A device for measuring dynamic impedance of a barrel-shaped foundation of an offshore wind turbine

Abstract

This invention discloses a test device for measuring the dynamic impedance of a barrel foundation for offshore wind turbines, belonging to the technical field of test device technology. The device includes a test barrel filled with test sand, and a detachable cover assembly on the top of the barrel; a barrel foundation model embedded in the test sand within the barrel; and a loading test assembly positioned above the cover assembly for applying dynamic loads to the barrel foundation model and collecting response data. The loading test assembly includes at least one set of tilting servo electric cylinders and at least one set of vertical servo electric cylinders, with tilt force sensors and vertical force sensors respectively installed at their output ends. The universal joint of this invention can compensate for the minute displacements generated by the barrel foundation model under dynamic loads, allowing the load to be evenly distributed across the barrel foundation surface, eliminating local stress concentrations, and ensuring precise and stable power transmission.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and specifically to a testing device for measuring the dynamic impedance of a barrel foundation for offshore wind turbines. Background Technology

[0002] Multi-bucket foundations for offshore wind turbines are a new type of foundation with great application potential. They work together to resist the oblique loads transmitted by the wind turbine tower by having each bucket bear the vertical reaction force. As wind turbines become larger and taller, the structural flexibility of wind turbines is enhanced, and the dynamic impedance of the bucket foundations under low-frequency loads has an increasingly significant impact on the vibration characteristics of wind turbines.

[0003] Patent CN108343096A discloses a composite test device and method for measuring the dynamic impedance of offshore wind turbine barrel foundations. This patent can more realistically simulate the vertical and oblique loads, as well as the huge overturning moment, experienced by offshore wind turbines in their marine environment, while simultaneously measuring the dynamic impedance under vertical coupling and dynamic bending moment. In particular, the measurement of the swaying dynamic impedance under the action of dynamic bending moment is of great significance for controlling the rotation angle of the barrel foundation under the action of overturning moment.

[0004] Although this patent can simulate the environment more realistically, the test device in this patent has a rigid direct connection between the loading point and the contact surface of the barrel base when cyclic load is applied. The load transfer is concentrated and unevenly distributed, which can easily cause local stress concentration in the barrel base and distortion of the model deformation. At the same time, the material dropping and spreading method has no guiding and dispersing structure. When the test sand is filled in the model box, it falls in a concentrated point, resulting in local accumulation and uneven density. This directly leads to inconsistent seabed soil parameters and large errors in dynamic impedance testing. Summary of the Invention

[0005] The main objective of this invention is to provide a test device for measuring the dynamic impedance of offshore wind turbine barrel foundations, thereby overcoming the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A test device for measuring the dynamic impedance of a barrel foundation for an offshore wind turbine includes a test barrel filled with test sand, and a detachable cover assembly on the top of the test barrel. A barrel-shaped foundation model is embedded in the test sand inside the test barrel; And a loading test component, set above the cover plate component, is used to apply dynamic loads to the barrel foundation model and collect response data; The loading test assembly includes at least one set of tilt servo electric cylinders and at least one set of vertical servo electric cylinders. The output ends of the tilt servo electric cylinders and the vertical servo electric cylinders are respectively equipped with tilt force sensors and vertical force sensors. The tilt force sensors and the vertical force sensors are rotatably connected to the top of the barrel-shaped base model through universal joints.

[0007] Through the above technical solutions, the universal ball joint can compensate for the small displacements generated by the barrel foundation model under dynamic loads, so that the load is evenly distributed to the surface of the barrel foundation, eliminating local stress concentration and ensuring accurate and stable power transmission.

[0008] Furthermore, an accelerometer is installed on the outer wall of the barrel-shaped foundation model, a soil pressure gauge is installed at the bottom, strain gauges are embedded in the side walls, and a micro pore water pressure gauge is embedded in the test sand.

[0009] Furthermore, the cover assembly includes a first connecting cover and a second connecting cover, a placement ring is provided on the outside of the test barrel, and a handle is provided on the top of the first connecting cover.

[0010] Furthermore, the tilting servo electric cylinder and the vertical servo electric cylinder in the loading test assembly are rotatably connected to the first connecting cover.

[0011] Furthermore, a feeding hopper is provided at the top center of the second connecting cover, and a straight discharge pipe is connected to the bottom of the feeding hopper. The lower ends of the straight discharge pipe are symmetrically connected to inclined discharge pipes.

[0012] The above technical solution uses a combination of a feeding hopper, a straight discharge pipe, and an inclined discharge pipe to control the direction and width of the test sand, ensuring that the test sand falls evenly into the test barrel and preventing local accumulation of the test sand.

