CN109114159B - Eddy current vibration damper suitable for wind power blade and mounting method - Google Patents
Eddy current vibration damper suitable for wind power blade and mounting method Download PDFInfo
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- CN109114159B CN109114159B CN201811127092.4A CN201811127092A CN109114159B CN 109114159 B CN109114159 B CN 109114159B CN 201811127092 A CN201811127092 A CN 201811127092A CN 109114159 B CN109114159 B CN 109114159B
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- 238000000034 method Methods 0.000 title claims description 9
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 79
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 76
- 239000010959 steel Substances 0.000 claims abstract description 76
- 229910045601 alloy Inorganic materials 0.000 claims description 54
- 239000000956 alloy Substances 0.000 claims description 54
- 238000013016 damping Methods 0.000 claims description 33
- 238000003466 welding Methods 0.000 claims description 31
- 229920006332 epoxy adhesive Polymers 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 10
- 238000009434 installation Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000306 component Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
- F16F15/035—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means by use of eddy or induced-current damping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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Abstract
The eddy current vibration damper suitable for wind power blades comprises an upper eddy current plate, a lower eddy current plate, a shape memory alloy spring, a permanent magnet, a steel cable, an upper fixing support, a lower fixing support and a shielding shell. The upper eddy current plate and the lower eddy current plate are respectively welded on one side of the upper fixing support and the lower fixing support through the shape memory alloy spring, the permanent magnet is a cylinder, the steel cable is sleeved with the middle hole and can freely slide along the steel cable, one end of the steel cable sequentially penetrates through the upper fixing support, the upper eddy current plate and the permanent magnet and is welded on the upper surface of the lower eddy current plate, the other end of the steel cable is connected with the blade tip of the blade through an R-shaped steel bar pull ring, the vibration of the blade tip drives the lower eddy current plate to be close to the permanent magnet through the steel cable, and the centripetal force of the permanent magnet is changed along with the increase and decrease of the rotation speed of the wind-powered blade, so that the lower eddy current plate is close to or far away from the.
Description
Technical Field
The invention relates to the technical field of wind power structure vibration reduction control, in particular to an eddy current vibration reduction device suitable for a wind power blade.
Background
Wind power is one of the most mature power generation modes with the most scale development and commercial development prospects in the development and utilization of renewable energy sources at present, and is increasingly paid attention from all countries in the world, so that the wind power is widely developed and utilized.
The wind generating set is a generating set which comprises blades, a transmission system, a generator, a gear box, a converter, an electric appliance control system, a tower and the like, wherein the blades are core components for ensuring that the wind generating set effectively captures wind energy and converts the wind energy into mechanical energy and electric energy, and the performance and the generating capacity of a fan are directly influenced. The length of the wind power blade is rapidly increased in recent years, the wind energy utilization rate is improved along with the increase of the size of the blade, the adverse effect of the vibration of the blade on a wind generating set is reduced, and the wind power blade becomes an important attention point in the current society.
The wind power blade is large in size, is positioned at the top of the tower and is in a rotating state, so that the maintenance is inconvenient, all vibration reduction designs are suitable for complex external environments such as high-altitude cyclone power, temperature difference transformation and the like, and the requirement on the durability of the wind power blade is met. The electric eddy current damper works based on the principle that a conductor moves in a magnetic field or generates an electric eddy current effect in an alternating magnetic field, has the advantages of non-contact, no mechanical friction, no need of lubrication, long service life and the like, and meets the requirements of wind power blades on the damper. Meanwhile, the internal energy source of the wind power blade is inconvenient to supply, the problem of energy consumption needs to be considered in designing the eddy current damper, and the permanent magnet type eddy current damper does not need external energy supply and has great advantages in this respect. And the internal space and the effective bearing of the wind power blade are limited, and the eddy current damping structure and the vibration reduction system are compact as much as possible and have lighter structures.
Disclosure of Invention
The invention aims to provide an eddy current vibration damper suitable for a wind power blade and an installation method.
