oscillation damping

Abstract

The present disclosure relates to a damping system for counteracting oscillations in a structure. The damping system comprises a pendulum device and a container containing a viscous medium. The pendulum device comprises a mass body comprising a porous structure. The porous structure is configured to allow the viscous medium to pass through it. The porous structure is at least partially immersed in the viscous medium.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a damping system for counteracting oscillations in a structure, and in particular for counteracting oscillations in a wind turbine tower. The present disclosure also relates to a wind turbine tower comprising such a damping system, and to a method for counteracting oscillations in a structure. BACKGROUND

[0002] High structures, such as towers, in particular wind turbine towers, are susceptible to oscillations. These oscillations can be induced by external forces, such as wind, waves, earthquakes, etc. Due to the induced oscillations, the structure can start to oscillate significantly, in particular if the induced oscillations correspond to the natural frequency of the structure. These high amplitude oscillations can lead to damage, reduced lifetime or failure of the structure.

[0003] High structures, such as modern wind turbines, are typically used to supply power to an electrical grid. This type of wind turbine generally comprises a wind turbine tower, also referred to as tower in the present disclosure, and a rotor arranged on the tower. The rotor, typically comprising a hub and a plurality of blades, starts to rotate under the influence of the wind on the blades. The rotation generates a torque which is transmitted to a generator, typically directly through a rotor shaft or by using a gearbox. In this way, the generator generates power which can be supplied to the electrical grid.

[0004] Wind turbines can be exposed to harsh conditions in onshore and offshore applications. In particular, vortex-induced oscillations and offshore wave loading can be critical load cases for wind turbines. These load cases, e.g. vortexes at the upper part of the wind turbine tower, can lead to lateral oscillations of the wind turbine, which can be decisive for the critical bending loads of the wind turbine tower. In operation, the wind turbine can also reach a certain operational rotor speed which leads to resonance.

[0005] These oscillations increase the fatigue damage of the structure, which can lead to catastrophic failure. In case of too high stresses in the tower structure, the tower can uncontrollably buckle and / or kink. Due to the general trend of increasing the size of modern wind turbines, the wind turbine towers are also increasing in size and have an increasingly large mass on top of the tower. In addition, towers are becoming increasingly high and slender, which lowers their natural frequencies and leads to resonance at more common wind and wave frequencies. This leads to a greater challenge to ensure the stability of these structures under the above-mentioned critical load cases.

[0006] Optimizing the tower structure alone, e.g. by adding additional reinforcements, is limited by feasibility, efficiency and economic factors. Therefore, additional systems for effectively counteracting oscillations, such as vortex-induced oscillations and wave loading in offshore applications, are essential for the safety and durability of wind turbines.

[0007] In the art, different approaches have been applied in order to counteract oscillations of wind turbines. Using aerodynamic solutions represents one option. The aim of aerodynamic solutions is to reduce oscillations by limiting the formation mechanism of oscillations, for example by suppressing vortex appearance. Examples include helical strakes or fins mounted on the wind turbine tower. However, in certain use cases, aerodynamic solutions can not be sufficient on their own.

[0008] Furthermore, in the prior art, oscillation dampers such as rolling mass dampers or tuned mass dampers are described. Unlike aerodynamic solutions, these oscillation dampers do not limit the formation mechanism of oscillations, but rather dampen the oscillations. This is generally achieved by the inertia of a movably mounted mass. However, damper implementations are limited by certain aspects. In particular, for wind turbines that are constantly increasing in size and mass, large-sized dampers with high mass are required. This leads to difficulties in terms of transport and / or installation, in particular when integrating the dampers inside the wind turbine tower. Furthermore, large and / or heavy oscillation dampers mean an additional loading on the tower structure and can lead to high costs due to the required material and extensive manufacturing.

[0009] The present disclosure provides a damping system for counteracting oscillations in a structure, which at least partially addresses the above-mentioned drawbacks. Although specific problems have been described with respect to wind turbine towers, it should be clear that the principles of the present disclosure can also be applied in other structures, including different towers and buildings. SUMMARY

[0010] In a first aspect of the present disclosure, a damping system for counteracting oscillations in a structure is provided. The damping system comprises a pendulum device and a container containing a viscous medium. The pendulum device comprises a mass, which comprises a porous structure. The porous structure is configured to allow the viscous medium to pass through it. Furthermore, the porous structure is at least partially immersed in the viscous medium.

