US20080008586A1 - Rotor blade of a wind power installation, comprising a warning light - Google Patents

Rotor blade of a wind power installation, comprising a warning light Download PDF

Info

Publication number
US20080008586A1
US20080008586A1 US11768804 US76880407A US20080008586A1 US 20080008586 A1 US20080008586 A1 US 20080008586A1 US 11768804 US11768804 US 11768804 US 76880407 A US76880407 A US 76880407A US 20080008586 A1 US20080008586 A1 US 20080008586A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
light
rotor
blade
waveguide
installation
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.)
Abandoned
Application number
US11768804
Inventor
Aloys Wobben
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.)
Wobben Aloys
Original Assignee
Aloys Wobben
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

Links

Images

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0005Light guides specially adapted for lighting devices or systems the light guides being of the fibre type
    • G02B6/0008Light guides specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted at the end of the fibre
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D17/00Monitoring or testing of wind motors, e.g. diagnostics
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS; PRODUCING MECHANICAL POWER; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D80/00Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/10Arrangements for warning air traffic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS, TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY
    • F05B2270/00Control
    • F05B2270/80Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F05B2270/804Optical devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F21W2111/06Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00 for aircraft runways or the like
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction
    • Y02E10/721Blades or rotors

Abstract

A system and method for evaluating rotor blade stress is provided. One embodiment is a rotor blade; a light waveguide extending along a portion of the rotor blade, the light waveguide having a light receiving end and a light issuing end; a light producing device coupled to the light receiving end of the light waveguide and operable to input light into the light waveguide so that the light passes through the light waveguide; a detector coupled to the light issuing end of the light waveguide to measure an amount of light exiting the light issuing end; and an evaluation arrangement operable to receive information from the detector corresponding to the amount of light exiting the light issuing end, and operable to evaluate rotor blade stress based on the amount of light exiting the light issuing end.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • [0001]
    This application is a continuation of and claims priority to copending nonprovisional utility application entitled, “ROTOR BLADE OF A WIND POWER INSTALLATION, COMPRISING A WARNING LIGHT,” having Ser. No. 10/498,187, filed Nov. 19, 2004, which is the U.S. National Phase of PCT/EP02/13845 filed Dec. 6, 2002, which claims priority to Application No. DE 101 60 360.6 filed Dec. 8, 2001, and Application No. DE 102 28 442.3, filed Jun. 26, 2002, which are incorporated herein by reference in their entirety.
  • BACKGROUND
  • [0002]
    1. Technical Field
  • [0003]
    Embodiments relate to rotor blades of a wind power installation.
  • [0004]
    2. Description of the Related Art
  • [0005]
    Wind power installations with rotor blades of the most widely varying kinds have already long been known. It is also known that, in certain situations, the wind power installation has to be provided with a hazard light in order to draw the attention of air traffic in the region of the wind power installation to the existence of the installation, in good time. For the above-indicated purpose it is also known for the rotor blades to be provided with mostly red warning coats of paint so that it is possible to prevent an aircraft, in particular a military aircraft, from colliding with a wind power installation or the rotor thereof.
  • [0006]
    The proposal has also already been put forward, for improving the warning to air traffic, to use incandescent lamps or other lighting means at the tips of the rotor blades, besides coloring the rotor blades with signalling colors, the lamps or lighting means then being switched on at night so that they can be readily seen by air traffic. The disadvantage of incandescent lamps or other lighting means however is that they are only of limited durability and the costs of replacing worn-out lighting means is not reasonably related to the benefit. Thus the costs of replacing lighting means at a rotor blade tip can be several thousand DM, because not only does the wind power installation have to be stopped, which is very expensive, but also the service personnel have to be lifted to the rotor blade tip by means of a crane arrangement from the pylon of the wind power installation or from the ground in front of the wind power installation.
  • [0007]
    That expenditure is grossly mismatched with the actual technical failure.
  • [0008]
    As a solution in this respect, it has therefore also already been proposed that the lighting device at the rotor blade tip may be of a redundant nature. However even such a concept cannot always ensure that the lighting arrangement does not suffer from failure, in which respect the reasons for failure of the lighting means may vary greatly, either that the lighting means at the rotor blade tip are mechanically damaged (hit by particles, hail, rain etc) or the respective electrical contacts are interrupted, or also other reasons.
