Modular Wind Turbine Rotor Blade Assembly With Fewer Bond Lines
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Solution Overview
Problem
Conventional wind turbine rotor blades face issues such as bond-line failures, complex and labor-intensive manufacturing, and alignment challenges in segmented blade assembly, leading to increased costs and susceptibility to defects.
Innovation Solution
A method for assembling modular rotor blades involving pre-formed blade segments with a single joint, secured via adhesives or fasteners, and supported by fixture assemblies to align and mount segments over spar caps, reducing bond lines and complexity while increasing rigidity through shear webs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotor blades are manufactured as single continuous pieces using conventional molding processes, then structural integrity is maintained, but manufacturing complexity and labor intensity increase significantly
Solution Approach 1:
The rotor blade is divided into multiple modular segments that can be manufactured separately using simpler processes and then assembled together. Each segment can be produced independently, reducing the complexity of manufacturing while maintaining the overall structural integrity through designed connection interfaces between segments.
2Productivity
If rotor blades are segmented into multiple sections for easier transport and assembly, then shipping costs and assembly time are reduced, but alignment precision and structural reliability deteriorate
Solution Approach 1:
Connection interfaces with integrated alignment features serve as intermediaries between blade segments. These interfaces include built-in alignment mechanisms such as tapered joints, keyed connections, or guided surfaces that automatically ensure precise alignment during assembly, eliminating the need for complex external alignment procedures while maintaining structural reliability.
3Strength
If multiple bond lines are used to join blade segments, then structural strength is improved, but susceptibility to bond-line failures and defects increases
Solution Approach 1:
The connection interfaces are designed to extract or eliminate the need for traditional bond lines between segments. Instead of relying on adhesive bonding which creates vulnerable bond lines, the design uses mechanical connection methods such as interlocking joints, friction-fit connections, or pinned assemblies that avoid creating continuous bond lines while still providing structural strength and reducing defect susceptibility.
4Reliability
If complex interconnecting components are used in segmented blade joints, then structural reliability is improved, but assembly time and labor requirements increase
Solution Approach 1:
The connection interfaces are designed with self-aligning and self-securing features that allow blade segments to be assembled with minimal intervention. The joints may include self-locking mechanisms, friction-fit surfaces that automatically engage, or gravity-assisted assembly features that reduce the need for complex tools and extensive manual adjustment, thereby maintaining structural reliability while significantly reducing assembly time and labor requirements.
Data Source
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AI summary
The present disclosure is directed to a method 100 for assembling a modular rotor blade 16 of a wind turbine 10. The method includes providing 102 a pre-formed blade root section 20 and a pre-formed blade tip section 22 of the rotor blade 16. Further, the blade root section 20 includes one or more spar caps 48, 50 extending in a generally span-wise direction. Another step 104 includes providing at least one preformed blade segment of the rotor blade 16. The method also includes mounting 106 the at least one blade segment around the one or more spar caps 48, 50 of the blade root section 20, wherein the at least one blade segment includes a chord-wise cross-section having multiple joints, wherein at least one joint is located on at least one of a pressure side surface 31 or a suction side surface 33. In addition, the method also includes joining 108 the blade tip section 22 to at least one of the one or more spar caps 48, 50 or the at least one blade segment.