Traction type universal eddy current tuned mass damper suitable for wind power tower
By using a traction-type universal eddy current tuned mass damper, the problems of increased mass and durability of traditional dampers are solved by utilizing the inertial capacitance effect and eddy current damping technology. This achieves efficient vibration reduction and environmental compatibility, and reduces maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional tuned mass dampers add extra mass to wind turbine towers, leading to increased load and design complexity. Furthermore, viscous dampers suffer from serious durability issues, affecting vibration reduction performance and maintenance costs.
A traction-type universal eddy current tuned mass damper is adopted. Through the interaction between a copper rotating flywheel and a permanent magnet, mechanical energy is converted into electrical energy and dissipated as heat energy using inertial capacitance effect and eddy current damping technology, achieving efficient vibration reduction without the need for additional mass.
It effectively reduces the physical weight burden of wind turbine towers, improves vibration reduction performance, enhances the environmental compatibility and durability of equipment, and reduces maintenance complexity and cost.
Smart Images
Figure CN224063714U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to vibration reduction devices, specifically to a traction-type universal eddy current tuned mass damper suitable for wind turbine towers. Background Technology
[0002] Tall wind turbines, under the continuous action of external loads such as wind and earthquakes, are prone to dynamic responses. Over time, this not only leads to the accumulation of structural deformation but may also accelerate the fatigue failure process, directly threatening the safe and stable operation and service life of the wind turbines. Therefore, effectively controlling the dynamic response of wind turbines is crucial to ensuring their long-term safe operation.
[0003] Currently, wind turbine towers widely employ traditional tuned mass dampers as vibration reduction devices. These dampers are connected to the top of the main wind turbine tower structure and primarily consist of an additional mass block, springs, and a viscous damper. When the main structure vibrates, the damper utilizes the resonant energy absorption mechanism of the additional mass block to effectively transfer the vibrational energy from the main structure to the additional mass block. Subsequently, the viscous damper dissipates the captured energy as heat or other forms of energy, thereby controlling the dynamic response of the structure and ensuring its stability and safety.
[0004] While traditional tuned mass dampers have shown some effectiveness in mitigating structural vibrations, the added mass not only imposes a heavy vertical load but also directly increases the complexity of wind turbine tower structural design. Specifically, this manifests in requiring thicker structural walls and foundations to withstand greater loads, all of which raise overall construction costs. Furthermore, as viscous dampers age, durability issues such as material aging and gradual weakening of mechanical properties become increasingly prominent. These problems not only diminish the actual effectiveness of the vibration reduction device but also significantly increase the complexity and cost of subsequent maintenance. Utility Model Content
[0005] Purpose of the utility model: The purpose of this utility model is to provide a traction-type universal eddy current tuned mass damper suitable for wind turbine towers that has strong durability, good vibration reduction performance and does not require additional physical mass.
[0006] Technical solution: This utility model provides a traction-type universal eddy current tuned mass damper suitable for wind turbine towers, comprising a mass ball and a connecting frame fixed inside the wind turbine tower. The connecting frame has a square hole, and the mass ball is suspended by ropes and can swing within the square hole. The inner wall of the square hole is provided with four channels, with adjacent channels being perpendicular and opposite channels being parallel. A longitudinal eddy current inertial capacitive damping device is slidably arranged in a pair of parallel channels, and a transverse eddy current inertial capacitive damping device is slidably arranged in another pair of parallel channels.
[0007] A mass ball is connected to two transverse eddy current inertial capacitive damping devices via a transverse traction chain, and to two longitudinal eddy current inertial capacitive damping devices via a longitudinal traction chain. Each eddy current inertial capacitive damping device has a copper rotating flywheel and a permanent magnet. With the help of the traction chain, the horizontal vibration of the mass ball is converted into the rotational motion of the copper rotating flywheel. The copper rotating flywheel cuts the magnetic field lines, converting mechanical energy into electrical energy in the form of eddy currents. The electrical energy is then converted into heat by the resistance effect of the copper rotating flywheel.
