Integrated experimental device for fatigue test and displacement monitoring of offshore wind power suction caisson jacket foundation

Abstract

This utility model belongs to the field of offshore wind power and discloses an integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundations. It includes a support frame and a sandbox. The support frame is equipped with a cyclic loading mechanism, a displacement measuring mechanism, and a unidirectional loading mechanism. The sandbox is used to place the suction cylinder jacket foundation. The cyclic loading mechanism is connected to the tower and includes an actuator, a floating joint, and a tension sensor connected in sequence. The displacement measuring mechanism detects the displacement of the tower. The unidirectional loading mechanism includes a loading rope and a loading counterweight. One end of the loading rope is connected to the tower, and the other end is connected to the loading counterweight. This utility model integrates cyclic loading, unidirectional loading, and displacement monitoring on the same platform, realizing synchronous loading and real-time measurement of the fatigue response and foundation tilting process of the suction cylinder jacket, improving experimental efficiency and data consistency.

Description

Technical Field

[0001] This utility model relates to the field of offshore wind power, specifically an integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation. Background Technology

[0002] With the large-scale deployment of offshore wind power, suction tube jacket foundations, as a crucial structural element supporting large wind turbines, are subjected to long-term stresses from complex marine environmental loads during their service life, leading to increasingly prominent fatigue failure and foundation tilting instability issues. Currently, research on the fatigue performance and stability of suction tube jacket foundations mainly relies on numerical simulation and locally scaled physical model tests. Fatigue tests typically employ a uniaxial loader to apply periodic loads, while foundation stability testing involves static lateral loading combined with displacement sensor observation. However, existing testing methods are mostly conducted in stages, lacking simultaneous testing of fatigue damage evolution and foundation displacement changes, making it difficult to comprehensively reflect the coupled failure mechanisms of suction tube jackets under actual operating conditions.

[0003] Furthermore, traditional experimental setups are mostly based on rigid bases or simplified support models, lacking realistic simulations of actual seabed environmental conditions (such as sand density and water saturation), leading to discrepancies between experimental results and engineering realities. Meanwhile, existing loading systems often employ hydraulic cylinders or servo-driven structures, resulting in large sizes, complex operations, and fixed connections to the model, lacking the ability to flexibly adapt to different specifications of suction cylinder jacket foundations. These shortcomings limit the effectiveness of physical experiments in studying the service behavior of offshore wind power foundations and make it difficult to meet the need for continuous observation of long-term fatigue evolution and instability processes.

[0004] To address the above issues, this application provides an integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction tube jacket foundations. This device simulates actual seabed conditions in a controllable sandbox environment, and uses an electric ball screw mechanism to achieve fatigue loading on the top of the suction tube jacket. Simultaneously, it is equipped with lateral standard weight loading and a displacement sensor array, enabling real-time monitoring of the tilt evolution of the suction tube jacket foundation during fatigue loading. The modular design of the overall structure offers advantages such as high loading accuracy, good environmental similarity, and strong adaptability, effectively overcoming the shortcomings of existing technologies and improving the reliability of physical experiments for studying the service performance of suction tube jacket foundations. Utility Model Content

[0005] The purpose of this invention is to provide an integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation includes a support frame and a sandbox. The support frame is equipped with a cyclic loading mechanism, a displacement measuring mechanism, and a unidirectional loading mechanism. The sandbox is used to place the suction cylinder jacket foundation. The cyclic loading mechanism is connected to the tower and includes an actuator, a floating joint, and a tension sensor connected in sequence. The displacement measuring mechanism detects the displacement of the tower. The unidirectional loading mechanism includes a loading rope and a loading counterweight. One end of the loading rope is connected to the tower, and the other end is connected to the loading counterweight.

[0008] Furthermore, it also includes a sandbox bottom moving device, on which the sandbox is mounted, and the sandbox bottom moving device drives the sandbox to move horizontally.

[0009] Furthermore, the sandbox bottom moving device includes a lower guide rail, an upper guide rail, an X-axis driver, and a Y-axis driver. The upper guide rail is slidably fitted onto the lower guide rail along the Y-axis direction, and the sandbox is slidably fitted onto the upper guide rail along the X-axis direction. The X-axis driver drives the sandbox to move along the X-axis on the upper guide rail, and the Y-axis driver drives the upper guide rail to move along the Y-axis on the lower guide rail.

