Novel eddy current tuned mass damper for blade vibration reduction

Abstract

A sliding mass seat is installed on a guide rail in a sliding mode, side fixing seats are fixed to the two ends of the guide rail respectively, a permanent magnet A is fixed to the positions, located on one side of the guide rail, of the two ends of the sliding mass seat, and a permanent magnet B is fixed to the positions, located on the other side of the guide rail, of the two ends of the sliding mass seat. Two metal conductor plates are fixed to the lower surface of the guide rail, and when the blade vibrates, the metal conductor plates can penetrate between the permanent magnet A and the permanent magnet B. Eddy current is generated when the metal conductor plate performs electromagnetic induction line cutting motion, the eddy current interacts with an original magnetic field to hinder relative motion of the metal conductor plate and the magnetic field, the eddy current is converted into heat energy to be dissipated due to the resistance effect in the metal conductor plate, the damping ratio of the blade structure can be increased, and the service life of the blade is prolonged. And in cooperation with the elastic buffering effect of the buffering spring A and the buffering spring B, effective vibration reduction is provided for the blade, and the service life of the blade is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a novel eddy current tuned mass damper for blade vibration reduction. Background Art

[0002] Wind turbine blades are one of the core components of wind turbines. The quality of their design is directly related to the performance and efficiency of the wind turbine. As blades grow larger, their weight and length increase, and the tip stiffness decreases. They are also subjected to gravity loads, inertia loads, and unsteady aerodynamic loads. Blades are prone to multi-directional vibrations under complex loads. However, as a key component for capturing wind energy, the performance of blades directly affects the wind energy utilization efficiency of the wind turbine structure and the load borne by the entire wind turbine unit. It also largely determines the overall performance, service life, and economic efficiency of wind energy development of the unit.

[0003] Wind turbine blade vibration is a common phenomenon during operation. However, in the long-term process of severe large deformation vibration, when the wind speed increases, the vibration of the wind turbine blade will continue to intensify. As the strength of the vibration coupling changes, the balance state of the blade is destroyed, and cracks will appear on the blade, leading to fatigue fracture, reducing the operating life of the wind turbine and affecting the final power generation of the wind turbine. Utility Model Content

[0004] The purpose of the utility model is to provide a novel eddy current tuned mass damper for blade vibration reduction, which effectively solves the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present utility model provides the following technical solutions.

[0006] A novel eddy current tuned mass damper for blade vibration reduction includes a guide rail and a sliding mass seat. The sliding mass seat is slidably mounted on the guide rail, and side fixing seats are fixed at both ends of the guide rail. Permanent magnets A are fixed on one side of the guide rail at both ends of the sliding mass seat, and permanent magnets B are fixed on the other side of the guide rail. Two metal conductor plates are fixed on the lower surface of the guide rail. When the blade vibrates, the metal conductor plates can pass between permanent magnets A and permanent magnets B. Buffer springs B are connected to the top of both sides of the sliding mass seat, and the ends of the two buffer springs B are connected to one of the side fixing seats. Buffer springs A are connected to the bottom of both sides of the two sliding mass seats, and the ends of the two buffer springs A are connected to the side fixing seat on the other side. The extension directions of the buffer springs A and buffer springs B remain parallel to the guide rail.

[0007] Preferably, a permanent magnet C is mounted on one end of the sliding mass seat, and a permanent magnet D is mounted on the side fixing seat close to the permanent magnet C via a mounting frame, and the permanent magnets C and D are of the same polarity and repel each other.

[0008] Preferably, a permanent magnet E is mounted on the end of the sliding mass seat away from the permanent magnet C, and a permanent magnet F is mounted on the side fixing seat close to the permanent magnet E through a mounting frame, and the permanent magnets E and F are in repulsive engagement.

[0009] Preferably, the two buffer springs A and the two buffer springs B are both in a tension shape.