  • BRIEF SUMMARY
  • [0009]
    A system and method for evaluating rotor blade stress is provided. One embodiment is a rotor blade; a light waveguide extending along a portion of the rotor blade, the light waveguide having a light receiving end and a light issuing end; a light producing device coupled to the light receiving end of the light waveguide and operable to input light into the light waveguide so that the light passes through the light waveguide; a detector coupled to the light issuing end of the light waveguide to measure an amount of light exiting the light issuing end; and an evaluation arrangement operable to receive information from the detector corresponding to the amount of light exiting the light issuing end, and operable to evaluate rotor blade stress based on the amount of light exiting the light issuing end.
  • [0010]
    Another embodiment is a method of measuring rotor blade distortion at a wind power installation that inputs light into a light waveguide of a rotor blade of the wind power installation so that light passes through the light waveguide, detects light emitted from the light waveguide, and evaluating rotor blade stress based on the emitted light.
  • BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
  • [0011]
    The invention is described hereinafter by means of a specific embodiment. In the drawing:
  • [0012]
    FIG. 1 shows a first embodiment of a rotor blade according to the invention, and
  • [0013]
    FIG. 2 shows an alternative further embodiment of a rotor blade.
  • DETAILED DESCRIPTION
  • [0014]
    An object of the invention is to avoid the above-indicated disadvantages and to provide lighting for the rotor blade tips, which is more reliable than that proposed hitherto, wherein any damage which occurs is no longer so complicated and expensive to rectify as hitherto, but can be rectified extremely swiftly.
  • [0015]
    Various embodiments are based on the notion of moving all the lighting means from the tip region (rotor blade tip) of the rotor blades into the region in the proximity of the hub, for example the hub of the rotor itself. If then a lighting means fails, it can be replaced by the service personnel very easily and in a very uncomplicated fashion.
  • [0016]
    While the lighting means, that is to say a light-producing device such as for example a laser or a light emitting diode or a plurality thereof is disposed in the pod of the wind power installation, the light produced is fed into a glass fiber cable (light waveguide, light guide) which in turn is laid into the tip region of the rotor blade and is there arranged at the surface of the rotor blade in such a way that the light can readily issue.
  • [0017]
    Even if, and this is highly improbable, the end region of the light waveguide in the blade tip region should suffer from damage, that does not result in failure of the entire light waveguide, but rather it will continue to emit its light which is guided through it. As however there are no electrical elements whatsoever in the blade tip region, the light waveguides are highly protected.
  • [0018]
    Supplemental to the foregoing, or also alternatively, embodiments use the light guides for implementing possible stress and load measurements on the rotor blade itself.
  • [0019]
    In that respect reference may be made generally to the following: when light is introduced into a light guide, that light is reflected in the interior of the light guide at corresponding edges and is propagated to the exit at the light guide end.
  • [0020]
    From the quotient of the amount of light introduced to the amount of light issuing, it is also possible to assume a value in respect of quality, in which case quality in the optimum situation is one, when therefore the amount of light which is fed into the light guide corresponds to the intensity (lumens) of the amount of light at the issuing end of the light guide.
  • [0021]
    The quality of light guides however depends not just on the material of the light guide or the nature of the light introduced, but also on the way in which the light guide is laid. If for example the light guide is laid along a straight line, quality is generally greater than if the light guide is laid in various geometries involving winding serpentine configurations or arcs or other radii of curvature.
  • [0022]
    Movement of the light guide transversely to the direction in which it extends also means that propagation of the light in the interior of the light guide is in part limited, which has the result that the level of quality overall falls.
  • [0023]
    In accordance with the invention, in case of a rotor blade of a wind power installation, it is also possible to make use of that last-mentioned effect for optically/electrically measuring the flexing of the rotor blade, insofar as a light guide is passed virtually as a loop, beginning from the rotor blade hub by way of a given guide configuration in the rotor blade by way of the rotor blade tip and back to the hub again. Then, arranged at the issuing end of the light guide is a suitable detector which measures the intensity of the issuing light and that issuing amount of light is constantly related to the amount of light passing into the light guide, by way of a suitable processing device (processor).
  • [0024]
    When now with an increasing loading on the rotor blade (rising wind speed), the rotor blade progressively increasingly flexes, that automatically results in worsened or altered quality, and a measurement in respect of the mechanical loading on the rotor blade can also be deduced from the specific level of quality.
