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EP0835380A1 - Procede et dispositif pour diminuer les vibrations dans une pale d'eolienne - Google Patents

Procede et dispositif pour diminuer les vibrations dans une pale d'eolienne

Info

Publication number
EP0835380A1
EP0835380A1 EP96921911A EP96921911A EP0835380A1 EP 0835380 A1 EP0835380 A1 EP 0835380A1 EP 96921911 A EP96921911 A EP 96921911A EP 96921911 A EP96921911 A EP 96921911A EP 0835380 A1 EP0835380 A1 EP 0835380A1
Authority
EP
European Patent Office
Prior art keywords
blade
mass
cylinder
lift
lever system
Prior art date
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.)
Withdrawn
Application number
EP96921911A
Other languages
German (de)
English (en)
Inventor
Peder Bay Enevoldsen
Henrik Stiesdal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Gamesa Renewable Energy AS
Original Assignee
Bonus Energy AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bonus Energy AS filed Critical Bonus Energy AS
Publication of EP0835380A1 publication Critical patent/EP0835380A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0675—Rotors characterised by their construction elements of the blades
    • 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
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/305—Flaps, slats or spoilers
    • F05B2240/3052—Flaps, slats or spoilers adjustable
    • 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
    • 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

Definitions

  • the invention relates to a method for reduction of vibra ⁇ tions in a windmill blade so that the loads on the blade and on the remaining part of the mill structure are re ⁇ cuted.
  • the invention also relates to a device for use in carrying out the method.
  • the lift properties of a given blade profile may be changed in various manners. Lowering of a flap close to the rear edge of the profile, lifting a slot above the leading edge of the blade and placing of vortex generators on the suction side of the blade will normally increase the lift of the profile. Presence of a turbulator close to the leading edge of the blade or opening of channels for air flow across the pro ⁇ file will normally reduce the lift of the profile.
  • the lift properties of the entire blade may be changed by adjusting the pitch angle of the blade.
  • This object is achieved by a method of the kind described in the introduction, said method according to the invention being characteristic in that the aerodynamic properties of the blade are changed as a function of the acceleration and/or speed in the direction of rotation and/or out of the rotor plane of a slideable device.
  • the superior principle of the invention is to provide a simple, direct connection between the acceleration and/or speed of the outer part of the blade and the aerodynamic properties of the blade. In a particularly advantageous manner this will reduce any vibrations.
  • the basis of the invention is the fact that the accelera ⁇ tion and/or speed of the outer part of a windmill blade is a good indication of how the loads will develop by structural vibrations. As opposed to a measurement of the size of the loads, where the maximum signal is not obtained till the occurrence of the situation itself, which is to be avoided, a measurement of the acceleration and/or speed will provide the maximum signal already at the time when a vibration starts to develop. It should be noted that during rotation the individual parts of the blade are always accelerated inward. This centripetal acceleration is ir ⁇ relevant to the invention, and the term acceleration in this specification means acceleration in the direction of rotation (edgewise acceleration) or out of the rotor plane ( flapwise acceleration) .
  • the vibration damping may be achieved by suspending a mass within or on the blade and connect same to one or more de- vices changing the lift properties on the blade.
  • the mentioned aerodynamic properties are not only limited to the lift of the blade, but may also refer to the resistance and pitch moment of the blade.
  • the lift of the blade may accordingly be increased as well as decreased, for example by the use of a flap which will normally increase the lift when it is lowered.
  • the device according to the invention is by a first embodi ⁇ ment characteristic in that the device is a mass which via a lever system is mounted pivotably about an axis extending in the longitudinal direction of the blade so that by pivoting in a direction crosswise of the rotor plane and through the lever system, the mass will move a flap for re ⁇ cuted lift of the blade.
  • fig. 1 is a diagram of the dynamic loads on a windmill blade
  • fig. 2a-g is a number of examples of known methods for increasing the lift of a blade
  • fig. 3a-c is a number of examples of known methods for reducing the lift of a blade
  • fig. 4 is an embodiment of a device according to the in- vention where the flapwise acceleration of a sus ⁇ pended mass changes the lift of a blade by means of a flap,
  • fig. 5 is an embodiment of a device according to the in- vention where the edgewise acceleration of a sus ⁇ pended mass changes the lift of a blade by means of a turbulator,
  • fig. 6 is an embodiment of a device according to the in ⁇ vention where the acceleration of a suspended mass changes the lift of a blade via a viscous medium
