Mooring device for tension leg platform pool test and test method

Abstract

The invention provides a mooring device for a tension leg platform pool test and a test method. The device comprises a first mooring rope, an extension spring and a second mooring rope which are connected in sequence, and the second mooring rope is connected with a tensioning mechanism; the specification of the cable meets the conditions that A is the sectional area of the cable, k is the safety coefficient, Tmax is the maximum expected tension, sigmaallow is the allowable stress of a cable material, d is the diameter of the cable, L is the effective stress length of the cable, R is a judgment threshold value, Ks is the rigidity of an extension spring, E is the elastic modulus of the cable material, and model selection is conducted on the cable according to the target tension force range; the system equivalent stiffness Ktot in the test is ensured to be dominated by the extension spring, the contribution of the cable stiffness to deformation can be ignored, and the accuracy of equivalent stiffness control of the pool test and the repeatability of the test are improved.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering technology, specifically relating to a mooring device and testing method for tension leg platform pool tests. Background Technology

[0002] Tension leg platforms are structures consisting of multiple tension legs that anchor a floating platform to the seabed via a mooring system. They maintain a stable floating state by applying tension to the platform model. This unique kinematic characteristic gives them irreplaceable advantages in offshore oil and gas extraction applications, but it also presents complex challenges in design, installation, and maintenance. Tank testing of tension leg platforms is a crucial bridge connecting theoretical design, numerical simulation, and real-world marine performance. Engineers use meticulously designed scaled-down models, advanced marine engineering tank facilities, and rigorous testing procedures to simulate and control the mooring tension of the tension leg platform model. This allows them to study and analyze the forces and dynamic responses of the offshore platform under different operating conditions, gain a deeper understanding of the hydrodynamic behavior of tension leg platforms in complex marine environments, and accurately measure their kinematic performance and key tendon tension. This provides indispensable physical evidence for optimized design, safety verification, and ultimately successful deployment.

[0003] Existing mooring devices used in pool tests face several technical challenges. Firstly, tension adjustment and simulation typically utilize high-strength steel cables, spring steel straps, or rigid rods. Weights or spring systems are connected to the bottom of the model via pulley systems to apply and maintain the required pretension. These devices suffer from the following drawbacks when adjusting tension: the stiffness of high-strength steel cables exhibits non-linear characteristics with tension changes, leading to significant deviations between simulation results and the dynamic response of real mooring systems; the loading-unloading curve of spring steel straps exhibits hysteresis, resulting in a delayed tension adjustment response, making it difficult to accurately simulate the dynamic marine environment, such as the effects of tides, waves, and wind on the platform's stress conditions during testing. The existing mooring system suffers from several drawbacks. First, the platform's tension cannot be adjusted to the optimal state in a timely manner. Second, rigid members lack flexibility, failing to simulate the elastic deformation of a real mooring system, especially under wave excitation, potentially underestimating the dynamic response. Furthermore, precise adjustment of length and hinge points is required, resulting in poor adaptability under complex conditions of multi-degree-of-freedom motion. Rigid connections are also susceptible to structural impacts from sudden loads, damaging the model or test equipment. Third, the existing mooring system is a static adjustment system, which cannot respond promptly to changes in platform tension in the simulated marine environment. This prevents the platform's tension from being adjusted to the optimal state during testing, affecting the realism and accuracy of the experiment. Fourth, the existing system lacks integrated real-time monitoring and automatic feedback control, lacking the ability to perceive and precisely adjust tension changes in real time. During testing, personnel typically cannot obtain accurate tension data in real time, nor can they automatically adjust the tension based on the test data, significantly compromising the reliability and accuracy of the test data. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a mooring device and testing method for tension leg platform pool tests. By rationally selecting the specifications of the cables, the designed pool test mooring device, composed of cables and tension springs, can accurately simulate and reproduce the stress conditions of a real tension leg platform mooring device in a marine environment. This solves the problems of insufficient tension adjustment accuracy and poor dynamic response capability in existing technologies, achieving precise tensioning of the tension leg platform model and enabling dynamic adjustment according to test requirements to meet the stress requirements under different working conditions.

