Intelligent variable damping inertance vibration reduction system for offshore wind power

Abstract

The application relates to an intelligent variable-damping inertance damping system for offshore wind power, which comprises a wind turbine tower, a plurality of variable-damping rods, a mass block, universal rollers, a data acquisition and control module, sensors and a limiting platform; the limiting platform is fixedly arranged in the wind turbine tower, the mass block is arranged on the limiting platform, the two ends of the variable-damping rod are connected to the inner wall of the wind turbine tower and the outer wall of the mass block respectively, the variable-damping rod comprises a viscous damping chamber 21, a flow rate control chamber 25 and an inertance chamber 28; the sensors are arranged on the inner wall of the wind turbine tower and used for monitoring the vibration condition of the wind turbine tower; the data acquisition and control module is used for collecting the data of the sensors and controlling the magnetic field intensity of the electromagnet in the flow rate control chamber of the variable-damping rod, so as to adjust the rotating speed of the variable-speed water wheel, adjust the liquid flow rate and realize intelligent damping regulation and control.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction device technology, and in particular to an intelligent variable damping inertial capacitance vibration reduction system for offshore wind power. Background Technology

[0002] Wind energy, as a clean, pollution-free, renewable, widely distributed, and abundant energy source, is attracting increasing attention and importance. Offshore wind power, with its advantages of low wind shear, high wind speed, low noise pollution, large reserves, and no occupation of onshore arable land, will become a key focus of future wind power development research. As a slender and tall structure, the wind turbine tower is prone to vibration under wind loads. Fatigue can occur at tower connections and on certain nacelle components under vibration, reducing tower safety and shortening its service life. Furthermore, excessive tower vibration can lead to overall turbine instability, increasing the risk of overturning or collapse, posing a threat to maintenance and operation personnel, as well as surrounding offshore facilities and vessels. With increasing tower height and longer, more flexible turbine blades, vibration problems are becoming increasingly prominent. These vibrations directly threaten the safe and stable operation of wind turbines and significantly increase the operation and maintenance costs of offshore wind farms. Therefore, reducing vibration damage to wind turbine units to ensure their normal operation has become an important research direction.

[0003] Currently, the common vibration reduction devices used in offshore wind turbines are relatively simple and mostly passively controlled, and the damping coefficient of the dampers is not adjustable. In the complex marine environment, they cannot adequately meet the vibration reduction requirements. In addition, it is more effective to place the vibration reduction device in the upper part of the wind turbine tower, but due to the limited internal space of the wind turbine tower, it is impossible to place a large-volume TMD vibration reduction device in the narrow space in the upper part of the wind turbine tower.

[0004] Therefore, there is an urgent need to provide an intelligent variable damping inertial capacitance vibration reduction system for offshore wind power, which can solve the problems of traditional vibration reduction systems being huge, having a single control direction, and being unable to intelligently adjust the damping coefficient, thereby improving the adaptability of wind turbine vibration reduction systems to complex environments. Summary of the Invention

[0005] Based on this, the present invention provides an intelligent variable damping inertial capacitance vibration reduction system for offshore wind power, which focuses on solving the problems of traditional vibration reduction systems being huge in size, having a single control direction, and being unable to intelligently adjust the damping coefficient.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A smart variable damping inertial volume vibration reduction system for offshore wind power includes: a wind turbine tower, several variable damping rods, a mass block, omnidirectional rollers, a data acquisition and control module, sensors, and a limiting platform. The limiting platform is fixedly installed inside the wind turbine tower, and the mass block is placed on the limiting platform. The two ends of the variable damping rods are respectively connected to the inner wall of the wind turbine tower and the outer wall of the mass block. Sensors are installed on the inner wall of the wind turbine tower to monitor the vibration of the wind turbine tower. The data acquisition and control module is used to collect data from the sensors and control the variable damping rods. The variable damping rod includes a sleeve and a piston installed inside the sleeve. The sleeve contains a viscous damping chamber, a flow rate control chamber, and an inertial volume chamber. The viscous damping chamber is filled with a viscous liquid. The piston includes a piston head and a piston rod. The piston head is installed inside the viscous damping chamber to displace the viscous liquid. The viscous damping chamber is divided into a first chamber and a second chamber, and can slide back and forth in the viscous damping chamber. One end of the piston rod is connected to the piston head, and the other end extends from the end of the viscous damping chamber away from the flow rate control chamber to connect with the inner wall of the wind turbine tower. A return spring is sleeved on the piston rod located outside the viscous damping chamber. The first chamber of the viscous damping chamber is connected to the flow rate control chamber through a pipe. A variable speed water turbine and an electromagnet are installed inside the flow rate control chamber. The flow rate control chamber is connected to one end of the inertial volume chamber through a pipe, and the other end of the inertial volume chamber is connected to the second chamber of the viscous damping chamber through a pipe. The data acquisition and control module controls the magnetic field strength of the electromagnet in the variable damping rod according to the data acquired by the sensor to adjust the speed of the variable speed water turbine, thereby regulating the flow rate of the liquid in the flow rate control chamber and realizing intelligent damping control.