  • fig. 7 is an embodiment of a device according to the in ⁇ vention where the accelerating mass itself is a viscous medium, which can fill or drain an inflat- able flap of a blade,
  • fig. 8 is an embodiment of a device according to the in ⁇ vention where the accelerating mass is connected to a hydraulic valve controlling the pitch angle of the entire windmill blade, and
  • Fig. 1 is a diagram showing the dynamic loads on a windmill blade.
  • the diagram is the result of computerized simulation in terms of the bending moment of the blade root over time.
  • a slow vibration 1 which is due to the variation of the wind profile with the altitude above ground level during one rotor rotation, is overlaid by a quicker vibration 2, which is due to a random excitation of the structure emanating from turbulence.
  • Fig. 2a-g show examples of known methods for changing the aerodynamic properties of a windmill blade, such as an in ⁇ crease in the blade lift.
  • the shown methods comprise various embodiments: Plain flap or aileron 2a, split flap 2b, external airfoil flap 2c, slotted flap 2d, double slotted flap 2e, leading edge slat 2f and vortex generators 2g.
  • Fig. 3a-c show examples of known methods for changing the aerodynamic properties of a windmill blade, such as a re ⁇ duction of the blade lift.
  • the shown methods comprise turbo tape 10, stall strip 11 and ventilation 12.
  • the lift of the blade may accordingly be increased as well as decreased, for example by using a flap, which will nor ⁇ mally increase the lift when it is lowered.
  • Fig. 4 shows an embodiment of a device according to the in ⁇ vention.
  • a mass 13 is suspended pivotably about a point 14a so as to allow the mass to be moved in a flapwise direction (i.e. crosswise of the chord).
  • a lever system 14 By means of a lever system 14 the mass 13 is connected to a flap 15. If the blade is accelerated away from the wind 16, which will be the case when a sudden gust of wind increases the aerodynamic loads, the mass 13 will move towards the driving side 17 of the blade and will thereby take the flap 15 in a direction to- wards lesser lift, whereby the loads on the blade are re ⁇ cuted.
  • Fig. 4 shows an embodiment of a device according to the in ⁇ vention.
  • a mass 13 is suspended pivotably about a point 14a so as to allow the mass to be moved in a flapwise direction (i.e. crosswise of the chord).
  • the mass 13 By means of a lever system 14 the mass 13 is connected to a flap 15. If the blade is accelerated away from
  • FIG. 5 shows another embodiment of a device according to the invention, where a mass 18 is suspended pivotably about a point 19a so as to allow the mass to be moved in an edge ⁇ wise direction (i.e. along the chord).
  • a lever system 19 By means of a lever system 19 the mass 18 is connected to a turbulator 20. If the blade is accelerated forwards in the direction of rota ⁇ tion 21, which will be the case during edgewise stalling vibrations when the lift varies in an unstable manner due to the proper motion of the blade, the mass 18 will move towards the rear edge 22 of the blade and thereby lift the turbulator 20 above the surface 23 of the blade, whereby the lift is again reduced, and the unstable state ceases.
  • Fig. 6 shows a third embodiment of a device according to the invention, where a mass 24 is mounted within a cylinder 25 and centered by to springs 26.
  • the cylinder 25 is filled with a viscous medium 27 and is connected by means of a pipe system 28 to a cylinder 29, which can activate a lift changing device 30.
  • the mass 24 is designed as a piston in the cylinder 25 and is adapted to allow the viscous medium to pass by and/or through itself from one end to the other, in that the mass 24 for example has a smaller diameter than the internal diameter of the cylinder 25 or is provided with longitudinal bores not shown in the drawing.
  • a desired damping may be achieved.
  • the advantage of this embodiment is that by stationary conditions the lift changing device 30 will be unloaded by the vibration damper and may position itself in a position being the result of the aerodynamic reaction forces.
  • Fig. 7 shows a fourth embodiment of a device according to the invention where a mass consists of a viscous liquid 32, which i ⁇ substantially held within a container 33, and by means of a pipe system 34 connected to a lift damping de ⁇ vice 35 having here the shape of an inflatable flap 36.
  • a resilient pipe wall 37 will allow for the required change in volume.
  • Fig. 8 shows yet another embodiment of a device according to the invention.
  • a mass 38 is connected by means of a lever system to a hydraulic valve 39 forming part of a hydraulic system indicated by the letter P.
  • the valve 39 leads the hydraulic medium to a cylinder 40, which in its turn adjusts the pitch angle of the entire blade.
  • Fig. 9 is a diagram showing the dynamic loads on a windmill blade when a device according to the invention, as shown in fig. 4, has been implemented. It is clearly seen that the quick loads from the random excitation (compare with vibra ⁇ tion 2 in fig. 1) have been reduced. The slow vibration, which is due to the variation of the wind profile with the altitude above ground level during one rotor rotation (com- pare with vibration 1 in fig. 1), has not been noticeably reduced, but is also of less importance to the life of the mill.

