Thermoplastic Wind Turbine Blade Segments Ultrasonic Welding
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Solution Overview
Problem
Conventional wind turbine rotor blades face issues with bond line failures, complex and labor-intensive manufacturing processes, and increased weight due to complex joint designs in segmented blades, which affect their structural integrity and assembly efficiency.
Innovation Solution
The method involves constructing modular rotor blades using a combination of thermoset and thermoplastic materials, with fiber reinforcement, and employing improved assembly techniques such as welding and adhesive bonding at interfaces between blade segments and the main structure, along with pre-forming and infusing thermoplastic layers to simplify the assembly process and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding methods are used to join rotor blade segments, then the blade structure can be assembled, but the bond lines become critical failure points with high complexity and labor intensity
Solution Approach 1:
The patent replaces conventional mechanical bonding methods (bonding paste application, bonding tools) with ultrasonic welding technology. The ultrasonic welding device uses high-frequency vibration to melt and fuse thermoplastic materials at the joint interface, eliminating the need for bonding paste and complex bonding procedures. This substitution reduces joint design complexity while improving reliability by creating a more robust weld connection that is less prone to failure.
Solution Approach 2:
The patent changes the material parameter from thermoset to thermoplastic at the joint interface. By using thermoplastic materials that can be ultrasonic welded, the patent enables a different joining mechanism that is simpler and more reliable. The parameter change in material type allows for direct welding without intermediate bonding agents, reducing complexity and improving bond line reliability.
2Ease of manufacture
If segmented blade design is used to reduce manufacturing complexity, then assembly becomes possible, but the joints and related parts increase the overall weight
Solution Approach 1:
The patent merges the joint connection function with the structural skin itself by using ultrasonic welding to fuse thermoplastic layers directly at the interface. This integration eliminates the need for separate, heavy joint components and fasteners. The weld creates a unified structure where the joint is as lightweight as the surrounding material, maintaining manufacturing ease while significantly reducing the weight penalty associated with conventional segmented blade joints.
3Manufacturing precision
If conventional bonding paste methods are used, then bond lines can be formed, but the process is labor intensive and prone to defects
Solution Approach 1:
The patent replaces the manual bonding paste application process with automated ultrasonic welding. The welding device uses programmed motion to precisely position and weld joints along the blade segments, eliminating manual paste application and reducing human error. This automation improves manufacturing precision by ensuring consistent weld quality while increasing productivity through faster, continuous welding operations compared to manual bonding processes.
4Ease of manufacture
If large blade halves are manufactured using opposing mold halves, then the entire blade can be formed, but the process becomes highly labor intensive and defect-prone
Solution Approach 1:
The patent divides the blade into smaller segments that can be manufactured independently using standard-sized molds, avoiding the need for large opposing mold halves. Each segment is pre-manufactured with integrated thermoplastic layers at the joint interfaces. This segmentation allows parallel manufacturing of multiple segments, reducing overall production time and labor requirements while maintaining manufacturing ease through standardized mold sizes.
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 enhances the structural integrity and reduces the complexity and weight of rotor blades, improving assembly efficiency and reducing labor and production costs, while providing a more reliable and cost-effective alternative to conventional blades.
Implementation Method 1
The blade segment may then be welded to the main blade structure at the interface
Implementation Method 2
The layers are then typically infused together with a thermoset resin
Data Source
AI summary
The present disclosure is directed to a method of assembling a modular rotor blade of a wind turbine. The method includes identifying a main blade structure, constructed at least in part, from at least one of a thermoset or a thermoplastic material. The method also includes identifying at least one blade segment, constructed at least in part, of a thermoplastic material reinforced with at least one of glass fibers or carbon fibers. Thus, the method also includes securing the at least one blade segment to the main blade structure, e.g. via welding.