C-shaped granular damping device for offshore wind power structure vibration reduction

Abstract

A C-shaped particle damping device for damping offshore wind power structure belongs to the technical field of wind power energy saving, which comprises a tower wall, a C-shaped particle damping cavity, a spring damping rod, a universal wheel and a limiter, the C-shaped particle damping cavity and the tower wall are connected through a plurality of spring damping rods, the spring damping rod fixers provided at the two ends of the spring damping rod are respectively welded on the outer side of the C-shaped particle damping cavity and the inner side of the tower wall, particles are loaded in the particle damping chamber in the C-shaped particle damping cavity, and a plurality of limiters are installed on the inner side of the tower wall to avoid the C-shaped particle damping cavity from colliding with the tower wall in the case of excessive displacement. The damper and the particles in the particle damping chamber consume energy by mutual friction and collision, the universal wheel can move the C-shaped particle damping cavity in all directions, control the vibration in multiple directions, and ensure better stability and safety of the whole device.

Description

Technical Field

[0001] This invention belongs to the field of wind power energy-saving technology and relates to a C-shaped particle damping device for vibration reduction of offshore wind turbine structures. Utilizing its own mass and spring damping rod, it can act as a frequency-modulated mass damper. The friction and collision between the particles inside can consume a large amount of energy, increasing vibration reduction efficiency. Moreover, the special C-shaped structure allows it to adapt well to the special spatial form of the platform inside the offshore wind turbine tower. This vibration reduction device can significantly reduce wind turbine vibration, extend fatigue life, increase service life, and reduce wind power costs. Background Technology

[0002] As offshore wind power construction gradually moves into deeper waters, the natural environment becomes harsher, and the environmental loads become more severe. Furthermore, the increasing demand for electricity has led to wind turbines becoming increasingly higher in wattage, resulting in taller towers. This significantly increases the structural flexibility, requiring more steel to enhance rigidity and indirectly increasing the cost per kilowatt-hour. Suitable vibration damping devices could reduce construction costs. In addition, the current lack of suitable vibration damping devices to control vibrations under complex environmental loads hinders further increases in tower height, as blindly increasing tower height can easily lead to serious turbine accidents. Offshore wind turbines have a service life of 25-30 years. Controlling vibrations through vibration damping devices can extend fatigue life and increase service life. Currently available dampers are not well-suited to the confined spaces of offshore wind turbines and cannot control vibrations in multiple directions. Summary of the Invention

[0003] To address the aforementioned engineering challenges and problems, this invention proposes a C-shaped particle damping device suitable for vibration reduction in offshore wind turbine structures. This structure can be well integrated into the platform of the offshore wind turbine tower and can control vibrations in multiple directions, giving the wind turbine stronger resistance to wind and waves during its service life. This ensures better stability and safety, extends its fatigue life, increases its service life, reduces the probability of accidents, lowers construction costs, and consequently reduces the cost per kilowatt-hour. The technical solution adopted is as follows:

[0004] A C-shaped particle damping device for vibration reduction of offshore wind power structures includes a tower wall, a C-shaped particle damping cavity, particles, spring damping rods, casters, and limiters. The tower wall has a deck, and the bottom of the C-shaped particle damping cavity is equipped with several casters, allowing the C-shaped particle damping cavity to be placed on the deck. The C-shaped particle damping cavity and the tower wall are connected by several spring damping rods. Spring damping rod retainers at both ends of the spring damping rods are welded to the outer side of the C-shaped particle damping cavity and the inner side of the tower wall, respectively, and the two ends of the spring damping rods are rotatably connected to the spring damping rod retainers. The particle damping chambers within the C-shaped particle damping cavity contain particles, and several limiters are installed on the inner side of the tower wall to prevent the C-shaped particle damping cavity from colliding with the tower wall due to excessive displacement.

[0005] Furthermore, the C-shaped particle damping cavity has an opening of 60°, with a row of particle damping chambers spaced 30° apart. Each row has at least 5 layers of particle damping chambers, and 2 casters are installed directly below each row of particle damping chambers in the C-shaped particle damping cavity.