[0005] The present invention discloses a mooring device for a tension leg platform water tank test, comprising a first mooring cable, a tension spring, and a second mooring cable connected in sequence, wherein the second mooring cable is connected to a tensioning mechanism;

[0006] The specifications of the first mooring cable and the second mooring cable meet the requirements. and, A is the cross-sectional area of ​​the cable, k is the safety factor, and T is the cross-sectional area of ​​the cable. max For the maximum expected tensile force, σ allow Let d be the allowable stress of the cable material, d be the cable diameter, L be the effective stress-bearing length of the cable, R be the judgment threshold, and K be the allowable stress of the cable material. s E represents the stiffness of the tension spring, and E represents the elastic modulus of the cable material.

[0007] This invention ensures that only the tension spring participates in deformation during testing, meaning the cable stiffness is negligible with respect to the system's equivalent stiffness. The cable is selected based on the target tension range, and its specifications are determined according to the maximum expected tensile force T. max According to the formula and, The calculated value can be approximated by the system's equivalent stiffness K. tot With the tension spring dominating the deformation, the contribution of cable stiffness to deformation is negligible, thus ensuring that the deformation in the test is borne solely by the tension spring, improving the accuracy of equivalent stiffness control and the repeatability of the test in the water tank.

[0008] Furthermore, the stiffness Ks of the tension spring satisfies the following conditions: ΔT is the target tension force change, and Δx is the allowable elongation. This ensures that the stiffness of the tension spring remains within the tested tension force range without failure.

[0009] Furthermore, it also includes a first pulley on the first fixed plate and a second pulley on the second fixed plate, the second mooring cable being wound around the first and second pulleys and connected to the tensioning mechanism, and the first and second fixed plates being detachably connected to the test water tank.

[0010] The installation positions of the first and second fixing plates on the test pool are flexibly determined according to the test plan, and the first and second pulleys are set to guide the mooring cable. The direction of the tension force is accurately simulated and controlled for different tension force test plans.

[0011] Furthermore, the position of the first pulley on the first fixed plate is adjustable; and / or, the position of the second pulley on the second fixed plate is adjustable.

[0012] The direction of the tension force can be adjusted within a small range by adjusting the positions of the first pulley and the second pulley on the first fixed plate and the second fixed plate, either individually or in combination.

[0013] Furthermore, the first mooring rope is provided with a first connector at different lengths, and the first connector is connected to the tension spring; and / or, the second mooring rope is provided with a second connector at different lengths, and the second connector is connected to the tension spring.

[0014] By adjusting the installation positions of the tension springs on the first and second mooring ropes individually or in combination, the dynamic response characteristics and overall stiffness distribution of different tensioning systems can be simulated.

[0015] Furthermore, it also includes a platform connection mechanism, which comprises a first rotary shackle, a tension sensor, and a second rotary shackle connected in sequence, the second rotary shackle being connected to the first mooring cable.

[0016] The tension sensor is connected to the first mooring cable via a rotatable shackle to reduce interference and deviation caused by cable rotation in the tension simulation, and the tension sensor records the changes in tension in the mooring device in real time.

[0017] Furthermore, the tensioning mechanism includes a cable drum and a servo motor. The second mooring cable is connected to the cable drum, and the output of the servo motor drives the cable drum to rotate for precise simulation and control of different tension force test schemes.

[0018] Furthermore, it also includes a control unit, which is used to monitor the tension sensor and control the servo motor in real time.

[0019] The present invention also provides a test method for a mooring device used in a tension leg platform tank test, comprising the following steps:

[0020] Based on the design scheme of the tension leg platform, establish a scaled-down model of a certain proportion, select a suitable test pool, and fabricate the platform model.

[0021] The connection positions of the first fixing plate and the second fixing plate in the test water tank are determined according to the design scheme.

[0022] Select the first mooring cable, tension spring, and second mooring cable according to the design scheme;

[0023] The platform model's mooring point is connected to the first swivel shackle;

[0024] Start the control unit to conduct a water tank test.

[0025] Furthermore, the method includes the steps of replacing the first mooring rope with a different specification; and / or replacing the second mooring rope with a different specification; and / or replacing the tension spring with a different specification; and / or adjusting the position of the first fixing plate; and / or adjusting the position of the second fixing plate; and / or adjusting the position of the first pulley on the first fixing plate; and / or adjusting the position of the second pulley on the second fixing plate; and / or connecting the tension spring to the first connector at different lengths of the first mooring rope; and / or connecting the tension spring to the second connector at different lengths of the second mooring rope.

[0026] The present invention has the following beneficial effects:

[0027] 1) This invention improves the equivalence of stiffness control in water tank tests by selecting a cable with a critical diameter that meets the tensile strength requirements, thereby enabling the test deformation to be borne solely by a tension spring that meets the test conditions.

