Damping system for inhibiting bending-torsion coupling vibration and deformation of wind power blade and construction method

Abstract

The invention discloses a damping system for suppressing bending-torsion coupling vibration and deformation of a wind power blade and a construction method.The damping system comprises an eddy current damping generation mechanism, two first inhaul cables and two second inhaul cables, and the eddy current damping generation mechanism comprises a mounting support, two permanent magnet assemblies and a conductor assembly; the mounting bracket is mounted at the root of the blade; the two permanent magnet assemblies and the conductor assembly are rotationally mounted on the mounting bracket respectively; one ends of the two first inhaul cables are connected with the two ends of the conductor assembly respectively, and the other ends of the two first inhaul cables are tightly attached to the inner walls of the windward side and the leeside of the blade respectively, extend according to a preset track and are fixed to the blade tip. One ends of the two second inhaul cables are connected with the two permanent magnet assemblies correspondingly, and the other ends of the two second inhaul cables extend and are fixed to the front edge and the tail wing of the preset wing-shaped section of the blade tip correspondingly. The problems of bending-torsion coupling vibration and insufficient clearance of the flexible blade of the large-scale wind turbine can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blades, and in particular to a damping system and a construction method for suppressing the bending-torsion coupling vibration and deformation of wind turbine blades. Background Art

[0002] With the development of low-wind-speed wind power generation technology, in order to increase power generation and wind energy utilization rate and expand the siting range of wind farms, wind turbines are developing in the direction of larger impeller diameters. Currently, the largest wind wheel diameter has exceeded 250m. As the blade length increases, the entire wind turbine structure system becomes more flexible. The clearance problem caused by the deformation of long and flexible blades and the bending-torsion coupling aerodynamic instability problem of the blades become increasingly prominent. Such problems will cause the wind power generation unit to frequently trigger fault alarms, resulting in power generation loss due to unit shutdown. Long-term bending-torsion coupling vibration will seriously reduce the fatigue life of the blades, and blade fracture will occur during bending-torsion coupling flutter, resulting in greater economic losses. Therefore, the problem of suppressing the deformation and vibration of large-aspect-ratio large wind turbine blades has gradually become the technological high point and core competitiveness of the current wind power industry. In view of the unique structure and vibration characteristics of wind turbines, it is urgent to design a damping system for suppressing the bending-torsion coupling vibration and deformation of wind turbine blades to ensure the structural safety of large-scale blades. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a damping system for suppressing the bending-torsion coupling vibration and deformation of wind turbine blades, which can effectively solve the problems of bending-torsion coupling vibration of flexible blades of large-scale wind turbines and insufficient blade clearance.

[0004] Another purpose of the present invention is to provide a construction method for a damping system for suppressing the bending-torsion coupling vibration and deformation of wind turbine blades.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade, comprising an eddy current damping generating mechanism, two first cables and a second cable. The eddy current damping generating mechanism includes a mounting bracket, two permanent magnet assemblies and a conductor assembly. The mounting bracket is installed at the root position of the blade. The two permanent magnet assemblies and the conductor assembly are respectively rotatably installed on the mounting bracket. The two permanent magnet assemblies are symmetrically arranged on both sides of the conductor assembly and are spaced apart from the conductor assembly. One end of each of the two first cables is connected to both ends of the conductor assembly respectively, and the other end extends along a predetermined trajectory and is fixed to the blade tip tightly against the inner walls of the windward side and the leeward side of the blade. One end of each of the two second cables is connected to the two permanent magnet assemblies respectively, and the other end extends and is fixed to the leading edge and the trailing edge of a preset airfoil section at the blade tip. When the blade undergoes bending-torsion coupling vibration, in the direction of the blade bending vibration, one first cable is on the tension side and the other first cable is on the compression side. The first cable on the tension side drives the first cable on the compression side to move, thereby driving the rotation of the conductor assembly. At this time, the conductor assembly rotates and cuts the magnetic induction lines generated by the permanent magnet assembly, generating a resistance force that hinders the rotation of the conductor assembly, and finally transmits to the blade tip through the first cable, achieving the purpose of reducing the amplitude of the blade bending vibration. In the direction of the blade torsion vibration, the blade torsion vibration drives the second cable to move, thereby driving the rotation of the permanent magnet assembly. At this time, the conductor assembly cuts the magnetic induction lines generated by the permanent magnet assembly, generating a resistance force that hinders the rotation of the permanent magnet assembly, and finally transmits to the blade tip through the second cable, achieving the purpose of reducing the amplitude of the blade torsion vibration.