[0006] Furthermore, a cable hole is opened in the middle of the deck for transmitting cables. An engine room ladder is installed on the deck near the cable hole. A ladder access hole is opened on the deck on one side of the engine room ladder, and a ladder is installed in the ladder access hole.

[0007] Furthermore, the limiter consists of a limiter piston, a limiter spring, and a limiter retainer. One end of the limiter piston is placed inside the limiter retainer, and the other end is used to resist the excessive displacement of the C-shaped particle damping cavity. The limiter spring is placed inside the limiter to provide a buffering effect. The limiter is welded to the inner side of the tower wall through the limiter retainer.

[0008] Furthermore, there are eight spring damping rods, arranged in pairs in parallel, not perpendicular to the tower wall.

[0009] Furthermore, the rotating holes at both ends of the spring damping rod are connected to the spring damping rod retainer through a rotating rod, and the connected spring damping rod and the spring damping rod retainer rotate axially through the rotating rod.

[0010] Furthermore, the cabin ladder and ladder access hole are both located on the C-shaped opening side of the C-shaped particle damping cavity.

[0011] The technical effects of this invention are as follows: The C-shaped particle damping device proposed in this invention is suitable for vibration reduction of offshore wind power structures. This structure can be well placed inside the platform of the offshore wind turbine tower. It acts as a frequency-modulated mass damper through the cooperation of its own mass and spring damping rod. The particles inside collide and rub against each other, increasing energy consumption. The casters at the bottom of the C-shaped particle damping cavity allow the C-shaped particle damping cavity to move in various directions, controlling vibrations in multiple directions. This gives the wind turbine stronger resistance to wind and waves during its service life, thereby ensuring better overall stability and safety of the device, extending its fatigue life, increasing its service life, reducing the probability of accidents, reducing construction costs, and thus reducing the cost per kilowatt-hour. The above beneficial effects demonstrate that this solution has good engineering application prospects. Attached Figure Description

[0012] Figure 1 Top view of the particle damper structure on the wind turbine tower platform;

[0013] Figure 2 A three-dimensional view of the particle damper structure on the wind turbine tower platform;

[0014] Figure 3 A three-dimensional perspective view of a C-shaped particle damping cavity;

[0015] Figure 4 A three-dimensional view of the spring damping rod;

[0016] Figure 5 This is a three-dimensional view of the limiter;

[0017] Figure 6 This is a 3D view of the omnidirectional wheel.

[0018] In the diagram: 1. Cable hole; 2. Cable; 3. Tower wall; 4. Spring damping rod; 5. Limiter; 6. C-shaped particle damping cavity; 7. Particle; 8. Ladder access hole; 9. Ladder; 10. Engine room ladder; 11. Deck; 12. Caster wheel; 13. Particle damping chamber; 14. Damper; 15. Vibration damping spring; 16. Rotation hole; 17. Rotation rod; 18. Spring damping rod retainer; 19. Limiter spring; 20. Limiter piston; 21. Limiter retainer. Detailed Implementation