[0011] The term "pendulum device" as used throughout the present disclosure does not limit the damping system in which the particular suspension system is implemented. Rather, any pendulum device with a mass that allows for oscillation is a pendulum device in the sense of the present disclosure.

[0012] Oscillations in the structure can be counteracted, i.e. minimized or at least partially reduced, due to the oscillating mass. By providing a mass comprising a porous structure that is at least partially immersed in a viscous medium, the oscillations can be further damped without the need to, for example, increase the mass of the damping system.

[0013] On the other hand, a tuned mass damper is provided for counteracting oscillations in a building. The tuned mass damper includes a suspended mass with a porous structure, wherein the porous structure is configured to interact with a viscous fluid such that when the suspended mass oscillates, the porous structure generates turbulence in the viscous fluid.

[0014] In another aspect, a method for counteracting oscillations in a building is provided. The method includes providing a mass and a viscous fluid to a container, wherein the mass includes a porous structure. The container with the viscous fluid can be installed inside the building, and the method further includes suspending the mass such that the porous structure of the mass is at least partially immersed in the viscous fluid. Attached Figure Description

[0015] In the following, aspects of this disclosure are described in detail with reference to the accompanying drawings.

[0016] Figure 1 A perspective view schematically illustrating an example of a wind turbine;

[0017] Figure 2 schematic diagram Figure 1 A simplified interior view of an example wind turbine nacelle;

[0018] Figure 3 The illustration schematically depicts an example of a damping system used to counteract oscillations in a building;

[0019] Figure 4A This schematically illustrates another example of a damping system used to counteract oscillations in a building;

[0020] Figure 4B This schematically illustrates another example of a damping system used to counteract oscillations in a building;

[0021] Figure 5A This schematically illustrates another example of a damping system used to counteract oscillations in a building;

[0022] Figure 5B This schematically illustrates another example of a damping system used to counteract oscillations in a building;

[0023] Figure 5C This schematically illustrates another example of a damping system used to counteract oscillations in a building;

[0024] Figure 6A to Figure 6B The schematic illustration shows an example of a wind turbine tower including the tower structure and damping system, and

[0025] Figure 7 A flowchart illustrating a method for counteracting vibrations in a building is shown schematically. Detailed Implementation

[0026] Reference will now be made in detail to embodiments of the invention, one or more of which are illustrated in the accompanying drawings. Each example is provided by way of explanation, not limitation, of the invention. Indeed, it will be apparent to those skilled in the art that various modifications and variations may be made to the invention without departing from the scope or spirit thereof. For example, a feature illustrated or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Corresponding combinations are explicitly part of this disclosure. Therefore, it is intended that the invention cover such modifications and variations and their equivalents as fall within the scope of the appended claims.

[0027] Figure 1 The illustration shows a perspective view of an example wind turbine 160. As shown, the wind turbine 160 includes a wind turbine tower 170 extending from a support surface 150, a nacelle 161 mounted on the wind turbine tower 170, and a rotor 115 coupled to the nacelle 161. The rotor 115 includes a rotatable hub 110 and at least one wind turbine blade 120 coupled to and extending outward from the hub 110. For example, in the illustrated embodiment, the rotor 115 includes three wind turbine blades 120. However, in alternative embodiments, the rotor 115 may include more or fewer than three wind turbine blades 120. Each wind turbine blade 120 may be spaced apart around the hub 110 to allow rotation of the rotor 115 so that kinetic energy can be converted from wind energy into usable mechanical energy, and subsequently into electrical energy. For example, the hub 110 may be rotatably coupled to a generator 162 positioned within the nacelle 161. Figure 2 This allows for the generation of electrical energy.

[0028] The wind turbine 160 may be exposed to harsh conditions in onshore and offshore applications. In particular, vortex-induced oscillations and ocean wave loading are critical load conditions for the wind turbine 160 and / or the wind turbine tower 170. These load conditions (e.g., vortices in the upper portion of the wind turbine tower) can cause lateral oscillations of the wind turbine 160, which can lead to critical bending loads on the wind turbine tower.