[0007] Furthermore, the inertial volume chamber is positioned between the viscous damping chamber and the sleeve wall, and is spirally arranged around the viscous damping chamber.

[0008] Furthermore, the electromagnets are arranged parallel to the variable speed turbine on the wall of the flow control chamber, the surface of the variable speed turbine is provided with an anti-corrosion layer, and the sleeve of the variable damping rod is filled with damping material.

[0009] Furthermore, limit rings are provided at both ends of the viscous damping chamber to prevent rigid collisions between the piston and the viscous damping chamber.

[0010] Furthermore, the data processing and control module is placed inside a steel frame, which is welded to the wind turbine tower, and a buffer material protective layer is installed inside the steel frame.

[0011] Furthermore, the mass block is cube-shaped, and its weight is 0.5%-1% of the total weight of the fan. Universal casters are installed at the bottom of the mass block so that it can slide freely 360° on the limiting platform.

[0012] Furthermore, it also includes spherical hinges, with the two ends of the variable damping rod connected to the inner wall of the wind turbine tower and the outer wall of the mass block respectively via spherical hinges. The spherical hinges are welded to the inner wall of the wind turbine tower and to the mass block.

[0013] Furthermore, there are four variable damping rods, arranged around the mass block at 90° intervals, with the center of the upper surface of the mass block as the center.

[0014] Furthermore, the limiting platform is also equipped with an annular limiting layer with a reserved ladder passage. The annular limiting layer is used to limit the movement area of ​​the mass block and ensure the safety of the ladder passage. The annular limiting layer is made of elastic anti-collision material to prevent the mass block from rigidly colliding with external structures such as the tower.

[0015] Furthermore, a support truss is provided at the bottom of the limiting platform. The support truss is arranged sequentially at 45° intervals along the inner wall of the tower with the center of the bottom surface of the limiting platform as the center. The support truss is welded to the tower and the limiting platform.

[0016] Compared with the prior art, the present invention has the following advantages and technical effects: First, the vibration reduction system provided by this invention can realize intelligent control of system damping. Vibration data from sensors on the wind turbine tower are input to the data acquisition and control module for precise real-time vibration analysis. The system will adjust the magnetic field strength in the variable damping rod in combination with the real-time vibration, thereby adjusting the speed of the variable speed turbine and controlling the flow rate of the liquid in the chamber, thus realizing intelligent damping control.

[0017] Secondly, the vibration reduction system provided in this application can achieve better vibration reduction effect through inertial capacitance enhancement. The inertial capacitance chamber inside the variable damping rod will provide additional inertial force during operation. Only a small mass block is needed to achieve a good vibration reduction effect, which is suitable for vibration reduction of structures with narrow internal spaces.

[0018] Third, the vibration reduction system provided in this application can achieve vibration control in all horizontal directions. The mass block can slide freely in 360° on the limiting platform. The mass block, variable damping rod and wind turbine tower are all connected by spherical hinges. Each component can rotate freely to facilitate vibration control in all horizontal directions. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the vibration reduction system of the present invention; Figure 2 This is a top view of the overall structure of the vibration reduction system of the present invention; Figure 3 This is a front sectional view of the overall structure of the vibration reduction system of the present invention; Figure 4 This is a three-dimensional schematic diagram of the variable damping rod of the present invention; Figure 5 This is a vertical cross-sectional view of the variable damping rod of the present invention; Figure 6 This is a horizontal cross-sectional view of the variable damping rod of the present invention.

