moderate, ensuring sufficient friction to prevent the sample from slipping out, while avoiding excessive clamping force that could damage the sample surface.

[0077] The upper clamp mounting surface 10-1 of the upper tension clamp 10 is bolted to the first annular plate 9-4 of the lower bearing clamp base 9. The lower clamp mounting surface of the lower tension clamp 12 is bolted to the second annular plate 13-1 of the clamp mounting base plate 13.

[0078] The mounting base plate 13-3 of the fixture mounting base plate 13 is connected to the tooling base 14 by bolts, and the tooling base 14 is fixed to the foundation by anchor bolts.

[0079] The test device was installed and connected as a whole with the floating wind turbine submarine cable sample 11.

[0080] Preferably, the length of the floating wind turbine submarine cable sample 11 should be greater than five times the length of its armor layer pitch to ensure that the test section has representative mechanical properties and eliminate the influence of end effect.

[0081] Step 3: Centering and Calibration:

[0082] A double-joint bearing hinge structure, consisting of a first joint bearing 5, a spoke-type force sensor 6, a sensor adapter 7, and a second joint bearing 8, utilizes the free rotation characteristic of this structure to achieve automatic alignment under initial alignment force, thus eliminating installation deviations. Operators can confirm the alignment effect through observation and necessary measurement.

[0083] Calibrate the spoke-type force sensor 6 to ensure its initial reading is accurate. Specifically, zero the reading of the spoke-type force sensor 6 without applying any load.

[0084] Check the flexibility of the first joint bearing 5 and the second joint bearing 8 by manually rotating the joint bearings to ensure that they rotate smoothly without any jamming.

[0085] Step 4: Loading and Data Acquisition

[0086] Actuator 3 is activated to apply a small preload to the floating wind turbine cable specimen 11 to eliminate gaps between the components of the device and to bring the floating wind turbine cable specimen 11 into a stable initial state. Preferably, the preload should be less than the elastic limit load of the floating wind turbine cable specimen 11 to ensure that the specimen does not undergo plastic deformation during the pre-tightening stage.

[0087] After the system stabilizes, apply a continuous axial tensile load at the set loading rate. The loading rate is set according to relevant test standards or actual requirements.

[0088] Throughout the loading process, the spoke-type force sensor 6 monitors the tensile force in real time and simultaneously acquires displacement or deformation data via an external non-contact displacement gauge. The data acquisition system should have a sufficient sampling frequency to capture the details of the mechanical response during the loading process.

[0089] Step 5: Unloading and Disassembly

[0090] After the preset loading target is reached (such as reaching the predetermined load value, the specimen breaking, or reaching the predetermined elongation), the actuator 3 is turned off, and the tensile force is released slowly. The release speed should be moderate to avoid sudden unloading that could impact the equipment and the specimen.

[0091] Disassemble the tested floating wind turbine submarine cable sample 11. First, loosen the clamping bolts of the upper tension clamp 10 and the lower tension clamp 12, remove the sample, and then disassemble each connecting bolt in sequence to separate the components.

[0092] Perform necessary cleaning, inspection, and maintenance on the test equipment in preparation for future use.

[0093] When it is necessary to test floating wind turbine submarine cable samples of different diameters, adjustments can be made in the following ways:

[0094] (1) Replace the upper tension clamp 10 and the lower tension clamp 12 with the corresponding inner diameter. Since the upper tension clamp 10 and the lower tension clamp 12 are connected to the bearing lower clamp base 9 and the clamp mounting base plate 13 respectively by bolts, the replacement operation is very simple.

[0095] (2) Replace the bearing lower clamp base 9 and the clamp mounting base plate 13 with the corresponding dimensions of the first submarine cable groove 9-3 and the second submarine cable groove 13-2 to ensure that the submarine cable sample can pass through smoothly.

[0096] Other components (main experimental frame 1, rigid transition connecting plate 2, actuator 3, bearing upper connecting part 4, first joint bearing 5, spoke-type force sensor 6, sensor adapter 7, second joint bearing 8, tooling base 14) do not need to be replaced and have good versatility.

[0097] Therefore, the present invention can meet the testing requirements of floating wind turbine submarine cable samples with various diameters and armored structure types.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A testing device for the axial tensile properties of a floating wind turbine submarine cable to eliminate installation deviations, characterized in that, include: Main experimental frame (1), rigid transition connecting plate (2), actuator (3), bearing upper connecting piece (4), first joint bearing (5), spoke type force sensor (6), sensor adapter (7), second joint bearing (8), bearing lower clamp base (9), upper tension clamp (10) and lower tension clamp (12); The main experimental frame (1) provides support and reaction force foundation for the entire testing system; The actuator (3) is fixedly installed on the main experimental frame (1) via the rigid transition connecting plate (2); The piston rod end of the actuator (3) is connected to the bearing upper connector (4), and the bearing upper connector (4) is connected to the first joint bearing (5); The upper tension clamp (10) and the lower tension clamp (12) are used to clamp the two ends of the floating wind turbine submarine cable sample (11), respectively. The upper tension clamp (10) is connected to the bearing lower clamp base (9), and the lower tension clamp (12) is connected to the tooling base (14) through the clamp mounting base plate (13). One end of the spoke-type force sensor (6) is connected to the bearing upper connector (4) through the first joint bearing (5), and the other end of the spoke-type force sensor (6) is connected to the second joint bearing (8) through the sensor adapter (7). The second joint bearing (8) is connected to the bearing lower clamp base (9). The first joint bearing (5), the spoke-type force sensor (6), the sensor adapter (7), and the second joint bearing (8) are connected in series in the force transmission path between the actuator (3) and the upper tension clamp (10) to form a double joint bearing hinge structure, which is used to automatically compensate for the installation coaxiality deviation and eliminate the off-center load and additional bending moment during the test.