[0008] Furthermore, the longitudinal eddy current inertial capacitive damping device has a longitudinal transverse trolley, which slides along the channel using a first roller on it; a first built-in connecting shaft is rotatably arranged inside the longitudinal transverse trolley, and a first copper rotating flywheel and a first gear are fixed on the first built-in connecting shaft, with a longitudinal traction chain meshing with the first gear; a number of first permanent magnets are arranged on the inner wall of the longitudinal transverse trolley, with N poles and S poles arranged alternately.
[0009] Furthermore, the transverse eddy current inertial capacitive damping device has a transverse trolley, which slides along the channel using a second roller on it; a second built-in connecting shaft is rotatably arranged inside the transverse trolley, and a second copper rotating flywheel and a second gear are fixed on the second built-in connecting shaft; a number of second permanent magnets are arranged on the inner wall of the transverse trolley, with N poles and S poles arranged alternately.
[0010] The lateral trolley has a continuous chain through hole in the channel below it; a support plate is fixed to the bottom of the lateral trolley, and the support plate slides in fit with the chain through hole; a second gear is rotatably mounted on the part of the support plate below the chain through hole; a vertical hole is provided on the support plate to connect the inner cavity of the lateral trolley; the lateral traction chain meshes with the second gear on the second internal connecting shaft, and at the same time, the lateral traction chain passes through the vertical hole and meshes with the second gear on the support plate, so that the lateral traction chain and the longitudinal traction chain are staggered vertically.
[0011] Furthermore, the built-in connecting shaft and the groove on the inner wall of the transverse carriage are engaged by rotating metal balls.
[0012] Furthermore, the mass of the first gear and the mass of the first copper rotating flywheel satisfy the condition that the inertia coefficient of the first copper rotating flywheel is 1.5 to 2 times the mass of the ball; the mass of the second gear and the mass of the second copper rotating flywheel satisfy the condition that the inertia coefficient of the second copper rotating flywheel is 1.5 to 2 times the mass of the ball.
[0013] Furthermore, the ratio of the distance between adjacent first permanent magnets to the width of the first permanent magnet itself is maintained at 0.65 to 0.85; the ratio of the distance between adjacent second permanent magnets to the width of the second permanent magnet itself is maintained at 0.65 to 0.85.
[0014] Furthermore, the size of the air gap between the first permanent magnet and the first copper rotating flywheel, and the size of the air gap between the second permanent magnet and the second copper rotating flywheel, satisfy the requirement that the vertical additional damping ratio provided by the corresponding eddy current inertial capacitive damping device is in the range of 0.87% to 7%.
[0015] Furthermore, chain interfaces are provided around the mass ball, and chain bearings are provided in the chain interfaces, with the traction chain connected to the chain bearings.
[0016] Furthermore, the length and stiffness of the rope are such that the ratio of the oscillation frequency of the mass ball to the natural frequency of the wind turbine tower is 0.98 to 1.02.
[0017] Furthermore, the upper end of the rope is hinged to the center of the bottom of the cross support, and the cross support is fixed to the wind turbine tower.
[0018] Beneficial effects: Compared with the prior art, this utility model has the following advantages:
[0019] (1) This utility model utilizes the inertial capacitive mass enhancement effect generated by the rotating copper flywheel in rotational dynamics, which reduces the physical mass while significantly improving the effective dynamic mass of the mass ball; the eddy current damper, as the energy-consuming core, achieves high-efficiency energy consumption compared to the traditional tuned mass damper; at the same time, the eddy current damper also greatly improves the environmental compatibility of the equipment due to its frictionless operation and the fact that it does not require working fluid.
[0020] (2) By suspending the mass ball and connecting it to a sliding transverse and longitudinal eddy current inertial capacitance damping device via a traction chain, the mass ball can swing freely in the horizontal plane, achieving bidirectional damping control and mass amplification, enabling it to efficiently control the vibration response of the wind turbine tower structure, thus having a wider range of applications. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the traction-type universal eddy current tuned mass damper provided in this utility model embodiment and its installation on a wind turbine tower;
[0022] Figure 2 This is a schematic diagram of the structure of the traction-type universal eddy current tuned mass damper with the connecting frame hidden in the embodiment of this utility model.