[0007] Further, the conductor assembly includes a first gear, a conductor disc and an arc-shaped toothed belt. The first gear is installed on the mounting bracket through a rotating bearing. There are two conductor discs, symmetrically arranged on both sides of the first gear and capable of rotating synchronously with the first gear. The arc-shaped toothed belt meshes with the first gear, and its two ends are respectively connected to the two first cables.

[0008] Further, the permanent magnet assembly includes a second gear, a back iron disc, a permanent magnet, a vertical rack and a spring. The second gear is installed on the mounting bracket through a rotating bearing. The back iron disc is arranged on the side of the second gear facing the conductor assembly and can rotate synchronously with the second gear. The N poles and S poles of the permanent magnets are arranged in a circumferential staggered manner on the back iron disc, thereby forming an induction magnetic field. The vertical rack meshes with the second gear, one end of which is fixed to the base of the mounting bracket through a spring, and the other end is connected to the second cable.

[0009] Further, the first cable is fixed to the inner wall of the windward side or the leeward side of the blade through a positioning guide block.

[0010] Further, the second cable is fixed to the leading edge or the trailing edge of a preset airfoil section at the blade tip through a guiding support member.

[0011] Furthermore, the mounting bracket includes a base, two main shaft brackets and a main shaft. The base is fixed at the blade root, the two main shaft brackets are symmetrically arranged on the base, and the main shaft is fixedly installed on the two main shaft brackets for installing the permanent magnet assembly and the conductor assembly.

[0012] Another object of the present invention is achieved by the following technical solution:

[0013] A construction method of a damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade includes the steps of

[0014] After completing the laying of the main materials of the blade according to the set laying process, while the pre-curing of the infusion is carried out, the vacuum curing and forming of the anchoring holes of the first cable and the second cable are synchronously carried out;

[0015] After the two half membranes of the blade are hardened and formed, corresponding first cable and second cable channels are drilled on the blade core material, and the first cable and the second cable are pre-passed according to the hole positions arranged on the two half membranes, and the cable anchoring state is checked to keep it in a relaxed state;

[0016] After completing the production of the entire blade according to the set production process, the mounting bracket is pre-installed on the hole positions of the root connection bolts of the blade through bolts, so as to pre-install the mounting bracket at the blade root;

[0017] Connect the first cable and the second cable to the conductor assembly and the permanent magnet assembly on the mounting bracket respectively. After adjusting the appropriate lengths of the first cable and the second cable, tighten the bolts of the mounting bracket to complete the construction.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. The damping system of the present invention is small in volume. One end is installed at the blade root, and the other end is installed at the blade tip where the vibration amplitude is the largest and the space is very limited, which can effectively avoid affecting the aerodynamic shape of the blade; at the same time, by making full use of the difference in the bending and torsional deformation amounts of the blade, three gears are promoted to drive their respective accessories to move relatively, thereby cutting the magnetic induction lines to consume energy, and the damping and energy consumption effect is further promoted through the inertia of the rotating structure; in addition, by making full use of the cable, which is a member that only transmits tension, the large deformation at the blade tip is transmitted to the blade root for damping and energy consumption, and the length of the cable can be adjusted according to the sizes of different types of blades, which is applicable to various types of wind turbines.

[0020] 2. The damping system of the present invention has a low cost, is easy to install and maintain, has a broad commercial application prospect, and can be fixed by means of the bolts of the pitch bearing at the blade root end during actual use to ensure pitch movement synchronously with the blade, ensure that the cable is not twisted and broken, and has strong operability. Description of the Drawings

[0021] Figure 1 This is the front view of the damping system of the present invention.