[0029] Figure 2 Illustration Figure 1A simplified internal view of an example of the nacelle 161 of a wind turbine 160. As shown, a generator 162 may be disposed within the nacelle 161. Generally, the generator 162 may be coupled to the rotor 115 of the wind turbine 160 to generate electrical power from the rotational energy generated by the rotor 115. For example, the rotor 115 may include a main rotor shaft 163 coupled to a hub 110 to rotate therewith. The generator 162 may then be coupled to the rotor shaft 163 such that rotation of the rotor shaft 163 drives the generator 162. For example, in the illustrated embodiment, the generator 162 includes a generator shaft 166 rotatably coupled to the rotor shaft 163 via a gearbox 164.

[0030] It should be recognized that the rotor shaft 163, gearbox 164 and generator 162 can be largely supported within the nacelle 161 by a support frame or base plate 165 positioned on top of the wind turbine tower 170.

[0031] The wind turbine blade 120 (and particularly the root portion of the blade) is connected to the hub 110 via a pitch bearing 100 between the blade 120 and the hub 110. The pitch bearing 100 includes an inner ring and an outer ring. The wind turbine blade (particularly its root portion) may be attached to either the inner or outer bearing ring, while the hub is connected to the other bearing ring. When the pitch system 107 is actuated, the wind turbine blade 120 can rotate relative to the hub 110. Therefore, the inner bearing ring can rotate relative to the outer bearing ring. Figure 2 The pitch system 107 includes a pinion 108 that meshes with a ring gear 109 disposed on an inner bearing ring to initiate rotation of the wind turbine blades about the pitch axis. Wind forces acting on the nacelle 161, and particularly on the wind turbine blades, can lead to further induction of oscillations.

[0032] Figure 3 The illustration shows an example of a damping system 10 used to counteract oscillations in a structure. The structure may be a tower structure 32 of a wind turbine tower 170, for example... Figure 6A to Figure 6B As shown in the image.

[0033] Figure 3 The damping system 10 illustrated includes a pendulum device 12 and a container 14. The container 14 contains a viscous medium 16, particularly a viscous fluid. The filling level of the container can be adapted to a desired damping level. This can be done manually or automatically, depending on the required or desired damping level. In this example, the pendulum device 12 also includes a mass 18, which includes a porous structure 22. The porous structure 22 is configured to allow the viscous medium 16 to pass through it. As shown, the porous structure 22 of the pendulum device 12 is at least partially immersed in the viscous medium 16. In different examples, the mass 18 may be completely immersed in the viscous medium 16, for example, by deepening the filling level of the container 14.

[0034] The damping system 10 described herein can be considered as a tuned mass damper.

[0035] exist Figure 3 In the example illustrated, mass 18 may include pendulum mass 20, wherein a porous structure 22 may be attached to pendulum mass 20. The porous structure 22 may include a porous baffle 22. Figure 3 In the example, the porous baffle 22 can be formed as a downwardly extending skirt of the mass 20. One aspect of a downwardly extending skirt is that the baffle may be more efficient. The lowest part of the mass with the baffle is the part of the pendulum that experiences the greatest displacement during oscillation. Therefore, the baffle is more efficient when interacting with a viscous medium along its path. Another aspect of a downwardly extending skirt or any baffle arranged below the mass is that a less viscous medium is required in the container for the baffle to interact with the medium.

[0036] However, in some examples, the pendulum mass 20 and the porous structure 22 can be integrally formed. In other words, the porous structure 22 can form the pendulum mass 20 (see...). Figure 4A ).

[0037] Suitable materials for the pendulum mass 20 and / or porous structure 22 may be metallic materials such as steel and other alloys and / or polymers such as elastomers, thermoplastics and / or thermosetting plastics, ceramic-based materials and / or concrete.

[0038] The porous structure 22 may include channel structures. These channel structures may be at least partially disposed within the mass body 18 of the pendulum device 12, particularly within the pendulum mass body 18. The channel structures may define flow paths for the viscous medium 16. Each flow path may include an inlet opening and an outlet opening. It should be understood that the terms "inlet opening" and "outlet opening" are defined by the direction of flow of the viscous medium through the channel structure, and not by the structure itself. As it travels along the flow path, the viscous medium 16 may deflect between the inlet opening and the outlet opening. The degree of deflection of the viscous medium 16 may be adapted to achieve specific damping characteristics of the damping system 10.

[0039] Furthermore, porous structures such as the porous baffle 22 may include through holes having diameters ranging from 3 mm to 50 mm. The diameter range may also be set from 5 mm to 30 mm. Within a given range, through holes may have the same diameter, or several through holes with different diameters may exist. The term "diameter" should be understood not to limit the hole to a circular cross-section. Rather, the term "diameter" defines the largest circle that can be inscribed within the corresponding hole. The hole may have any cross-section, such as a circular cross-section, a square cross-section, a polygonal cross-section, an elliptical cross-section, and / or the like.

