Wind turbine blade root attachment system and method of manufacture
Devices, systems, and methods of manufacturing wind turbine root attachment are provided. In various embodiments, an assembly for wind turbine root attachments includes a bushing, a core, and a filler. The bushing includes a body having cutouts extending from the proximal end to the distal end on either side of the bushing and a core cutout at the distal end. The bushing further includes an ear disposed at the proximal end of the bushing and within the first cutout. The core includes two wedges where the thick end of each wedge abut one another. The thin end of the proximal wedge is disposed within the core cutout and the core includes cutouts extending from the proximal end to the distal end on either side of the core. The filler is disposed within the cutout on the side of the assembly having the ear.
1. A wind turbine blade assembly comprising:
a bushing comprising a body having a proximal end and a distal end, a first cutout extending from the proximal end to the distal end on a first side of the bushing, a second cutout extending from the proximal end to the distal end on a second side of the bushing and a core cutout at the distal end, and an ear disposed at the proximal end of the bushing and within the first cutout;
a core having a proximal end and a distal end, the core comprising a first wedge and a second wedge distal to the first wedge, each wedge having a thick end and a thin end, wherein the thick end of the first wedge abuts the thick end of the second wedge, the thin end of the first wedge disposed within the core cutout, the core comprising a third cutout extending from the proximal end to the distal end on a first side of the core and a fourth cutout extending from the proximal end to the distal end on a second side of the core; and
a filler disposed within the first cutout and the third cutout, the filler contacting the ear.
2. The assembly of claim 1 , wherein the bushing comprises a metal.
3. The assembly of claim 2 , wherein the metal is stainless steel.
4. The assembly of claim 1 , wherein the filler comprises a composite material.
5. The assembly of claim 4 , wherein the composite material comprises glass fiber reinforced polymer.
6. The assembly of claim 5 , wherein the glass fiber reinforced polymer comprises unidirectional fibers.
7. The assembly of claim 1 , wherein the core comprises a foam.
8. The assembly of claim 7 , wherein the foam comprises polyurethane.
9. The assembly of claim 1 , wherein the core cutout comprises a wedge-shaped cutout.
10. The assembly of claim 1 , wherein the core cutout comprises an aperture.
11. The assembly of claim 1 , wherein the first cutout and the second cutout each comprises a cylindrically-shaped cutout.
12. The assembly of claim 1 , wherein the ear comprises a cylinder.
13. The assembly of claim 1 , wherein the thin end of the first wedge is disposed within the core cutout.
14. The assembly of claim 1 , wherein the filler comprises a first portion having a cylindrical shape and a second portion having a conical shape.
15. The assembly of claim 14 , wherein the first portion of the filler is disposed within the first cutout and the second portion of the filler is disposed within the third cutout.
16. A system for wind turbine root attachment, the system comprising:
a plurality of assemblies of claim 1 arranged in a ring;
wherein the ear and the filler of a first of the plurality of assemblies engages the second cutout and the fourth cutout of a second of the plurality of assemblies.
17. The system of claim 16 , wherein the plurality of assemblies form a ring.
18. The system of claim 17 , wherein the ring is disposed within a wind turbine propeller root.
19. A method of forming a wind turbine root attachment system, the method comprising:
providing a plurality of assemblies, each assembly comprising:
a bushing comprising a body having a proximal end and a distal end, a first cutout extending from the proximal end to the distal end on a first side of the bushing, a second cutout extending from the proximal end to the distal end on a second side of the bushing and a core cutout at the distal end, and an ear disposed at the proximal end of the bushing and within the first cutout;
a core having a proximal end and a distal end, the core comprising a first wedge and a second wedge distal to the first wedge, each wedge having a thick end and a thin end, wherein the thick end of the first wedge abuts the thick end of the second wedge, the thin end of the first wedge disposed within the core cutout, the core comprising a third cutout extending from the proximal end to the distal end on a first side of the core and a fourth cutout extending from the proximal end to the distal end on a second side of the core; and
a filler disposed within the first cutout and the third cutout, the filler contacting the ear;
engaging the filler and the ear of a first assembly of the plurality of assemblies into the second cutout and the fourth cutout of a second assembly of the plurality of assemblies; and
forming the plurality of assemblies into a ring.
20. The method of claim 19 , further comprising forming the ring into a blade root of a wind turbine propeller blade.