Landscapes

  • 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

L'invention concerne un procédé pour diminuer les vibrations dans une pale d'éolienne, afin que les charges sur cette pale et sur le reste de la structure de l'éolienne soient diminuées. Selon l'invention, on obtient l'effet recherché en changeant les propriétés aérodynamiques de la pale en fonction de l'accélération et/ou de la vitesse d'un dispositif coulissant dans la direction de rotation et/ou hors du plan du rotor. L'invention concerne également un dispositif pour changer les vibrations d'une pale d'éolienne, ce dispositif, dans une première forme d'exécution, étant caractérisé en ce qu'il s'agit d'une masse (13) qui, par l'intermédiaire d'un système de levier (14), est montée pivotante autour d'un axe (14a) s'étendant dans la direction longitudinale de la pale, de sorte qu'en pivotant dans une direction transversale par rapport au plan du rotor, la masse (13) déplace un volet (15) par le système de levier (14) pour diminuer la portance de la pale.
EP96921911A 1995-06-27 1996-06-26 Procede et dispositif pour diminuer les vibrations dans une pale d'eolienne Withdrawn EP0835380A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK74295 1995-06-27
DK199500742A DK172932B1 (da) 1995-06-27 1995-06-27 Fremgangsmåde og indretning til reduktion af svingninger i en vindmøllevinge.
PCT/DK1996/000283 WO1997001709A1 (fr) 1995-06-27 1996-06-26 Procede et dispositif pour diminuer les vibrations dans une pale d'eolienne

Publications (1)

Publication Number Publication Date
EP0835380A1 true EP0835380A1 (fr) 1998-04-15

Family

ID=8097017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96921911A Withdrawn EP0835380A1 (fr) 1995-06-27 1996-06-26 Procede et dispositif pour diminuer les vibrations dans une pale d'eolienne

Country Status (4)

Country Link
EP (1) EP0835380A1 (fr)
AU (1) AU6298796A (fr)
DK (1) DK172932B1 (fr)
WO (1) WO1997001709A1 (fr)

Families Citing this family (23)

