Built-in tuned damper for offshore wind power single pile foundation and working method

Abstract

The invention discloses an offshore wind power single pile foundation built-in tuned damper and a working method, the offshore wind power single pile foundation built-in tuned damper comprises two parts of mass blocks, one part is located in seawater in a pile, and restoring torque is provided through interaction of the mass blocks and a water body; the other part of the mass blocks are located in the air below the suspension beam and above the water body, the part of the mass blocks are a water tank, the mass of the water tank is adjusted and increased according to the amount of water injected into the water tank, and then the center position between the two mass blocks is adjusted, so that the purpose of real-time tuning is achieved; the device has the advantages that the structure is simple, large damping force can be provided through interaction of the turbulent flow mass block and seawater in the pile, and no extra device is needed; meanwhile, the frequency of the damper can be changed in real time so as to achieve the optimal damping effect, and the damper has the advantages of being high in reliability and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind resistance damper structures, and particularly relates to an in - built tuned damper for a monopile foundation of an offshore wind turbine and a working method thereof. Background Art

[0002] With the rapid development of offshore wind power, the offshore wind power support structure, as an important part of wind power generation, is related to the safety and stability of wind turbine units. The monopile foundation, as the most commonly used foundation form for offshore wind power, has a wide range of applications.

[0003] As the capacity of offshore wind turbine units is getting larger and larger, the loads on the offshore wind power support structure are increasing. At the same time, due to the increasing water depth of offshore wind power, the support structure of offshore wind turbine units is becoming more flexible, and its support structure frequency is relatively close to the wave frequency, which will lead to a significant increase in both the extreme load and fatigue load of the waves. By increasing the damping of the support structure, the wind turbine loads, wave and other environmental loads on the offshore wind power support structure can be effectively reduced. Conventional dampers are installed inside the offshore wind power tower barrel, and they have problems such as small damping force provided by additional equipment such as viscous cylinders, poor shock absorption effect and poor adaptability.

[0004] However, when the frequency of the offshore wind turbine unit changes, the frequency of the existing damper cannot be quickly adjusted to adapt to the change of the whole unit's frequency. Summary of the Invention

[0005] The purpose of the present invention is to provide an in - built tuned damper for a monopile foundation of an offshore wind turbine and a working method thereof to overcome the technical problems of the existing damper with complex structure and slow frequency modulation.

[0006] To solve the above problems, the present invention adopts the following technical solutions: An in - built tuned damper for a monopile foundation of an offshore wind turbine, the tuned damper is installed inside the tower barrel. The tuned damper includes a connecting member, the upper end of the connecting member is fixed, a mass block is arranged at the lower end of the connecting member, and a water tank is installed on the connecting member, and the water tank is arranged above the mass block; An installation shaft and multiple annularly arranged partition plates are arranged inside the water tank. One transverse end of the partition plate is rotatably connected to the installation shaft, the other transverse end of the partition plate contacts the inner wall of the water tank, and grooves are formed at both longitudinal ends of the partition plate, and adjacent partition plates are communicated with each other.

[0007] Further, the connecting member includes a sling and a rigid connecting rod. The upper end of the sling is connected with a fixing member, the lower end of the sling is connected with a water tank, and the rigid connecting rod is used to connect the water tank and the mass block.

[0008] Further, the fixing member adopts a suspension beam, and the suspension beam is fixed on the inner wall of the tower barrel.

[0009] Furthermore, an anti-collision washer is provided on the outer circumference of the mass block, and the anti-collision washer is installed on the inner wall of the tower barrel.

[0010] Furthermore, multiple partitions inside the water tank are evenly arranged.

[0011] Furthermore, a water injection hole and a ventilation hole are opened at the top of the water tank.

[0012] Furthermore, the mass block is arranged in water, and the water tank is arranged on the water surface.

[0013] Furthermore, the mass block adopts a structure in which multiple spoiler plates are arranged in a ring.

[0014] In a second aspect, a working method of a tuned damper built in a monopile foundation for offshore wind power includes: Install the tuned damper on the tower barrel, obtain the damping force through the movement of the mass block installed at the lower end of the connecting piece. When the vibration frequency of the offshore wind turbine changes, change the mass of the water body in the water tank to change the position of the combined center of mass of the water tank and the mass block, and then change the frequency of the damper to achieve tuning.