  • [0025]
    Therefore, with the above-indicated variant of the invention, it is also possible to establish the loading on a rotor blade not only integrally at the hub, the rotor blade root, but also at individual points, in particular also in the rotor blade tip region, and any overstretching which may occur of the rotor blade tip by virtue of a gust or another event can be very quickly established, and this can also be used at the same time to possibly stop the wind power installation or implement adjustment of the rotor blade angle (pitch) in order to avoid the unwanted overstretch situation, because such overload situations can usually result in a considerable reduction in the service life of the rotor blades and thus the entire wind power installation.
  • [0026]
    It will be self-evident that the light guides can be passed by way of the most widely varying geometries in the rotor blade itself or beneath the uppermost layer of the rotor blade or on the rotor blade. It is not only possible for the light guides to be directly passed from the rotor blade root to the rotor blade tip and back again on one side or on different sides of the rotor blade, but it is also possible for the light guides to be wound in a spiral configuration around the entire rotor blade from the rotor blade root to the rotor blade tip and back, or it is also possible for various bundles of light waveguides to be laid by way of widely varying geometrical configurations in respect of the rotor blade (or in the rotor blade itself.
  • [0027]
    The more a light guide is moved out of its lengthwise direction upon flexing of the rotor blade, the correspondingly greater will the drop in the level of quality generally also be, and by clever measurement and interchange of the outgoing and return lines, it is also possible under some circumstances to accurately establish where unwanted overstretching of a rotor blade takes place or has taken place.
  • [0028]
    The advantage of laying the light waveguides in or on the rotor blade is also that laying them in that way can already be implemented during production of the rotor blades and the light guides themselves are usually extremely robust and, as the light guides themselves are electrically non-conductive, they are also accordingly already well protected from possible disturbances due to a lightening strike on the rotor of the wind power installation.
  • [0029]
    In addition possible overloading of the rotor blade can be measured with the light guides (or waveguides) markedly more quickly than for example with a strain gauge strip (SGS) or another measuring device which measures the mechanical loading on a rotor blade integrally in the hub region or root region of the rotor blade. As an electrical signal about the intensity of the issuing light is also equally available by way of the light detector at the exit end of the light waveguide, that electrical signal can also be directly passed to a remote monitoring station of the wind power installation and can there be suitably evaluated and can be used for very swift intervention in the installation if the installation does not already have automatic control devices which, when the level of quality falls below a given value, automatically implement installation control or modification resulting in a relief of load on the rotor blades.
  • [0030]
    When the light waveguides are laid as a rotor blade tip lighting arrangement (tip lighting arrangement), it may also be appropriate for the tip lighting arrangement not to be switched on over the entire rotational extent of the rotor, but only when the respective rotor blade is in a region between the nine o'clock and three o'clock positions (the rotor blade rotating in the clockwise direction) or preferably only in the region between the ten o'clock and two o'clock positions.
  • [0031]
    It is also possible, by virtue of feeding in light by means of diodes, to feed not just monochrome white light into the light waveguides but also light of varying colors, and the light can also be directly emitted in various directions by virtue of the appropriate issue of the light waveguides at the rotor blade tip, in which case, to increase the level of intensity, the ends of the light waveguide are provided with a suitable lens which in turn at the same time once again also protects the corresponding end of the light waveguide.
  • [0032]
    FIG. 1 shows a rotor blade 10 with a light waveguide 14 which is laid thereon (or therein) and which is laid in a meander configuration in the region of the rotor blade tip 15. A light emitting diode 16 is arranged at a connection of the light waveguide 14 and a corresponding light receiving diode 18 is arranged at the other connection. Light is fed into the light waveguide by the light emitting diode and the receiving diode 18 receives the light which has passed through the light guide.
  • [0033]
    Before now the wind power installation is brought into operation and the rotor blade is completely non-deflected (that is to say is no longer deformed by the wind), reference measurements are now implemented, the amount of received light being measured in the light receiving unit 18 in that situation. The quantitative proportion of light can usually also be expressed as a percentage value, the percentage value always being below 100%. With a measured value of 100%, the total light emitted by the sender unit 16 would have to arrive in the receiving unit 18 through the light waveguide 14 and the level of quality would then be 1.
  • [0034]
