CN109306941A - A kind of viscous fluid dissipative damping device for pneumatic equipment bladess - Google Patents
A kind of viscous fluid dissipative damping device for pneumatic equipment bladess Download PDFInfo
- Publication number
- CN109306941A CN109306941A CN201811120577.0A CN201811120577A CN109306941A CN 109306941 A CN109306941 A CN 109306941A CN 201811120577 A CN201811120577 A CN 201811120577A CN 109306941 A CN109306941 A CN 109306941A
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- CN
- China
- Prior art keywords
- pneumatic equipment
- equipment bladess
- viscous fluid
- outer sleeve
- damping device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
- F05B2260/964—Preventing, counteracting or reducing vibration or noise by damping means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a kind of viscous fluid dissipative damping devices for pneumatic equipment bladess, including outer sleeve, twice baffle is provided in outer sleeve, the inner cavity of outer sleeve is divided into the left transition chamber thereof for successively sealing cooperation by baffle, recreation room and right transition chamber thereof, viscous damping fluid liquid is filled in recreation room, pull rod penetrates in outer sleeve, connector is fixedly connected with the blade tip of pneumatic equipment bladess, piston bush is fixed on pull rod, and piston is located in recreation room, the outer surface of piston is slidably matched with outer sleeve inner surface sealing, at least one damping hole is provided on piston, two cavitys sealed against each other of damping hole connection recreation room.The present invention is used for pneumatic equipment bladess, can reduce the significantly deformation of flexible blade under the premise of not changing blade aerodynamic shape; vibration damage is protected the blade from, is reduced costs simultaneously, ensure that working efficiency; and structure is simple, installation is reliable, therefore has certain feasibility.
Description
Technical field
The invention belongs to the technical fields of wind energy conversion system design and application, are related to a kind of wind energy conversion system equipment for inhibiting of vibration, specifically
Say, be a kind of viscous fluid dissipative damping device for pneumatic equipment bladess.
Background technique
Wind energy is a kind of clean reproducible energy, has vast potential for future development.Wind energy conversion system is just towards enlargement in recent years
Direction is developed, and the length of blade of wind energy conversion system is up to hundred meters of magnitudes, while wind wheel mounting height is also significantly increased.With pneumatic equipment bladess
Structure develops towards big flexibility direction, and vibration natural frequency gradually decreases, and compared with small wind turbine, blade is easier to produce
Raw significantly bending deformation.In addition, the growth of wind shear in boundary layer exponentially form, with the increase of wind wheel height,
Pneumatic equipment bladess are in the bigger working environment of wind speed difference, are needed in face of more complicated incoming flow.On the other hand, large scale wind
Power machine is typically mounted at coastal or marine, these regions frequently encounter the invasion of strong gusts of wind and typhoon, in extreme weather conditions
Strong violent oscillatory motion even flutter unstability damage easily occurs for apparatus for lower wind machine blade.Therefore, large scale wind power machine blade is big
Amplitude vibrations increasingly become the problem of can not be ignored.
In order to solve the problems, such as the substantially vibration deformation of pneumatic equipment bladess, existing method is to increase blade in blade laying
Thickness of composite material is to promote the rigidity of blade, but this method will increase the weight of blade, to improve the system of wind energy conversion system
It makes and installation cost.In configuration design, in order to guarantee that, there are safe distance between blade and pylon, current vane all uses pre-
Curved design, for the 6MW wind energy conversion system of 100 meters of magnitudes, the clearance of blade tip pre-bending can be up to as many as 4 meters, but this way exists
The aerodynamic characteristic of blade is changed to a certain extent, and then reduces the generated output output of wind energy conversion system, seriously affects wind-power electricity generation
Economy.On operation reserve, pitch control is carried out to reduce wind load, although this way can mitigate to pneumatic equipment bladess
Vibration, but the front face area of pneumatic equipment bladess reduces, and generating efficiency also decreases, while facing extreme fitful wind and moment
Change of the wind when, the pitch-controlled system of blade has little time to make a response, and blade not can avoid extreme loads in this case and make
At violent oscillatory motion.Currently, increase system and device in blade tip to reduce maximum distortion and the vibration of blade, there are no ground
Study carefully and realizes.
Therefore in view of the above-mentioned problems, the design proposes a kind of viscous fluid passive energy dissipation dress for pneumatic equipment bladess
It sets.The device is alleviated the vibration problem of pneumatic equipment bladess, is reduced simultaneously under the premise of not changing the pneumatic efficiency of pneumatic equipment bladess
Manufacturing cost, structure is simple, will there is wide market application prospect.