[0013] Furthermore, a support plate is fixedly connected to one side of the bottom of the second connecting cover, and a motor is fixed on the support plate. The output end of the motor is connected to a rotating shaft.

[0014] Furthermore, the rotating shaft extends upwards through and into the interior of the feeding straight pipe, and a material-dispersing plate for breaking up materials is fixed on the rotating shaft.

[0015] Through the above technical solution, the motor drives the rotating shaft to disperse the test sand in the test barrel, so as to achieve uniform layering of the test sand, ensure that the test sand is densely laid, and ensure that the density of the test sand is consistent.

[0016] Furthermore, the bottom of the first connecting cover and the second connecting cover are fixedly connected with a fixing ring, and the fixing ring is inserted into the slot on the top of the placement ring.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The universal ball joint of the present invention can compensate for the small displacement of the barrel foundation model under dynamic load, so that the load is evenly distributed to the surface of the barrel foundation, eliminating local stress concentration and ensuring accurate and stable power transmission. The feeding hopper, straight discharge pipe, and inclined discharge pipe of this invention work together to control the discharge direction and width of the test sand, so that the test sand falls evenly into the test barrel and avoids local accumulation of test sand. At the same time, the motor drives the rotating shaft to rotate, which disperses the test sand in the test barrel and realizes the test sand is evenly distributed in layers, ensuring that the test sand is densely distributed and that the density of the test sand is consistent. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the present invention.

[0020] Figure 3 This is a plan view of the present invention.

[0021] Figure 4 This is a schematic diagram of the connection structure between the motor and the feed plate of the present invention.

[0022] Figure 5 This is a bottom view of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Test barrel body; 2. First connecting cover; 3. Placement ring; 4. Handle; 5. Test sand; 6. Fixing ring; 7. Tilting servo electric cylinder; 8. Vertical servo electric cylinder; 9. Tilting force sensor; 10. Vertical force sensor; 11. Universal ball joint; 12. Barrel-shaped foundation model; 13. Accelerometer; 14. Soil pressure gauge; 15. Strain gauge; 16. Miniature pore water pressure gauge; 17. Feed hopper; 18. Feeding straight pipe; 19. Feeding inclined pipe; 20. Feeding plate; 21. Support plate; 22. Motor; 23. Rotating shaft; 24. Second connecting cover. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Combination Figures 1 to 5 This embodiment provides a test device for measuring the dynamic impedance of a barrel foundation for an offshore wind turbine, including a test barrel 1, a barrel foundation model 12, and a loading test assembly. The test barrel 1 is filled with test sand 5, and a detachable cover plate assembly is provided on the top of the test barrel 1. The barrel foundation model 12 is buried in the test sand 5 inside the test barrel 1. The loading test assembly is set above the cover plate assembly and is used to apply dynamic loads to the barrel foundation model 12 and collect response data. The loading test component includes at least one set of tilt servo electric cylinders 7 and at least one set of vertical servo electric cylinders 8. The output ends of the tilt servo electric cylinders 7 and vertical servo electric cylinders 8 are respectively equipped with tilt force sensors 9 and vertical force sensors 10. The tilt force sensors 9 and vertical force sensors 10 are rotatably connected to the top of the barrel-shaped base model 12 through universal ball joints 11.

[0026] First, in preparation for the test, the staff used the handle 4 on the top of the first connecting cover 2 to install the detachable cover assembly on the test barrel 1, so that the cover assembly and the test barrel 1 are sealed and fixed.

[0027] After the test begins, the external control system sends control commands to the loading test component located above the cover plate assembly, controlling the loading test component to apply a preset dynamic load to the barrel-shaped foundation model 12. The loading test component includes at least one set of tilting servo electric cylinders 7 and at least one set of vertical servo electric cylinders 8. The tilting servo electric cylinders 7 and 8 are rotatably connected to the cover plate assembly and can adjust the loading angle, loading force, and loading frequency under the control of the external control system. The output end of the tilting servo electric cylinder 7 is equipped with a tilt force sensor 9, and the output end of the vertical servo electric cylinder 8 is equipped with a vertical force sensor 10. Both the tilt force sensor 9 and the vertical force sensor 10 are rotatably connected to the top of the barrel-shaped foundation model 12 through a universal ball joint 11, which can stably transmit the dynamic load and adapt to the small displacement of the barrel-shaped foundation model 12 under the load. At the same time, the tilt force sensor 9 and the vertical force sensor 10 transmit the load data in the tilt direction and vertical direction collected in real time to the external control system.