[0010] Preferably, both ends of the sliding mass seat are provided with screw holes, and a mounting bolt is screwed into each screw hole with a matching thread. One end of the buffer spring A and the buffer spring B are respectively hung on the corresponding mounting bolts, and the ends of the buffer spring A and the buffer spring B away from the sliding mass seat are fixedly welded with fastening screws. Screw holes are provided on the two side fixing seats, and the fastening screws are screwed into the screw holes on the side fixing seats with a matching thread.

[0011] Preferably, the buffer spring A and the buffer spring B are both made of high-carbon spring steel.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) The utility model forms an eddy current damping structure by arranging permanent magnets A, permanent magnets B and metal conductor plates. When the metal conductor plates cut electromagnetic flux lines, eddy currents are generated. The eddy currents interact with the original magnetic field to generate a force that hinders the relative movement of the metal conductor plates and the magnetic field. On the other hand, the eddy currents are converted into heat energy and dissipated due to the resistance in the metal conductor plates. This can increase the damping ratio of the blade structure, accelerate the attenuation rate of the blade vibration amplitude, and cooperate with the elastic buffering effect of the buffer springs A and B to provide effective vibration reduction for the blades and improve the service life of the blades.

[0014] (2) When the sliding mass seat slides left and right along the guide rail, when the sliding mass seat drives the permanent magnet C to approach the permanent magnet D or drives the permanent magnet E to approach the permanent magnet F, the sliding mass seat uses the principle of like-charged magnets repelling each other to play a limiting buffering role when reaching the maximum stroke, thereby reducing or avoiding the instantaneous impact force of the sliding mass seat on the guide rail and the side fixed seat during movement, thereby effectively reducing the impact of the new blade vibration reduction eddy current tuned mass damper body on the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 3 Schematic diagram of the motion direction of the new blade vibration reduction eddy current tuned mass damper;

[0018] Figure 4 Schematic diagram of blade cross-section damper installation. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] like Figures 1 to 4 As shown, a novel eddy current tuned mass damper for blade vibration reduction includes a guide rail 1, a sliding mass seat 2, a mounting bolt 201, a permanent magnet A21, a permanent magnet B22, a side fixing seat 3, a fastening screw 301, a mounting frame 31, a buffer spring A4, a buffer spring B5, a permanent magnet C6, a permanent magnet D61, a permanent magnet E7, a permanent magnet F71, a metal conductor plate 8, a first mounting slot 9 and a second mounting slot 10.

[0021] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] like Figures 1 to 4As shown, the sliding mass seat 2 is slidably installed on the guide rail 1. The guide rail 1 is long enough and has high straightness, which can accurately guide the movement of the sliding mass seat 2. At the same time, the length of the guide rail 1 can meet the vibration reduction requirements of the wind turbine blades under large amplitude working conditions. Side fixing seats 3 are fixed at both ends of the guide rail 1. Permanent magnets A21 are fixed on one side of the guide rail 1 at both ends of the sliding mass seat 2, and permanent magnets B22 are fixed on the other side of the guide rail 1. Two metal conductor plates 8 are fixed on the lower surface of the guide rail 1. When the blade vibrates, the metal conductor plates 8 can pass between the permanent magnets A21 and B22. Buffer springs B5 are connected to the top of both side parts of the sliding mass seat 2, and the ends of the two buffer springs B5 are connected to one of the side fixing seats 3 on one side. Buffer springs A4 are connected to the bottom of both side parts of the two sliding mass seats 2, and the ends of the two buffer springs A4 are connected to the side fixing seat 3 on the other side. The extension directions of the buffer springs A4 and the buffer springs B5 are both parallel to the guide rail 1.