Summary of the invention
The technical problem to be solved by the present invention is to be directed to above-mentioned state of the art, propose that structure is simple, installation is stablized
Reliably, the Maintenance free and service life can match with pneumatic equipment bladess working life, and it is suitable for what various specifications wind energy conversion system used
A kind of pneumatic equipment bladess dissipative damping device, while can reduce leaf weight, improve blade aerodynamic working efficiency.
To realize the above-mentioned technical purpose, the technical scheme adopted by the invention is as follows:
A kind of viscous fluid dissipative damping device for pneumatic equipment bladess, viscous fluid dissipative damping device are mounted on wind energy conversion system
In blade, viscous fluid dissipative damping device includes outer sleeve, and the right end of outer sleeve deviates from the blade tip and and wind of pneumatic equipment bladess
Power machine blade interior is fixedly connected, and twice baffle is provided in outer sleeve, and the inner cavity of outer sleeve is divided by baffle successively to be sealed
Left transition chamber thereof, recreation room and the right transition chamber thereof of cooperation, recreation room is interior to be filled with viscous damping fluid liquid, viscous fluid consumption
Can vibration absorber further include Tiebar structure, Tiebar structure by pull rod, piston, spring and connector, pull rod left end through spring with connect
Head connection, pull rod penetrate in outer sleeve, and can control and pull, and connector is located at outer sleeve left hand external, connector and pneumatic equipment bladess
Blade tip be fixedly connected, piston bush is fixed on pull rod, and piston is located in recreation room, and the activity interior space is divided into two
The cavity sealed against each other, outer surface and the outer sleeve inner surface sealing of piston are slidably matched, at least one resistance is provided on piston
Buddhist nun hole, damping hole are connected to two cavitys sealed against each other of recreation room.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
Above-mentioned pull rod is fixed with sealing element on baffle, sealing element covers on pull rod also cross the twice baffle in outer sleeve
It is slidably matched with pull rod, the gap between sealing element sealing baffle and pull rod.
Above-mentioned outer sleeve right end seals right transition chamber thereof by closeouts, right fixing threaded hole is provided in closeouts, outside
Sleeve realizes the fixation with pneumatic equipment bladess by bolt also cross the corresponding screw hole of right fixing threaded hole and pneumatic equipment bladess.
Left fixing threaded hole is provided on above-mentioned connector, connector is by bolt also cross left fixing threaded hole and wind energy conversion system
Corresponding screw hole at blade tip realizes the fixation with pneumatic equipment bladess.
Be provided with girder, lower girder, leading web and trailing web in above-mentioned pneumatic equipment bladess, the upper end of leading web with it is upper
Girder front is fixedly connected, and lower end is fixedly connected with lower girder front, and trailing web upper end is fixedly connected with upper girder rear portion, lower end
It being fixedly connected with lower girder rear portion, upper girder, lower girder, leading web and trailing web have collectively constituted the skeleton of pneumatic equipment bladess,
Viscous fluid dissipative damping device is mounted in the middle part of the skeleton of pneumatic equipment bladess in gap, and viscous fluid dissipative damping device passes through
Strut is fixedly connected with the skeleton of pneumatic equipment bladess.
Above-mentioned outer sleeve left end is the 5% ± 1% of entire length of blade at a distance from pneumatic equipment bladess blade tip.
Above-mentioned connector is spade tip, and the solid section of connector insertion pneumatic equipment bladess is fixed.
Above-mentioned viscous damping fluid liquid is methyl-silicone oil.
Above-mentioned spring overcoat has spring protecting jacket.
Viscous fluid dissipative damping device for pneumatic equipment bladess of the invention is by spring and pull rod, piston and damping
Hole, recreation room, viscous fluid, outer sleeve, high-intensity sealing part and strut composition；According to passive energy dissipation principle, pneumatic equipment bladess
Generation is when waving the bending deformation in direction, and tip band spring pull rod of moving is flexible, the indoor piston motion of spring pull rod drive activity,
Recreation room is provided with viscous fluid, and the viscous fluid that piston motion forces flows through damping hole, generates viscosity resistance, consumes the vibration of blade
Energy.The selection of the damper rod material and viscid fluent material, ensure that under its working life and working environment
Safety, damper is mounted on gap between blade girder and web, ensure that the feasibility of the invention.