[0015] Furthermore, the partitions in the water tank are used to reduce the force exerted on the water tank by the water body when the water tank sways.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a tuned damper built in a monopile foundation for offshore wind power, which includes two parts of mass blocks. One part is located in the seawater inside the pile, and the interaction between the mass block and the water body is used to provide a restoring moment; the other part of the mass block is located below the suspension beam and in the air above the water body, and this part of the mass block is a water tank. By adjusting the amount of water injected into the water tank, the mass of the water tank is adjusted, and then the center position between the two mass blocks is adjusted to achieve the purpose of real-time tuning; the present invention has a simple structure, and a large damping force can be provided by the interaction between the spoiler mass block and the seawater in the pile without additional devices; at the same time, the present invention can change the frequency of the damper in real time to achieve the best damping effect, and has the advantages of high reliability.

[0017] Preferably, the mass block adopts a structure in which multiple spoiler plates are connected and arranged in a ring, which increases the contact area with the water body, enhances the damping effect, and more effectively consumes the vibration energy, enabling the vibration of the system to decay faster; at the same time, the spoiler plates arranged in a ring make the flow of the water body more complex, forming multiple local eddy regions, and these eddies will increase the friction and energy loss inside the oil body, further improving the damping performance, and helping to more accurately control the amplitude and frequency of the vibration.

[0018] The present invention provides a working method for an in - built tuned damper in a monopile foundation of an offshore wind turbine. By adjusting the amount of water injected into the water tank, the mass of the water tank is increased, and then the central position between the two mass blocks is adjusted to achieve the purpose of real - time tuning.

[0019] Preferably, partitions are arranged in the water tank to reduce the force exerted on the water tank by the water body in the water tank when the water tank shakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of an in - built tuned damper in a monopile foundation of an offshore wind turbine according to the present invention; Figure 2 It is an installation schematic diagram of an in - built tuned damper in a monopile foundation of an offshore wind turbine according to the present invention; Figure 3 It is a schematic diagram of the water tank structure.

[0021] Among them, 1. Suspension beam; 2. Connection block; 3. Suspension cable; 4. Rigid connecting rod; 5. Water tank; 6. Partition; 7. Installation shaft; 8. Water injection hole; 9. Vent hole; 10. Mass block; 11. Anti - collision gasket; 12. Tower barrel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following specific embodiments are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] A damper is a device used to dissipate vibration energy, reduce the vibration amplitude, and suppress the vibration of a structure. It mainly uses various physical mechanisms to convert the mechanical energy of vibration into other forms of energy, usually heat energy or other dissipative forms, so as to attenuate the vibration.

[0028] In the field of offshore wind power structures, conventional dampers require a viscous cylinder to provide additional damping force. Among them, the viscous cylinder mainly includes a cylinder block, a piston, a piston rod, and an end cover. Based on the Newtonian internal friction law of viscous fluids, when the piston in the cylinder moves in the viscous fluid, a resistance proportional to the piston movement speed will be generated inside the fluid. The method of using a viscous cylinder to generate damping force has the problems of complex structure and poor reliability.

[0029] The present invention provides an in-built tuned damper for an offshore wind power monopile foundation, as Figure 1 shown, including a mass block 10. A connecting piece is installed at the upper end of the mass block 10, and a water tank 5 is installed on the connecting piece. The upper end of the connecting piece is fixed on the inner wall of the tower barrel 12, and the water tank 5 is directly above the mass block 10 in the vertical direction; As Figure 3 shown, the water tank 5 is of a disc-shaped structure. An installation shaft 7 is provided at the center of the water tank 5, and a plurality of annularly arranged partition plates 6 are installed on the installation shaft 7, that is, one end of the partition plate 6 in the horizontal direction is fixed on the installation shaft 7, and the other end of the partition plate 6 in the horizontal direction is in contact with the side wall of the water tank 5. The plurality of partition plates 6 divide the water tank 5 into multiple spaces, and adjacent two partition plates 6, that is, adjacent two spaces, are connected. To ensure the communication between the spaces on both sides of the partition plate 6, grooves are respectively opened at the upper and lower ends of the partition plate 6 in the vertical direction; By changing the mass of the water body in the water tank 5, the position of the combined center of mass of the mass block 10 and the water tank 5 is changed, and then the frequency of the damper is changed to achieve tuning. In addition, partition plates 6 are provided in the water tank 5. The plurality of fixed partition plates 6 divide the water in the water tank 5 into multiple small areas. When the water tank 5 shakes, the interaction and flow of the water bodies in each area are restricted, so as to disperse and buffer the impact force of the water body on the side wall of the water tank 5, and then reduce the force generated by the water body on the water tank 5 when the water tank 5 shakes.