[0028] 2) This invention guides the mooring cable through the first pulley on the first fixed plate and the second pulley on the second fixed plate. Combined with pulleys, tension sensors and servo motors, the magnitude and direction of the tension force are accurately simulated and controlled. This ensures that after the cable is guided by the first and second pulleys, the direction of the force is consistent with the direction of the force at the mooring point of the platform model, thereby reducing additional bending moments and unnecessary lateral forces, and improving the accuracy and repeatability of the tension force simulation.

[0029] 3) This invention determines the number of the first and second fixed plates and their positions in the test pool through experimental design. It can accommodate different types of tension leg platforms, such as three-legged or four-legged platforms. By adjusting the positions of the first and second fixed plates, the first pulley on the first fixed plate, and the second pulley on the second fixed plate, the direction of the tension force can be adjusted and controlled within a large or small range to adapt to changes in platform size, cable entry angle, and pool bank space conditions. By adjusting the connection positions of the tension springs with the first and second mooring ropes, the dynamic response characteristics and overall stiffness distribution of different tensioning systems can be simulated. The above design can be used for multi-scheme comparison in the exploration phase and has high applicability in scientific research and teaching scenarios that require frequent changes to platform models or multiple sets of experiments.

[0030] 4) This invention uses a control unit combined with a tension sensor and a servo motor to monitor and control the tension force in real time, and has good dynamic monitoring and control functions. Attached Figure Description

[0031] Figure 1 This is a front view of the overall layout of the test pool for a mooring device used in tension leg platform pool testing according to some embodiments of the present invention.

[0032] Figure 2 This is a top view of the overall layout of the test pool for a mooring device used in tension leg platform water tank tests according to some embodiments of the present invention.

[0033] Figure 3 This is a partially enlarged front view of the overall layout of the test pool for a mooring device used in tension leg platform pool tests according to some embodiments of the present invention.

[0034] Figure 4 This is a partially enlarged front view of the overall layout of the test pool for a mooring device used in tension leg platform pool tests according to some embodiments of the present invention.

[0035] Figure 5 This is a front view of the fixing mechanism of a mooring device for a tension leg platform water tank test according to some embodiments of the present invention.

[0036] Figure 6 This is a three-dimensional schematic diagram of the tensioning mechanism of a mooring device for a tension leg platform water tank test provided in some embodiments of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100 mooring devices, 200 test water tanks, 300 platform models.

[0039] 110 Platform connecting mechanism; 111 First swivel shackle; 112 Tension sensor; 113 Second swivel shackle; 114 First mooring cable; 115 Tension spring; 116 Second mooring cable.

[0040] 120 Fixed mechanism, 121 First fixed plate, 122 First pulley,

[0041] 130 Tensioning mechanism, 131 Second fixed plate, 132 Second pulley, 133 Cable drum, 134 Servo motor, 135 Coupling. Detailed Implementation

[0042] To more clearly and completely describe the technical solution of the present invention, the present invention will be further described in detail below through specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. Various changes can be made within the scope of the claims of the present invention.

[0043] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element present. The terms "set," "connect," and "install" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "and / or" includes any and all combinations of one or more of the associated listed items. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0044] Example 1