The invention relates to an eddy current vibration damper suitable for a wind power blade and an installation method. The eddy current vibration damper suitable for the wind power blade comprises an eddy current plate, an alloy limiting ring, a shape memory alloy spring, a permanent magnet 819, a fixed support, a shielding shell 814 and a No. 2 antifriction rubber transparent sleeve 824, wherein the shielding shell 814 is cylindrical, the permanent magnet 819 is cylindrical, a circular through hole is formed in the center of the permanent magnet 819, the alloy limiting ring comprises an upper alloy limiting ring 812 and a lower alloy limiting ring 813, and the upper alloy limiting ring 812 and the lower alloy limiting ring 813 are welded on the inner side of the shielding shell 814; the electric vortex plate comprises an upper electric vortex plate 811 and a lower electric vortex plate 815, and a circular through hole is formed in the center of the upper electric vortex plate 811; the shape memory alloy spring comprises a first No. 1 shape memory alloy spring 816, a second No. 1 shape memory alloy spring 823 and a No. 2 shape memory alloy spring 7; the fixed support comprises an upper fixed support 822 and a lower fixed support 818 which are respectively welded at two ends of a shielding shell 814, wherein a circular through hole is arranged at the central position of the upper fixed support 822, an upper eddy current plate 811 and the upper fixed support 822 are welded by a second No. 1 shape memory alloy spring 823, the outer side of the lower fixed support 818 is connected with the inner surface of the wind power blade 9 by 4 No. 2 shape memory alloy springs 7, a lower eddy current plate 815 and the inner side of the lower fixed support 818 are welded by a first No. 1 shape memory alloy spring 816, one end of a steel cable 2 is welded at the center of the other side of the lower eddy current plate 815, one side of the steel cable 2 matched with a No. 2 antifriction rubber transparent sleeve 824 passes through a lower alloy spacing ring 813, a permanent magnet 819, an upper alloy spacing ring 812, the upper eddy current plate 811, the first No. 1 shape memory alloy spring 816 and the upper fixed support 822 to be connected with the blade tip, the assembly of the whole damping device is formed.
The invention discloses an installation method of an eddy current vibration damper suitable for a wind power blade, which comprises the following steps:
step 1: based on the shielding case 814, sliding balls 820 are loaded into ball clamping grooves 821 on the inner wall of the shielding case 814, and after lubricating oil is filled, two ends of the clamping grooves are sealed; welding an upper alloy limiting ring 812 at a corresponding position, and welding a lower alloy limiting ring 813 at a corresponding position after a permanent magnet 819 is arranged;
step 2: welding one end of a first No. 1 shape memory alloy spring 816 on the inner surface of the lower fixing support 818, welding the other end of the first No. 1 shape memory alloy spring on one side of a lower eddy current plate 815, and welding one end of a steel cable 2 on the other side of the lower eddy current plate 815;
and step 3: welding one end of a second No. 1 shape memory alloy spring 823 on the inner surface of the upper fixed support 822, and welding the other end of the second No. 1 shape memory alloy spring on one side of the upper eddy current plate 811;
and 4, step 4: after the other end of the connected steel cable 2 is matched with a No. 2 antifriction rubber transparent sleeve 824 to sequentially pass through a lower alloy limiting ring 813, a permanent magnet 819, an upper alloy limiting ring 812, an upper eddy current plate 811, a second No. 1 shape memory alloy spring 823 and an upper fixing support 822, the end of the steel cable 2 is matched with a No. 1 antifriction rubber sleeve 4 to pass through an R-shaped steel bar pull ring 1 and is firmly anchored by a steel bar buckle 3;
and 5: welding the connected upper fixing support 822 and lower fixing support 818 with the two ends of the shielding shell 814 respectively;
step 6: adhering the R-shaped steel bar pull ring 1 connected to the steel cable 2 to the inner surface of the blade tip of the wind power blade 9 by using an epoxy adhesive;
and 7: 4 pieces of No. 2 shape memory alloy springs 7 are welded on a bottom welding block 817 of an installed lower fixed support 818, the other ends of the No. 2 shape memory alloy springs 7 are respectively matched with No. 2 shape memory alloy spring connectors 10 to be connected with the R-shaped steel bar pull ring 1, the No. 2 shape memory alloy springs 7 are tensioned and firmly anchored by steel bar buckles 3, and the 4 pieces of the R-shaped steel bar pull ring 1 are adhered to the inner surface of the middle part of the wind power blade 9 by epoxy adhesive;
and 8: and the lower end of the selected small viscous damper 5 is connected with a No. 2U-shaped fixed support 157 through a No. 2 screw 519 and a No. 2 nut 516, the bottom plate 518 of the No. 2U-shaped fixed support 157 is adhered to the inner surface of the wind power blade 9 through epoxy adhesive, and the upper end of the small viscous damper is connected with a No. 1U-shaped fixed support 810 reserved on the upper fixed support 822 through a No. 1 screw 825 and a No. 1 nut 826, so that the whole damping device is assembled.