[0028] Reference Figures 1-3 An accelerometer 13 is installed on the outer wall of the barrel-shaped foundation model 12, an earth pressure gauge 14 is installed at the bottom, strain gauges 15 are embedded in the side walls, and a micro pore water pressure gauge 16 is embedded in the test sand 5.

[0029] An accelerometer 13 installed on the outer wall of the barrel foundation model 12, an earth pressure gauge 14 installed at the bottom, a strain gauge 15 embedded in the side wall, and a miniature pore water pressure gauge 16 in the test sand 5 are used to synchronously transmit the collected vibration acceleration data of the barrel foundation model 12, the earth pressure data between the bottom and the test sand 5, the side wall strain data, and the pore water pressure data inside the test sand 5 to the external control system. The external control system summarizes, analyzes, and processes all received load data, vibration response data, and soil stress and deformation data, and finally completes the measurement and evaluation of the dynamic impedance of the offshore wind turbine barrel foundation.

[0030] Reference Figures 3-4The cover assembly includes a first connecting cover 2 and a second connecting cover 24. A placement ring 3 is provided on the outside of the test barrel 1. A handle 4 is provided on the top of the first connecting cover 2. A fixing ring 6 is fixedly connected to the bottom of the first connecting cover 2 and the second connecting cover 24. The fixing ring 6 is inserted into the slot on the top of the placement ring 3.

[0031] First, test preparation is carried out. The cover assembly includes a first connecting cover 2 and a second connecting cover 24. Using the handle 4 on the top of the first connecting cover 2, the operator prepares to introduce the sand. Then, the second connecting cover 24 is installed on the test chamber 1. Since the test chamber 1 has a placement ring 3 on its outer side, and the bottoms of the first and second connecting covers 24 are fixedly connected by a fixing ring 6, the fixing ring 6 is inserted into the slot on the top of the placement ring 3 to achieve a sealed fixation between the cover assembly and the test chamber 1, ensuring that the test sand 5 will not leak and the test environment remains stable during the test. After introducing the sand, the cover is removed, the first connecting cover 2 is installed, and the test is conducted.

[0032] Reference Figures 4-5 The second connecting cover 24 has a feeding hopper 17 at the top center, and a feeding straight pipe 18 is connected to the bottom of the feeding hopper 17. The feeding straight pipe 18 has feeding inclined pipes 19 symmetrically connected to both sides of its lower end. A support plate 21 is fixedly connected to one side of the bottom of the second connecting cover 24. A motor 22 is fixed on the support plate 21. The output end of the motor 22 is connected to a rotating shaft 23.

[0033] The test sand 5 is filled into the test barrel 1 through the feeding hopper 17 located at the top center of the second connecting cover 24. The test sand 5 is fed into the test barrel 1 through the feeding straight pipe 18 connected to the bottom of the feeding hopper 17, and then evenly falls into the test barrel 1 through the feeding inclined pipes 19 symmetrically connected to both sides of the lower end of the feeding straight pipe 18. At the same time, the motor 22 fixed on the support plate 21 fixedly connected to the bottom side of the second connecting cover 24 is started. The rotating shaft 23 connected to the output end of the motor 22 rotates accordingly. During the rotation of the rotating shaft 23, the test sand 5 in the test barrel 1 is dispersed to ensure that the test sand 5 is evenly and densely spread. Then seawater is added to complete the installation and arrangement of the test.

[0034] Reference Figures 1-3 The tilting servo electric cylinder 7 and the vertical servo electric cylinder 8 in the loading test component are rotatably connected to the first connecting cover 2.

[0035] Working principle: In the test preparation stage, the staff first prepares the sand body introduction. The cover plate assembly includes a first connecting cover 2 and a second connecting cover 24. A placement ring 3 is provided on the outside of the test barrel 1. A handle 4 is provided on the top of the first connecting cover 2. A fixing ring 6 is fixedly connected to the bottom of the first connecting cover 2 and the second connecting cover 24. The staff uses the handle 4 to install the second connecting cover 24 in the cover plate assembly on the test barrel 1, and inserts the fixing ring 6 into the slot on the top of the placement ring 3 to achieve the sealing and fixation of the second connecting cover 24 and the test barrel 1. Test sand 5 is filled into the test barrel 1 through the feeding hopper 17 at the top center of the second connecting cover 24. The test sand 5 is fed into the test barrel 1 through the feeding straight pipe 18 connected to the bottom of the feeding hopper 17, and then evenly falls into the test barrel 1 through the feeding inclined pipes 19 symmetrically connected to both sides of the lower end of the feeding straight pipe 18. At the same time, the motor 22 fixed on the support plate 21 on one side of the bottom of the second connecting cover 24 is started. The material feeding plate 20 on the rotating shaft 23 connected to the output end of the motor 22 rotates accordingly to disperse the test sand 5, ensuring that the test sand 5 is spread evenly and densely. Then seawater is added.