[0023] Figure 3 This is a schematic diagram of the suspension device in an embodiment of this utility model;
[0024] Figure 4 This is a schematic diagram of the structure of the mass ball in an embodiment of this utility model;
[0025] Figure 5This is a schematic diagram of the connection structure between the mass ball and the traction device in an embodiment of this utility model;
[0026] Figure 6 This is a schematic diagram of the longitudinal eddy current inertial capacitive damping device in an embodiment of this utility model;
[0027] Figure 7 This is a cross-sectional view of the longitudinal eddy current inertial capacitive damping device in an embodiment of this utility model;
[0028] Figure 8 This is a schematic diagram of the transverse eddy current inertial capacitive damping device in an embodiment of this utility model;
[0029] Figure 9 This is an exploded view of the transverse eddy current inertial capacitive damping device in an embodiment of this utility model;
[0030] Figure 10 This is a schematic diagram of the traction device in an embodiment of this utility model;
[0031] Figure 11 This is a schematic diagram of the connecting frame in an embodiment of this utility model;
[0032] Figure 12 This is a schematic diagram of the connection structure between the connecting frame and the eddy current inertial capacitive damping device in an embodiment of this utility model. Detailed Implementation
[0033] The present invention will be further described below with reference to the accompanying drawings.
[0034] Appendix Figures 1 to 12 The accompanying figure labels are as follows:
[0035] 1. Wind turbine towers;
[0036] 2. Suspension device; 2a. Rope; 2b. Mass ball; 2c. Chain joint; 2d. Chain bearing; 2e. Cross support;
[0037] 3. Longitudinal eddy current inertial-capacitive damping device; 3a. First copper rotating flywheel; 3b. First metal ball; 3c. Longitudinal traverse trolley; 3d. First roller; 3e. First permanent magnet; 3f. First built-in connecting shaft; 3g. First gear; 3k. First groove; 3j. Second groove;
[0038] 4. Lateral eddy current inertial-capacitive damping device; 4a. Third groove; 4b. Lateral traverse trolley; 4c. Second built-in connecting shaft; 4d. Second roller; 4e. Second permanent magnet; 4f. Second copper rotating flywheel; 4h. Second gear; 4g. Second metal ball; 4i. Support plate; 4j. Fourth groove; 4k. Vertical hole;
[0039] 5. Traction device; 5a. Lateral traction chain; 5b. Longitudinal traction chain;
[0040] 6, connecting frame; 6a, channel; 6b, chain through hole.
[0041] like Figure 1 and Figure 2 As shown, this utility model embodiment provides a traction-type universal eddy current tuned mass damper suitable for wind turbine towers, including a suspension device 2, a longitudinal eddy current inertial capacitance damping device 3, a transverse eddy current inertial capacitance damping device 4, a traction device 5, and a connecting frame 6. The traction device 5 includes a transverse traction chain 5a and a longitudinal traction chain 5b.
[0042] The connecting frame 6 is welded and fixed inside the wind turbine tower 1. The connecting frame 6 has a square hole running vertically through its center. Figure 11 and Figure 12 The inner wall of the square hole is provided with four channels 6a, with adjacent channels 6a being perpendicular and opposite channels 6a being parallel. A longitudinal eddy current inertial capacitive damping device 3 is slidably arranged in a pair of parallel channels 6a, and a transverse eddy current inertial capacitive damping device 4 is slidably arranged in another pair of parallel channels 6a.
