VISUAL INSPECTION OF TURBINE BLADES
A blade monitoring system is provided for inspecting the condition of at least one turbine blade of a wind turbine generator. The wind turbine blade condition monitoring system includes a wind turbine which has at least one blade mounted on a hub, the hub mounted to a nacelle body along an axis of rotation, the nacelle being supported on a tower. A storage location is connected to at least one of the nacelle body and the tower and includes an opening. A storage door is mounted to and selectively covers the opening, acting to enclose the storage location. The blade monitoring system also includes imaging equipment for imaging the at least one blade and a conveyance system. The conveyance system is mounted to at least one of the nacelle body and the tower and is connected to the imaging equipment. The conveyance system conveys the imaging equipment from within the storage location through the opening in a direction generally parallel to a longitudinal axis of the at least one blade.
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The present exemplary embodiment relates to wind turbines. More particularly, it relates to a monitoring system for inspecting the condition of wind turbine rotor blades.
The increasingly complex and optimized blade designs of wind turbine generators, along with the increase in physical scale and sheer volume of off-shore wind turbines, have made the need for blade condition monitoring more critical to ensure early warning of potential design, manufacture, assembly or operation induced damage to the blades.
A variety of camera systems for monitoring the condition of wind turbine components are known. The current state of the art for inspecting turbine blades in fully assembled wind turbine generators includes periodic human inspection of the blades through cameras statically mounted to the wind turbine. Also known is the use of a camera mounted to a lifting device positioned on a vehicle driven up to the tower on which the blades are to be inspected. These methods are subject to a number of limitations. There are environmental restrictions on when such inspections can occur, as well as inaccuracies due to the subjectiveness of the inspection. In addition, there is the physical distance from which the inspection takes place. Inspecting wind turbines mounted in a water environment is particularly problematic due to the relative inaccessibility of such turbines, as well as humidity and corrosion issues. With regard to statically mounted cameras, a limitation is the narrow area of the blade that can be imaged by the camera.
It would be advantageous to provide for automated inspection of wind turbine blades in a wider range of environmental conditions with the ability to inspect the entire blade from root to tip at a closer distance. It would also be desirable to improve the objectiveness of the inspection through processing and analyzing algorithms.
BRIEF DESCRIPTIONAccording to one embodiment of the present disclosure, a wind turbine blade condition monitoring system is provided. In accordance with this embodiment of the disclosure, the wind turbine blade condition monitoring system comprises a wind turbine including at least one blade mounted on a hub, the hub mounted to a nacelle body along an axis of rotation, the nacelle body being supported on a tower. A storage location is connected to or defined in at least one of the nacelle body and the tower. The storage location includes an opening, and a storage door mounted to and selectively covering the opening, and acting to enclose the storage location. The system also includes imaging equipment for imaging the at least one blade and a conveyance system mounted to at least one of the nacelle and the tower and connected to the imaging equipment. The conveyance system conveys the imaging equipment from within the storage location through the opening in a direction generally parallel to a longitudinal axis of the at least one blade.
In accordance with another embodiment of the present disclosure, a wind turbine blade monitoring system is provided. The wind turbine blade condition monitoring system comprises imaging equipment for imaging at least one portion of a blade of an associated wind turbine and a conveyance system mounted to at least one of a nacelle and a tower of the associated wind turbine. The conveyance system comprises a first pulley mounted to the at least one of the nacelle and the tower of the associated wind turbine, a first motor for selectively rotating the first pulley, and a first support cable mounted to the first pulley. The first support cable includes a load end connected to the enclosure and a winding end mounted on the first pulley. The conveyance system moves the imaging equipment in a direction generally parallel to a longitudinal axis of the blade of the associated wind turbine from adjacent a root end of the blade to a tip end thereof.
The disclosure may take form in various components and arrangements of components as will be pointed out more fully hereinafter in conjunction with the written description of the preferred embodiments and illustrated in the accompanying drawings in which:
Referring now in greater detail to the drawings wherein the showings are for purposes of illustrating several embodiments of the disclosure only and not for limiting same.
A conveyance system, mounted to the nacelle body 30, is connected to and conveys an enclosure 40 from within the storage location 32 through the opening 62 and in a direction generally parallel to a longitudinal axis of the at least one blade 22. In this embodiment, the enclosure 40 holds imaging equipment for imaging the at least one blade 22. The conveyance system can include an electromechanical pulley system, comprising a first pulley 66 mounted to the nacelle body 30, and a first support cable 44 mounted on the first pulley 66. The first support cable 44 includes a load end and a winding end, where the winding end is driven by a conventional motor unit (not visible) that rotates the pulley and the load end is attached to the enclosure 40. A power/data cable 42 is connected to imaging equipment held in the enclosure, as is illustrated in
It should be appreciated that the data receiving system 120 could be located remotely from the nacelle 30, if so desired. Communication can be had with such a remotely located data receiving system via RF, for example. In such an embodiment, a conventional RF transmitter (see
With reference to
In this embodiment, the conveyance system comprises first and second pulleys 84, 80 mounted to the nacelle body 30′. A first support cable 88 is mounted on the first pulley 84, and a second support cable 82 is mounted on the second pulley 80, Each of the support cables 82, 88 includes a load end and a winding end. The load end of the second support cable 82 is attached to the enclosure 40′ at a location spaced from where the first support cable 88 is attached to the enclosure 40*. Employing two or more spaced cables is advantageous in order to reduce the tendency of the housing 40′ to swing or pivot, for example due to wind, as the housing is moved up and down generally along a longitudinal axis of the blade 22′. The inspection of the rotor blade is facilitated when the blade to be inspected is placed in the 6 o'clock position, i.e., the rotor blade is extending generally straight down from the hub and is therefore aligned with the tower.
