Lightweight composite truss wind turbine blade
A lightweight wind turbine blade formed with a truss support structure assembly of composite truss joints including composite spar and cross members attached to and supporting in spaced relation a spine of lightweight rib panels. The rib panels are oriented in parallel spaced relation from one another and individually molded with perimeters defining individual areas of curvature for the finished blade assembly. The truss support structure is covered with a lightweight fiberglass or hardened fabric skin attached to and fitted on respective rib panel edges forming an airfoil structure.
1. A method of fabricating a wind turbine blade assembly, including:
selecting a plurality of rib panels;
forming a plurality of composite support members;
curing the support members;
setting a predetermined number of mounting fixtures spaced from one another at predetermined distances;
mounting at least some of the rib panels to respective fixtures;
mounting a predetermined number of support members to the perimeter edges of respective rib panels to form spar members from a root region of the assembly to a tip region of the assembly and defining joint intersections therein;
affixing another predetermined number of support members between respective adjacent ribs to form cross members, the cross members further affixed to the spar members and connecting therebetween adjacent spar members at respective adjacent joint intersections; and
fastening a skin assembly to the perimeter edges of the rib panels.
2. The method of fabricating a wind turbine blade assembly of claim 1 , wherein:
the spar members are formed with a U-shaped channel and the cross member ends are vertically disposed and affixed within the U-shaped channel of vertically adjacent spar members.
3. The method of fabricating a wind turbine blade assembly of claim 2 , wherein:
some of the vertically disposed cross members are formed with a slot on one end and at least one cross member is affixed diagonally between adjacent joint intersections within respective vertically disposed cross member slots.
4. The method of fabricating a wind turbine blade assembly of claim 1 , wherein:
at least one cross member is affixed diagonally between adjacent joint intersections.
5. The method of fabricating a wind turbine blade assembly of claim 1 , wherein:
the rib panels are shaped to define areas of varying curvature along the blade assembly.
6. The method of fabricating a wind turbine blade assembly of claim 1 , further comprising:
forming a skin assembly by covering the rib panels and support members with a fabric;
heatshrinking the fabric;
coating the fabric with a resin; and
allowing the resin to harden.
7. The method of fabricating a wind turbine blade assembly of claim 1 , wherein:
forming the support members is performed using a pultrusion technique.