[0040] The viscous medium 16 may be selected from the group consisting of oils (e.g., mineral oil, silicone oil) and / or water-based fluids. Measured at 25°C, the viscosity of the viscous medium 16 may be from 0.1 to 10 Pa·s.

[0041] It should be understood that both the size of the orifice and the viscosity of the viscous medium affect the damping characteristics. Therefore, the size of the orifices in the porous structure 22 (e.g., the diameter of the channels in the channel structure or the diameter of the through-holes) can be selected based on the viscosity of the viscous medium 16, or vice versa. Furthermore, the orifices, or combinations of orifices and viscous media, can be selected such that the viscous medium can pass through the orifices during oscillation, and particularly when the viscous medium passes through the orifices, vortices or turbulence are generated within the viscous medium.

[0042] Additionally, the operating temperature of the structure (and especially the oscillation damping system) should be considered. If the temperature is relatively low, the viscosity of the viscous liquid may increase.

[0043] In addition, the porosity of the porous structure (i.e., the percentage of the open surface of the porous structure) can vary.

[0044] In addition, such as Figure 3 As illustrated, the pendulum device 12 can be suspended from a suspension system 28. The suspension system 28 may include at least one line and / or rod 30, wherein the at least one line and / or rod 30 can be attached to the mass 18 at a corresponding suspension point 31. The suspension system 28 can be considered as part of the mass 18. The suspension system 28 can be attached to at least one inner surface of the container 14, such as... Figure 3 As shown in the diagram. Figure 4A This schematically illustrates another example of a damping system used to counteract oscillations in a building. In this damping system, a pendulum mass 20 and a porous structure are integrally formed.

[0045] Figure 4B Another example of a damping system for counteracting oscillations in a building is schematically illustrated. Here, the mass 18 of the pendulum system is substantially annular. It should be noted that the ring formed by the mass 18, which includes the pendulum mass 20 and the porous structure 22, can be a closed loop (i.e., circular) or an open loop, and can include separate ring portions. The shape of the container 14 is adapted to the shape of the mass 18. Therefore, the container is also substantially annular. Figure 4B The damping system provides free installation space within the ring structure. Therefore, supply lines, stairs, and / or elevators can be guided through the damping system.

[0046] like Figure 4B As further illustrated, the suspension system 28 may optionally be attached to the interior surface of a structure such as a wind turbine tower 170.

[0047] Figure 5AThe illustration shows another example of a damping system 10 used to counteract oscillations in a building. As shown, the damping system 10 may also include at least one elastic element 26. The at least one elastic element 26 may be attached to the inner surface (not shown) of the mass 18 (as shown) and / or the container 14. The at least one elastic element 26 may be configured to limit the maximum displacement of the mass 18 of the pendulum device 12. The elastic element 26 may be formed as an elastic block. Furthermore, the elastic element 26 may be configured as an elastic strip, thread, spring, rope, line, and / or cable connected to the pendulum device 12 and the container 14 to limit the maximum displacement of the mass 18 of the pendulum device 12. Figure 5A As illustrated, another possible example of such an elastic element 26 is an elastic stop attached to the inner surface of the mass 18 and / or the container 14. Furthermore, multiple elastic elements 26 (e.g., the elastic stop) may be mounted around the circumference of the mass 18 and / or the container 14, forming a ring or a series of individual elastic elements 26. Suitable materials for the elastic element 26 may be soft metals and / or polymers, such as elastomers, thermoplastics, and / or thermosetting plastics. The elastic stop may have the function of damping the impact from a pendulum at the container and also dissipating the energy of the oscillation.

[0048] In other examples, the damping system 10 may also include friction plates (not shown) adapted to dampen oscillations of the mass 18. The damping mechanism described below may rely on relative motion between at least two friction plates that are at least partially in contact. The at least two friction plates may optionally be attached to the container 14, the mass 18, and / or the suspension system 28. The material pairing of the at least two friction plates may be metallic and / or polymeric.

[0049] Figure 5B and Figure 5C Another example of a damping system 10 for counteracting oscillations in a building is illustrated. Figure 5B and Figure 5C As illustrated, the porous structure 22 may include at least one porous baffle 24. When viewed from the neutral position of the pendulum mass 20, the at least one porous baffle 24 may be attached to the pendulum mass 20 from below, above, and / or laterally. The neutral position of the pendulum mass 20 corresponds to the non-deflection state of the pendulum device 12.