    When now the wind power installation is brought into operation, that also has the result, by virtue of the wind and dynamic pressure, that the entire rotor blade is deflected, in particular in the tip region. At the same time that also involves a change in the original position of the light waveguides, and that usually also results in a different reflection path within the light waveguide. The consequence of that is usually a reduction in the light yield with respect to the reference condition, and that lesser light yield is measured in the receiving unit 18.
  • [0035]
    Accordingly the quantitative light measurement (light modulation measurement) in the receiving unit 18 (or light modulation measurement) can also ascertain a magnitude in respect of the deflection of the rotor blade as, upon deflection of the blade, the quality is below the level of quality in the reference condition.
  • [0036]
    If certain overstretching effects in respect of a rotor blade are unwanted, that is to say the level of quality falls below a predetermined value, then that can also be monitored by means of the invention and if necessary the measured data can also be used to shut down the entire wind power installation for its own protection.
  • [0037]
    The above-described alternative according to the invention also has the advantage that, in the event of a hairline crack which may possibly be present in the rotor blade of the wind power installation, with the hairline crack extending substantially transversely with respect to the light guide, the light guide can very quickly be torn away so that the entire transmission of light is then not only disturbed but can also collapse. A light guide can be torn away in that fashion because the light guides are usually designed to be extremely porous, in respect of their lengthwise extent, and are only slightly elastic. If now transmission of light through the light guide is sensitively disturbed by a hairline crack, the entire installation can be stopped and the rotor blade can be very closely investigated for possible hairline cracks at an early stage.
  • [0038]
    FIG. 1 does not show the arrangement for further processing of the measured light. This can involve conventional arrangements which produce an electrical signal from the measured amount of light and the corresponding electrical signal is then further processed in a processor or another processing apparatus in such a way that the quantitative value of the received light is ascertained, which is then also possibly related to the amount of light which has passed into the light guide. The value in respect of quality can be deduced directly from that difference value (amount of emitted light/amount of received light). It is appropriate to provide in a suitable memory a table for given levels of quality, wherein, when the ascertained quality falls below or rises above the given levels of quality, suitably desired measures can then be taken in relation to the wind power installation, for example the installation can be shut down.
  • [0039]
    Alternatively or supplemental to the structure shown in FIG. 1 FIG. 2 shows a bundle of light waveguides which are laid from the hub of the rotor blade (rotor blade root) to the rotor blade tip. In the hub region, light is fed into the light waveguides by means of a light 14 and in the tip region the light issues from the light waveguides so that the tip region is well lit at least at night and thus the attention of air traffic is drawn to the wind power installation.
  • [0040]
    It will be appreciated that the above-mentioned alternatives can also be combined with each other so that, besides an illuminated tip, it is also possible to implement monitoring of the light deflection of a rotor blade. The light 14 can in that case also represent a light emitting diode.
  • [0041]
    It will be appreciated that switching-on of the lights 14 and 16 can be made dependent on the respective time of day, darkness or the respective position of an individual rotor blade, for example the lights can be switched on when a rotor blade is in a 10.00 hours to 12.00 hours/14.00 hours position.
  • [0042]
    That measure has the advantage that on the one hand the lighting means are conserved and in addition the lighting means are lit up only in a rotor blade position where the rotor blade is still visible. In addition, pollution in respect of the environment around the wind power installation is minimized, when the lighting means are switched on.
  • [0043]
    It is apparent that the described tip lighting arrangement by means of a light waveguide can also be embodied by way of other lighting means, for example LEDs which are then supplied with power by way of suitable cables.
  • [0044]
    The control device for controlling the lighting means is preferably coupled to the wind power installation control system so that the lighting means can be switched on in dependence on rotor blade position.
  • [0045]
    All of the above U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and/or listed in the Application Data Sheet, are incorporated herein by reference, in their entirety.
  • [0046]
    From the foregoing it will be appreciated that, although specific embodiments of the invention have been described herein for purposes of illustration, various modifications may be made without deviating from the spirit and scope of the invention. Aspects of the embodiments can be modified, if necessary to employ concepts of the various patents, applications and publications to provide yet further embodiments. Accordingly, the invention is not limited except as by the appended claims.
  • [0047]
    These and other changes can be made to the embodiments in light of the above-detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.