[0043] Combination Figures 3 to 5 as well as Figure 10 The suspension device 2 includes a mass sphere 2b and a cross support 2e. The mass sphere 2b is suspended by a rope 2a and can swing freely within a square hole. The upper end of the rope 2a is hinged to the center of the bottom of the cross support 2e, which is fixed to the wind turbine tower 1. The mass sphere 2b is connected to two transverse eddy current inertial capacitive damping devices 4 via a transverse traction chain 5a, and to two longitudinal eddy current inertial capacitive damping devices 3 via a longitudinal traction chain 5b. To ensure a tight connection between the mass sphere 2b and the traction chain, four chain interfaces 2c are evenly arranged around the mass sphere 2b. A chain bearing 2d is installed in each chain interface 2c, and the traction chain is connected to the chain bearing 2d.
[0044] Combination Figure 6 and Figure 7The longitudinal eddy current inertial capacitance damping device 3 has a longitudinal lateral moving carriage 3c, which slides along the channel 6a using a first roller 3d. A first internal connecting shaft 3f is rotatably mounted inside the longitudinal lateral moving carriage 3c. Specifically, both ends of the first internal connecting shaft 3f are embedded in the second grooves 3j on the inner wall of the longitudinal lateral moving carriage 3c, and are rotatably engaged with the second grooves 3j via first metal balls 3b. A pair of first copper rotating flywheels 3a and a first gear 3g are fixed on the first internal connecting shaft 3f. The longitudinal traction chain 5b meshes with the first gear 3g, which is located between the two first copper rotating flywheels 3a to prevent the traction chain from slipping. Several first permanent magnets 3e are provided on the inner wall of the longitudinal lateral moving carriage 3c, with N and S poles arranged alternately. Specifically, the first permanent magnets 3e are embedded in the first grooves 3k on the inner wall of the longitudinal lateral moving carriage 3c.
[0045] Combination Figure 8 and Figure 9 The transverse eddy current inertial capacitive damping device 4 has a transverse trolley 4b, which slides along the channel 6a using a second roller 4d. A second internal connecting shaft 4c is rotatably mounted inside the transverse trolley 4b. Specifically, both ends of the second internal connecting shaft 4c are embedded in a fourth groove 4j on the inner wall of the transverse trolley 4b, and are rotatably engaged with the fourth groove 4j via second metal balls 4g. A pair of second copper rotating flywheels 4f and a second gear 4h are fixed on the second internal connecting shaft 4c, with the second gear 4h located between the two second copper rotating flywheels 4f. Several second permanent magnets 4e are arranged on the inner wall of the transverse trolley 4b, with N and S poles alternately arranged. Specifically, the second permanent magnets 4e are embedded in a third groove 4a on the inner wall of the transverse trolley 4b.
[0046] Combination Figure 11 and Figure 12 A continuous chain through-hole 6b is provided in the channel 6a below the transverse trolley 4b. A support plate 4i is fixed to the bottom of the transverse trolley 4b, and the support plate 4i slides in engagement with the chain through-hole 6b. A second gear 4h is rotatably mounted on the portion of the support plate 4i below the chain through-hole 6b. A vertical hole 4k is provided on the support plate 4i to communicate with the inner cavity of the transverse trolley 4b. The transverse traction chain 5a meshes with the second gear 4h on the second internal connecting shaft 4c. At the same time, the transverse traction chain 5a passes through the vertical hole 4k and meshes with the second gear 4h on the support plate 4i, so that the transverse traction chain 5a and the longitudinal traction chain 5b are staggered vertically, ensuring that the two traction chains do not interfere with each other during operation.
[0047] In this embodiment, the ratio of the distance between adjacent first permanent magnets 3e to the width of the first permanent magnet 3e itself is 0.75, and the ratio of the distance between adjacent second permanent magnets 4e to the width of the second permanent magnet 4e itself is 0.75. This optimized ratio aims to maximize the interaction of the magnetic fields between the permanent magnets, thereby enhancing the eddy current effect.