[0050] At least one porous baffle 24 may be cylindrical, such as Figure 5B and Figure 5C Further illustrated in the diagram. Additionally, at least one cylindrical porous baffle 24 may at least partially surround the pendulum mass 20.

[0051] like Figure 5CAs illustrated, the porous structure 22 may include a plurality of porous baffles 24 arranged concentrically. The multiple porous baffles may be arranged such that the baffles are both vertically and horizontally offset between them. In another example, the porous baffles 24 may be arranged in a cross, star-shaped, and / or circular pattern. Suitable materials for the porous baffles 24 may be metallic materials such as steel and other alloys and / or polymers such as elastomers, thermoplastics, and / or thermosetting plastics.

[0052] Various features of different examples of damping systems can be combined, that is, different mass body shapes can be combined with different baffle shapes and constructions, and different baffle shapes and constructions can be combined with different elastic elements.

[0053] Figure 6A to Figure 6B Two examples of wind turbine tower 170 are schematically illustrated, including tower structure 32 and one of the damping systems 10 described herein. As shown, damping system 10 can be attached to tower structure 32. Damping system 10 can be attached inside tower structure 32 (see [reference]). Figure 6A ) or external (see Figure 6B At this location. In other examples, more than one of the damping systems 10 can be attached to the tower structure 32. In the case of multiple damping systems, these systems can be arranged at different heights along the tower. Figure 6A As further illustrated, the damping system 10 can be installed even before the nacelle 161 is installed.

[0054] like Figure 6A and Figure 6B As shown in the example, the damping system can be arranged specifically along the upper half, and more specifically along the upper third of the tower's height.

[0055] In any of the examples disclosed herein, the porosity of the baffle (i.e., the percentage of the baffle's surface area occupied by the holes to the total surface area of ​​the baffle) can be between 25% and 65%, and specifically between 30% and 50%. The size of the baffle can be determined specifically according to the size of the pendulum's mass. In some examples, the area of ​​the baffle (excluding the holes) can be between 10% and 30% of the surface area of ​​the side surfaces of the mass.

[0056] In any of the examples disclosed herein, the level of the viscous fluid in the container allows only a portion of the mass to remain suspended in the fluid. In particular, less than 50% of the height of the mass with the baffle may be suspended in the fluid.

[0057] Figure 7The illustration shows a flowchart of an example of a method 2000 for counteracting oscillations in a building. A method 2000 for counteracting oscillations in a building is provided. The method includes providing a mass body at box 2100, wherein the mass body comprises a porous structure. The mass body may be constructed according to any of the examples disclosed herein.

[0058] Figure 7 Method 2000 further includes providing a container with a viscous fluid in frame 2200, and installing the container with the viscous fluid inside the building in frame 2300. The method also includes suspending a mass in frame 2400 such that the porous structure of the mass is at least partially immersed in the viscous fluid.

[0059] Installations in containers, viscous fluids, and structures may be based on any of the examples disclosed herein.

[0060] The methods disclosed herein can be implemented as part of the installation of a structure (e.g., a wind turbine tower). That is, the methods described herein can be implemented during the installation or commissioning of a wind turbine before operation begins. In other examples, such methods can be implemented as part of a retrofit procedure. A wind turbine may be in continuous operation and may be found to experience oscillations larger than expected. A tuned mass damper, according to any of the examples described herein, can then be installed in the wind turbine. In still other examples, the wind turbine (or other structure) may already include a tuned mass damper. The method involves adding a container with a viscous fluid and adding a porous element, such as a baffle, to the mass body such that the porous element of the mass body is partially immersed in the viscous fluid.

[0061] Thus, the suspension system 28 and / or container 14 can be attached to the interior or exterior of the building. Furthermore, fixation can be achieved by any suitable attachment or fastener, including, for example, form-fit connectors or material connections. Additionally, method 2000 may include setting the mass 18 in a movable state within frame 2500, in which the mass 18 is allowed to move and thus dampens oscillations. The opposite state to the movable state can be considered a blocked state. During transport and when attaching the damping system 10 to the building, a configuration of the pendulum device 12 in a blocked state can be used, in which the mass 18 cannot move and does not dampen oscillations.