Claims (25)

  1. 1. A wind power installation system, comprising:
    a rotor blade;
    a light waveguide extending along a portion of the rotor blade, the light waveguide having a light receiving end and a light issuing end;
    a light producing device coupled to the light receiving end of the light waveguide and operable to input light into the light waveguide so that the light passes through the light waveguide;
    a detector coupled to the light issuing end of the light waveguide to measure an amount of light exiting the light issuing end; and
    an evaluation arrangement operable to receive information from the detector corresponding to the amount of light exiting the light issuing end, and operable to evaluate rotor blade stress based on the amount of light exiting the light issuing end.
  2. 2. The system of claim 1, further comprising:
    a control arrangement in communication with the evaluation arrangement and operable to switch off the wind power installation in response to the evaluated rotor blade stress indicating an overload of the rotor blade.
  3. 3. The system of claim 1, further comprising:
    a control arrangement in communication with the evaluation arrangement and operable to change a pitch of the rotor blade in response to the evaluated rotor blade stress indicating an overload of the rotor blade.
  4. 4. The system of claim 1 wherein a portion of the light waveguide extends from a hub connection of the rotor blade to a tip of the rotor blade, and back to the hub connection of the rotor blade.
  5. 5. The system of claim 1 wherein a portion of the light waveguide is in a spiral configuration.
  6. 6. The system of claim 1 wherein a portion of the light waveguide is in a winding serpentine configuration.
  7. 7. The system of claim 1 wherein a first portion of the light waveguide is in a straight line, and wherein a second portion of the light waveguide is in an arc.
  8. 9. The system of claim 1 wherein a portion of the light waveguide is within the rotor blade.
  9. 9. The system of claim 1 wherein a portion of the light waveguide is on an exterior surface of the rotor blade.
  10. 10. The system of claim 1, further comprising:
    a second light waveguide extending along a second portion of the rotor blade; and
    a second detector coupled to a light issuing end of the second light waveguide and operable to measure a second amount of light exiting the light issuing end of the second light waveguide,
    wherein the evaluation arrangement receives information from the second detector corresponding to the second amount of light to further evaluate the rotor blade stress based on the second amount of light.
  11. 11. The system of claim 1 wherein the evaluation arrangement evaluates mechanical loading of the rotor blade based on the amount of light exiting the light issuing end.
  12. 12. The system of claim 1 wherein the light producing device comprises:
    a light emitting diode.
  13. 13. The system of claim 1 wherein the light producing device comprises:
    a laser.
  14. 14. A method of measuring rotor blade distortion at a wind power installation, comprising:
    inputting light into a light waveguide of a rotor blade of the wind power installation so that light passes through the light waveguide;
    detecting light emitted from the light waveguide; and
    evaluating rotor blade stress based on the emitted light.
  15. 15. The method of claim 14 wherein evaluating the rotor blade stress comprises:
    determining the amount of stress on the rotor blade based upon the evaluated emitted light.
  16. 16. The method of claim 14 wherein evaluating the rotor blade stress comprises:
    determining an amount of mechanical loading on the rotor blade based upon the evaluated emitted light.
  17. 17. The method of claim 16 wherein determining the amount of the mechanical loading comprises:
    determining the mechanical loading on a hub of the rotor blade based upon the evaluated emitted light.
  18. 18. The method of claim 16 wherein determining the amount of the mechanical loading comprises:
    determining the mechanical loading at a portion of the rotor blade based upon the evaluated emitted light.
  19. 19. The method of claim 14, further comprising:
    switching off the wind power installation to relieve a load on the rotor blade in response to the rotor blade stress indicating an overload of the rotor blade.
  20. 20. The method of claim 14, further comprising:
    adjusting a pitch of the rotor blade to relieve a load on the rotor blade in response to the rotor blade stress indicating an overload of the rotor blade.
  21. 21. The method of claim 14 wherein evaluating the rotor blade stress comprises:
    determining an altered quality of the rotor blade based upon the evaluated rotor blade stress.
  22. 22. The method of claim 14, further comprising:
    communicating the evaluated rotor blade stress to a remote monitoring station.
  23. 23. The method of claim 14 wherein evaluating the rotor blade stress comprises:
    evaluating the rotor blade stress on a hub of the rotor blade.
  24. 24. The method of claim 14 wherein evaluating the rotor blade stress comprises:
    evaluating the rotor blade stress at a portion of the rotor blade.
  25. 25. The method of claim 14 wherein evaluating the rotor blade stress comprises:
    evaluating the rotor blade stress at a tip of the rotor blade.
US11768804 2001-12-08 2007-06-26 Rotor blade of a wind power installation, comprising a warning light Abandoned US20080008586A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE2001160360 DE10160360B4 (en) 2001-12-08 2001-12-08 Rotor blade and a wind turbine with a rotor blade
DE10160360.6 2001-12-08
DE10228442.3 2002-06-26
DE10228442 2002-06-26
PCT/EP2002/013845 WO2003050412A1 (en) 2001-12-08 2002-12-06 Rotor blade of a wind power installation, comprising a warning light
US10498187 US7238007B2 (en) 2001-12-08 2002-12-06 Rotor blade of a wind power installation, comprising a warning light
US11768804 US20080008586A1 (en) 2001-12-08 2007-06-26 Rotor blade of a wind power installation, comprising a warning light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11768804 US20080008586A1 (en) 2001-12-08 2007-06-26 Rotor blade of a wind power installation, comprising a warning light