[0022] Figure 2 This is the side view of the damping system of the present invention.

[0023] Figure 3 is Figure 2 the sectional view taken along the A-A direction of

[0024] Figure 4 This is the three-dimensional schematic diagram of the eddy current damping generating mechanism of the present invention.

[0025] Figure 5 This is the top view of the eddy current damping generating mechanism of the present invention.

[0026] Figure 6 This is the side view of the eddy current damping generating mechanism of the present invention.

[0027] Figure 7 This is the front view of the eddy current damping generating mechanism of the present invention.

[0028] Figure 8 is Figure 5 the sectional view taken along the B-B direction of

[0029] Figure 9 This is the front view of the permanent magnet assembly of the present invention.

[0030] Figure 10 This is the three-dimensional schematic diagram of the positioning and guiding block of the present invention.

[0031] Figure 11 This is the three-dimensional schematic diagram of the guiding and supporting member of the present invention. Detailed Embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1:

[0034] As Figures 1 to 3As shown in the figure, this embodiment provides a damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade, which includes an eddy current damping generation mechanism, two first cables 4 and a second cable 5; the eddy current damping generation mechanism includes a conductor assembly 1, two permanent magnet assemblies 2 and a mounting bracket 3. The mounting bracket 3 is installed at the root position of the blade 8. The two permanent magnet assemblies 2 and the conductor assembly 1 are respectively rotatably installed on the mounting bracket, and the two permanent magnet assemblies are symmetrically arranged on both sides of the conductor assembly and are spaced from the conductor assembly; one end of each of the two first cables 4 is respectively connected to both ends of the conductor assembly, and the other end extends along a predetermined trajectory and is fixed to the blade tip respectively by closely adhering to the inner walls of the windward and leeward surfaces of the blade. The two first cables need to maintain a certain pre-tightening force; one end of each of the two second cables 5 is respectively connected to the two permanent magnet assemblies, and the other end extends and is fixed to the leading edge and the trailing edge of a preset airfoil section at the blade tip respectively. The two second cables need to maintain a certain pre-tightening force, and preferably an airfoil section with relatively large torsional deformation is selected.

[0035] When the blade undergoes bending-torsion coupling vibration, in the direction of the blade's bending vibration, one first cable 4 is on the tension side and the other first cable 4 is on the compression side. The material on the tension side of the blade will undergo large tensile deformation, and the compression will cause large compressive deformation. Since the elastic modulus of the cable material is inconsistent with that of the blade material, the cable deformation is very small. Therefore, the first cable 4 on the tension side can drive the first cable 4 on the compression side to move, thereby driving the conductor assembly to rotate. At this time, the conductor assembly rotates and cuts the magnetic induction lines generated by the permanent magnet assembly, generating a resistance that hinders the rotation of the conductor assembly, and finally being transmitted to the blade tip through the first cable 4 to achieve the purpose of reducing the amplitude of the blade's bending vibration; in the direction of the blade's torsional vibration, the second cable 5 is driven to move by the blade's torsional vibration, thereby driving the permanent magnet assembly to rotate. At this time, the conductor assembly cuts the magnetic induction lines generated by the permanent magnet assembly, generating a resistance that hinders the rotation of the permanent magnet assembly, and finally being transmitted to the blade tip through the second cable 5 to achieve the purpose of reducing the amplitude of the blade's torsional vibration.

[0036] As Figures 4 to 8 shown in the figure, the conductor assembly 1 includes a first gear 101, a conductor disk 102 and an arc-shaped toothed belt 103. The first gear 101 is installed on the mounting bracket through a rotating bearing. There are two conductor disks 102, which are symmetrically arranged on both sides of the first gear 101 and can rotate synchronously with the first gear 101. The arc-shaped toothed belt 103 meshes with the first gear 101, and its two ends are respectively connected to the two first cables 4. When the first cables 4 are connected, a certain pre-tightening force is maintained, which has a prestress effect and can greatly reduce the static deformation of the blade.