[0010] Furthermore, the cyclic loading mechanism also includes a cyclic loading bracket, and the actuator is disposed on the cyclic loading bracket.

[0011] Furthermore, the tension sensor is connected to a clamp fitted onto the tower.

[0012] Furthermore, the displacement measuring mechanism includes a displacement mounting bracket mounted on a support frame, a displacement clamp mounted on the displacement mounting bracket, and a displacement sensor mounted on the displacement clamp, wherein the displacement sensor faces the side wall of the tower.

[0013] Furthermore, the displacement sensor is connected to a clamp fitted onto the tower.

[0014] Furthermore, the unidirectional loading mechanism also includes a loading pulley, and the loading rope is wound around the loading pulley.

[0015] Furthermore, the loading rope is connected to the clamps on the tower.

[0016] Furthermore, one or more of the cyclic loading mechanism, displacement measuring mechanism, and unidirectional loading mechanism can adjust their installation height on the support frame.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1) Integrated loading and monitoring design: Cyclic loading, unidirectional loading and displacement monitoring are integrated on the same platform to realize synchronous loading and real-time measurement of fatigue response and foundation tilting process of suction cylinder jacket, thereby improving test efficiency and data consistency.

[0019] 2) Two-way adjustable sandbox positioning platform: The bottom of the sandbox is equipped with X / Y dual-axis guide rails and corresponding drivers to support precise horizontal adjustment and rapid positioning, ensuring the centering accuracy of the suction cylinder guide frame and optimizing the coaxiality of the loading path and the ability to repeat the test.

[0020] 3) Modular structure and sensing expansion capability: Each functional module is arranged independently, supporting rapid disassembly and assembly and signal expansion, which can be adapted to different experimental needs and has good scalability and cross-model applicability. Attached Figure Description

[0021] Figure 1 This is one of the structural schematic diagrams of this utility model.

[0022] Figure 2 This is the second schematic diagram of the structure of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the sand box bottom moving device in this utility model.

[0024] In the diagram: 1. Suction cylinder guide frame foundation; 2. Tower; 3. Support frame; 4. Sandbox; 5. Cyclic loading mechanism; 5. Actuator; 500; 501. Floating joint; 502. Tension sensor; 503. Cyclic loading bracket; 6. Displacement measuring mechanism; 6. Displacement mounting bracket; 600. Displacement clamp; 601. Displacement sensor; 602. Unidirectional loading mechanism; 7. Loading rope; 700. Loading counterweight; 701. Loading pulley; 702. Sandbox bottom moving device; 8. Lower guide rail; 800. Upper guide rail; 801. X-axis driver; 802. Y-axis driver; 803. Clamp; 9. Top counterweight; 10. Tilt sensor; 11. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-3An integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation includes a support frame 3 and a sandbox 4. The support frame 3 is equipped with a cyclic loading mechanism 5, a displacement measuring mechanism 6, and a unidirectional loading mechanism 7. The sandbox 4 is used to place the suction cylinder jacket foundation 1. The cyclic loading mechanism 5 is connected to the tower 2 and includes an actuator 500, a floating joint 501, and a tension sensor 502 connected in sequence. The displacement measuring mechanism 6 detects the displacement of the tower 2. The unidirectional loading mechanism 7 includes a loading rope 700 and a loading counterweight 701. One end of the loading rope 700 is connected to the tower 2, and the other end is connected to the loading counterweight 701.

[0027] Continue reading Figure 1 and Figure 2 In one embodiment of the present invention, the cyclic loading mechanism 5 further includes a cyclic loading bracket 503, and the actuator 500 is disposed on the cyclic loading bracket 503.

[0028] Continue reading Figure 1 and Figure 2 In one embodiment of this utility model, the tension sensor 502 is connected to the clamp 9 sleeved on the tower 2.