[0021] Figure reference numerals: 1. Wind turbine tower; 2. Variable damping rod; 3. Spherical hinge; 4. Mass block; 5. Universal roller; 6. Data processing and control module; 7. Sensor; 8. Limiting platform; 21. Viscous damping chamber; 22. Piston; 23. Main shaft; 24. Limiting ring layer; 25. Flow rate control chamber; 26. Variable speed turbine; 27. Electromagnet; 28. Inertial volume chamber; 29. ​​Return spring; 210. Damping rod shell; 81. Ladder passage; 82. Annular limiting layer; 83. Support truss. Detailed Implementation

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0025] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0026] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0027] Furthermore, the descriptions of orientations in this specification, such as up, down, left, right, front, back, inside, outside, longitudinal, transverse, vertical, and horizontal, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the purpose of facilitating the description of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0028] Figure 1 This is a schematic diagram of the overall structure of the intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to the present invention. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to the present invention includes: a wind turbine tower 1, a variable damping rod 2, a mass block 4, omnidirectional rollers 5, a data acquisition and control module 6, a sensor 7, and a limiting platform 8. The limiting platform 8 is fixedly installed inside the wind turbine tower 1, and the mass block 4 is placed on the limiting platform 8. The two ends of the variable damping rod 2 are respectively connected to the inner wall of the wind turbine tower 1 and the outer wall of the mass block 4. The sensor 7 is installed on the inner wall of the wind turbine tower 1 to monitor the vibration of the wind turbine tower 1. The data acquisition and control module 6 is used to collect data from the sensor 7 and control the variable damping rod 2.

[0029] Preferably, the mass block 4 is cubic in shape, and the bottom of the mass block 4 is equipped with universal rollers 5 so that the mass block 4 can slide freely 360° on the limiting platform 8. The wind turbine tower 1 is made of welded steel plates and is a cylindrical support and protection structure.

[0030] like Figure 1-2 As shown, the intelligent variable damping inertial capacitance vibration reduction system for offshore wind power of the present invention also includes a spherical hinge 3; the two ends of the variable damping rod 2 are respectively connected to the inner wall of the wind turbine tower 1 and the outer wall of the mass block 4 through the spherical hinge 3, so that the components can rotate freely; the spherical hinge 3 is welded to the inner wall of the wind turbine tower 1, and the spherical hinge 3 and the mass block 4 can be welded or connected in other ways.

[0031] Preferably, the variable damping rods 2 are arranged around the mass block 4 at 90° intervals, with the center of the upper surface of the mass block 4 as the center, that is, there are a total of 4 variable damping rods 2.

[0032] Preferably, the weight of mass block 4 is 0.5%-1% of the total weight of the fan, at which point the control effect is optimal.

[0033] Figure 4-6 The invention illustrates a variable damping rod 2 for an intelligent variable damping inertial-capacitance vibration reduction system for offshore wind power. The variable damping rod 2 includes a sleeve 210 and a piston disposed within the sleeve 210. The sleeve contains a viscous damping chamber 21, a flow rate control chamber 25, and an inertial-capacitance chamber 28. The viscous damping chamber 21 is filled with a viscous liquid.

[0034] The piston includes a piston head 22 and a piston rod 23. The piston head 22 is disposed within the viscous damping chamber 21, dividing the viscous damping chamber 21 into a first chamber and a second chamber, and can slide back and forth within the viscous damping chamber 21. One end of the piston rod 23 is connected to the piston head 22, and the other end extends from the end of the viscous damping chamber 21 away from the flow rate control chamber 25 to connect with the inner wall of the wind turbine tower 1. A return spring 29 is sleeved on the piston rod located outside the viscous damping chamber 21 to ensure that the piston can return to its initial state after operation.

[0035] The first chamber of the viscous damping chamber 21 is connected to the flow rate control chamber 25 via a pipe to allow viscous liquid to flow into the flow rate control chamber 25. The flow rate control chamber 25 is equipped with a variable speed water turbine 26 and an electromagnet 27. The flow rate control chamber 25 is connected to one end of the inertial volume chamber 28 via a pipe. The inertial volume chamber 28 is located between the walls of the viscous damping chamber 21 and the sleeve 210, and is spirally arranged around the viscous damping chamber 21 to provide sufficient inertial force for the intelligent variable damping inertial volume vibration reduction system, thereby enhancing the damping and vibration reduction effect. The other end of the inertial volume chamber 28 is connected to the second chamber of the viscous damping chamber 21 via a pipe to allow viscous liquid to flow back to the second chamber of the viscous damping chamber 21.