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Publication number Priority date Publication date Assignee Title
DE29720741U1 (de) * 1997-11-22 1998-05-28 aerodyn Engineering GmbH, 24768 Rendsburg Vorrichtung zur Erfassung von Schwingungen der Rotorblätter einer Windkraftanlage
DE19815519A1 (de) 1998-03-31 1999-10-07 Tacke Windenergie Gmbh Rotorblatt für eine Windkraftanlage
DE29807874U1 (de) * 1998-05-04 1999-09-30 Husumer Schiffswerft Inh. Gebrüder Kröger GmbH & Co. KG, 25813 Husum Rotorblattsatz für Windkraftanlage zur Elektrizitätserzeugung
DK174404B1 (da) 1998-05-29 2003-02-17 Neg Micon As Vindmølle med svingningsdæmper
WO2002077449A1 (fr) * 1999-11-11 2002-10-03 Hitachi Zosen Corporation Eolienne de type propulseur destinee a la production d'energie
DK200300670A (da) 2003-05-05 2004-11-06 Lm Glasfiber As Vindmölleving med opdriftsregulerende organer
US7637721B2 (en) * 2005-07-29 2009-12-29 General Electric Company Methods and apparatus for producing wind energy with reduced wind turbine noise
DE102006022266A1 (de) * 2005-11-04 2007-05-10 Daubner & Stommel GbR Bau-Werk-Planung (vertretungsberechtigter Gesellschafter: Matthias Stommel, 27777 Ganderkesee) Windenergieanlage
WO2007089136A2 (fr) * 2006-02-03 2007-08-09 Pantheon Bv Amortissement des vibrations du pylone d'une éolienne
EP2027390B2 (fr) † 2006-06-09 2020-07-01 Vestas Wind Systems A/S Pale d'éolienne et éolienne à régulation de pas
EP2084400B1 (fr) * 2006-10-02 2017-08-09 Vestas Wind Systems A/S Éolienne et procédé destiné à amortir des oscillations dans le sens de la traînée d'une ou plusieurs pales d'une éolienne par modification de l'angle de la pale
ES2324002B1 (es) * 2007-06-22 2010-05-13 GAMESA INNOVATION & TECHNOLOGY, S.L. Pala de aerogenerador con alerones deflectables.
WO2010023278A2 (fr) * 2008-08-29 2010-03-04 Vestas Wind Systems A/S Système de commande dans des pales d’éolienne
DE102008061838A1 (de) * 2008-12-15 2010-06-17 Repower Systems Ag Rotorblatt einer Windenergieanlage mit einem Turbulator
WO2011147422A2 (fr) * 2010-05-27 2011-12-01 Vestas Wind Systems A/S Procédé et appareil pour la réduction de forces induites par l'écoulement de fluide produites par le décollement de tourbillon d'une aube de rotor d'éolienne
US8251657B2 (en) * 2011-01-06 2012-08-28 Siemens Aktiengesellschaft Load mitigation device for wind turbine blades
DE202012005356U1 (de) 2012-05-30 2012-07-10 Petra Staude Rotorblatt für Windturbinen mit Profilen in Tandemanordnung
DE102012216804B4 (de) * 2012-09-19 2015-06-03 Senvion Se Dämpfungssystem und Rotorblatt
EP2851557A1 (fr) * 2013-09-24 2015-03-25 LM WP Patent Holding A/S Pale d'eolienne avec des volets aérodynamiques placés au pied de la pale
CN105134482B (zh) * 2015-07-22 2018-03-06 扬州大学 大型智能风机叶片系统灰色组合建模与优化振动控制的方法
CN112196727A (zh) * 2020-10-28 2021-01-08 山东科技大学 失速非线性颤振抑制式风力机叶片及颤振抑制系统
EP4310318A1 (fr) * 2022-07-21 2024-01-24 Siemens Gamesa Renewable Energy A/S Pale de rotor d'éolienne
CN119145995B (zh) * 2024-09-18 2025-11-18 广东明阳新能源材料科技有限公司 一种风力发电机组叶片涡激振动抑制单元、装置及方法

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DK160632C (da) * 1988-12-23 1991-09-02 Helge Petersen Aerodynamisk bremse paa en vindrotor til en vindmoelle

Non-Patent Citations (1)

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Title
See references of WO9701709A1 *

Also Published As

Publication number Publication date
AU6298796A (en) 1997-01-30
DK74295A (da) 1996-12-28
DK172932B1 (da) 1999-10-11
WO1997001709A1 (fr) 1997-01-16

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