Thermoplastic Spar Cap Welding for Wind Turbine Blades
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Solution Overview
Problem
The manufacturing of spar caps for wind turbine rotor blades using traditional laminate composite materials is labor-intensive and prone to defects due to the handling of non-cured fabrics and challenges in infusing large laminated structures, and the use of pre-formed composites presents difficulties in coupling adjacent composite structures.
Innovation Solution
A method and system for manufacturing spar caps using thermoplastic-based composite plates, where a stack of plates formed from continuous fiber-reinforced composites is welded together using heat and pressure, either with a heated roller or a heated pressing device, to form a strong and conformable spar cap that matches the shape of the rotor blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional laminate composite materials with dry or non-cured fabric plies are used, then the spar cap can be formed through resin infusion, but the manufacturing process becomes labor-intensive and defect-prone
Solution Approach 1:
The patent applies preliminary action by pre-forming the composite material into plates with the desired shape and structural properties before the final assembly stage. The plates are pre-cured and pre-shaped, eliminating the need for labor-intensive handling of non-cured fabrics and resin infusion processes during final manufacturing.
Solution Approach 2:
The patent changes the material state parameter from non-cured fabric plies to pre-cured composite plates. This parameter change transforms the manufacturing process from resin infusion to thermal welding, significantly reducing labor intensity and defects while maintaining structural integrity.
2Reliability
If thicker pre-formed composites are used to reduce defects, then manufacturing reliability improves, but coupling adjacent composite structures becomes challenging
Solution Approach 1:
The patent replaces mechanical coupling methods (such as bolting or rigid joining) with thermal welding processes. The thermoplastic matrix material is heated to its melting point and then pressed together, creating a seamless bond between adjacent composite structures that maintains structural integrity without complex mechanical fastening systems.
3Power
If rotor blades are made longer to produce more power, then energy generation increases, but the blades require increased stiffness and weight which complicates manufacturing
Solution Approach 1:
The patent applies segmentation by dividing the spar cap into multiple pre-formed plate sections that can be manufactured independently and then thermally welded together. This segmentation allows for modular manufacturing of long rotor blade components, reducing overall manufacturing complexity while enabling the production of longer, more powerful blades.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient and defect-free manufacturing of spar caps with improved structural integrity, reducing labor costs and enhancing the stiffness and buckling resistance of wind turbine rotor blades.
Implementation Method 1
transporting the first and second plates past a heated roller to heat the thermoplastic resin material of the plates
Implementation Method 2
pressing the first and second plates together such that the thermoplastic resin material of the first plate is welded to the thermoplastic resin material of the second plate
Data Source
AI summary
In one aspect, a method for manufacturing a spar cap for a wind turbine rotor blade may generally include stacking a plurality of plates together to form a plate assembly, wherein each of the plates is formed from a fiber-reinforced composite including a plurality of fibers surrounded by a thermoplastic resin material. The method may also include positioning the plate assembly relative to a mold defining a mold surface, wherein the mold surface is shaped so as to correspond to at least one blade parameter of the wind turbine rotor blade. In addition, the method may include applying pressure to the plate assembly via the mold such that at least a portion of the plate assembly conforms to the shape of the mold surface.