[0029] The cyclic loading mechanism is used to simulate the cyclic fatigue loads experienced by offshore wind turbine suction tube jackets under actual working conditions. Its core function is to apply a controllable periodic reciprocating load to the top of the suction tube jacket, simulating the long-term fatigue response of the structure under wind and wave action. The cyclic loading bracket 503 provides a rigid mounting platform for the cyclic loading mechanism, fixing the actuator body and ensuring that its axial direction is accurately aligned with the top of the suction tube jacket model. The actuator 500, as the loading execution component, is generally an electric linear actuator or servo cylinder, which realizes periodic tension and compression loading on the top of the suction tube jacket through reciprocating linear motion. The floating joint 501 is a known technology and is set between the actuator 500 and the suction tube jacket connection end to eliminate the influence of assembly errors or slight offsets on loading accuracy and improve loading stability and coaxiality. The tension sensor 502 is installed after the floating joint 501 to collect the axial force data applied to the suction tube jacket model in real time during the loading process, realizing closed-loop control or load accuracy monitoring.

[0030] The cyclic loading mechanism adopts a ball screw direct drive loading structure, combined with a floating joint and force sensor, which has high frequency response, strong structural compatibility, and is compatible with various specifications of suction cylinder guide frame models, making it easy to maintain and integrate.

[0031] Continue reading Figure 1 and Figure 2In one embodiment of the present invention, the displacement measuring mechanism 6 includes a displacement mounting bracket 600 disposed on the support frame 3, a displacement clamp 601 disposed on the displacement mounting bracket 600, and a displacement sensor 602 disposed on the displacement clamp 601. The displacement sensor 602 faces the side wall of the tower 2 and is connected to the clamp 9 sleeved on the tower 2.

[0032] Among them, the displacement clamp 601 is a clamp structure and is locked with bolts.

[0033] The displacement measurement mechanism 6 is used to monitor the axial or lateral displacement changes of the top of the suction cylinder jacket in real time during the loading process, quantifying the evolution of the structural response under load. Through a rigid connection with a reference point at the top of the suction cylinder jacket, and in conjunction with a high-precision displacement sensor, this mechanism enables continuous, non-contact displacement measurement, providing crucial data support for the foundation stability and fatigue damage analysis of the suction cylinder jacket.

[0034] The displacement mounting bracket 600 is used to support the entire measuring mechanism and provide a stable mounting reference that is relatively static with respect to the platform structure; the displacement clamp 601 rigidly connects the sensor end to the connection point on the suction cylinder guide frame to ensure that the measurement path is fixed and the force transmission is direct; the displacement sensor 602 is the core measuring element, which can realize real-time displacement detection at the micron level.

[0035] Continue reading Figure 1 and Figure 2 In one embodiment of the present invention, the unidirectional loading mechanism 7 further includes a loading pulley 702 and a pulley mounting bracket. The pulley mounting bracket is mounted on the support frame, and the loading rope 700 is wound around the loading pulley 702. The loading rope 700 is connected to the clamp 9 on the tower 2.

[0036] The unidirectional loading mechanism 7 is used to simulate the stability evolution of a suction cylinder jacket foundation under long-term lateral constant load in a marine environment. This mechanism, through a loading bracket suspending a counterweight system, applies a constant force of constant direction and magnitude to the side of the suction cylinder jacket structure, thereby inducing a continuous tilting tendency. Combined with a displacement measurement mechanism, the overall stability performance of the suction cylinder jacket under asymmetric external forces can be studied. Specifically, the unidirectional loading bracket serves as the structural foundation for the entire lateral loading system, fixed above the support frame 3, supporting the pulleys and counterweight system. The loading rope 700 is connected to the tower 2 via a pulley 702, with one end fixed to the clamp of the tower 2 and the other end suspending the loading counterweight 701. The loading counterweight 701 is an adjustable standard weight assembly used to set different lateral load conditions, featuring convenient replacement and controllable force values.

[0037] Continue reading Figure 1 and Figure 2In one embodiment of this utility model, the cyclic loading mechanism 5, the displacement measuring mechanism 6, and the unidirectional loading mechanism 7 can all adjust their installation height on the support frame 3.