[0045] like Figure 1 As shown, the present invention provides a mooring device 100 for a tension leg platform water tank test. The mooring device 100 is disposed in the test water tank 200 and connected to the platform model 300. Figure 2 As shown, the mooring device 100 adopts a three-point mooring arrangement, with three sets of platform connection mechanisms 110, fixing mechanisms 120, and tensioning mechanisms 130 arranged at three symmetrical positions on the platform model 300. Specifically, as shown... Figure 4 As shown, the platform connection mechanism 110 includes a first rotary shackle 111, a tension sensor 112, a second rotary shackle 113, a first mooring cable 114, a tension spring 115, and a second mooring cable 116 connected in sequence; the first rotary shackle 111 connects to the mooring point of the platform model 300. Figure 5 As shown, the fixing mechanism 120 includes a first fixing plate 121 and a first pulley 122 disposed on the first fixing plate 121; as Figure 6 As shown, the tensioning mechanism 130 includes a second fixed plate 131, a second pulley 132, a cable drum 133, and a servo motor 134. The second pulley 132 is mounted on the second fixed plate 131. Figure 3-6As shown, the second mooring cable 116 is wound around the first pulley 122 and the second pulley 132 and then connected to the cable drum 133. The output of the servo motor 134 drives the cable drum 133 to rotate. The tension sensor 112, the servo motor 134 and the control unit are connected. The control unit monitors the output power of the tension sensor 112 and the servo motor 134 in real time to accurately simulate and control the magnitude and direction of the tension force. The pulleys are arranged in equidistant triangles according to the model position. The first fixing plate 121 is fixed to the bottom of the test pool 200 with bolts. Installation can be completed by manual alignment and tightening. The positions of the first fixing plate 121 and the second fixing plate 131 can be flexibly determined according to the test plan to adapt to changes in different platform dimensions, cable entry angles and pool bank space conditions. The specific position is determined to ensure that after the cable is guided by the first pulley 122 and the second pulley 132, its force direction is consistent with the force direction of the platform model mooring point, thereby reducing additional bending moment and unnecessary lateral force, and improving the accuracy and repeatability of tension force simulation. The installation height and horizontal position of the first pulley 122 and the second pulley 132 can be adjusted according to the platform deck height, the distance from the cable entry point to the bottom of the pool, and the model scale to ensure that the mooring cable maintains a reasonable entry angle before entering the water, simulating the mooring force path under real sea conditions. During the test preparation phase, the actual tension of the cable is measured using a tension sensor, and the cable drum is adjusted once using a servo motor to reach the predetermined tension value. After adjustment, the drum position is locked, and the tension is not actively changed during the test to ensure the stability of the loading conditions. This arrangement allows for quick and accurate setting of the required initial tension at the start of the test and maintains a constant force state throughout the test, thereby improving the comparability of data and the reliability of test results.

[0046] In this embodiment, the tension spring has a stiffness K of 115. s The target tension change ΔT and allowable elongation Δx in the test plan are calculated according to... Calculations determine that, to ensure that only the tension spring 115 participates in deformation during the test, i.e., the cable stiffness is negligible with respect to the system's equivalent stiffness, the following stiffness criteria must be met simultaneously: the cable diameter and material are based on the maximum expected tensile force T. max According to the formula Calculation selection, A is the cross-sectional area of ​​the cable, σ allow The allowable stress of the cable material; the axial stiffness K of the cable. c Through formula Calculate, where E is the elastic modulus of the cable material, d is the cable diameter, and L is the effective force-bearing length of the cable. In a series system consisting of a cable and a tension spring, the axial stiffness K of the cable is... c With spring stiffness K s The ratio must satisfy K c ≥RKs The system's equivalent stiffness K can be approximated. tot Dominated by the tension spring, i.e., K tot ≈K s The contribution of cable stiffness to deformation is negligible, simulating the mechanical response characteristics of mooring cables under different working conditions. Corrections are made based on platform dimensions and test scale. In the formula, R is the judgment threshold, ranging from 10 to 50. In static or quasi-static tests, R is often taken as 10; for higher accuracy, R can be taken as 50. Therefore, to ensure that only the tension spring 115 bears the test deformation, the cable diameter must meet the following requirements. Based on the above selection and stiffness assessment, the mooring device 100 selects a cable with a critical diameter that meets the tensile strength requirements. This ensures that deformation during the test is primarily borne by the cable spring 115, improving the accuracy of equivalent stiffness control and test repeatability in the pool test. Specifically, the tension leg platform model test scale λ = 1:50, and the actual platform mooring pretension T... s0 =150kN, peak tension is T s1 =800kN, according to Froude's similarity law, the cable pretension T of the model platform is... m0 =T s0 ·λ 2 =60N, peak tension T m1 =T s1 ·λ 2 = 320N. Assuming the expected maximum elongation of the spring, Δx, is 0.05m, then the spring stiffness K... s Through formula The calculated stiffness is 5200 N / m. To ensure safety, the safety factor for the tension spring is between 1.1 and 1.5. In this embodiment, the safety factor is 1.2, and a tension spring with a stiffness of 6200 N / m is ultimately selected. The cable cross-sectional area A must meet the tensile strength requirements, and the selected material has an allowable stress σ. allow＝ For a 180 MPa steel cable, the safety factor k ranges from 3.0 to 4.0. In this embodiment, the safety factor k is 3.0. The cable cross-sectional area is determined using the formula... The calculation result is 0.53 × 10⁻⁶. -6 m 2 The corresponding diameter is approximately 1.9 mm. To ensure that only the spring participates in deformation during the test, the cable diameter also needs to be determined. The effective load-bearing length L of the cable is taken as 5m, the judgment threshold R is taken as 50, and the spring stiffness K is taken as... s Taking 5200 N / m and the elastic modulus E of the cable material as 200 GPa, the critical diameter d of the cable is found to be ≥2.9 mm. In summary, in this embodiment, a 3 mm diameter stainless steel cable is selected to meet the test performance requirements and effectively simulate mechanical response characteristics.