Compared with the prior art, the invention has the following advantages:
1. the eddy current vibration damper suitable for the wind power blade is convenient to connect, and simple to operate and convenient to construct, and the upper fixing support and the lower fixing support are welded after all parts are assembled in sequence on the basis of the shielding shell;
2. the eddy current vibration damper suitable for the wind power blade has excellent vibration damping effect, the eddy current plate is close to the permanent magnet through the outer load, and meanwhile, the permanent magnet is continuously close to or far away from the eddy current plate according to the magnitude of centripetal acceleration, so that the energy consumption is reduced by changing the eddy current damping force and pulling and pressing the shape memory alloy spring;
3. the eddy current vibration damper suitable for the wind power blade has good mechanical property and is easy to realize, the connection of the components designed in the invention adopts welding, steel bar buckles and bolts, which belong to the mature connection mode in the current market, and meanwhile, the R-shaped steel bar pull ring is connected with the wind power blade by adopting epoxy adhesive, so that the influence on the wind power blade is small;
4. the eddy current vibration damper suitable for the wind power blade has small additional influence on the blade, the lower fixed support designed in the invention is connected with the No. 2 shape memory alloy spring, and the upper fixed support is connected with the small viscous liquid damper, so that new vibration generated by the eddy current vibration damper is well controlled, and the influence on the wind power blade is small;
5. the eddy current vibration damper suitable for the wind power blade is compact in design and structure, and reasonably utilizes the limited space and effective bearing capacity in the wind power blade.
Drawings
Fig. 1 is a schematic combination diagram of an eddy current vibration damping device suitable for wind power blades, fig. 2 is a schematic diagram of a small viscous liquid damper required in the eddy current vibration damping device suitable for the wind power blades, fig. 3 is a sectional view of fig. 2 along the axial lead of a piston rod 514, fig. 4 is a schematic combination diagram of the eddy current vibration damping device suitable for the wind power blades after the internal connection and the force transmission device connection are completed, and fig. 5 is a schematic combination diagram of a node 6 of the eddy current vibration damping device suitable for the wind power blades; wherein, 1: r type reinforcing bar pull ring, 2: steel cord, 3: steel bar buckle, 4: number 1 antifriction rubber sleeve, 5: small viscous damper, 6: node 6, 7: shape memory alloy spring No. 2, 8: eddy current damping portion, 9: wind power blade, 10: shape memory alloy spring connector No. 2, 810: u type fixing support No. 1, 811: upper eddy current plate, 812: upper alloy limit ring, 813: lower alloy stop collar, 814: shield case, 815: lower eddy current plate, 816: first No. 1 shape memory alloy spring, 817: solder bump, 818: lower fixed mount, 819: permanent magnet, 820: sliding ball, 821: ball catching groove, 822: upper fixed mount, 823: second No. 1 shape memory alloy spring, 824: number 2 anti-friction rubber transparent sleeve, 825: screw No. 1, 826: nut No. 1, 511: spherical bearing No. 1, 512: terminal horseshoe, 513: cylinder, 514: piston rod, 515: spherical bearing No. 2, 516: no. 2 nut, 517: u type 2 fixing support, 518: a base plate, 519: screw No. 2, 520: head seal, 521: silicone oil, 522: piston head, 523: and an oil hole.