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
PCT/EP2002/013845 Continuation WO2003050412A1 (en) 2001-12-08 2002-12-06 Rotor blade of a wind power installation, comprising a warning light
US10498187 Continuation US7238007B2 (en) 2001-12-08 2002-12-06 Rotor blade of a wind power installation, comprising a warning light

Publications (1)

Publication Number Publication Date
US20080008586A1 true true US20080008586A1 (en) 2008-01-10

Family

ID=26010737

Family Applications (2)

Application Number Title Priority Date Filing Date
US10498187 Active 2023-04-16 US7238007B2 (en) 2001-12-08 2002-12-06 Rotor blade of a wind power installation, comprising a warning light
US11768804 Abandoned US20080008586A1 (en) 2001-12-08 2007-06-26 Rotor blade of a wind power installation, comprising a warning light

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US10498187 Active 2023-04-16 US7238007B2 (en) 2001-12-08 2002-12-06 Rotor blade of a wind power installation, comprising a warning light

Country Status (9)

Country Link
US (2) US7238007B2 (en)
EP (2) EP1461530B1 (en)
JP (1) JP4499419B2 (en)
KR (1) KR20040073461A (en)
CN (1) CN1328504C (en)
CA (1) CA2471802C (en)
DK (1) DK1461530T3 (en)
ES (1) ES2545375T3 (en)
WO (1) WO2003050412A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120155058A1 (en) * 2010-12-15 2012-06-21 Industrias Technoflex, S.A. Wind generator with protection for flying animals

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10259680B4 (en) * 2002-12-18 2005-08-25 Aloys Wobben Rotor blade of a wind turbine
US20060051207A1 (en) * 2004-09-03 2006-03-09 Becerra Steven R Light emitting diode array mounted within windmill wing tip
DK200501778A (en) * 2005-12-16 2007-06-17 Lm Glasfiber As The light in the wind power installation
DE102006002708B4 (en) * 2006-01-19 2007-12-06 Siemens Ag Rotor of a wind power installation
DE102006007536A1 (en) * 2006-02-16 2007-08-30 Aloys Wobben Wind turbine with flight navigation device
CN101460901B (en) * 2006-05-15 2011-06-29 易格斯创新技术系统有限公司 Method for monitoring the load on rotor blades of wind energy installations
US7780328B2 (en) 2006-07-14 2010-08-24 Bae Systems Plc Heat distribution in a distributed lighting apparatus
US7854590B2 (en) * 2007-03-12 2010-12-21 Bell Helicopter Textron Inc. Rotor blade visual lights
US8665138B2 (en) * 2007-07-17 2014-03-04 Laufer Wind Group Llc Method and system for reducing light pollution
EP2053239B1 (en) 2007-10-23 2012-11-28 Siemens Aktiengesellschaft Method for controlling of wind turbines in a wind farm
ES2353320B1 (en) 2008-02-08 2012-01-25 Gamesa Innovation & Technology S.L. Wind turbine blade with a light beacon at its tip.
EP2112374B1 (en) 2008-04-21 2015-11-18 Siemens Aktiengesellschaft Crack detection system
US20100018316A1 (en) * 2008-07-24 2010-01-28 United Technologies Corporation NSMS flight laser detector cooling system
DE102008034747B3 (en) * 2008-07-24 2009-09-10 Wobben, Aloys Nacelle for use on rotor hub in wind turbine, has two lateral lighting devices arranged at two opposite sides of nacelle, where one of middle and lateral lighting devices is accessible from interior of nacelle and/or is foldable in interior
US7984656B2 (en) * 2008-07-24 2011-07-26 United Technologies Corporation NSMS flight laser detector system
EP2199608B1 (en) * 2008-12-19 2014-04-30 Siemens Aktiengesellschaft Wind power plant and method for operating obstacle or danger warning lights of a wind power plant
JP2010270623A (en) * 2009-05-19 2010-12-02 Tokyo Electric Power Co Inc:The Wind power generator
DE102009026407B4 (en) * 2009-05-20 2016-09-15 Wobben Properties Gmbh Method for controlling a flight obstacle lights
DE102009036517A1 (en) * 2009-08-07 2011-02-17 Aerodyn Engineering Gmbh Wind energy installation having means for minimizing load
ES2387364B1 (en) * 2010-09-14 2013-07-29 Gamesa Innovation & Technology, S.L. electronic module and method used for the marking of the blade tip
DE102010046394A1 (en) * 2010-09-24 2012-03-29 Repower Systems Ag Offshore wind park lighting