[0036] After the sand body is introduced, the second connecting cover 24 is removed, the first connecting cover 2 is installed, and the sealing and fixation are achieved again through the insertion and engagement of the fixing ring 6 and the placement ring 3. After the test begins, the external control system sends control commands to the loading test assembly set above the first connecting cover 2. The tilting servo electric cylinder 7 and the vertical servo electric cylinder 8 in the loading test assembly are rotatably connected to the first connecting cover 2, and can adjust the loading angle, force, and frequency under the control of the external control system. The tilting force sensor 9 and the vertical force sensor 10, respectively, are located at the output ends of the two components and are rotatably connected to the top of the barrel foundation model 12 through the universal ball joint 11. They transmit dynamic loads and collect load data in the tilting and vertical directions, and transmit them to the external control system. The acceleration sensor 13 on the outer wall of the barrel foundation model 12, the soil pressure gauge 14 at the bottom, the strain gauge 15 embedded in the side wall, and the miniature pore water pressure gauge 16 in the test sand 5 collect vibration acceleration, soil pressure, side wall strain, and pore water pressure data, respectively, and transmit them synchronously. The external control system summarizes, analyzes, and processes all the data, and finally completes the measurement and evaluation of the dynamic impedance of the barrel foundation.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A test device for measuring the dynamic impedance of a barrel foundation for an offshore wind turbine, characterized in that, include: Test barrel (1), the test barrel (1) is filled with test sand (5), and the top of the test barrel (1) is provided with a detachable cover plate assembly; A barrel-shaped foundation model (12) is embedded in the test sand (5) inside the test barrel (1); And a loading test component, set above the cover plate component, is used to apply dynamic loads to the barrel-shaped foundation model (12) and collect response data; The loading test assembly includes at least one set of tilt servo electric cylinders (7) and at least one set of vertical servo electric cylinders (8). The output ends of the tilt servo electric cylinders (7) and vertical servo electric cylinders (8) are respectively provided with tilt force sensors (9) and vertical force sensors (10). The tilt force sensors (9) and vertical force sensors (10) are rotatably connected to the top of the barrel-shaped base model (12) through universal ball joints (11).

2. The test device for measuring the dynamic impedance of a barrel foundation of an offshore wind turbine as described in claim 1, characterized in that, An acceleration sensor (13) is provided on the outer wall of the barrel-shaped foundation model (12), a soil pressure gauge (14) is provided at the bottom, a strain gauge (15) is embedded in the side wall, and a micro pore water pressure gauge (16) is embedded in the test sand (5).

3. The test device for measuring the dynamic impedance of a barrel foundation for an offshore wind turbine as described in claim 1, characterized in that, The cover assembly includes a first connecting cover (2) and a second connecting cover (24). The outer side of the test barrel (1) is provided with a placement ring (3), and the top of the first connecting cover (2) is provided with a handle (4).

4. The test device for measuring the dynamic impedance of a barrel foundation for an offshore wind turbine as described in claim 3, characterized in that: The tilting servo electric cylinder (7) and the vertical servo electric cylinder (8) in the loading test assembly are rotatably connected to the first connecting cover (2).

5. The test device for measuring the dynamic impedance of a barrel foundation for an offshore wind turbine as described in claim 3, characterized in that, The second connecting cover (24) has a feeding hopper (17) at the top center position. The bottom of the feeding hopper (17) is connected to a discharge straight pipe (18). The lower ends of the discharge straight pipe (18) are symmetrically connected to discharge inclined pipes (19).

6. The test device for measuring the dynamic impedance of a barrel foundation of an offshore wind turbine as described in claim 5, characterized in that, A support plate (21) is fixedly connected to one side of the bottom of the second connecting cover (24), and a motor (22) is fixed on the support plate (21). The output end of the motor (22) is connected to a rotating shaft (23).

7. The test device for measuring the dynamic impedance of a barrel foundation for an offshore wind turbine as described in claim 6, characterized in that, The rotating shaft (23) extends upward through and into the interior of the feeding straight pipe (18), and a material-dispersing plate (20) for dispersing materials is fixed on the rotating shaft (23).

8. The test device for measuring the dynamic impedance of a barrel foundation of an offshore wind turbine as described in claim 7, characterized in that, The bottom of the first connecting cover (2) and the second connecting cover (24) are fixedly connected with a fixing ring (6), and the fixing ring (6) is inserted into the slot at the top of the placement ring (3).

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