Detailed Description
As shown in fig. 1 to 5, the invention relates to an eddy current vibration damping device and an installation method for a wind power blade, the eddy current vibration damping device for the wind power blade comprises an eddy current plate, an alloy limiting ring, a shape memory alloy spring, a permanent magnet 819, a fixed support, a shielding shell 814 and a No. 2 antifriction rubber transparent sleeve 824, wherein the shielding shell 814 is cylindrical, the permanent magnet 819 is cylindrical, a circular through hole is arranged at the center of the cylindrical permanent magnet 819, the alloy limiting ring comprises an upper alloy limiting ring 812 and a lower alloy limiting ring 813, and the upper alloy limiting ring 812 and the lower alloy limiting ring 813 are welded on the inner side of the shielding shell 814; the electric vortex plate comprises an upper electric vortex plate 811 and a lower electric vortex plate 815, and a circular through hole is formed in the center of the upper electric vortex plate 811; the shape memory alloy spring comprises a first No. 1 shape memory alloy spring 816, a second No. 1 shape memory alloy spring 823 and a No. 2 shape memory alloy spring 7; the fixed support comprises an upper fixed support 822 and a lower fixed support 818 which are respectively welded at two ends of a shielding shell 814, wherein a circular through hole is arranged at the central position of the upper fixed support 822, an upper eddy current plate 811 and the upper fixed support 822 are welded by a second No. 1 shape memory alloy spring 823, the outer side of the lower fixed support 818 is connected with the inner surface of the wind power blade by 4 No. 2 shape memory alloy springs 7, a lower eddy current plate 815 and the inner side of the lower fixed support 818 are welded by a first No. 1 shape memory alloy spring 816, one end of a steel cable 2 is welded at the center of the other side of the lower eddy current plate 815, one side of the steel cable 2 matched with a No. 2 antifriction rubber transparent sleeve 824 passes through a lower alloy limiting ring 813, a permanent magnet 819, an upper alloy limiting ring 812, the upper eddy current plate 811, the first No. 1 shape memory alloy spring 816 and the upper fixed support 822 to be connected with the blade, the assembly of the whole damping device is formed.
As shown in fig. 1, the upper fixing support 822 is provided with a U-shaped fixing support 810 of No. 1 and is provided with a screw 825 of No. 1 and a nut 826 of No. 1.
As shown in fig. 1, 4 and 5, the lower fixing support 818 is provided with a welding block 817 at the end thereof, and 4 No. 2 shape memory alloy springs 7 are welded thereto.
As shown in fig. 1, 4 rows of ball slots 821 are uniformly welded on the inner wall of the shielding case 814, and the sliding balls 820 are fully installed, added with lubricating oil and sealed.
Under external action, the permanent magnets 819 and the two eddy current plates can slide on the 4 rows of sliding balls 820 along the shield case 814 at the locations defined by the upper alloy retaining ring 812 and the lower alloy retaining ring 813, as shown in fig. 1.
As shown in fig. 1, when there is no external action, the permanent magnet 819, the upper eddy current plate 811 and the lower eddy current plate 815 are in a relatively stable state.
The invention discloses an installation method of an eddy current vibration damper suitable for a wind power blade, which comprises the following steps: as shown in figures 1-5, the first and second parts,
step 1: based on the shielding case 814, sliding balls 820 are loaded into ball clamping grooves 821 on the inner wall of the shielding case 814, and after lubricating oil is filled, two ends of the clamping grooves are sealed; welding an upper alloy limit ring 812 at a corresponding position, and welding a lower alloy limit ring 813 at a corresponding position after a permanent magnet 819 is arranged;
step 2: welding one end of a first No. 1 shape memory alloy spring 816 on the inner surface of the lower fixing support 818, welding the other end of the first No. 1 shape memory alloy spring on one side of a lower eddy current plate 815, and welding one end of a steel cable 2 on the other side of the lower eddy current plate 815;
and step 3: welding one end of a second No. 1 shape memory alloy spring 823 on the inner surface of the upper fixed support 822, and welding the other end of the second No. 1 shape memory alloy spring on one side of the eddy current plate 811;