[0024] The new blade vibration reduction eddy current tuned mass damper is installed inside the blade. When the blade vibrates, the sliding mass seat 2 is caused to move left and right along the guide rail 1. The uniform movement direction of the sliding mass seat 2 is as follows: Figure 3 As shown, the metal conductor plate 8 and the magnetic field formed by the permanent magnets A21 and B22 move relative to each other, and the metal conductor plate 8 moves to cut the electromagnetic lines of force between the permanent magnets A21 and B22, thereby generating eddy currents in the metal conductor plate 8. On the one hand, the eddy currents interact with the original magnetic field to generate a force that hinders the relative movement of the metal conductor plate 8 and the magnetic field. On the other hand, the eddy currents are converted into heat energy and dissipated due to the resistance in the metal conductor plate 8, which can increase the damping ratio of the blade structure and cooperate with the elastic buffering effect of the buffer spring A4 and the buffer spring B5 to achieve effective buffering and shock absorption for the blade.

[0025] The utility model forms an eddy current damping structure by arranging permanent magnets A21, permanent magnets B22 and a metal conductor plate 8. When the metal conductor plate 8 cuts the electromagnetic flux lines, eddy currents are generated. The eddy currents interact with the original magnetic field to generate a force that hinders the relative movement of the metal conductor plate 8 and the magnetic field. On the other hand, the eddy currents are converted into heat energy and dissipated due to the resistance in the metal conductor plate 8, which can increase the damping ratio of the blade structure, accelerate the attenuation rate of the blade vibration amplitude, and cooperate with the elastic buffering effect of the buffer spring A4 and the buffer spring B5 to provide effective vibration reduction for the blade and improve the service life of the blade.

[0026] A permanent magnet C6 is installed on one end of the sliding mass seat 2, and a permanent magnet D61 is installed on the side fixed seat 3 close to the permanent magnet C6 through the mounting frame 31. The permanent magnet C6 and the permanent magnet D61 are in a repulsive relationship with each other. A permanent magnet E7 is installed on the end of the sliding mass seat 2 away from the permanent magnet C6, and a permanent magnet F71 is installed on the side fixed seat 3 close to the permanent magnet E7 through the mounting frame 31. The permanent magnet E7 and the permanent magnet F71 are in a repulsive relationship with each other.

[0027] When the sliding mass seat 2 slides left and right along the guide rail 1, when the sliding mass seat 2 drives the permanent magnet C6 to approach the side of the permanent magnet D61 or drives the permanent magnet E7 to approach the side of the permanent magnet F71, the principle of like-charged magnets repel each other is utilized, so that the sliding mass seat 2 plays a limiting and buffering role when reaching the maximum stroke, reducing or avoiding the instantaneous impact force of the sliding mass seat 2 on the guide rail 1 and the side fixed seat 3 during movement, thereby effectively reducing the impact of the new blade vibration reduction eddy current tuned mass damper body on the blade.

[0028] The two buffer springs A4 and the two buffer springs B5 are both in a tensile state. Using the tensile buffer springs A4 and B5 can avoid the problems of bending and instability caused by the use of cylindrical helical compression springs, ensure that the direction of the buffer spring force remains parallel to the guide rail 1, and improve the elastic buffering effect.

[0029] There are screw holes at both ends of the sliding mass seat 2, and a mounting bolt 201 is screwed into each screw hole with matching threads. One end of the buffer spring A4 and the buffer spring B5 is respectively hung on the corresponding mounting bolt 201. By hanging on the mounting bolt 201, one end of the buffer spring A4 and the buffer spring B5 has a detachable effect. The buffer spring A4 and the buffer spring B5 are fixedly welded with fastening screws 301 on the ends away from the sliding mass seat 2. Screw holes are provided on the two side fixing seats 3, and the fastening screws 301 are respectively screwed into the screw holes on the side fixing seats 3 with matching threads. By tightening the fastening screws 301 into the screw holes on the side fixing seats 3, the other end of the buffer spring A4 and the buffer spring B5 has a detachable effect, so that when the elasticity of the buffer spring A4 and the buffer spring B5 fails or is deformed after long-term use, it is convenient to disassemble and replace them.