[0030] The present invention effectively reduces the wind turbine loads and environmental loads such as waves by increasing damping, thereby improving the safety and stability of the offshore wind power support structure. Meanwhile, the damper should have the advantages of simple structure, high reliability, and real-time tunable frequency to adapt to the complex and changeable operating environment at sea, reduce the maintenance cost, and enhance the overall economic benefits of offshore wind power.

[0031] Embodiment 1 The present invention provides a tuned damper built into a monopile foundation for offshore wind power, which includes a water tank 5, a mass block 10, a connecting member, and a fixing member at the upper end. Among them, the upper end of the connecting member is connected to the fixing member, the lower end of the connecting member is connected to the mass block 10, and a water tank 5 for tuning is installed on the connecting member; As Figure 2 It can be seen from the schematic diagram of the usage environment of the tuned damper built into the monopile foundation for offshore wind power as shown that both the fixing member and the water tank 5 are located above the water surface, the mass block 10 is immersed in the water to provide damping force, and the water body inside the water tank 5 is used to cooperate with the mass block 10 to change the position of the combined centroid; An optional way to change the magnitude of the damping force is to change the degree to which the mass block 10 is immersed in the water, that is, to change the damping force of the tuned damper by changing whether the mass block 10 is completely immersed or partially immersed in the water.

[0032] As a preferred method, the mounting shaft 7 in the water tank 5 is fixed at the central position of the water tank 5, multiple partition plates 6 are fixed on the mounting shaft 7, the multiple partition plates 6 in the water tank 5 are evenly arranged, a water injection hole 8 and a ventilation hole 9 are opened at the top of the water tank 5, the water injection hole 8 is used to connect with an external water injection or pumping system, and according to the actual needs of tuning, water is added to or pumped out of the water tank 5 through the water injection hole 8 to change the mass of the water tank 5. The function of the ventilation hole 9 is to ensure the normal air pressure inside the water tank 5, ensure that the water injection and pumping operations can be completed smoothly, and avoid the air pressure affecting the efficiency of water injection or pumping.

[0033] Specifically, the pumping or water injection system consists of a controller, a water pump, a pipeline, and a controller. The controller is connected to the built-in acceleration sensor of the unit to obtain the vibration frequency data of the support structure in real time. When the sensor detects a change in the frequency of the support structure, the controller calculates the amount of water that needs to be injected into or pumped out of the water tank according to a preset algorithm, and controls the start, stop, and pumping or water injection flow rate of the water pump. The pipeline system is responsible for transporting water to or from the water tank to ensure smooth water flow; Furthermore, a pressure sensor and a flow sensor are installed on the pipeline to monitor the pressure and flow rate of the water flow in real time and feedback them to the controller so that the controller can precisely control the pumping system.

[0034] Embodiment 2 A tuned damper built into a monopile foundation for offshore wind power, as Figure 2As shown in the figure, it includes a connecting member. Specifically, the connecting member includes a sling 3 and a rigid connecting rod 4. The fixing member at the upper end of the connecting member uses a suspension beam 1, and the suspension beam 1 is welded inside the tower barrel 12. A box-section steel beam is used. This structural design can provide sufficient strength and stiffness to ensure stable support for other components in a complex offshore environment; The upper end of the sling 3 is connected to the suspension beam 1 through a connecting block 2. The lower end of the sling 3 is connected to the top cover of the water tank 5. The bottom surface of the water tank 5 is connected to the top end of the mass block 10 through a rigid connecting rod 4 to ensure the stable transmission of the acting force between the two.