and 4, step 4: after the other end of the connected steel cable 2 is matched with a No. 2 antifriction rubber transparent sleeve 824 to sequentially pass through a lower alloy limiting ring 813, a permanent magnet 819, an upper alloy limiting ring 812, an upper eddy current plate 811, a second No. 1 shape memory alloy spring 823 and an upper fixing support 822, matching a No. 1 antifriction rubber sleeve 4 at the end of the steel cable 2 to pass through an R-shaped steel bar pull ring 1, and firmly anchoring the steel cable by using a steel bar buckle 3;
and 5: welding the connected upper fixing support 822 and lower fixing support 818 with the two ends of the shielding shell 814 respectively;
step 6: adhering the R-shaped steel bar pull ring 1 connected to the steel cable 2 to the inner surface of the blade tip of the wind power blade 9 by using an epoxy adhesive;
and 7: 4 pieces of No. 2 shape memory alloy springs 7 are welded on a bottom welding block 817 of an installed lower fixed support 818, the other ends of the No. 2 shape memory alloy springs 7 are respectively matched with No. 2 shape memory alloy spring connectors 10 to be connected with an R-shaped steel bar pull ring 1, the R-shaped steel bar pull ring 1 is firmly anchored by using a steel bar buckle 3, and after the No. 2 shape memory alloy springs 7 are tensioned, the 4 pieces of R-shaped steel bar pull rings 1 are adhered to the inner surface 9 of the middle part of the wind power blade by using epoxy adhesive;
and 8: and the lower end of the selected small viscous damper 5 is connected with a No. 2U-shaped fixed support 157 through a No. 2 screw 519 and a No. 2 nut 516, the bottom plate 518 of the No. 2U-shaped fixed support 157 is adhered to the inner surface of the wind power blade 9 through epoxy adhesive, and the upper end of the small viscous damper is connected with a No. 1U-shaped fixed support 810 reserved on the upper fixed support 822 through a No. 1 screw 825 and a No. 1 nut 826, so that the whole damping device is assembled.
The invention provides an eddy current vibration damper suitable for a wind power blade, which comprises an upper eddy current plate, a lower eddy current plate, a shape memory alloy spring, a permanent magnet, a steel cable, an upper fixing support, a lower fixing support and a shielding shell. The upper eddy current plate and the lower eddy current plate are respectively welded on one side of the upper fixing support and the lower fixing support through the shape memory alloy springs, the permanent magnet is a cylinder, the steel cable is sleeved with the steel cable through a circular through hole and can freely slide along the steel cable, one end of the steel cable sequentially penetrates through the upper fixing support, the upper eddy current plate and the permanent magnet and is welded on the upper surface of the lower eddy current plate, the other end of the steel cable is connected with the blade tip of the blade through an R-shaped steel bar pull ring, the vibration of the blade tip drives the lower eddy current plate to be close to the permanent magnet through the steel cable, and the centripetal force of the permanent magnet is changed along with the increase and decrease of the rotation speed of the wind-powered blade, so that the upper eddy current plate and the lower eddy.
In order to further enhance the sliding of the permanent magnet and the upper and lower eddy current plates in the eddy current vibration damper, 4 rows of sliding steel balls are arranged on the inner wall of the shielding shell. In order to limit the permanent magnet and the eddy current plate to generate overlarge movement and cause that the shape memory alloy spring is too deformed to recover, two alloy limiting rings are welded on the shielding shell between the permanent magnet and the eddy current plate. In order to reduce the adverse effect of the vibration of the eddy current damping part in the wind power blade, a U-shaped support is used for fixing a small viscous liquid damper between the upper fixing support and the inner surface of the wind power blade, the small viscous liquid damper is widely applied to various large vibration reduction structures at present, 4 shape memory alloy springs are welded on the lower fixing support, and the R-shaped steel bar pull rings are respectively fixed on the inner surface of the blade along four directions. In order to reduce the damage of stress concentration at the connecting node of the inner surface of the blade to the blade and prolong the service life of the wind generating set, the R-shaped steel bar ring fastener and the No. 2U-shaped fixed support of the small viscous liquid damper are firmly connected with the inner surface of the blade by using an epoxy resin adhesive. The various accessory components are firmly connected with the inner wall of the blade to form a whole with the blade, so that the eddy current vibration damper suitable for the wind power blade is constructed.