[0048] The size of the air gap between the first permanent magnet 3e and the first copper rotating flywheel 3a is such that the vertical additional damping ratio provided by the longitudinal eddy current inertial capacitive damping device 3 is 0.9%; the size of the air gap between the second permanent magnet 4e and the second copper rotating flywheel 4f is such that the vertical additional damping ratio provided by the transverse eddy current inertial capacitive damping device 4 is 0.9%. This effectively enhances the stability and response speed of the system.
[0049] The masses of the first gear 3g and the first copper rotating flywheel 3a satisfy the condition that the inertial coefficient of the first copper rotating flywheel 3a is 1.6 times the mass of the mass sphere 2b; the masses of the second gear 4h and the second copper rotating flywheel 4f satisfy the condition that the inertial coefficient of the second copper rotating flywheel 4f is 1.6 times the mass of the mass sphere 2b. This optimizes the horizontal inertial mass and stored kinetic energy efficiency of the mass sphere 2b.
[0050] The length and stiffness of rope 2a are such that the ratio of the oscillation frequency of mass sphere 2b to the natural frequency of wind turbine tower 1 is 0.98. This achieves overall dynamic optimization of the device.
[0051] In terms of overall device layout, this invention adopts an axisymmetric design to ensure structural stability. The arrangement of adjacent permanent magnets employs an alternating N-pole and S-pole layout strategy. This layout strategy effectively enhances the interaction between magnetic fields, resulting in a more significant performance improvement for the eddy current damper.
[0052] The principle of this utility model is as follows:
[0053] When wind turbine tower 1 vibrates, mass sphere 2b swings with the aid of rope 2a, absorbing the vibrational energy of wind turbine tower 1. Through the coordination of the traction chain and gears, the horizontal vibration of mass sphere 2b is converted into the rotational motion of a copper flywheel, inducing a capacitive inertial effect that significantly amplifies the horizontal inertial mass of mass sphere 2b (far exceeding its actual physical mass) and greatly enhances the system's ability to store kinetic energy. Simultaneously, the copper flywheel, generating the capacitive inertial effect, continuously cuts magnetic field lines in a strong magnetic field, converting mechanical energy into electrical energy in the form of eddy currents. Subsequently, this electrical energy is rapidly converted into heat by the resistance effect of the copper flywheel, effectively dissipating the vibrational energy in the system.
[0054] The core advantage of this invention is that it significantly increases the apparent mass of the mass sphere without requiring additional physical mass; the mass amplification effect of the inertial container alone enhances the vibration reduction effect. By combining the rotational characteristics of the inertial container with eddy current damping technology, the energy dissipation capacity of the damper is improved. Furthermore, the device has a simple structure, high durability, and excellent vibration reduction performance, making it widely applicable and capable of significantly improving the vibration resistance of wind turbine towers under dynamic loads such as wind vibration and earthquakes.
Claims
1. A towed universal eddy current tuned mass damper suitable for a wind turbine tower, characterized in that, The quality ball (2b) and the connecting frame (6) fixed inside the wind power tower (1) are included, the connecting frame (6) has a square hole, the quality ball (2b) is suspended by the rope (2a) and can swing in the square hole, four grooves (6a) are arranged on the inner wall of the square hole, adjacent grooves (6a) are perpendicular, and opposite grooves (6a) are parallel, the longitudinal eddy current inertia damping device (3) is slidably arranged in a pair of parallel grooves (6a), and the transverse eddy current inertia damping device (4) is slidably arranged in another pair of parallel grooves (6a); The quality ball (2b) is connected with two transverse eddy current inertia damping devices (4) through a transverse traction chain (5a) and is connected with two longitudinal eddy current inertia damping devices (3) through a longitudinal traction chain (5b); the eddy current inertia damping device has a copper rotating flywheel and a permanent magnet; by means of the traction chain, the horizontal vibration of the quality ball (2b) is converted into the rotary motion of the copper rotating flywheel, the copper rotating flywheel cuts the magnetic induction lines to convert mechanical energy into electric energy in the form of eddy current, and the electric energy is converted into heat by the resistance effect of the copper rotating flywheel and is released.
2. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 1, characterized in that, The longitudinal eddy current inertia damping device (3) has a longitudinal transverse trolley (3c), the longitudinal transverse trolley (3c) realizes sliding along the groove (6a) by using the first roller (3d) thereon; a first built-in connecting shaft (3f) is rotatably arranged in the longitudinal transverse trolley (3c), the first built-in connecting shaft (3f) is fixed with a first copper rotating flywheel (3a) and a first gear (3g), and the longitudinal traction chain (5b) is engaged with the first gear (3g); a plurality of first permanent magnets (3e) are arranged on the inner wall of the longitudinal transverse trolley (3c), and N poles and S poles are arranged alternately.
3. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 2, characterized in that, The transverse eddy current inertia damping device (4) has a transverse transverse trolley (4b), the transverse transverse trolley (4b) realizes sliding along the groove (6a) by using the second roller (4d) thereon; a second built-in connecting shaft (4c) is rotatably arranged in the transverse transverse trolley (4b), the second built-in connecting shaft (4c) is fixed with a second copper rotating flywheel (4f) and a second gear (4h); a plurality of second permanent magnets (4e) are arranged on the inner wall of the transverse transverse trolley (4b), and N poles and S poles are arranged alternately. A chain through hole (6b) is formed in the groove (6a) below the transverse transverse trolley (4b); a supporting plate (4i) is fixed to the bottom of the transverse transverse trolley (4b), the supporting plate (4i) is in sliding fit with the chain through hole (6b); the second gear (4h) is rotatably arranged on the part of the supporting plate (4i) below the chain through hole (6b); a vertical hole (4k) is formed in the supporting plate (4i) and communicates with the inner cavity of the transverse transverse trolley (4b); the transverse traction chain (5a) is engaged with the second gear (4h) on the second built-in connecting shaft (4c), and at the same time, the transverse traction chain (5a) passes through the vertical hole (4k) and is engaged with the second gear (4h) on the supporting plate (4i), so that the transverse traction chain (5a) and the longitudinal traction chain (5b) are staggered up and down.
4. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 3, characterized in that, The built-in connecting shaft and the groove on the inner wall of the transverse trolley are in rotating fit through metal balls.
5. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 3, characterized in that, The mass of the first gear (3g) and the mass of the first copper rotating flywheel (3a) satisfy that the corresponding inertial coefficient of the first copper rotating flywheel (3a) is 1.5-2 times the mass of the mass ball (2b); the mass of the second gear (4h) and the mass of the second copper rotating flywheel (4f) satisfy that the corresponding inertial coefficient of the second copper rotating flywheel (4f) is 1.5-2 times the mass of the mass ball (2b).
6. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 3, characterized in that, The ratio of the distance between adjacent first permanent magnets (3e) to the width of the first permanent magnet (3e) itself is maintained at 0.65-0.85; the ratio of the distance between adjacent second permanent magnets (4e) to the width of the second permanent magnet (4e) itself is maintained at 0.65-0.
85.
7. The towed type universal eddy current tuned mass damper suitable for a wind power tower according to claim 3, characterized in that, The air gap size between the first permanent magnet (3e) and the first copper rotating flywheel (3a) and the air gap size between the second permanent magnet (4e) and the second copper rotating flywheel (4f) satisfy that the corresponding vertical additional damping ratio provided by the eddy current inertial damping device is 0.87%-7%.
8. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 1, characterized in that, The mass ball (2b) is provided with a chain interface (2c) around it, the chain interface (2c) is provided with a chain bearing (2d), and the traction chain is connected with the chain bearing (2d).
9. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 1, characterized in that, The length and stiffness of the rope (2a) satisfy that the ratio of the swing frequency of the mass ball (2b) to the natural frequency of the wind power tower (1) is 0.98-1.
02.
10. The towed universal eddy current tuned mass damper suitable for wind turbine towers according to claim 1, characterized in that, The upper end of the rope (2a) is hinged to the center position of the bottom of the cross support (2e), and the cross support (2e) is fixed on the wind power tower (1).