[0035] In an optional implementation manner, the mass block 4 adopts a structure in which multiple spoiler plates are connected in a circular arrangement. The circular structure formed by connecting multiple spoiler plates increases the contact area with the damping oil body. When the mass block 4 moves in water, it will drive more water bodies to flow, thereby generating greater resistance, enhancing the damping effect, more effectively consuming vibration energy, enabling the vibration of the system to decay faster. At the same time, the spoiler plates arranged in a circular shape make the flow of the water body more complex, forming multiple local eddy regions. These eddies will increase the internal friction and energy loss of the water body, further improving the damping performance, and helping to more accurately control the amplitude and frequency of vibration; In addition, the circular structure formed by connecting multiple spoiler plates increases the overall stiffness and stability of the spoiler mass block; The spoiler plates arranged in a circular shape can respond to vibrations in different directions in all directions. For complex and multi-directional vibrations, the mass block 4 with a circular structure can provide effective damping in all directions. Whether the vibration comes from the horizontal direction, the vertical direction or any other arbitrary angle, it can achieve a good vibration reduction effect, improving the adaptability of the system to different vibration conditions; Optionally, the number, shape, size, spacing and connection method of the spoiler plates can be changed to optimize and adjust the damping characteristics. Increase or decrease the number of spoiler plates according to specific damping requirements, and adjust the inclination angle of the spoiler plates to achieve the adjustment of the damping force; Furthermore, the design of multiple spoiler plates can also adjust or replace local spoiler plates without replacing the entire spoiler mass block, reducing the maintenance and adjustment costs and improving the maintainability of the system.

[0036] The present invention provides an in-pile tuned mass damper for an offshore wind turbine monopile foundation. Through the combined design of the upper water tank and the lower spoiler mass block, it uses the seawater medium to provide damping force, provides damping force by utilizing the interaction between the seawater medium in the pile and the mass block 10, and combines the adjustable mass of the water tank 5 to achieve real-time frequency matching, so as to solve the problems of traditional dampers relying on external devices and insufficient frequency modulation ability; the device has a simple structure and does not require external power, can significantly reduce the vibration load of the offshore wind power support structure, and improve the operation safety and economy.

[0037] Example 3 An offshore wind power monopile foundation with an internal tuned damper, which comprises a suspension beam 1, a connection block 2, a suspension cable 3, a rigid connecting rod 4, a water tank 5, a mass block 10, and an anti-collision guard ring 11; Among them, the suspension beam 1 is welded inside the tower barrel 12. The suspension beam 1 is a steel beam with a box-shaped cross-section. The cross-sectional size of the suspension beam 1 is designed according to the tower barrel diameter and load requirements, and stiffeners can be added inside to improve the stiffness; The connection block 2 is connected to the suspension beam 1 and is used to fix the suspension cable 3. The connection block 2 is fixed to the lower end of the suspension beam 1 by bolts or welding and is used to connect the suspension cable 3. The connection block 2 is made of high-strength alloy steel and its surface is anti-corrosion treated to cope with the high-humidity and high-salt environment of the sea. The lower part of the suspension cable 3 is connected to the water tank 5. The water tank 5 is located inside the tower barrel 12 and above the water surface; The mass block 10 is located in the water. The mass block 10 can be a cube, or can be in the shapes of a cylinder, a sphere, etc. The mass block 10 is located in the water. The mass block 10 can be in the form of multiple spoiler plates arranged annularly, or can be in the form of a cylinder with holes or a cube with holes. The mass block 10 mainly increases the movement resistance of the mass block 10 through the form of its own turbulence with the water body, thereby increasing the restoring force of the damper.

[0038] In an optional implementation manner, the spoiler mass block 4 adopts a box-type spoiler structure. The spoiler mass block 4 increases the movement resistance of the spoiler mass block 4 through the form of its own turbulence with the damping oil body, thereby increasing the restoring force of the damper.

[0039] At the height of the mass block 10, an anti-collision guard ring 11 is installed inside the monopile foundation to prevent the mass block 10 from directly colliding with the steel pipe pile. The anti-collision guard ring 11 can be annular, or can be composed of several strip-shaped rubber strips arranged evenly along the circumference.

[0040] Furthermore, when the support structure of the wind turbine changes in frequency due to reasons such as seabed scouring, marine organism attachment, and structural corrosion, the frequency of the damper can be adjusted by changing the mass of the water tank 5.

[0041] In summary, the tuned damper built into the monopile foundation of the offshore wind turbine provided by the present invention includes two parts of mass blocks. One part is located in the seawater inside the pile, and through the interaction between the mass block 10 and the water body, a restoring moment is provided; the other part of the mass block 10 is located below the suspension beam 1 but in the air above the water body, and this part of the mass block is a water tank 5. By adjusting the amount of water injected into the water tank 5, the mass of the water tank 5 is increased, and then the center position between the two mass blocks is adjusted to achieve the purpose of real-time tuning. The present invention has the advantages of simple structure, large damping force can be provided by the interaction between the mass block 10 and the seawater in the pile, and no additional device is required; at the same time, the present invention can change the frequency of the damper in real time to achieve the best damping effect, and has high reliability and other advantages.