As shown in fig. 1, the eddy current damping device suitable for the wind power blade of the present invention includes a steel cable 2, an upper eddy current plate 811, an upper alloy limiting ring 812, a lower alloy limiting ring 813, a shielding shell 814, a lower eddy current plate 815, a first shape memory alloy spring 816, a lower fixing support 818, a permanent magnet 819, an upper fixing support 822, and a second shape memory alloy spring 823. 4 rows of sliding ball clamping grooves 821 are formed in the inner surface of the shielding shell 814 and filled with sliding balls 820; the alloy limiting ring comprises an upper alloy limiting ring 812 and a lower alloy limiting ring 813, the upper alloy limiting ring 812 and the lower alloy limiting ring 813 are welded on the inner wall of the shielding shell 814, and a permanent magnet 819 is arranged between the upper alloy limiting ring 812 and the lower alloy limiting ring 813; an upper fixed support 822 and an upper eddy current plate 811 are respectively welded at two ends of a first No. 1 shape memory alloy spring 816, a lower fixed support 818 and a lower eddy current plate 815 are respectively welded at two ends of a second No. 1 shape memory alloy spring 823, a steel cable 2 is welded at the other side of the lower eddy current plate 815, the connected steel cable 2 is matched with a No. 2 antifriction rubber transparent lasso 824 to sequentially penetrate through a lower alloy limiting ring 813, a permanent magnet 819, an upper alloy limiting ring 812, the upper eddy current plate 811, the second No. 1 shape memory alloy spring 823 and the upper fixed support 822, then the lower fixed support 818 and the upper fixed support 822 are welded at two ends of a shielding shell 814, and the assembly of a damping part of the eddy current vibration damper is completed.
As shown in figure 4, the invention combines the eddy current damping part 8, the 4 No. 2 shape memory alloy springs 7, the small viscous liquid damper 5, the R-shaped steel bar pull ring 1 and other components to be connected with the wind power blade 9 to form a vibration damping device which jointly resists the external action and achieves the vibration damping purpose. The adopted small viscous liquid damper 5 is widely used in various large structures of buildings, and the structure is shown in fig. 2; after one end of a steel cable 2 is matched with a No. 1 antifriction rubber sleeve 4 and fixed on an R-shaped steel bar pull ring 1 by a steel bar buckle 3, the R-shaped steel bar pull ring 1 is adhered on the corresponding inner surface of the blade tip of a wind power blade 9 by using an epoxy adhesive, as shown in figures 1 to 5, meanwhile, an upper fixed support 822 is provided with a No. 1U-shaped fixed support 810, a lower fixed support 818 is provided with a welding block 817, the No. 1U-shaped fixed support 810 is connected with a No. 1 spherical bearing 511 of a small viscous liquid damper 5 through a No. 1U-shaped fixed support 825 and a No. 1 nut 826, the other end of the small viscous liquid damper 5 is connected with a No. 2 spherical bearing 515 through a No. 2U-shaped fixed support 157 through a No. 2 screw 519 and a No. 2 nut 516, a bottom plate 518 of the No. 2U-shaped fixed support 157 is adhered on the inner surface of the wind power, the other ends of the 4 No. 2 shape memory alloy springs are respectively matched with the No. 2 shape memory alloy spring connecting pieces 10 to be fixed on the 4R-shaped steel bar pull rings 1 through steel bar buckles 3, and the 4R-shaped steel bar pull rings 1 are respectively bonded on the corresponding inner surfaces of the wind power blades 9 through epoxy adhesives, so that the parts are fixed on the inner surfaces of the wind power blades 9 after being mutually firmly connected, and the parts and the blades form a vibration damping device.
The lower eddy current plate 815 is driven to be close to the permanent magnet 819 through blade tip vibration, and meanwhile, the centripetal force of the permanent magnet 819 is changed along with the increase and decrease of the rotating speed of the wind power blade, so that the lower eddy current plate 811 and the lower eddy current plate 815 are close to or far away from the upper eddy current plate and the lower eddy current plate along the steel cable 2, and therefore the vibration is reduced through changing the eddy current damping force and the energy consumed by drawing and pressing the shape memory alloy spring.