2. The axial tensile performance testing device for floating wind turbine submarine cables to eliminate installation deviations according to claim 1, characterized in that, Both the upper tension clamp (10) and the lower tension clamp (12) are three-lobed structures. The upper tension clamp (10) includes an upper clamp mounting surface (10-1), an upper clamp contact surface (10-2), and an upper clamp clamping surface (10-3). The clamp clamping surface is adjusted by the bolt preload to increase the contact friction between the clamp contact surface and the floating wind turbine submarine cable sample (11).

3. The axial tensile performance testing device for floating wind turbine submarine cables to eliminate installation deviations according to claim 2, characterized in that, The lower part of the bearing lower clamp base (9) is provided with a first ring plate (9-4), and the upper clamp mounting surface (10-1) of the upper tension clamp (10) is connected to the first ring plate (9-4) by bolts; The upper part of the fixture mounting base plate (13) is provided with a second ring plate (13-1), and the lower fixture mounting surface of the lower tension fixture (12) is connected to the second ring plate (13-1) by bolts; The lower part of the fixture mounting base plate (13) is provided with a mounting base plate (13-3), the mounting base plate (13-3) is connected to the tooling base (14) by bolts, and the tooling base (14) is fixedly connected to the foundation.

4. The axial tensile performance testing device for floating wind turbine submarine cables to eliminate installation deviations according to claim 1, characterized in that, The bearing upper connector (4) is provided with a first fork lug (4-1) and a first pin (4-2). The first fork lug (4-1) restricts the position of the first joint bearing (5) through the first pin (4-2). The upper part of the bearing lower clamp base (9) is provided with a second fork lug (9-1) and a second pin (9-2). The second fork lug (9-1) restricts the position of the second joint bearing (8) through the second pin (9-2).

5. The axial tensile performance testing device for floating wind turbine submarine cables to eliminate installation deviations according to claim 1, characterized in that, The edge of the rigid transition connecting plate (2) is provided with a U-shaped reinforcing surface (2-1) and a bolt slot (2-2) is provided inside; the U-shaped reinforcing surface (2-1) is connected to the crossbeam of the main experimental frame (1) by bolts, and the bolt slot (2-2) is connected to the cylinder flange (3-1) of the actuator (3) by bolts.

6. The axial tensile performance testing device for floating wind turbine submarine cables to eliminate installation deviations according to claim 1, characterized in that, The main experimental frame is a high-rigidity portal or four-column frame structure.

7. The axial tensile performance testing device for floating wind turbine submarine cables to eliminate installation deviations according to claim 1, characterized in that, Both the first joint bearing (5) and the second joint bearing (8) are fisheye bearings.

8. A test method applicable to the floating wind turbine submarine cable axial tensile performance test apparatus for eliminating installation deviations as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Prepare a test device according to the size of the floating wind turbine submarine cable sample (11), and set the inner diameter of the upper tension clamp (10) and the lower tension clamp (12) to be smaller than the diameter of the floating wind turbine submarine cable sample (11). Step 2: Install both ends of the floating wind turbine cable sample (11) into the upper tension clamp (10) and the lower tension clamp (12) respectively, and connect the test device to the floating wind turbine cable sample (11) as a whole. Step 3: Using the double joint bearing hinge structure composed of the first joint bearing (5), the spoke-type force sensor (6), the sensor adapter (7), and the second joint bearing (8), the free rotation characteristics of the double joint bearing hinge structure are utilized to achieve automatic alignment under the action of the initial alignment force to eliminate installation deviation; the spoke-type force sensor (6) is calibrated and the flexibility of the first joint bearing (5) and the second joint bearing (8) is checked. Step 4: Start the actuator (3) to apply a preload to the floating wind turbine cable sample (11) to eliminate the gap between the devices and put the sample in a stable initial state. Then apply a continuous axial tensile load at a set loading rate. During the loading process, monitor the tensile force in real time through the spoke-type force sensor (6) and collect displacement or deformation data synchronously through an external measuring device. Step 5: After reaching the preset loading target, turn off the actuator (3) and release the tensile force, and disassemble the tested floating wind turbine submarine cable sample (11).

9. The test method of the floating wind turbine submarine cable axial tensile performance test device for eliminating installation deviations according to claim 8, characterized in that, In step two, the length of the floating wind turbine submarine cable sample (11) is greater than five times the length of its armor layer pitch.

10. The test method of the floating wind turbine submarine cable axial tensile performance test device for eliminating installation deviations according to claim 8, characterized in that, In step four, the preload is less than the elastic limit load of the floating wind turbine submarine cable sample (11).

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