[0062] Based on the various examples disclosed herein, a tuned mass damper for counteracting oscillations in a building is provided. The tuned mass damper includes a suspended mass body configured to interact with a viscous fluid through a porous structure, such that when the suspended mass body oscillates, the porous structure of the suspended mass body generates turbulence in the viscous fluid.

[0063] In the examples, the suspended mass may include a porous baffle arranged within a viscous fluid. In some examples, the viscous liquid may be provided in a container within the wind turbine tower.

[0064] This document also illustrates a tower, particularly a wind turbine tower 170 including tower structure 32. The tower includes one or more tuned mass dampers comprising a suspended mass with a porous structure configured to interact with a viscous fluid such that the suspended mass generates turbulence in the viscous fluid when it oscillates.

[0065] This written description uses examples to disclose the invention, including preferred embodiments, and also enables any person skilled in the art to practice the invention, including making and using any device or system and performing any combined methods. The patentability of the invention is defined by the claims and may include other examples that would occur to a person skilled in the art. Such other examples are intended to fall within the scope of the claims if they have fastening elements that are not indistinguishable from the literal language of the claims, or if they include equivalent fastening elements that have minor differences from the literal language of the claims. Those skilled in the art may mix and match aspects of the various embodiments described, as well as other known equivalents of each such aspect, to construct additional embodiments and techniques in accordance with the principles of this application. If reference numerals relating to the drawings are enclosed in parentheses in the claims, they are merely intended to increase the comprehensibility of the claims and should not be construed as limiting the scope of the claims.

[0066] Technical Solution 1. A damping system for counteracting oscillations in a building, the damping system comprising:

[0067] Pendulum mechanism; and

[0068] A container that contains a viscous medium;

[0069] The pendulum device includes a mass body with a porous structure configured to allow the viscous medium to pass through it.

[0070] The porous structure is at least partially immersed in the viscous medium.

[0071] Technical Solution 2. The damping system according to Technical Solution 1, wherein the mass body includes a pendulum mass body, and wherein the porous structure is attached to the pendulum mass body.

[0072] Technical Solution 3. The damping system according to Technical Solution 2, wherein the porous structure includes at least one porous baffle.

[0073] Technical Solution 4. The damping system according to Technical Solution 3, wherein, when viewed from the neutral position of the pendulum mass, the at least one porous baffle is attached to the pendulum mass from below, above and / or laterally.

[0074] Technical Solution 5. The damping system according to Technical Solution 3, wherein the at least one porous baffle is cylindrical.

[0075] Technical Solution 6. The damping system according to Technical Solution 5, wherein the at least one cylindrical porous baffle at least partially surrounds the pendulum mass of the pendulum device.

[0076] Technical Solution 7. The damping system according to Technical Solution 3, wherein the porous structure includes a plurality of porous baffles, and optionally wherein the porous baffles are arranged in a cross, star-shaped and / or circular pattern.

[0077] Technical Solution 8. The damping system according to any one of Technical Solutions 1 to 7 further includes at least one elastic element, said at least one elastic element being configured to limit the maximum displacement of the mass body of the pendulum device.

[0078] Technical Solution 9. The damping system according to any one of technical solutions 1 to 8, wherein the porous structure includes a through hole having a diameter ranging from 3 mm to 50 mm, specifically from 5 mm to 30 mm.

[0079] Technical Solution 10. The damping system according to any one of technical solutions 1 to 9, wherein the viscous medium is selected from the group consisting of oil and / or water-based fluids.

[0080] Technical Solution 11. The damping system according to any one of Technical Solutions 1 to 10, wherein, when measured at a temperature of 25°C, the viscosity of the viscous medium is in the range of 0.1 to 10 Pa·s.

[0081] Technical Solution 12. The damping system according to any one of technical solutions 1 to 11 further includes a friction plate, wherein the friction plate is adapted to reduce the pendulum motion of the mass body.

[0082] Technical Solution 13. A wind turbine including a wind turbine tower, wherein the wind turbine tower includes a damping system according to any one of Technical Solutions 1 to 12, wherein the container is installed in the upper half of the height of the wind turbine tower.

[0083] Technical Solution 14. A method for counteracting oscillations in a building, wherein the method comprises:

[0084] Provide containers for viscous fluids;

[0085] The container containing the viscous fluid is installed inside the structure; and

[0086] A suspended mass, wherein the mass includes a porous structure such that the porous structure of the mass is at least partially immersed in the viscous fluid.

