Method for connecting two wind turbine blade portions, method for producing a wind turbine, and method for connecting two molded portions
Provided is a method for connecting two wind turbine blade portions, the method including the steps of: a) providing) a first wind turbine blade portion and a second wind turbine blade portion, b) providing a plurality of first markers on the first blade portion and providing a plurality of second markers on the second blade portion, c) determining of target positions of the first markers and the second markers, d) aligning the wind turbine blade portions to each other and comparing actual positions of the first markers and the second markers with the target positions, and e) connecting the wind turbine blade portions together. Therefore, a shape accuracy of a wind turbine blade can be improved.
1. A method for connecting two wind turbine blade portions, the method comprising the steps of:
a) providing a first wind turbine blade portion and a second wind turbine blade portion, wherein the first wind turbine blade portion is in a first lower mold part such that an upper portion of an outer surface of the first blade portion includes an exposed outer surface of the first blade portion and a lower portion of the outer surface of the first blade portion is not exposed, and wherein the second wind turbine is in a second lower mold part such that an upper portion of an outer surface of the second blade portion includes an exposed outer surface of the second blade portion and a lower portion of the outer surface of the second blade portion is not exposed,
b) providing a plurality of first markers on the exposed outer surface of the first blade portion while the first blade portion is still in the first lower mold part and providing a plurality of second markers on the exposed outer surface of the second blade portion while the second blade portion is still in the second lower mold part,
c) determining target positions of the first markers and the second markers after the first blade portion has been removed from the first lower mold part and the second blade portion has been removed from the second lower mold part,
d) aligning the wind turbine blade portions to each other and comparing actual positions of the first markers and the second markers with the target positions, wherein the aligning and/or the comparing are executed by digital image correlation, and
e) connecting the wind turbine blade portions together.
2. The method according to claim 1 , wherein in step a) the first wind turbine blade portion is molded by a first mold including the first lower mold part and the second wind turbine blade portion is molded by a second mold including the second lower mold part.
3. The method according to claim 2 , wherein the first markers are created after molding of the first blade portion and/or the second markers are created after molding of the second blade portion.
4. The method according to claim 1 , wherein initial positions of the first and the second markers are determined during or immediately after step b).
5. The method according to claim 4 , wherein the target positions of the first markers and/or the second markers are determined by the initial positions of the first markers and/or the second markers.
6. The method according to claim 5 , wherein the target positions of the first markers and the second markers are determined by setting a relation between the initial position of the first markers relative to the initial positions of the second markers.
7. The method according to claim 1 , wherein the actual positions of the first and/or the second markers are detected during step d) by detecting means or detector.
8. The method according to claim 1 , wherein step d) is executed by a carrying device which is configured to move the first wind turbine blade portion in at least 3, 4, 5 or 6 degrees of freedom relative to the second wind turbine blade portion.
9. The method according to claim 8 , wherein the carrying device is configured to move the second wind turbine blade portion in at least 3, 4, 5 or 6 degrees of freedom relative to the first wind turbine blade portion.
10. The method according to claim 1 , wherein in step d) and/or e) leading edges of the first and the second wind turbine blade portions face downward or upward.
11. The method according to claim 1 , wherein the first and the second markers are digitally generated points and/or concretely created on the respective wind turbine blade portion.
12. The method according to claim 1 , wherein the first wind turbine blade portion and the second wind turbine blade portion are adjacent longitudinal segments of a wind turbine blade.
13. A method for producing a wind turbine, the method comprising the steps of:
a2) connecting two wind turbine blade portions according to the method of claim 1 such that the wind turbine blade is provided, and
b2) connecting the wind turbine blade to a hub of the wind turbine.