Compared with the way for improving blade stiffness to mitigate blade vibration to increase leaf weight at present, the present invention is only mentioned
For additional damping, additional stiffness is not provided, reduces the cost of blade, and does not change the natural vibration period of blade, it will not be in blade
Extra normal force is provided when moment of flexure maximum, does not change the aeroperformance of blade, ensure that the working efficiency of wind energy conversion system.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is left view cross-sectional view when the device of the invention is mounted in pneumatic equipment bladess；
Fig. 3 is left end structural schematic diagram of the invention.
Wherein appended drawing reference are as follows: pneumatic equipment bladess 1, upper girder 11, lower girder 12, leading web 13, trailing web 14, strut
15, viscous fluid dissipative damping device 2, outer sleeve 21, baffle 22, left transition chamber thereof 23, recreation room 24, right transition chamber thereof 25,
Sealing element 26, closeouts 27, right fixing threaded hole 28, Tiebar structure 3, pull rod 31, piston 32, damping hole 32a, spring 33, spring
Protective case 33a, connector 34, left fixing threaded hole 35.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
The present invention is a kind of viscous fluid dissipative damping device for pneumatic equipment bladess, viscous fluid dissipative damping device
2 are mounted in pneumatic equipment bladess 1, and viscous fluid dissipative damping device 2 includes outer sleeve 21, and the right end of outer sleeve 21 deviates from wind-force
The blade tip of machine blade 1 and be fixedly connected inside pneumatic equipment bladess 1, be provided with twice baffle 22 in outer sleeve 21, baffle 22 will
The inner cavity of outer sleeve 21 is divided into the left transition chamber thereof 23, recreation room 24 and right transition chamber thereof 25 for successively sealing cooperation, activity
Viscous damping fluid liquid is filled in room 24, viscous fluid dissipative damping device 2 further includes Tiebar structure 3, and Tiebar structure 3 is by drawing
Bar 31, piston 32, spring 33 and connector 34,31 left end of pull rod are connect through spring 33 with connector 34, and pull rod 31 penetrates outer sleeve
In 21, and can left and right pull, connector 34 is located at 21 left hand external of outer sleeve, the fixed company of the blade tip of connector 34 and pneumatic equipment bladess 1
It connects, 32 sets of piston fixed on pull rod 31, and piston 32 is located in recreation room 24, and space in recreation room 24 is divided into two phases
The cavity mutually sealed, outer surface and the sealing of 21 inner surface of outer sleeve of piston 32 are slidably matched, and at least one is provided on piston 32
Two cavitys sealed against each other of a damping hole 32a, damping hole 32a connection recreation room 24.
In embodiment, pull rod 31 is fixed with sealing element 26 on baffle 22 also cross the twice baffle 22 in outer sleeve 21,
26 sets of sealing element are slidably matched on pull rod 31 with pull rod 31, the gap between 26 sealing baffle 22 of sealing element and pull rod 31.
In embodiment, 21 right end of outer sleeve seals right transition chamber thereof 25 by closeouts 27, is provided with the right side in closeouts 27
Fixing threaded hole 28, outer sleeve 21 are realized by bolt also cross the corresponding screw hole of right fixing threaded hole 28 and pneumatic equipment bladess 1
With the fixation of pneumatic equipment bladess 1.
In embodiment, left fixing threaded hole 35 is provided on connector 34, connector 34 is by bolt also cross left fixing threaded hole
35 and 1 blade tip of pneumatic equipment bladess at corresponding screw hole realize and the fixations of pneumatic equipment bladess 1.
In embodiment, girder 11, lower girder 12, leading web 13 and trailing web 14, preceding abdomen are provided in pneumatic equipment bladess 1
The upper end of plate 13 is fixedly connected with upper 11 front of girder, and lower end is fixedly connected with 12 front of lower girder, 14 upper end of trailing web with it is upper
11 rear portion of girder is fixedly connected, and lower end is fixedly connected with 12 rear portion of lower girder, upper girder 11, lower girder 12, leading web 13 and after
Web 14 has collectively constituted the skeleton of pneumatic equipment bladess 1, and viscous fluid dissipative damping device 2 is mounted on the bone of pneumatic equipment bladess 1
In the middle part of frame in gap, viscous fluid dissipative damping device 2 is fixedly connected by strut 15 with the skeleton of pneumatic equipment bladess 1.