[0019] To further understand the innovative aspects of this invention, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0020] Please see Figure 1 and Figure 2In the initial state of this design, the inner diameter of the tower wall 3 of the offshore wind power generation tower platform is 3.2m. A 60cm diameter cable hole 1 is opened in the middle of its deck 11 for transmitting cables 2. A nacelle ladder 10 is installed next to it. The nacelle ladder 10 is installed on the deck 11 near the cable hole 1 for maintenance and repair of cables 2 and other components. A 70cm wide ladder access hole 8 is opened on one side of the deck 11 near the tower wall 3. A ladder 9 is installed inside the ladder access hole 8, allowing personnel to ascend through the ladder access hole 8 to reach the deck 11. The C-shaped particle damping cavity 6 has an outer diameter of 2.3m and an inner diameter of 1.3m. It is 135cm away from the cable hole and 345cm away from the tower wall. The bottom of the C-shaped particle damping cavity 6 is equipped with 20 casters 12, which allows the C-shaped particle damping cavity 6 to move in all directions. The C-shaped particle damping cavity 6 and the tower wall 3 are connected by 8 spring damping rods 4, each 60cm long. The spring damping rods 4 are not perpendicular to the tower wall 3, but are arranged in pairs parallel to each other, so that the installed spring damping rods 4 form a certain angle with the outer arc tangent of the tower wall 3. The spring damping rod retainers 18 at both ends of the spring damping rod 4 are welded to the outer side of the C-shaped particle damping cavity 6 and the inner side of the tower wall 3, respectively. The two ends of the spring damping rod 4 can rotate without affecting the movement of the C-shaped particle damping cavity 6 in all directions. Under the condition of wind turbine vibration, the C-shaped particle damping cavity 6 and the spring damping rod 4 act as a frequency-modulated mass damper. Four 15cm long limiters 5 are installed on the inner side of the tower wall 3 to prevent the C-shaped particle damping cavity 6 from colliding with the tower wall 3 under excessive displacement, thus preventing structural damage.

[0021] See Figure 3 The C-shaped particle damping cavity 6 has an opening of 60° and a solid area of ​​300°. Particle damping chambers 13 are arranged in 10 rows at 30° intervals, with each row containing 5 layers of particle damping chambers 13, totaling 50 particle damping chambers 13. The C-shaped particle damping cavity 6 is 72cm high, and the internal space of each layer of particle damping chambers 13 is 12cm high. The wall thickness of each particle damping chamber 13 is 2cm. Particles 7 are placed in the particle damping chambers 13 within the C-shaped particle damping cavity 6. The particles 7 can rub and collide with each other to dissipate energy. The number, diameter, and material of the particles 7 can be adjusted according to the vibration damping target. Of course, the above arrangement of the particle damping chambers 13 and particles 7 is merely a preferred embodiment of the present invention. The present invention is not limited to the above arrangement of the particle damping chambers 13 and can be improved according to different environments or the needs of the fan. Energy consumption can be controlled by adjusting the size and number of the particle damping chambers 13 and the filling rate of the particles 7.

[0022] Based on the structure of the C-shaped particle damping cavity 6, the cabin ladder 10 and ladder access hole 8 of the present invention are both set on the C-shaped opening side of the C-shaped particle damping cavity 6, which makes reasonable use of space and makes it convenient for personnel to go up and down.

[0023] See Figure 1 and Figure 4 The spring damping rod 4 is mainly composed of a damper 14 and a vibration damping spring 15, which can be compressed to a maximum of 30cm. The vibration damping spring 15 is sleeved on the outside of the damper 14. The spring damping rod 4 has rotating holes 16 at both ends, which can be connected to the spring damping rod fixer 18 through a rotating rod 17. After connection, the spring damping rod 4 and the spring damping rod fixer 18 can rotate axially through the rotating rod 17 to realize the rotation function of the spring damping rod 4, thus not affecting the movement of the C-shaped particle damping cavity 6 in all directions. The spring damping rod fixers 18 at both ends of the spring damping rod 4 are welded to the outside of the C-shaped particle damping cavity 6 and the inside of the tower wall 3. In this invention, the elastic coefficient and damping coefficient of the spring damping rod 4 can be adjusted as needed to control different types of wind turbine vibration.

[0024] See Figure 1 and Figure 5 The limiter 5 consists of a limiter piston 20, a limiter spring 19, and a limiter retainer 21. It is 20cm long when uncompressed and can be compressed to a maximum of 12cm. One end of the limiter piston 20 is placed inside the limiter retainer 21, and the other end is used to abut against the excessively displaced C-shaped particle damping cavity 6. The limiter spring 19 is placed inside the limiter 5 to provide a buffering effect and prevent damage to the device structure and components. The limiter 5 is welded to the inner side of the tower wall 3 via the limiter retainer 21. This invention has at least four limiters 5, equidistantly arranged on the inner side of the tower wall 3.