[0047] Servo motor 134 is a 400W DC motor. The PLC program built into the control unit adjusts and controls servo motor 134 with a resolution of 0.1N. The control unit can adjust servo motor 134 to automatically adjust the tension output according to the motion state of the platform model and the changes in cable tension during the test. Especially under dynamic load changes such as simulating wind, wave and current coupling, hydrodynamic disturbance, and sudden changes in platform attitude, servo motor 134 can quickly respond and adjust the cable length after receiving the control unit command, thereby dynamically controlling the tension of each cable. This significantly improves the adaptability and adjustment stability of the mooring system to dynamic environmental changes, and avoids model drift, tilting or even damage caused by excessively loose or tight cables. It is particularly effective in simulating extreme sea conditions, swell excitation or unsteady platform motion, and greatly enhances the realism of the simulation test and the reliability of the data.

[0048] To adapt to changes in experimental scale, such as when conducting large-scale 1:10 experiments, the changes in model parameters can be matched by replacing the first mooring rope 114 and the second mooring rope 116 with different diameters, using tension springs with greater stiffness, and increasing the power level of the servo motor 134. The entire device does not need to be replaced; only some key components need to be adjusted or replaced to complete the system modification, achieving a wider range of tension adjustment and faster response capabilities. This meets the experimental needs of different scales and complexities, and has broad applicability and scalability.

[0049] Example 2

[0050] Based on Embodiment 1, the position of the first pulley 122 on the first fixed plate 121 is adjustable, and the position of the second pulley 132 on the second fixed plate 131 is adjustable. By adjusting the positions of the first pulley 122 on the first fixed plate 121 and the second pulley 132 on the second fixed plate 131 respectively, or by adjusting the positions of the first pulley 122 and the second pulley 132 on the first fixed plate 121 and the second fixed plate 131 simultaneously, the tension direction of the cable can be changed to adapt to different model designs.

[0051] Example 3

[0052] In this embodiment, the mooring device 100 adopts a four-point mooring arrangement scheme, with four sets of platform connection mechanisms 110, fixing mechanisms 120 and tensioning mechanisms 130 arranged at the four vertices of the platform model 300. The connection method of the platform connection mechanism 110, fixing mechanism 120 and tensioning mechanism 130 is the same as that in embodiment 1.

[0053] When disassembling this mooring device, because the mooring device adopts a modular structure, all connection points can use quick-disassembly connectors such as universal hooks, flanges, bolts or couplings. The device can be quickly disassembled and transported by simply disassembling the device according to the modules. The whole process takes no more than 30 minutes on average. Compared with the traditional device that requires overall hoisting and on-site welding, it has significant improvements in efficiency and reusability.

[0054] The present invention provides a test method for the mooring device based on the above-mentioned tension leg platform pool test, comprising the following steps:

[0055] Based on the design scheme of the tension leg platform, a scaled-down model of a certain proportion is established, and a suitable test water tank 200 and platform model 300 are selected.

[0056] The connection positions of the first fixing plate 121 and the second fixing plate 131 in the test water tank 200 are determined according to the design scheme.

[0057] According to the design scheme, the first mooring cable 114, the tension spring 115, and the second mooring cable 116 are selected.

[0058] The mooring point of platform model 300 is connected to the first swivel shackle 111;

[0059] The control unit is activated, and it monitors the tension sensor 112 and controls the servo motor 134 in real time to conduct a water tank test.

[0060] When comparing multiple schemes, the above method can also include the following adjustment steps based on changes in the design scheme, such as different directions of tension force, different magnitudes of tension force, different dynamic response characteristics of the tensioning system, and different overall stiffness distribution: adjusting the position of the first pulley 122 on the first fixed plate 121; and / or, adjusting the position of the second pulley 132 on the second fixed plate 131; and / or, adjusting the position of the first fixed plate 121; and / or, adjusting the position of the second fixed plate 131; and / or, connecting the tension spring 115 to the first connecting piece at different lengths of the first mooring rope 114; and / or, connecting the tension spring to the second connecting piece at different lengths of the second mooring rope 116; and / or, replacing the first mooring rope 114 with a different specification; and / or, replacing the tension spring 115 with a different specification; and / or, replacing the second mooring rope 116 with a different specification. These steps can be selected and combined according to the experimental scheme.