In embodiment, 21 left end of outer sleeve is the 5% ± 1% of entire length of blade at a distance from 1 blade tip of pneumatic equipment bladess.
In embodiment, connector 34 is spade tip, and the solid section that connector 34 is inserted into pneumatic equipment bladess 1 is fixed.
In embodiment, viscous damping fluid liquid is methyl-silicone oil.
In embodiment, spring protecting jacket 33a is cased with outside spring 33.
Pneumatic equipment bladess are made of composite plys, and positioned inside web and girder respectively undertake the shearing of blade
With wave moment of flexure, girder and web extend near blade tip from blade root, account for 95% or so of entire length of blade.
The working method of present system is: viscous fluid dissipative damping device can select different bodies according to different leaves
Product is mounted on gap between blade interior girder and web, guarantees blade in vibrative bending and deforming process middle girder and web
Outer sleeve 21 will not be expressed to.21 left end of device outer sleeve is about the 5% of entire length of blade at a distance from blade tip.Device
3 left end of Tiebar structure be embedded to blade tip solid section, and be connected and fixed by aperture using screw and blade above and below wind energy conversion system.
Due to Axis Wind Turbine With A Tip Vane segment thickness very little, the part that connector 34 and blade are fixed is designed to flat pattern.Device is most right
End is connected and fixed by strut and girder, fixes apparatus main body in conjunction with bolt, strut both ends and blade girder are affixed.Due to master
Beam and web are simultaneously not extend to blade tip most end, and then 3 left end portion of Tiebar structure selection, 33 extending apparatus of spring is embedded in blade tip
Solid place is fixed, and does not have the place of girder and web protection, the flexible deformation of spring 33 in blade tip in this way, and pull by flexible
Piston 32 ensure that the safety of whole system and the feasibility of drag reduction, and protective case is equipped with outside spring 33 for reducing spring 33
It wears while providing tracks for spring.Viscous fluid is equipped in device recreation room, generally selection methyl-silicone oil.Viscous fluid
By the damping hole on piston under the movement of piston, throttle resistance is generated, to consume on pneumatic equipment bladess since wind load produces
Raw vibrational energy.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (9)
1. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess, it is characterized in that: viscous fluid dissipative damping device
(2) it is mounted in pneumatic equipment bladess (1), the viscous fluid dissipative damping device (2) includes outer sleeve (21), and described is outer
The right end of sleeve (21) deviates from the blade tip of pneumatic equipment bladess (1) and is fixedly connected with pneumatic equipment bladess (1) inside, the housing
It is provided with twice baffle (22) in cylinder (21), the inner cavity of outer sleeve (21) is divided into successively sealing and cooperated by the baffle (22)
Left transition chamber thereof (23), recreation room (24) and right transition chamber thereof (25), viscous flow is filled in the recreation room (24)
Body damping fluid, viscous fluid dissipative damping device (2) further include Tiebar structure (3), and the Tiebar structure (3) is by pull rod
(31), piston (32), spring (33) and connector (34), the pull rod (31) left end connect through spring (33) and connector (34)
It connects, pull rod (31) penetrates in outer sleeve (21), and can control and pull, and connector (34) is located at outer sleeve (21) left hand external, connector
(34) it is fixedly connected with the blade tip of pneumatic equipment bladess (1), piston (32) is covered to be fixed on pull rod (31), and piston (32) is located at work
In dynamic room (24), recreation room (24) interior space is divided into two cavitys sealed against each other, the outer surface of the piston (32)
It is slidably matched with the sealing of outer sleeve (21) inner surface, at least one damping hole (32a), the damping is provided on piston (32)
Hole (32a) is connected to two cavitys sealed against each other of recreation room (24).
2. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 1, it is characterized in that: institute
The pull rod (31) stated is fixed with sealing element on (22) also cross the twice baffle (22) in outer sleeve (21), the baffle
(26), the sealing element (26), which is covered, is slidably matched on pull rod (31) with pull rod (31), the sealing element (26) sealing gear
Gap between plate (22) and pull rod (31).
3. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 2, it is characterized in that: institute
Outer sleeve (21) right end stated seals right transition chamber thereof (25) by closeouts (27), and the closeouts are provided with the right side on (27)
Fixing threaded hole (28), the outer sleeve (21) is by bolt also cross right fixing threaded hole (28) and pneumatic equipment bladess (1)
Corresponding screw hole realize and the fixation of pneumatic equipment bladess (1).
4. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 3, it is characterized in that: institute
It is provided with left fixing threaded hole (35) on the connector (34) stated, the connector (34) is by bolt also cross left fixing threaded hole
(35) the corresponding screw hole and at pneumatic equipment bladess (1) blade tip realizes the fixation with pneumatic equipment bladess (1).
5. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 4, it is characterized in that: institute
It is provided with girder (11), lower girder (12), leading web (13) and trailing web (14) in the pneumatic equipment bladess (1) stated, it is described
The upper end of leading web (13) is fixedly connected with upper girder (11) front, and lower end is fixedly connected with lower girder (12) front, described
Trailing web (14) upper end is fixedly connected with upper girder (11) rear portion, and lower end is fixedly connected with lower girder (12) rear portion, and described is upper
Girder (11), lower girder (12), leading web (13) and trailing web (14) have collectively constituted the skeleton of pneumatic equipment bladess (1), described
Viscous fluid dissipative damping device (2) be mounted in the middle part of the skeletons of pneumatic equipment bladess (1) in gap, the viscous fluid consumption
Energy vibration absorber (2) is fixedly connected by strut (15) with the skeleton of pneumatic equipment bladess (1).
6. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 5, it is characterized in that: institute
Outer sleeve (21) left end stated is the 5% ± 1% of entire length of blade at a distance from pneumatic equipment bladess (1) blade tip.
7. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 6, it is characterized in that: institute
The connector (34) stated is spade tip, and the solid section of the connector (34) insertion pneumatic equipment bladess (1) is fixed.
8. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 7, it is characterized in that: institute
The viscous damping fluid liquid stated is methyl-silicone oil.
9. a kind of viscous fluid dissipative damping device for pneumatic equipment bladess according to claim 8, it is characterized in that: institute
Spring protecting jacket (33a) is cased with outside the spring (33) stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811120577.0A CN109306941A (en) | 2018-09-26 | 2018-09-26 | A kind of viscous fluid dissipative damping device for pneumatic equipment bladess |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811120577.0A CN109306941A (en) | 2018-09-26 | 2018-09-26 | A kind of viscous fluid dissipative damping device for pneumatic equipment bladess |
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| Publication Number | Publication Date |
|---|---|
| CN109306941A true CN109306941A (en) | 2019-02-05 |
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ID=65225187
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811120577.0A Pending CN109306941A (en) | 2018-09-26 | 2018-09-26 | A kind of viscous fluid dissipative damping device for pneumatic equipment bladess |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320194A (en) * | 1998-07-28 | 2001-10-31 | 尼格麦康有限公司 | Wind turbine blade with U-shaped oscillation damping means |
| US20110182730A1 (en) * | 2010-07-27 | 2011-07-28 | Vestas Wind Systems A/S | Wind turbine blade with damping element for edgewise vibrations |
| DE102012216804A1 (en) * | 2012-09-19 | 2014-03-20 | Repower Systems Se | Damping system and rotor blade |
| EP2840256A1 (en) * | 2013-08-19 | 2015-02-25 | Alstom Renovables España, S.L. | Wind turbine blade |
| CN104595408A (en) * | 2015-01-30 | 2015-05-06 | 柳州市同进汽车零部件制造有限公司 | Shock absorption device of automobile |
| DE102013112818A1 (en) * | 2013-11-20 | 2015-05-21 | Hahn-Gasfedern Gmbh | spring element |
-
2018
- 2018-09-26 CN CN201811120577.0A patent/CN109306941A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320194A (en) * | 1998-07-28 | 2001-10-31 | 尼格麦康有限公司 | Wind turbine blade with U-shaped oscillation damping means |
| US20110182730A1 (en) * | 2010-07-27 | 2011-07-28 | Vestas Wind Systems A/S | Wind turbine blade with damping element for edgewise vibrations |
| DE102012216804A1 (en) * | 2012-09-19 | 2014-03-20 | Repower Systems Se | Damping system and rotor blade |
| EP2840256A1 (en) * | 2013-08-19 | 2015-02-25 | Alstom Renovables España, S.L. | Wind turbine blade |
| DE102013112818A1 (en) * | 2013-11-20 | 2015-05-21 | Hahn-Gasfedern Gmbh | spring element |
| CN104595408A (en) * | 2015-01-30 | 2015-05-06 | 柳州市同进汽车零部件制造有限公司 | Shock absorption device of automobile |
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Application publication date: 20190205 |