Segmented Rotor Blade Shear Web Insert Installation
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Solution Overview
Problem
Longer rotor blades in wind turbines experience increased deflection forces, leading to fatigue and the risk of blade strike, and conventional tip extensions are costly due to their length and manufacturing challenges.
Innovation Solution
A method for installing a shear web insert between a blade segment and a blade insert in a rotor blade assembly, allowing for horizontal placement and securing with positioning and retention devices to enhance structural integrity and reduce the need for lengthy tip extensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional tip extensions are used to increase rotor blade length, then the rotor blade span is extended, but the extension must be significantly longer than the actual increase needed, leading to prohibitively expensive manufacturing and transportation costs
Solution Approach 1:
The rotor blade is divided into separate segments (blade root segment, blade insert, blade tip segment) that can be manufactured independently and assembled together. The shear web insert is further segmented into multiple portions that can be installed separately between the blade segments, allowing each component to be optimized and manufactured at reasonable cost rather than requiring one extremely long monolithic extension
Solution Approach 2:
The shear web insert portions are nested between the blade segments, with each insert portion positioned within the structural framework of the adjacent blade segments. The positioning devices and retention devices are nested within the blade assembly structure, allowing compact integration without requiring excessive external space or length
2Length of moving object
If conventional tip extensions are used to increase rotor blade length, then the rotor blade span is extended, but the transportation cost becomes prohibitively expensive due to the length of the extension
Solution Approach 1:
The blade extension functionality is achieved through segmented components (blade segments and insert portions) that can be transported separately as shorter, more manageable pieces rather than one extremely long extension, significantly reducing transportation costs and logistical challenges
Solution Approach 2:
Instead of extending the blade in one dimension (length) with a single long component, the invention uses multiple shorter components arranged in a segmented sequence along the blade span, transforming the problem from transporting one long object to transporting multiple shorter objects that can be assembled on-site
3Productivity
If longer rotor blades are used to increase energy output, then the rotor blade span is increased, but deflection forces and fatigue risks increase
Solution Approach 1:
The blade is segmented with intermediate connection points (shear web inserts between blade segments) that can be designed to distribute and manage stresses more effectively along the blade span, potentially reducing fatigue accumulation compared to a monolithic long blade
Solution Approach 2:
The invention allows for optimization of structural parameters (shear web thickness, material properties, connection geometry) at each segment interface to manage stress distribution and reduce deflection forces, enabling longer blades to maintain acceptable fatigue resistance through localized parameter optimization
4Ease of manufacture
If the rotor blade span is increased without excessive lengthening, then manufacturing and transportation costs are reduced, but the structural integrity at the connection points must be maintained
Solution Approach 1:
Positioning devices are installed in advance at precise locations on the blade segments to ensure correct positioning of the shear web insert portions during assembly. Retention devices are pre-configured to secure the inserts, ensuring structural integrity is maintained from the moment of assembly without requiring complex real-time alignment procedures
Solution Approach 2:
The shear web insert portions act as intermediary structural elements between the blade segments, transferring and distributing loads across the connection interfaces. The positioning and retention devices serve as intermediaries during assembly, mediating the connection process to ensure proper alignment and secure attachment, thereby maintaining structural integrity
Data Source
AI summary
A method for installing a shear web insert between a blade segment and a blade insert of a rotor blade assembly is disclosed. The blade segment may include a first shear web and the blade insert may include a second shear web. The method may generally include coupling a first positioning device along an inner surface of a first side of the rotor blade assembly, inserting the shear web insert horizontally between the first and second shear webs until a first side face of the shear web insert engages the first positioning device and coupling a first retention device along the inner surface of the first side of the rotor blade assembly so that the first retention device is positioned adjacent to a second side face of the shear web insert, wherein the second side face is opposite the first side face.