[0037] As Figure 9As shown in the figure, the permanent magnet assembly 2 includes a second gear 201, a back iron disk 202, permanent magnets 203, a vertical rack 204, and a spring 205. The second gear 201 is mounted on the mounting bracket through a rotary bearing. The back iron disk 202 is disposed on the side of the second gear 201 facing the conductor assembly and can rotate synchronously with the second gear 201. The N poles and S poles of the permanent magnets 203 are arranged in a circumferential staggered manner on the back iron disk 202 to form an induced magnetic field. The vertical rack 204 meshes with the second gear 201. One end of the vertical rack 204 is fixed to the base 301 of the mounting bracket through a spring, and the other end is connected to the second cable 5. When the second cable 5 is connected, a certain pre-tension is maintained, and the spring is kept in a tensioned state, achieving a prestress effect, which can greatly reduce the static deformation of the blade.

[0038] The mounting bracket 3 includes a base 301, two main shaft brackets 302, and a main shaft 303. The base 301 is fixed at the blade root and can be fixed to the blade root pitch bearing bolt through forms such as screw holes and can move together with the blade pitch. The two main shaft brackets 302 are symmetrically arranged on the base 301, and the main shaft 303 is fixedly installed on the two main shaft brackets 302 for mounting the permanent magnet assembly and the conductor assembly.

[0039] As Figure 10 shown, in order to make the first cable 4 closely adhere to the inner wall of the blade and be able to extend to the blade tip along a predetermined trajectory, the first cable 4 is fixed to the inner wall of the windward or leeward surface of the blade through a positioning guide block 6.

[0040] As Figure 11 shown, the second cable 5 is fixed to the leading edge or trailing edge of the preset airfoil section at the blade tip through a guide support 7, and the second cable 5 is fixed and guided through the guide support.

[0041] Embodiment 2:

[0042] This embodiment provides a construction method for a damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade, including the steps of

[0043] After the laying of the main blade materials is completed according to the set laying process, during the pre-curing of the infusion, the vacuum curing and forming of the anchoring hole positions of the first cable and the second cable are carried out synchronously, so as to ensure the firmness and reliability of the anchoring hole positions;

[0044] After the two half membranes of the blade are hardened and formed, corresponding first cable and second cable holes are drilled on the blade core material, and the first cable and the second cable are pre-passed according to the hole positions arranged on the two half membranes. To facilitate the membrane combination of the two half membranes, at this time, the cables are located in the inner cavities of the two half membranes, and the cable anchoring state inside the blade is checked again to keep it in a relaxed state without affecting any membrane combination operation process;

[0045] After completing the production of the entire blade according to the set manufacturing process, pre-install the mounting bracket onto the hole positions of the root connection bolts of the blade through bolts, thereby pre-installing the mounting bracket at the blade root;

[0046] Connect the first cable and the second cable to the conductor assembly and the permanent magnet assembly on the mounting bracket respectively. After adjusting the appropriate lengths of the first cable and the second cable, tighten the bolts of the mounting bracket to complete the construction.

[0047] In addition, after the installation of the wind turbine tower, the main unit, and the hub is completed, hoist the blade, and then synchronously connect the hub, the blade, and the damping system. Conduct a blade pitch test to ensure the motion synchronization of the blade and the damping system.

[0048] The above construction process will not affect the construction process of the entire blade. The damping system synchronously plays a vibration damping role during the transportation of the entire blade, ensuring the safety of the blade structure during transportation.

[0049] The above is only a preferred embodiment of the present invention for the patent, but the protection scope of the present invention for the patent is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention for the patent, according to the technical solution of the present invention for the patent and its inventive concept, makes equivalent substitutions or changes, all belong to the protection scope of the present invention for the patent.