With reference now to
In this embodiment, the conveyance system comprises an electromechanical pulley and track system including at least one pulley 194 and at least one roller 195 mounted to the nacelle body 130, and a support cable 196 supported by the pulleys and rollers. A data and power cable 198 is also provided. The support cable 196 includes a load end and a winding end, where the winding end is driven by a motor unit (not visible) that rotates the at least one pulley 194. The load end is attached to a carriage 192. The enclosure 140′ is attached to the carriage 192 which travels along a track 190 that is attached to the tower. The carriage 192 is supported on the track 190 and is raised and lowered by the support cable 196. The track 190 in this embodiment is supported by and hangs from the nacelle 130. The track 190 also rides against the tower 110. To this end, a series of spaced rollers 184 are attached to the track 190. When the nacelle 130 rotates (i.e., yaws) relative to the tower 110, the rollers allow the track to ride against the tower and rotate with the nacelle. It should be appreciated that the track 190 can extend down the tower 110 the length of the blade 122 in order to enable the carriage 192 to transport the housing 140 from a location adjacent a root end of the blade to a location adjacent a tip end thereof. In order to allow the housing 140 to be retracted into the nacelle 130 for storage, an upper end of the track 190 can extend into the storage area 132. Of course, other embodiments are also contemplated. It should be appreciated that the storage door 164 will need to be modified in order to accommodate the track 190.
With reference now to
In the embodiments thus far illustrated herein, the imaging equipment and its housing have been stored within a cavity defined in the nacelle. However, it should be appreciated that a separate housing member, configured for storing the imaging equipment, could be affixed to a wall of the nacelle instead. In other words, it may be desirable in some circumstances to provide a separate housing member which is mounted to either the nacelle or the tower, which housing or enclosure is meant to accommodate the imaging equipment when such equipment is not needed for inspection of a turbine blade of the wind turbine. One such embodiment is shown in
With reference now to
With reference now to
With reference now to
With reference now to
With reference now to
With reference now to
The enclosure 440 is affixed to the personnel lifting basket 470 and holds imaging equipment for imaging the at least one blade 422. As the basket 470 is raised and lowered, the at least one blade 422 can be imaged. The conveyance system can include an electromechanical pulley system, comprising first and second pulleys 482 mounted to the nacelle body 430, and first and second support cables 486 mounted on the first pulley and second pulley respectively. The first and second support cables 486 each include a load end and a winding end, where the winding end is spooled on a respective pulley which is driven by a conventional motor unit (not visible) that rotates the pulley. The load end of each cable is attached to the personnel lifting basket 470. Of course, more than two cables can be employed, if so desired. Three or four cables may be preferable.
In an alternative embodiment, the information transmitted by the imaging system is sent to a radio frequency transmitter 490 which can also be mounted in or to the basket 470. The transmitter 490 can transmit the information from the sensing system to a remote location. Similarly, there could be a transmitter within the nacelle 430 to transmit the information gathered by the imaging system to a remote location. This may prove particularly advantageous in an off shore wind farm setting.
With reference now to
A conveyance system, mounted to the nacelle body 530 is connected to and conveys a personnel lifting basket 570 from within the storage location 532 through the opening 562 and in a direction generally parallel to a longitudinal axis of the at least one blade 522. The enclosure 540 is affixed to the personnel lifting basket 570 and holds imaging equipment for imaging the at least one blade 522. The conveyance system can include an electromechanical pulley system, comprising first and second pulleys 582 mounted to the nacelle body 530, and first and second support cables 586 mounted on the first pulley and second pulley respectively. The first and second support cables 586 each include a load end and a winding end, where each winding end is spooled on a respective pulley 582 which is driven by a conventional motor unit (not visible) that rotates the pulley. The load end of each cable is attached to the personnel lifting basket 570.
While the imaging system is illustrated in
The exemplary embodiments have been described herein. Obviously, modifications and alterations will occur to others upon reading and understanding the preceding detailed description. It is intended that the exemplary embodiments be construed as including all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims
1. A wind turbine blade condition monitoring system comprising:
- a wind turbine including: at least one blade mounted on a hub, the hub mounted to a nacelle along an axis of rotation, the nacelle being supported on a tower; a storage location connected to or defined in at least one of the nacelle and the tower and including an opening; a storage door mounted to and selectively covering the opening, acting to enclose the storage location;
- imaging equipment for imaging the at least one blade; and,
- a conveyance system mounted to at least one of the nacelle and the tower and connected to the imaging equipment, the conveyance system conveying the imaging equipment from within the storage location through the opening and in a direction generally parallel to a longitudinal axis of the at least one blade.