[0036] Electromagnet 27 is arranged parallel to the variable speed water turbine on the wall of the flow rate control chamber 25. Under the control of the data acquisition and control module 6, it can change the magnetic field strength within the flow rate control chamber 25, thereby regulating the rotational speed of the variable speed water turbine 26. The data acquisition and control module 6 controls the magnetic field strength of the electromagnet 27 in the variable damping rod 2 based on the data acquired from the sensor 7 to adjust the rotational speed of the variable speed water turbine 26, thereby regulating the flow rate of the liquid within the flow rate control chamber 25 and achieving intelligent damping control.

[0037] Limiting rings 24 are provided at both ends of the viscous damping chamber 21 to prevent rigid collisions between the piston 22 and the viscous damping chamber 21.

[0038] The variable speed water turbine 26 is made of a metallic conductor, preferably copper or other inert metal. An anti-corrosion layer is provided on the surface of the variable speed water turbine 26 to prevent corrosion by viscous liquids.

[0039] All pipes within the variable damping rod 2 are welded together to ensure strength. The sleeve 210 of the variable damping rod 2 is filled with damping material to ensure the safe and stable operation of the viscous damping chamber 21, flow rate control chamber 25, and inertial volume chamber 28 within the variable damping rod 2.

[0040] In the above specific embodiments, a preferred improved design is that the data processing and control module 6 is placed inside a steel frame and welded to the wind turbine tower 1, and a buffer material protective layer is set inside the steel frame to ensure stable operation of the device.

[0041] Preferably, the variable damping rod 2 and the spherical hinge 3 are made of high-strength materials to cope with vibration and impact.

[0042] like Figure 2 and 3As shown, the limiting platform 8 is also equipped with an annular limiting layer 82 and a reserved climbing ladder passage 81 to facilitate the passage of staff and the arrangement of cables. The annular limiting layer 82 is used to limit the movement area 1 of the mass block 4 and ensure the safety of the climbing ladder passage 81. The annular limiting layer 82 is made of elastic anti-collision material to prevent the mass block 4 from rigidly colliding with external structures such as the tower 1.

[0043] like Figure 3 As shown, a support truss 83 is further provided at the bottom of the limiting platform 8. The support truss 83 is arranged sequentially at 45° intervals along the inner wall of the tower 1 with the center of the bottom surface of the limiting platform 8 as the center. The support truss 83 is welded to the tower 1 and the limiting platform 8 to ensure that the intelligent variable damping inertial capacitance vibration reduction system is safely and stably fixed inside the tower 1.

[0044] The working principle of the intelligent variable damping inertial capacitance vibration reduction system for offshore wind power of the present invention is as follows: When the wind turbine tower 1 vibrates, the intelligent variable damping inertial volume vibration reduction system starts working. Sensor 7 monitors the real-time vibration signal of the wind turbine tower 1 and transmits it to the data acquisition and control module 6. The mass block 4 slides in the opposite direction to the vibration direction of the wind turbine tower 1 and compresses the variable damping rod 2. The pressure transmitted to the wind turbine tower 1 through the variable damping rod 2 provides restoring force and damping force to the wind turbine tower 1. Specifically, when the variable damping rod 2 is compressed, the piston of the variable damping rod 2 moves to the right relative to the viscous damping chamber 21 in the sleeve 210, thereby applying pressure to the viscous liquid in the first chamber of the viscous damping chamber 21. This pushes the viscous liquid in the first chamber into the flow rate control chamber 25 through the pipe. The viscous fluid flowing into the flow rate control chamber 25 further flows into the inertial volume chamber 28 through the pipe, and finally flows into the second chamber of the viscous damping chamber 21 through the inertial volume chamber 28. The flow of the viscous fluid within the flow control chamber 25 drives the rotation of the variable-speed waterwheel 26 within the chamber. The data acquisition and control module 6 adjusts the current in the electromagnet 27 based on the vibration data collected by the sensor 7, thereby controlling the magnetic field strength within the flow control chamber 25. Since a metal conductor moving in a magnetic field experiences a force, the rotational speed of the variable-speed waterwheel 26 can be adjusted by changing the magnetic field of the electromagnet 27, thus controlling the flow rate of the viscous liquid within the flow control chamber 25 and regulating the damping coefficient of the variable damping rod 2. After the vibration ends, the piston returns to its initial state under the action of the return spring 29, simultaneously restoring the mass block 4 to its initial position.

[0045] When the mass block 4 slides and compresses the variable damping rod 2, the inertial volume chamber 28 in the variable damping rod 2 can amplify the pressure and act on the wind turbine tower 1. When combined with the small volume mass block 4, it can achieve a stronger damping and vibration reduction effect.