[0087] Technical Solution 15. The method for counteracting oscillations in a structure according to Technical Solution 14, wherein the structure is a wind turbine tower.

[0088] List of reference numerals in the attached diagram:

[0089] 10 Damping System

[0090] 12. Pendulum mechanism

[0091] 14 Containers

[0092] 16 Viscous media

[0093] 18 Masses

[0094] 20 Pendulum Mass

[0095] 22 Porous Structure

[0096] 24. Perforated baffle

[0097] 26. Elastic elements

[0098] 28 Suspension System

[0099] 30 lines or poles

[0100] 31 Suspension Points

[0101] 32 Tower Structure

[0102] 100 pitch bearing

[0103] 107 Pitch System

[0104] 108 small gears

[0105] 109 Ring Gear

[0106] 110 Wind turbine hub

[0107] 115 Rotor

[0108] 120 Wind turbine blades (blades)

[0109] 150 Support Surface

[0110] 160 wind turbine

[0111] Cabin 161

[0112] 162 Generator

[0113] 163 Rotor Shaft

[0114] 164 gearbox

[0115] 165 Supporting Frame

[0116] 166 Generator Shaft

[0117] 170 Wind turbine tower (tower)

[0118] 2000 Methods for Counteracting Oscillations

[0119] 2100 provides a mass body with a porous structure.

[0120] 2200 provides containers for viscous fluids.

[0121] 2300 Installation Container

[0122] 2400 suspended mass

[0123] 2500 Set the mass to a movable state.

Claims

1. A damping system (10) for counteracting oscillations in a wind turbine tower, the damping system (10) comprising: Pendulum device (12); and Container (14) containing a viscous medium (16); The pendulum device (12) includes a mass body (18) comprising a porous structure (22) configured to allow the viscous medium (16) to pass through it. The porous structure (22) is at least partially immersed in the viscous medium (16). The mass body (18) includes a pendulum mass body (20), and the porous structure (22) is attached to the pendulum mass body (20). The porous structure (22) includes at least one porous baffle (24), which is formed as a downwardly extending skirt of the pendulum mass (20). The container (14) is installed in the upper half of the height of the wind turbine tower.

2. The damping system (10) according to claim 1, wherein, When viewed from the neutral position of the pendulum mass (20), the at least one porous baffle (24) is attached below, above and / or laterally relative to the pendulum mass (20).

3. The damping system (10) according to any one of claims 1 to 2, wherein, The at least one porous baffle (24) is cylindrical.

4. The damping system (10) according to claim 3, wherein, The at least one porous baffle (24) in the column shape at least partially surrounds the pendulum mass (20) of the pendulum device (12).

5. The damping system (10) according to claim 1 or 2, wherein, The porous structure (22) includes multiple porous baffles (24).

6. The damping system (10) according to claim 5, wherein, The porous baffles (24) are arranged in intersecting, star-shaped and / or circular patterns.

7. The damping system (10) according to claim 1 or 2 further includes at least one elastic element (26) configured to limit the maximum displacement of the mass body (18) of the pendulum device (12).

8. The damping system (10) according to claim 1 or 2, wherein, The porous structure (22) includes through holes with diameters ranging from 3 mm to 50 mm.

9. The damping system (10) according to claim 8, wherein, The porous structure (22) includes through holes with diameters ranging from 5 mm to 30 mm.

10. The damping system (10) according to claim 1 or 2, wherein, The viscous medium (16) is selected from the group consisting of oil and / or water-based fluids.

11. The damping system (10) according to claim 1 or 2, wherein, The viscosity of the viscous medium (16) measured at 25°C is in the range of 0.1 to 10 Pa·s.

12. The damping system (10) according to claim 1 or 2 further includes a friction plate, wherein, The friction plate is adapted to reduce the pendulum motion of the mass (18).

13. A method for counteracting oscillations in a wind turbine tower, wherein, The method includes: Provide containers for viscous fluids; The container containing the viscous fluid is installed in the upper half of the height of the wind turbine tower; and A suspended mass, wherein the mass includes a porous structure such that the porous structure of the mass is at least partially immersed in the viscous fluid, wherein the mass includes a pendulum mass, wherein the porous structure is attached to the pendulum mass, and wherein the porous structure includes at least one porous baffle formed as a downwardly extending skirt of the pendulum mass (20).

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