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723722A (en) * 1970-09-14 1973-03-27 Dyonics Inc Helicopter lighting
US4295738A (en) * 1979-08-30 1981-10-20 United Technologies Corporation Fiber optic strain sensor
US4525626A (en) * 1982-03-24 1985-06-25 Sperry Corporation Fiber optic vibration modal sensor
US4653096A (en) * 1984-03-16 1987-03-24 Nippon Gakki Seizo Kabushiki Kaisha Device for forming a simulated stereophonic sound field
US4812645A (en) * 1981-08-24 1989-03-14 G2 Systems Corporation Structural monitoring system using fiber optics
US4930852A (en) * 1989-02-21 1990-06-05 Simmonds Precision Product, Inc. Optical fiber mounting and structural monitoring
US5321257A (en) * 1991-07-31 1994-06-14 Danisch Lee A Fiber optic bending and positioning sensor including a light emission surface formed on a portion of a light guide
US5701370A (en) * 1995-08-11 1997-12-23 Lockheed Martin Energy Systems, Inc. Optical fiber sensors for monitoring joint articulation and chest expansion of a human body
US5798521A (en) * 1996-02-27 1998-08-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Apparatus and method for measuring strain in bragg gratings
US20020029097A1 (en) * 2000-04-07 2002-03-07 Pionzio Dino J. Wind farm control system
US6619918B1 (en) * 1999-11-03 2003-09-16 Vestas Wind Systems A/S Method of controlling the operation of a wind turbine and wind turbine for use in said method
US6641366B2 (en) * 2001-01-26 2003-11-04 Thorsten Nordhoff Wind power generating system with an obstruction lighting or night marking device
US6804008B1 (en) * 2001-11-14 2004-10-12 Fiber Optic Systems Technology, Inc. Fiber optic sensing instrument and system with fiber of adjustable optical path length and method of using it

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE676166C (en) * 1936-09-22 1939-05-27 Hermann Honnef Lighting device for the wings of wind power plants
GB2093617B (en) * 1981-02-24 1985-05-15 Lock Trevor John Visual display device
US4653906A (en) * 1984-08-13 1987-03-31 United Technologies Corporation Spatially resolving fiber-optic crosstalk strain sensor
JP3576262B2 (en) * 1995-03-28 2004-10-13 三菱重工業株式会社 Destruction foreseeable type gfrp made of wind turbine blades and the fracture prediction method
DE19731918B4 (en) * 1997-07-25 2005-12-22 Wobben, Aloys, Dipl.-Ing. Wind turbine
JP3475389B2 (en) * 1997-12-16 2003-12-08 Jfeエンジニアリング株式会社 Aviation obstacle lights flashing apparatus of the wind power generator
JP2000018147A (en) * 1998-07-07 2000-01-18 Agency Of Ind Science & Technol Failure prediction method of a blade for wind power generation system
WO2000070307A3 (en) * 1999-05-12 2001-03-08 Joerg Huebner A sensor and a method for determining the direction and the amplitude of a bend
DE20008289U1 (en) 2000-05-09 2000-08-10 Wobben Aloys Flight navigation device on wind turbines
DE20015183U1 (en) 2000-09-02 2000-12-21 Moeller Gerd Night marking of aviation obstacles for wind turbines in / on rotor blade ends
DE20021970U1 (en) * 2000-12-30 2001-04-05 Igus Ingenieurgemeinschaft Umw Means for monitoring the state of rotor blades on wind turbines
DE20101375U1 (en) * 2001-01-26 2001-06-21 Nordhoff Thorsten Wind power installation having a device for obstacle lighting and night marking
DE20103294U1 (en) * 2001-02-14 2001-09-27 Uckerwerk Energietechnik Gmbh Integrated rotor obstacle lighting system for wind turbines