[0046] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A smart variable damping inertial capacitance vibration reduction system for offshore wind power, comprising: The wind turbine tower (1), several variable damping rods (2), spherical hinges (3), mass blocks (4), data acquisition and control module (6), sensors (7), and limit platforms (8) are used. The limit platforms (8) are fixedly installed inside the wind turbine tower (1), and the mass blocks (4) are placed on the limit platforms (8). The two ends of the variable damping rods (2) are connected to the inner wall of the wind turbine tower (1) and the outer wall of the mass blocks (4) respectively through spherical hinges (3). The spherical hinges (3) are welded to the inner wall of the wind turbine tower (1), and the spherical hinges (3) are welded to the mass blocks (4). The sensors (7) are installed on the inner wall of the wind turbine tower (1) to monitor the vibration of the wind turbine tower (1). The data acquisition and control module (6) is used to collect data from the sensors (7) and control the variable damping rods (2). Its features are: The variable damping rod (2) includes a sleeve (210) and a piston disposed inside the sleeve (210); the sleeve is provided with a viscous damping chamber (21), a flow rate control chamber (25), and an inertial volume chamber (28); the viscous damping chamber (21) is filled with a viscous liquid; the piston includes a piston head (22) and a piston rod (23), the piston head (22) is disposed inside the viscous damping chamber (21), dividing the viscous damping chamber (21) into a first chamber and a second chamber, and can slide back and forth in the viscous damping chamber (21); one end of the piston rod (23) is connected to the piston head (22), and the other end extends from the end of the viscous damping chamber (21) away from the flow rate control chamber (25) to connect with the inner wall of the wind turbine tower (1); a return spring (29) is sleeved on the piston rod located outside the viscous damping chamber (21); The first chamber of the viscous damping chamber (21) is connected to the flow rate control chamber (25) through a pipe; the flow rate control chamber (25) is equipped with a variable speed water turbine (26) and an electromagnet (27); the flow rate control chamber (25) is connected to one end of the inertial volume chamber (28) through a pipe, and the other end of the inertial volume chamber (28) is connected to the second chamber of the viscous damping chamber (21) through a pipe; The data acquisition and control module (6) controls the magnetic field strength of the electromagnet (27) in the variable damping rod (2) based on the data collected from the sensor (7) to adjust the rotation speed of the variable speed water wheel (26), thereby regulating the flow rate of the liquid in the flow rate control chamber (25) and realizing intelligent damping control.

2. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, The inertial volume chamber (28) is located between the viscous damping chamber (21) and the sleeve (210) and is spirally arranged around the viscous damping chamber (21).

3. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, Electromagnet (27) is arranged parallel to the variable speed water wheel on the wall of the flow control chamber (25). The surface of the variable speed water wheel (26) is provided with an anti-corrosion layer, and the sleeve (210) of the variable damping rod (2) is filled with damping material.

4. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, Limiting rings (24) are provided at both ends of the viscous damping chamber (21) to avoid rigid collision between the piston head (22) and the viscous damping chamber (21).

5. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, The data processing and control module (6) is placed inside a steel frame, which is welded to the wind turbine tower (1). A buffer material protective layer is installed inside the steel frame.

6. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, The mass block (4) is in the shape of a cube. The weight of the mass block (4) is 0.5%-1% of the total weight of the fan. The bottom of the mass block (4) is equipped with universal rollers (5) so that the mass block (4) can slide freely 360° on the limiting platform (8).

7. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, There are 4 variable damping rods (2), which are arranged around the mass block (4) at 90° intervals with the center of the upper surface of the mass block (4) as the center.

8. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, The limiting platform (8) is also equipped with an annular limiting layer (82), and a ladder passage (81) is reserved on the annular limiting layer (82). The annular limiting layer (82) is used to limit the movement area of ​​the mass block (4) and ensure the safety of the ladder passage (81). The annular limiting layer (82) is made of elastic anti-collision material to avoid rigid collision between the mass block (4) and the wind turbine tower (1).

9. The intelligent variable damping inertial capacitance vibration reduction system for offshore wind power according to claim 1, characterized in that, The bottom of the limiting platform (8) is provided with a support truss (83). The support truss (83) is arranged sequentially at 45° intervals along the inner wall of the tower (1) with the center of the bottom surface of the limiting platform (8) as the center. The support truss (83) is welded to the wind turbine tower (1) and the limiting platform (8).

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