Claims

1. A damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade, characterized in that: It includes an eddy current damping generating mechanism, two first cables and a second cable. The eddy current damping generating mechanism includes a mounting bracket, two permanent magnet assemblies and a conductor assembly. The mounting bracket is installed at the root position of the blade. The two permanent magnet assemblies and the conductor assembly are respectively rotatably installed on the mounting bracket. The two permanent magnet assemblies are symmetrically arranged on both sides of the conductor assembly and are spaced from the conductor assembly. One end of each of the two first cables is connected to both ends of the conductor assembly respectively, and the other end extends along a predetermined trajectory and is fixed to the tip of the blade by closely adhering to the inner walls of the windward side and the leeward side of the blade. One end of each of the two second cables is connected to the two permanent magnet assemblies respectively, and the other end extends and is fixed to the leading edge and the trailing edge of a preset airfoil section at the tip of the blade. When the blade undergoes bending-torsion coupling vibration, in the direction of the blade bending vibration, one first cable is on the tension side and the other first cable is on the compression side. The first cable on the tension side drives the first cable on the compression side to move, thereby driving the rotation of the conductor assembly. At this time, the conductor assembly rotates and cuts the magnetic induction lines generated by the permanent magnet assembly, generating a resistance that hinders the rotation of the conductor assembly. Finally, it is transmitted to the tip of the blade through the first cable, achieving the purpose of reducing the amplitude of the blade bending vibration. In the direction of the blade torsion vibration, the blade torsion vibration drives the second cable to move, thereby driving the rotation of the permanent magnet assembly. At this time, the conductor assembly cuts the magnetic induction lines generated by the permanent magnet assembly, generating a resistance that hinders the rotation of the permanent magnet assembly. Finally, it is transmitted to the tip of the blade through the second cable, achieving the purpose of reducing the amplitude of the blade torsion vibration.

2. The damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade according to claim 1, characterized in that: The conductor assembly includes a first gear, a conductor disc and an arc-shaped toothed belt. The first gear is installed on the mounting bracket through a rotary bearing. There are two conductor discs, which are symmetrically arranged on both sides of the first gear and can rotate synchronously with the first gear. The arc-shaped toothed belt meshes with the first gear, and its two ends are respectively connected to the two first cables.

3. The damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade according to claim 1, characterized in that: The permanent magnet assembly includes a second gear, a back iron disc, permanent magnets, a vertical rack and a spring. The second gear is installed on the mounting bracket through a rotary bearing. The back iron disc is arranged on the side of the second gear facing the conductor assembly and can rotate synchronously with the second gear. The N poles and S poles of the permanent magnets are arranged in a circumferential staggered manner on the back iron disc, thereby forming an induction magnetic field. The vertical rack meshes with the second gear, one end of which is fixed to the base of the mounting bracket through a spring, and the other end is connected to the second cable.

4. The damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade according to claim 1, characterized in that: The first cable is fixed to the inner wall of the windward side or the leeward side of the blade through a positioning guide block.

5. The damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade according to claim 1, wherein: The second cable is fixed to the leading edge or the trailing edge of a preset airfoil section at the tip of the blade through a guiding support.

6. The damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade according to claim 1, wherein: The mounting bracket includes a base, two main shaft brackets and a main shaft. The base is fixed at the root of the blade. The two main shaft brackets are symmetrically arranged on the base. The main shaft is fixedly installed on the two main shaft brackets and is used to install the permanent magnet assembly and the conductor assembly.

7. A construction method of a damping system for suppressing the bending-torsion coupling vibration and deformation of a wind turbine blade according to any one of claims 1 to 6, characterized in that, Including steps, After completing the laying of the main materials of the blade according to the set laying process, while injecting the pre-curing, the vacuum curing and forming of the anchoring holes of the first cable and the second cable are carried out synchronously. After the two semi-membranes of the blade are hardened and formed, corresponding first cable and second cable holes are drilled on the blade core material. The first cable and the second cable are pre-threaded according to the hole positions arranged on the two semi-membranes, and the cable anchoring state is checked to keep it in a relaxed state; After the production of the entire blade is completed according to the set manufacturing process, the mounting bracket is pre-installed on the hole positions of the blade root connection bolts through bolts, so as to pre-install the mounting bracket at the blade root; The first cable and the second cable are respectively connected to the conductor assembly and the permanent magnet assembly on the mounting bracket. After adjusting the appropriate lengths of the first cable and the second cable, the bolts of the mounting bracket are tightened to complete the construction.

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