[0025] See Figure 2 and Figure 6 Two casters 12 are installed directly below each row of particle damping chambers 13 in the C-shaped particle damping cavity 6. A total of 20 casters 12 are installed at the bottom of the C-shaped particle damping cavity 6, so that the C-shaped particle damping cavity 6 can move in all directions, thereby controlling the vibration in each direction.

[0026] The C-shaped particle damping device of this invention can be installed inside the platform of the offshore wind turbine tower to control vibrations in multiple directions, giving the wind turbine stronger resistance to wind and waves during its service life, thereby ensuring better stability and safety, extending its fatigue life, increasing its service life, and reducing the probability of accidents.

Claims

1. A C-shaped particle damping device for vibration reduction of offshore wind power structures, characterized in that: Including tower The tower wall (3), C-shaped particle damping cavity (6), particles (7), spring damping rods (4), casters (12), and limiters (5) are provided. The tower wall (3) is equipped with a deck (11). Several casters (12) are installed at the bottom of the C-shaped particle damping cavity (6) so that the C-shaped particle damping cavity (6) is placed on the deck (11) through the casters (12). The C-shaped particle damping cavity (6) and the tower wall (3) are connected by several spring damping rods (4). 4) The spring damping rod holders (18) provided at both ends are welded to the outer side of the C-shaped particle damping cavity (6) and the inner side of the tower wall (3) respectively. The two ends of the spring damping rod (4) are rotatably connected to the spring damping rod holders (18). The particle damping chamber (13) inside the C-shaped particle damping cavity (6) is filled with particles (7). Several limiters (5) are installed on the inner side of the tower wall (3) to prevent the C-shaped particle damping cavity (6) from colliding with the tower wall (3) under excessive displacement. The opening of the C-shaped particle damping cavity (6) is 60°, and a row of particle damping chambers (13) is divided every 30°. Each row has at least 5 layers of particle damping chambers (13). Two casters (12) are installed directly below each row of particle damping chambers (13) in the C-shaped particle damping cavity (6). The limiter (5) consists of a limiter piston (20), a limiter spring (19) and a limiter retainer (21). One end of the limiter piston (20) is placed inside the limiter retainer (21), and the other end is used to resist the excessive displacement of the C-shaped particle damping cavity (6). The limiter spring (19) is placed inside the limiter (5) to buffer the movement. The limiter (5) is welded to the inner side of the tower wall (3) through the limiter retainer (21). There are 8 spring damping rods (4), which are divided into four groups. The spring damping rods (4) in each group are arranged in parallel pairs and are not perpendicular to the tower wall (3). The C-shaped particle damping device is installed inside the platform of the offshore wind turbine tower to control vibrations in multiple directions.

2. The C-shaped particle damping device for vibration reduction of offshore wind power structures according to claim 1, characterized in that: A cable hole (1) is opened in the middle of the deck (11) for transmitting cables (2). A cabin ladder (10) is installed on the deck (11) near the cable hole (1). A ladder access hole (8) is opened on the deck (11) on one side of the cabin ladder (10) to penetrate the deck (11). A ladder (9) is installed in the ladder access hole (8).

3. The C-shaped particle damping device for vibration reduction of offshore wind power structures according to claim 1, characterized in that: The rotating holes (16) at both ends of the spring damping rod (4) are connected to the spring damping rod holder (18) through the rotating rod (17). After connection, the spring damping rod (4) and the spring damping rod holder (18) rotate circumferentially through the rotating rod (17).

4. The C-shaped particle damping device for vibration reduction of offshore wind power structures according to claim 2, characterized in that: The cabin ladder (10) and the ladder access hole (8) are both located on the C-shaped opening side of the C-shaped particle damping cavity (6).

5. The C-shaped particle damping device for vibration reduction of offshore wind power structures according to claim 2, characterized in that: At least four limiters (5) are provided, and they are equidistantly arranged on the inner side of the tower wall 3.

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