[0038] Specifically, the support frame 3 has an inverted U-shaped structure, and the inner sides of its two columns are covered with mounting holes from top to bottom. The displacement mounting bracket 600, pulley mounting bracket, and cyclic loading bracket 503 achieve position adjustment by cooperating with mounting holes of different heights.

[0039] Continue reading Figures 1-3 In one embodiment of the present invention, a sandbox bottom moving device 8 is also included. The sandbox 4 is disposed on the sandbox bottom moving device 8, and the sandbox bottom moving device 8 drives the sandbox 4 to move horizontally.

[0040] Specifically, the sandbox bottom moving device 8 includes a lower guide rail 800, an upper guide rail 801, an X-axis driver 802, and a Y-axis driver 803. The upper guide rail 801 is slidably fitted onto the lower guide rail 800 along the Y-axis via rollers. The sandbox 4 is slidably fitted onto the upper guide rail 801 along the X-axis via rollers. The two columns of the support frame are respectively set on the left and right sides of the lower guide rail 800. One end of the X-axis driver 802 is connected to the upper guide rail 801, and the other end is connected to the sandbox 4. The X-axis driver 802 drives the sandbox 4 to move along the X-axis on the upper guide rail 801. One end of the Y-axis driver 803 is connected to the lower guide rail 800, and the other end is connected to the upper guide rail 801. The Y-axis driver 803 drives the upper guide rail 801 to move along the Y-axis on the lower guide rail 800.

[0041] Among them, the X-axis driver 802 and the Y-axis driver 803 are preferably electric push cylinders, but pneumatic push rods and hydraulic push rods can also be used.

[0042] The bottom moving device 8 of the sandbox is used to achieve precise horizontal movement and position adjustment of the seabed simulation sandbox 4 on the experimental platform, so as to accurately center the suction cylinder guide frame model before the test and ensure the consistency of the loading path and the measurement benchmark. The device, by setting up upper and lower guide rails and drive mechanisms, constitutes a moving unit with guiding, bearing and driving functions, ensuring the stable sliding and positioning of the sandbox 4 in the two horizontal degrees of freedom.

[0043] The lower guide rail 800 serves as the basic guiding structure of the device, fixed at the bottom of the experimental platform, providing the overall X-axis sliding path for the sandbox. The upper guide rail 801 is mounted on the lower guide rail 800, bearing the Y-axis moving load of the sandbox 4 and facilitating the sliding interface, guiding the sandbox 4 to move horizontally. Two sets of sandbox moving rollers are mounted on the two guide rails respectively, serving as the main sliding load-bearing components to ensure low friction and smooth operation during movement. The X-axis driver 802 and Y-axis driver 803 provide driving force, pushing the sandbox to achieve controllable displacement through linear telescopic motion.

[0044] In use, a top counterweight 10 and an tilt sensor 11 are also installed on the top of the tower 2. The top counterweight 10 is a standard weight. This invention applies a stable lateral load by using the weight, and in conjunction with the displacement and tilt sensors, dynamically reflects the attitude changes of the suction cylinder guide frame, enhancing the real-time perception and judgment capability of the structural stability change process.

[0045] The aforementioned support frame 3 serves as the basic load-bearing structure of this invention, primarily supporting the sandbox 4, loading mechanism, suction cylinder jacket model, and measuring mechanism, ensuring good symmetry and stability in the spatial arrangement of each module. The support frame 3 employs a steel frame design, possessing excellent rigidity and load-bearing capacity, effectively resisting the reaction forces caused by fatigue loading and lateral constant loads during loading, maintaining the overall structural stability and loading path consistency of the experimental device. Simultaneously, the lower part of the support frame 3 connects to the bottom moving device 8 of the sandbox, achieving stable support and horizontal adjustment of the sandbox 4, providing structural assurance for the centering, positioning, and repeatable operation of this invention before testing. The sandbox 4, as the basic environmental module of this invention, is filled with sand material to simulate actual seabed geological conditions, providing a solid support medium for the suction cylinder jacket foundation 1. By controlling the filling density, particle size distribution, and water content of the sand layer, the sandbox 4 can reproduce the interaction between the suction cylinder jacket foundation 1 and the seabed under different geological conditions, ensuring that the foundation response of the suction cylinder jacket model in physical experiments has good similarity to the actual marine environment.