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723722A (en) * 1970-09-14 1973-03-27 Dyonics Inc Helicopter lighting
US4295738A (en) * 1979-08-30 1981-10-20 United Technologies Corporation Fiber optic strain sensor
US4812645A (en) * 1981-08-24 1989-03-14 G2 Systems Corporation Structural monitoring system using fiber optics
US4525626A (en) * 1982-03-24 1985-06-25 Sperry Corporation Fiber optic vibration modal sensor
US4653096A (en) * 1984-03-16 1987-03-24 Nippon Gakki Seizo Kabushiki Kaisha Device for forming a simulated stereophonic sound field
US4930852A (en) * 1989-02-21 1990-06-05 Simmonds Precision Product, Inc. Optical fiber mounting and structural monitoring
US5321257A (en) * 1991-07-31 1994-06-14 Danisch Lee A Fiber optic bending and positioning sensor including a light emission surface formed on a portion of a light guide
US5701370A (en) * 1995-08-11 1997-12-23 Lockheed Martin Energy Systems, Inc. Optical fiber sensors for monitoring joint articulation and chest expansion of a human body
US5798521A (en) * 1996-02-27 1998-08-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Apparatus and method for measuring strain in bragg gratings
US6619918B1 (en) * 1999-11-03 2003-09-16 Vestas Wind Systems A/S Method of controlling the operation of a wind turbine and wind turbine for use in said method
US20020029097A1 (en) * 2000-04-07 2002-03-07 Pionzio Dino J. Wind farm control system
US6641366B2 (en) * 2001-01-26 2003-11-04 Thorsten Nordhoff Wind power generating system with an obstruction lighting or night marking device
US6804008B1 (en) * 2001-11-14 2004-10-12 Fiber Optic Systems Technology, Inc. Fiber optic sensing instrument and system with fiber of adjustable optical path length and method of using it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120155058A1 (en) * 2010-12-15 2012-06-21 Industrias Technoflex, S.A. Wind generator with protection for flying animals

Also Published As

Publication number Publication date Type
JP4499419B2 (en) 2010-07-07 grant
WO2003050412A1 (en) 2003-06-19 application
CA2471802C (en) 2009-06-30 grant
DK1461530T3 (en) 2015-09-14 grant
ES2545375T3 (en) 2015-09-10 grant
KR20040073461A (en) 2004-08-19 application
CN1328504C (en) 2007-07-25 grant
EP1461530A1 (en) 2004-09-29 application
US7238007B2 (en) 2007-07-03 grant
EP2161447A2 (en) 2010-03-10 application
CN1599840A (en) 2005-03-23 application
JP2005511968A (en) 2005-04-28 application
EP2161447A3 (en) 2014-12-03 application
EP1461530B1 (en) 2015-06-24 grant
US20050079052A1 (en) 2005-04-14 application
CA2471802A1 (en) 2003-06-19 application

Similar Documents

Publication Publication Date Title
US6577794B1 (en) Compound optical and electrical conductors, and connectors therefor
US6249375B1 (en) Optical element for traffic signs, display panels or the like
US3515485A (en) Blade tracking system
US20090296018A1 (en) Light-Emitting Device
US6289742B1 (en) Method and apparatus for detecting damage to a sheath of a synthetic fiber rope
US20090041413A1 (en) Retractable optical fiber tether assembly and associated fiber optic cable
US5539624A (en) Illuminated hose
US6520666B1 (en) Apparatus for lighting spaces, bodies or surfaces
US6028535A (en) Integrated approach lighting system and method of use thereof
US6521879B1 (en) Method and system for controlling an LED backlight in flat panel displays wherein illumination monitoring is done outside the viewing area
US6867710B2 (en) Aircraft beacon device on wind power installations
US5729335A (en) Optical fiber monitoring apparatus and an associated method for monitoring bending or strain on an optical fiber during installation
US5248128A (en) Remote end detection
US6762695B1 (en) Radio tower lighting system
US7083315B2 (en) Elevated airfield runway and taxiway edge-lights utilizing light emitting diodes
WO2005068834A1 (en) Monitoring the operation of a wind energy plant
US5142141A (en) Crack growth measurement network with primary and shunt optical fibers
WO2011110217A1 (en) Light strip
US20110138937A1 (en) System and method for wind turbine inspection
WO1998001340A1 (en) A method and a system for deicing of airfoil wings of composite material
US20120207589A1 (en) Detection of ice on airfoils
WO2000070687A1 (en) Led module for signaling devices
US7187825B2 (en) System and method for extending viewing angle of light emitted from light pipe
US6641366B2 (en) Wind power generating system with an obstruction lighting or night marking device
GB2051447A (en) Optical display apparatus