The invention designs the eddy current vibration damper suitable for the wind power blade by utilizing the principle of eddy current, the steel cable is connected at the blade tip of the wind power blade, all parts are firmly adhered to the inner surface of the blade by epoxy adhesive, and the eddy current damping part and the blade are connected into a new whole by the small viscous liquid damper and the shape memory alloy spring to form the new vibration damper. The eddy current plate is driven to be close to the permanent magnet through the steel cable by the vibration of the blade tip, and the centripetal force of the permanent magnet is changed along with the increase and decrease of the rotation speed of the wind-power blade, so that the eddy current plate is close to or far away from the steel cable, the vibration of the blade is reduced by changing the eddy current damping force and the energy consumed by pulling and pressing the shape memory alloy spring, the structure is simple, the force transmission path is clear, the design and calculation are convenient, and the construction process is simple.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. Be suitable for wind-powered electricity generation blade's eddy current vibration damper, including the eddy current board, the alloy spacing ring, shape memory alloy spring, permanent magnet (819), fixing support, shield shell (814) and No. 2 antifriction rubber transparent sleeve (824), its characterized in that: the shielding shell (814) is cylindrical, the permanent magnet (819) is cylindrical, a circular through hole is formed in the center of the cylindrical permanent magnet, the alloy limiting ring comprises an upper alloy limiting ring (812) and a lower alloy limiting ring (813), the upper alloy limiting ring (812) and the lower alloy limiting ring (813) are welded on the inner side of the shielding shell (814), the eddy current plate comprises an upper eddy current plate (811) and a lower eddy current plate (815), the circular through hole is formed in the center of the upper eddy current plate (811), and the shape memory alloy spring comprises a first shape memory alloy spring No. 1 (816), a second shape memory alloy spring No. 1 (823) and a shape memory alloy spring No. 2 (7); the fixed support comprises an upper fixed support (822) and a lower fixed support (818), the upper fixed support (822) and the lower fixed support (818) are respectively welded at two ends of a shielding shell (814), a circular through hole is formed in the center of the upper fixed support (822), the upper eddy current plate (811) and the upper fixed support (822) are welded by a second No. 1 shape memory alloy spring (823), the outer side of the lower fixed support (818) is connected with the inner surface of a wind power blade by 4 No. 2 shape memory alloy springs (7), the lower eddy current plate (815) and the inner side of the lower fixed support (818) are welded by a first No. 1 shape memory alloy spring (816), one end of a steel cable (2) is welded at the center of the other side of the lower eddy current plate (815), and one side of the steel cable (2) matched with a No. 2 antifriction rubber transparent sleeve (824) penetrates through a lower alloy limiting ring (813), a permanent magnet (819), an upper alloy limiting ring, The upper eddy current plate (811), the first No. 1 shape memory alloy spring (816) and the upper fixed support (822) are connected with the blade tip of the wind power blade (9), and the whole damping device is assembled.
2. The eddy current damping device for a wind turbine blade according to claim 1, wherein: the upper fixing support (822) is provided with a No. 1U-shaped fixing support (810) and is provided with a corresponding No. 1 screw (825) and a No. 1 screw cap (826).
3. The eddy current damping device for a wind turbine blade according to claim 1, wherein: the tail end of the lower fixed support (818) is provided with a welding block (817) for welding 4 No. 2 shape memory alloy springs (7).
4. The eddy current damping device for a wind turbine blade according to claim 1, wherein: 4 rows of ball clamping grooves (821) are uniformly welded on the inner wall of the shielding shell (814), and lubricating oil is added and sealed after the sliding balls (820) are fully installed.
5. The eddy current damping device for a wind turbine blade according to claim 1, wherein: under the external action, the permanent magnet (819), the upper eddy current plate (811) and the lower eddy current plate (815) can slide on the 4 rows of sliding balls (820) along the inner wall of the shielding shell (814) at the positions limited by the upper alloy limiting ring (812) and the lower alloy limiting ring (813).
6. The eddy current damping device for a wind turbine blade according to claim 1, wherein: when no external action is exerted, the permanent magnet (819), the upper eddy current plate (811) and the lower eddy current plate (815) are in a relatively stable state.