[0046] The suction cylinder jacket is the core component under test in this invention, simulating the foundation structure of a suction cylinder jacket embedded in the seabed rock or sand layer in an actual offshore wind farm. Its lower end is inserted into the simulated seabed inside the sandbox 4 to withstand the external forces applied by the fatigue loading device and lateral loading mechanism, and to transmit them to the sand layer, enabling a comprehensive evaluation of the foundation structure's stability, fatigue response, and displacement characteristics. The upper part of the suction cylinder jacket structure is equipped with various connection and measurement device interfaces (clamps), facilitating the integration of loading path coupling and condition monitoring functions.

[0047] The clamps corresponding to the displacement sensors are used to fix the reference points of the displacement measurement mechanism and are rigidly connected to the suction cylinder guide frame structure to ensure the accuracy of the displacement sensor measurement data. The clamps corresponding to the cyclic loading mechanism and the unidirectional loading mechanism are set in the middle of the tower to connect the two loading mechanisms and ensure that the loading force is accurately transmitted to the suction cylinder guide frame body. The top counterweight 10 of the tower 2 can adjust the total weight and center of gravity of the system to improve the stability of the model structure in the sandbox 4 environment. The tilt sensor 11 is installed on the top of the tower 2 to monitor the tilt angle changes of the suction cylinder guide frame during loading in real time and provide a basis for stability assessment.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation, characterized in that, The system includes a support frame (3) and a sandbox (4). The support frame (3) is equipped with a cyclic loading mechanism (5), a displacement measuring mechanism (6) and a unidirectional loading mechanism (7). The sandbox (4) is used to place the suction cylinder guide frame foundation (1). The cyclic loading mechanism (5) is connected to the tower (2) and includes an actuator (500), a floating joint (501) and a tension sensor (502) connected in sequence. The displacement measuring mechanism (6) detects the displacement of the tower (2). The unidirectional loading mechanism (7) includes a loading rope (700) and a loading counterweight (701). One end of the loading rope (700) is connected to the tower (2) and the other end is connected to the loading counterweight (701).

2. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 1, characterized in that, It also includes a sandbox bottom moving device (8), on which the sandbox (4) is mounted, and the sandbox bottom moving device (8) drives the sandbox (4) to move horizontally.

3. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 2, characterized in that, The sandbox bottom moving device (8) includes a lower guide rail (800), an upper guide rail (801), an X-axis driver (802), and a Y-axis driver (803). The upper guide rail (801) is slidably fitted on the lower guide rail (800) along the Y-axis direction. The sandbox (4) is slidably fitted on the upper guide rail (801) along the X-axis direction. The X-axis driver (802) drives the sandbox (4) to move along the X-axis on the upper guide rail (801). The Y-axis driver (803) drives the upper guide rail (801) to move along the Y-axis on the lower guide rail (800).

4. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 1, characterized in that, The cyclic loading mechanism (5) further includes a cyclic loading bracket (503), and the actuator (500) is disposed on the cyclic loading bracket (503).

5. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 1, characterized in that, The tension sensor (502) is connected to the clamp (9) fitted on the tower (2).

6. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 1, characterized in that, The displacement measuring mechanism (6) includes a displacement mounting bracket (600) mounted on the support frame (3), a displacement clamp (601) mounted on the displacement mounting bracket (600), and a displacement sensor (602) mounted on the displacement clamp (601). The displacement sensor (602) is facing the side wall of the tower (2).

7. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 6, characterized in that, The displacement sensor (602) is connected to the clamp (9) fitted on the tower (2).

8. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 1, characterized in that, The unidirectional loading mechanism (7) also includes a loading pulley (702), and the loading rope (700) is wound around the loading pulley (702).

9. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 8, characterized in that, The loading rope (700) is connected to the clamp (9) on the tower (2).

10. The integrated experimental device for fatigue testing and displacement monitoring of offshore wind turbine suction cylinder jacket foundation as described in claim 1, characterized in that, One or more of the cyclic loading mechanism (5), displacement measuring mechanism (6) and unidirectional loading mechanism (7) can adjust their installation height on the support frame (3).

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