[0042] The present invention also provides a working method for the tuned damper built into the monopile foundation of the offshore wind turbine, specifically as follows: Install the tuned damper in the tower barrel 12, and obtain the damping force through the movement of the mass block 10 installed at the lower end of the connecting piece. When the vibration frequency of the offshore wind turbine changes, by changing the mass of the water body in the water tank 5, the position of the combined center of mass of the water tank 5 and the mass block 5 is changed, and then the frequency of the damper is changed to achieve tuning; A plurality of partition plates 6 are installed in the water tank 5, and through the action of the partition plates 6 in the water tank 5, the acting force generated by the water body on the water tank 5 when the water tank 5 shakes can be reduced.

[0043] Use the built-in acceleration sensor of the unit to obtain the first-order vibration frequency of the support structure. When the first-order vibration frequency of the unit changes, the pumping system automatically works to inject water into or pump water from the water tank 5 to achieve the purpose of changing the mass of the damper and the overall center of mass, and then achieve the purpose of adjusting the frequency of the damper.

[0044] After the damper is installed, adjust the first-order frequency of the damper to the first-order frequency of the offshore wind power support structure, and this frequency is the frequency measured by the unit sensor; Specifically, the frequency range of the damper is designed to be 0.15Hz to 0.4Hz. In the design stage of the offshore wind power structure, obtain the first-order frequency of the offshore wind power support structure, and immediately adjust the first-order frequency of the damper to the design frequency of the support structure. When the damper is installed, according to the measured frequency of the support structure, by changing the mass of the water tank 5, the frequency of the damper is adjusted to match the first-order frequency of the support structure. When phenomena such as corrosion of the foundation, attachment of marine organisms, and foundation scour occur, the overall frequency of the wind turbine will change. By injecting water into or pumping water from the water tank through the water injection hole, the frequency of the entire damper can be changed, and then the purpose of real-time tuning can be achieved.

[0045] In an optional implementation manner, the specific tuning steps are as follows: Before the damper leaves the factory, according to the design frequency of the offshore wind power support structure, the initial mass of the upper water tank 5 mass block (such as preloading a certain amount of water) and the sling length are adjusted to preliminarily adjust the frequency of the damper to be consistent with the design frequency of the support structure. During the adjustment process, professional measuring equipment and calculation models are used to accurately measure and calculate the frequency of the damper to ensure the accuracy of the adjustment; After the damper is installed on the offshore wind power support structure, the built-in acceleration sensor of the unit is used to measure the actual first-order vibration frequency of the support structure. Since there may be a deviation between the actual structure frequency and the design frequency, at this time, start the pumping system, and according to the difference between the measured frequency and the design frequency, inject water or pump water into the water tank 5 to adjust the mass of the water tank 5, and then adjust the frequency of the damper to be consistent with the measured frequency of the unit support structure; During the operation of the unit, continuously use the built-in acceleration sensor of the unit to monitor the frequency of the support structure. When it is found that the frequency of the support structure changes due to environmental factors such as foundation corrosion, attached marine organisms, and foundation scouring, immediately start the pumping system, inject water or pump water into the water tank according to the frequency change amount, and adjust the frequency of the damper in real time to ensure that the damper frequency is always consistent with the unit support structure frequency.

[0046] Preferably, a frequency change monitoring database is established to analyze the change trend of the support structure frequency, providing data support for subsequent maintenance and optimization.

[0047] The present invention also provides an installation method for an in-built tuned damper in an offshore wind power monopile foundation, including the following steps: According to the design frequency of the offshore wind power support structure, accurately calculate and determine the mass of the damper and the length of the sling 3. For the suspension beam 1, select a steel box girder with a suitable specification, cut and weld it according to the design dimensions to ensure that its strength and accuracy meet the requirements; Roll and weld the plates of the cylindrical steel box body to form the main body of the water tank 5. Weld the partition 6 inside the water tank 5 at the designed position, and open grooves at the longitudinal two ends of the partition 6 to ensure the water and air passage in the upper and lower parts of the partition 6. Open a water injection hole 8 and a ventilation hole 9 on the upper part of the upper water tank 5 mass block, and install corresponding valves and connecting pipes for subsequent connection with the pumping system; Process the mass block 10 into a cube or cylinder shape according to the design requirements. Use suitable steel to ensure that the mass block 10 has sufficient strength and weight to ensure that effective damping force can be generated when interacting with the water body.