7. The eddy current damping device for the wind power blade as claimed in claim 1, wherein the method for mounting the eddy current damping device for the wind power blade comprises the steps of:
step 1: based on the shielding shell (814), sliding balls (820) are filled in ball clamping grooves (821) in the inner wall of the shielding shell (814), lubricating oil is filled in the ball clamping grooves, two ends of each clamping groove are sealed, alloy limiting rings (812) are welded at corresponding positions, permanent magnets (819) are filled in the ball clamping grooves, and then lower alloy limiting rings (813) are welded at corresponding positions;
step 2: welding one end of a first No. 1 shape memory alloy spring (816) on the inner surface of the lower fixed support (818), welding the other end of the first No. 1 shape memory alloy spring on one side of a lower eddy current plate (815), and welding one end of a steel cable (2) on the other side of the lower eddy current plate (815);
and step 3: welding one end of a second No. 1 shape memory alloy spring (823) on the inner surface of the upper fixed support (822), and welding the other end of the second No. 1 shape memory alloy spring on one side of the upper eddy current plate (811);
and 4, step 4: after the other end of the connected steel cable (2) is matched with a No. 2 antifriction rubber transparent sleeve (824) to sequentially penetrate through a lower alloy limiting ring (813), a permanent magnet (819), an upper alloy limiting ring (812), an upper eddy current plate (811), a second No. 1 shape memory alloy spring (823) and an upper fixed support (822), the end of the steel cable (2) is matched with a No. 1 antifriction rubber sleeve (4) to penetrate through an R-shaped steel bar pull ring (1), and the steel bar is firmly anchored by a steel bar buckle (3);
and 5: welding the connected upper fixed support (822) and lower fixed support (818) with two ends of the shielding shell (814) respectively;
step 6: adhering the R-shaped steel bar pull ring (1) connected to the steel cable (2) to the inner surface of the blade tip of the wind power blade (9) by using an epoxy adhesive;
and 7: welding 4 No. 2 shape memory alloy springs (7) on a bottom welding block (817) of an installed lower fixed support (818), respectively matching with a No. 2 shape memory alloy spring connecting piece (10) at the other end of the No. 2 shape memory alloy spring (7) to connect an R-shaped steel bar pull ring (1), firmly anchoring by using a steel bar buckle (3), tensioning the No. 2 shape memory alloy spring (7), and adhering the 4R-shaped steel bar pull rings (1) to the inner surface of the middle part of a wind power blade (9) by using epoxy adhesive;
and 8: the lower end of the selected small viscous damper (5) is connected with a No. 2U-shaped fixed support (517) through a No. 2 screw rod (519) and a No. 2 nut (516), a bottom plate (518) of the No. 2U-shaped fixed support (517) is adhered to the inner surface of the wind power blade (9) through epoxy adhesive, the upper end of the small viscous damper is connected with a No. 1U-shaped fixed support (810) reserved in an upper fixed support (822) through a No. 1 screw rod (825) and a No. 1 nut (826), and the whole damping device is assembled.
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| CN201811127092.4A CN109114159B (en) | 2018-09-27 | 2018-09-27 | Eddy current vibration damper suitable for wind power blade and mounting method |
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| CN110043426A (en) * | 2019-05-28 | 2019-07-23 | 湖南大学 | For inhibiting the passive type eddy current damper of blade of wind-driven generator flutter unstability |
| CN113803394A (en) * | 2021-09-16 | 2021-12-17 | 北京航空航天大学 | Isolator based on eddy current effect and method |
| CN114263658B (en) * | 2021-12-23 | 2024-01-16 | 西南石油大学 | Vortex-induced vibration suppression device and method combining magnetic sliding and diversion rotation |
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| CN2737980Y (en) * | 2004-09-30 | 2005-11-02 | 中航（保定）惠腾风电设备有限公司 | Structural damper for wind wheel blades |
| EP2458150A1 (en) * | 2010-11-24 | 2012-05-30 | Alstom Technology Ltd | Method for damping mechanical vibrations occurring during operation in a turbomachine blade, turbomachine blade for carrying out the method and piezoelectric damping element to be installed in such a turbomachine blade |
| CN103233997A (en) * | 2013-05-23 | 2013-08-07 | 湖南大学 | Double-layer circular-tube type axial-force eddy current damper |
| CN103410684A (en) * | 2013-08-26 | 2013-11-27 | 温州大学 | Wind turbine blade vibration damping method and device |
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| CN2737980Y (en) * | 2004-09-30 | 2005-11-02 | 中航（保定）惠腾风电设备有限公司 | Structural damper for wind wheel blades |
| EP2458150A1 (en) * | 2010-11-24 | 2012-05-30 | Alstom Technology Ltd | Method for damping mechanical vibrations occurring during operation in a turbomachine blade, turbomachine blade for carrying out the method and piezoelectric damping element to be installed in such a turbomachine blade |
| CN103233997A (en) * | 2013-05-23 | 2013-08-07 | 湖南大学 | Double-layer circular-tube type axial-force eddy current damper |
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