2. The wind turbine blade condition monitoring system according to claim 1, wherein the conveyance system comprises an electromechanical pulley system, comprising:
- a first pulley mounted to the at least one of the nacelle and the tower;
- a first support cable mounted on the first pulley;
- the first support cable including a load end and a winding end, the winding end driven by a motor unit that rotates the pulley; and,
- wherein the load end is attached to the imaging equipment.
3. The wind turbine blade condition monitoring system according to claim 2, wherein the conveyance system further comprises:
- a second pulley mounted to the at least one of the nacelle and the tower;
- a second support cable mounted on the second pulley;
- the second support cable including a load end and a winding end;
- the load end attached to the enclosure at a location spaced from the first support cable point of attachment.
4. The wind turbine blade condition monitoring system according to claim 1, wherein the conveyance system comprises an electromechanical pulley and track system, comprising:
- a track mounted to the tower;
- a carriage which travels along the track;
- a system of pulleys mounted to the nacelle;
- a support cable supported by the system of pulleys;
- the support cable including a load end and a winding end, the winding end driven by a motor unit that rotates at least one of the system of pulleys;
- the load end attached to the carriage; and,
- wherein the enclosure is attached to the carriage.
5. The wind turbine blade condition monitoring system according to claim 1, wherein the conveyance system further comprises a personnel lifting basket, including;
- at least one pulley mounted inside the nacelle;
- a support cable supported by the at least one pulley;
- the support cable including a load end and a winding end, the winding end driven by a motor unit that rotates the at least one pulley;
- the load end attached to a basket; and wherein the imaging equipment is attached to the basket.
6. The wind turbine blade condition monitoring system according to claim 1, further including sealing surfaces defined on at least one of the storage door and the storage location for sealingly engaging the storage door with the storage location.
7. The wind turbine blade condition monitoring system according to claim 1, further comprising a data receiving system containing processing and analyzing algorithms to analyze data transmitted by the imaging equipment.
8. The wind turbine blade condition monitoring system according to claim 1, wherein the imaging equipment includes a camera and a lens.
9. The wind turbine blade condition monitoring system according to claim 8, further comprising a housing unit defining a hollow chamber holding the imaging equipment and a transparent viewing window, wherein the lens of the imaging equipment faces the transparent viewing window.
10. A wind turbine blade condition monitoring system, comprising:
- imaging equipment for imaging at least one portion of a blade of an associated wind turbine;
- a conveyance system mounted to at least one of a nacelle and a tower of the associated wind turbine, the conveyance system comprising: a first pulley mounted to the at least one of the nacelle and the tower of the associated wind turbine; a first motor for selectively rotating the first pulley; a first support cable mounted to the first pulley, the first support cable including a load end connected to the imaging equipment and a winding end mounted on the first pulley; wherein the conveyance system moves the imaging equipment in a direction generally parallel to a longitudinal axis of the blade of the associated wind turbine from adjacent a root end of the blade to a tip end thereof.
11. The wind turbine blade condition monitoring system according to claim 10, wherein the conveyance system further comprises:
- a second pulley mounted to the at least one of the nacelle and the tower of the associated wind turbine;
- a second support cable mounted to the second pulley, the second support cable including a winding end mounted on the second pulley and a load end connected to the imaging equipment at a point spaced apart from the first support cable point of connection.
12. The wind turbine blade condition monitoring system according to claim 11, wherein the conveyance system further comprises a second motor for selectively rotating the second pulley.
13. The wind turbine blade condition monitoring system according to claim 10, wherein the conveyance system further comprises a data cable carrying data transmitted by the imaging system to a receiving system mounted to the nacelle of the associated wind turbine.
14. The wind turbine blade condition monitoring system according to claim 10, further comprising a radio frequency transmitter for the remote transmission of data to one of the nacelle of the associated wind turbine and a remote location.
15. The wind turbine blade condition monitoring system according to claim 10, wherein the imaging equipment includes a camera and lens.
16. The wind turbine blade condition monitoring system according to claim 10, wherein the conveyance system further comprises a track mounted to a tower of the associated wind turbine.
17. The wind turbine blade condition monitoring system according to claim 10, wherein the conveyance system further comprises a carriage running on the track, the enclosure being mounted to the carriage.
18. The wind turbine blade condition monitoring system according to claim 10, further comprising a housing unit defining a hollow chamber accommodating the imaging equipment and a transparent viewing window, wherein the lens of the imaging equipment faces the transparent viewing window.
19. The wind turbine blade condition monitoring system according to claim 10 wherein the enclosure is mounted to a personnel basket which is moved by the conveyance system.
Type: Application
Filed: Jul 12, 2011
Publication Date: Jan 17, 2013
Applicant:
Inventor: Kevin R. Till (Carpinteria, CA)
Application Number: 13/180,942
International Classification: F01D 5/00 (20060101);