[0048] First, weld the suspension beam 1 to the designed position inside the tower barrel 12 to ensure its verticality and levelness. Then install the connecting block 2 to firmly connect it with the suspension beam 1, and ensure the accurate position of the installation hole of the suspension cable 3. Connect one end of the suspension cable 3 to the suspension beam 1 and the other end to the mass block of the upper water tank 5. Then connect the mass block of the upper water tank 5 and the lower mass block 10 through the rigid connecting rod 4. Finally, install the anti-collision guard ring 11 at the height position corresponding to the lower mass block 10 inside the tower barrel 12; The anti-collision guard ring 11 can select the arrangement mode of annular or strip-shaped rubber strips according to the actual situation.

[0049] The present invention adjusts the position of the combined centroid of the two mass blocks by changing the water mass in the water tank 5, and further realizes the real-time adjustment of the damper frequency. This tuning method can enable the damper to always match the frequency of the support structure under different working conditions, ensure the best damping effect, and improve the adaptability and reliability of the damper.

[0050] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention, including the combination of each technical feature in any other suitable way. These simple modifications and combinations should also be regarded as the disclosed content of the present invention and fall within the protection scope of the present invention.

Claims

1. An offshore wind power monopile foundation with a built-in tuned damper, characterized in that: The tuned damper is installed in the tower (12), the tuned damper comprising a connecting member, the upper end of the connecting member is fixed, a mass block (10) is arranged at the lower end of the connecting member, a water tank (5) is installed on the connecting member, and the water tank (5) is arranged above the mass block (10); The water tank (5) is provided with a mounting shaft (7) and a plurality of annularly arranged partitions (6), one transverse end of the partition (6) is fixed on the mounting shaft (7), and the other transverse end of the partition (6) contacts the inner wall of the water tank (5), and both longitudinal ends of the partition (6) are provided with grooves, and adjacent partitions (6) are connected to each other.

2. The built-in tuned damper of an offshore wind power monopile foundation according to claim 1 is characterized in that: The connecting member comprises a sling (3) and a rigid connecting rod (4); the upper end of the sling (3) is connected to a fixing member, the lower end of the sling (3) is connected to a water tank (5), and the rigid connecting rod (4) is used to connect the water tank (5) and the mass block (10).

3. The built-in tuned damper of an offshore wind power monopile foundation according to claim 2 is characterized in that: The fixing member is a suspension beam (1), and the suspension beam (1) is fixed on the inner wall of the tower (12).

4. The built-in tuned damper of an offshore wind power monopile foundation according to claim 1 is characterized in that: An anti-collision washer (11) is provided on the outer circumference of the mass block (10), and the anti-collision washer (11) is mounted on the inner wall of the tower (12).

5. The built-in tuned damper of an offshore wind power monopile foundation according to claim 1 is characterized in that: The plurality of partitions (6) inside the water tank (5) are evenly arranged.

6. The built-in tuned damper and working method of an offshore wind power monopile foundation according to claim 5, characterized in that: The top of the water tank (5) is provided with a water injection hole (8) and a ventilation hole (9).

7. The built-in tuned damper of an offshore wind power monopile foundation according to claim 1 is characterized in that: The mass block (10) is arranged in water, and the water tank (5) is arranged on the water surface.

8. An offshore wind power monopile foundation with a built-in tuned damper according to claim 1 or 7, characterized in that: The mass block (10) adopts a structure in which a plurality of spoilers are arranged in a ring.

9. A working method of a built-in tuned damper in an offshore wind power monopile foundation, characterized in that: The built-in tuned damper of the offshore wind power monopile foundation according to any one of claims 1 to 8 comprises: A tuning damper is installed in a tower (12), and a damping force is obtained by moving a mass block (10) installed at the lower end of a connecting member. When the vibration frequency of the offshore wind turbine generator set changes, the position of the combined mass center of the water tank (5) and the mass block (10) is changed by changing the mass of the water body in the water tank (5), thereby changing the frequency of the damper and achieving tuning.

10. A method for operating a tuned damper built into an offshore wind power monopile foundation according to claim 9, characterized in that: The partition plate (6) in the water tank (5) is used to reduce the force exerted by the water on the water tank (5) when the water tank (5) shakes.

Images