[0030] Both buffer spring A4 and buffer spring B5 are made of high-carbon spring steel. The buffer spring A4 and buffer spring B5 made of high-speed spring steel have the characteristics of high strength, high elasticity, and low fatigue, thus having a longer service life and reducing the frequency of disassembly and replacement.

[0031] During installation, if Figure 4As shown, first, a first mounting groove 9 and a second mounting groove 10 are set in the blade, and the first mounting groove 9 and the second mounting groove 10 are arranged vertically. Then, when two new eddy current tuned mass dampers for blade vibration reduction are respectively installed in the first mounting groove 9 and the second mounting groove 10, it is ensured that the two new eddy current tuned mass dampers for blade vibration reduction are arranged vertically, so that they work together to achieve two-way vibration reduction, thereby ensuring good buffering and vibration reduction effect on the blade.

[0032] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, modifications, equivalent changes, improvements, etc. made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A novel eddy current tuned mass damper for blade vibration reduction, characterized by: The invention comprises a guide rail (1) and a sliding mass seat (2); the sliding mass seat (2) is slidably mounted on the guide rail (1), and side fixing seats (3) are fixed to both ends of the guide rail (1); a permanent magnet A (21) is fixed to one side of the guide rail (1) at both ends of the sliding mass seat (2), and a permanent magnet B (22) is fixed to the other side of the guide rail (1); two metal conductor plates (8) are fixed to the lower surface of the guide rail (1), and when the blade vibrates, the metal conductor plates (8) can move between the permanent magnet A (21) and the blade. and the permanent magnet B (22); buffer springs B (5) are connected to the upper part of both sides of the sliding mass seat (2), and the ends of the two buffer springs B (5) are connected to the side fixing seat (3) on one side; buffer springs A (4) are connected to the lower part of both sides of the sliding mass seat (2), and the ends of the two buffer springs A (4) are connected to the side fixing seat (3) on the other side; the extension directions of the buffer springs A (4) and the buffer springs B (5) are both parallel to the guide rail (1).

2. The novel eddy current tuned mass damper for blade vibration reduction according to claim 1 is characterized in that: A permanent magnet C (6) is mounted on one end of the sliding mass seat (2), and a permanent magnet D (61) is mounted on the side fixing seat (3) close to the permanent magnet C (6) via a mounting frame (31); the permanent magnet C (6) and the permanent magnet D (61) are in a repulsive fit with the same polarity.

3. The novel eddy current tuned mass damper for blade vibration reduction according to claim 2 is characterized in that: A permanent magnet E (7) is mounted on one end of the sliding mass seat (2) away from the permanent magnet C (6), and a permanent magnet F (71) is mounted on the side fixing seat (3) close to the permanent magnet E (7) via a mounting frame (31); the permanent magnet E (7) and the permanent magnet F (71) are in mutual repulsion.

4. The novel eddy current tuned mass damper for blade vibration reduction according to claim 1 is characterized in that: The two buffer springs A (4) and the two buffer springs B (5) are both in a tension state.

5. The novel eddy current tuned mass damper for blade vibration reduction according to claim 1 is characterized in that: Both ends of the sliding mass seat (2) are provided with screw holes, and a mounting bolt (201) is screwed in each screw hole with matching threads, and one end of the buffer spring A (4) and the buffer spring B (5) are respectively mounted on the corresponding mounting bolt (201); the ends of the buffer spring A (4) and the buffer spring B (5) away from the sliding mass seat (2) are fixedly welded with a fastening screw (301); the two side fixing seats (3) are both provided with screw holes, and the fastening screws (301) are respectively screwed in the screw holes on the side fixing seats (3) with matching threads.

6. The novel eddy current tuned mass damper for blade vibration reduction according to claim 1 is characterized in that: The buffer spring A (4) and the buffer spring B (5) are both made of high-carbon spring steel.

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