[0061] The mooring device and method for tension leg platform water tank testing provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the invention, and the descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the invention. It should be noted that those skilled in the art can make several improvements and modifications to the invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A mooring device (100) for a tension leg platform pool test, comprising a first mooring cable (114), a tension spring (115), and a second mooring cable (116) connected in sequence, wherein the second mooring cable (116) is connected to a tensioning mechanism (130); The specifications of the first mooring cable (114) and the second mooring cable (116) meet the requirements. and, A is the cross-sectional area of ​​the cable, k is the safety factor, and T is the cross-sectional area of ​​the cable. max For the maximum expected tensile force, σ allow Let d be the allowable stress of the cable material, d be the cable diameter, L be the effective stress-bearing length of the cable, R be the judgment threshold, and K be the allowable stress of the cable material. s E represents the stiffness of the tension spring, and E represents the elastic modulus of the cable material.

2. The mooring device for a tension leg platform water tank test according to claim 1, characterized in that, The stiffness K of the tension spring (115) s satisfy △T represents the change in target tension force, and △x represents the allowable elongation.

3. The mooring device for a tension leg platform water tank test according to claim 1, characterized in that, It also includes a first pulley (122) on the first fixed plate (121) and a second pulley (132) on the second fixed plate (131). The second mooring cable (116) is wound around the first pulley (122) and the second pulley (132) and then connected to the tensioning mechanism (130). The first fixed plate (121) and the second fixed plate (131) are detachably connected to the test water tank (200).

4. The mooring device for a tension leg platform water tank test according to claim 3, characterized in that, The position of the first pulley (122) on the first fixed plate (121) is adjustable, and / or the position of the second pulley (132) on the second fixed plate (131) is adjustable.

5. The mooring device for a tension leg platform water tank test according to claim 1, characterized in that, The first mooring rope (114) is provided with a first connector at different lengths, and the first connector is connected to the tension spring (115); and / or, the second mooring rope (116) is provided with a second connector at different lengths, and the second connector is connected to the tension spring (115).

6. The mooring device for a tension leg platform water tank test according to claim 1, characterized in that, It also includes a platform connection mechanism (110), which includes a first rotary shackle (111), a tension sensor (112), and a second rotary shackle (113) connected in sequence, and the second rotary shackle (113) is connected to the first mooring cable (114).

7. The mooring device for a tension leg platform water tank test according to any one of claims 1-6, characterized in that, The tensioning mechanism (130) includes a cable drum (133) and a servo motor (134). The second mooring cable (116) is connected to the cable drum (133), and the output end of the servo motor (134) drives the cable drum (133) to rotate.

8. The mooring device for a tension leg platform water tank test according to claim 7, characterized in that, It also includes a control unit for real-time monitoring of the tension sensor (112) and control of the servo motor (134).

9. A test method for a mooring device used in a tension leg platform water tank test, characterized in that, The mooring device for a tension leg platform water tank test according to claim 8 is tested, comprising the following steps: Based on the design scheme of the tension leg platform, a scaled-down model of a certain proportion was established, and a suitable test water tank (200) and platform model (300) were selected. The connection positions of the first fixing plate (121) and the second fixing plate (131) in the test water tank (200) are determined according to the design scheme; The first mooring cable (114), tension spring (115), and second mooring cable (116) are selected according to the design scheme. The mooring point of the platform model (300) is connected to the first swivel shackle (111); Start the control unit to conduct a water tank test.

10. The test method for the mooring device used in the tension leg platform water tank test according to claim 9, characterized in that, The method also includes the steps of: replacing the first mooring rope (114) with a different specification; and / or, replacing the second mooring rope (116) with a different specification; and / or, replacing the tension spring (115) with a different specification; and / or, adjusting the position of the first fixing plate (121); and / or, adjusting the position of the second fixing plate (131); and / or, adjusting the position of the first pulley (122) on the first fixing plate (121); and / or, adjusting the position of the second pulley (132) on the second fixing plate (131); and / or, connecting the tension spring (115) to the first connector at different lengths of the first mooring rope (114); and / or, connecting the tension spring (115) to the second connector at different lengths of the second mooring rope (116).

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