Wind Turbine Blade Fiber Orientation Segmentation
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Solution Overview
Problem
Current wind turbine blade designs face challenges in optimizing fiber orientations to effectively manage varying stress states along the blade, often requiring multiple layers and orientations to balance stiffness and weight, which can lead to inefficiencies and increased costs.
Innovation Solution
The blade design incorporates distinct fiber orientations for different longitudinal stretches based on prevailing stress states, with specific angles for shear and longitudinal stress zones, reducing the number of layers needed while maximizing load-bearing capacity and maintaining low weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple layers with different fiber orientations are used to balance stiffness and weight, then structural performance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The blade is divided into multiple longitudinal stretches along its span, with each stretch having a specific fiber orientation configuration tailored to the local stress state. This segmentation allows optimization of fiber angles in different zones (e.g., root region with higher shear stresses versus tip region with different stress characteristics) without requiring complex multi-orientation stacking throughout the entire blade, thereby reducing manufacturing complexity while maintaining structural performance.
Solution Approach 2:
Different fiber orientations are assigned to different longitudinal stretches of the blade based on the prevailing stress states in each region. The root portion may use orientations optimized for shear loads while the tip portion uses orientations optimized for bending moments. This local quality approach ensures that each section has the optimal fiber configuration for its specific loading conditions, improving structural performance without requiring uniform complex stacking everywhere.
2Strength
If fiber orientations are optimized for each stress zone, then load-bearing capacity is maximized, but the number of fabric layers required increases
Solution Approach 1:
The fiber orientation configuration is made dynamic by varying the fiber angles along the longitudinal span of the blade according to the changing stress state. Instead of using fixed orientations throughout, the blade adapts fiber orientations to match the prevailing loads at each location, maximizing load-bearing capacity while avoiding the need to stack excessive layers uniformly across the entire blade structure.
Solution Approach 2:
The fiber orientation angle is changed as a parameter along the longitudinal direction of the blade. By continuously or discretely varying this parameter from the root to the tip, the structure achieves optimal load-bearing capacity in each zone without requiring an increased number of fabric layers, as each layer's orientation is precisely tuned to the local stress conditions.
3Ease of manufacture
If standard fiber orientations (0°, ±45°, 90°) are used throughout the blade, then manufacturing is simplified, but structural efficiency decreases
Solution Approach 1:
The blade is segmented into longitudinal stretches with different fiber orientation configurations. Each segment can use standard orientations (0°, ±45°, 90°) locally optimized for its stress state, rather than applying a single standard configuration throughout. This segmentation maintains manufacturing simplicity within each zone while improving overall structural efficiency through zone-specific optimization.
Solution Approach 2:
Standard fiber orientations are applied with local quality by selecting which standard angles (0°, ±45°, 90°) to use in each longitudinal stretch based on the prevailing stresses. For example, ±45° may be used predominately in the root where shear stresses are highest, while 0° orientations may be emphasized in the tip where axial loads dominate. This approach maintains manufacturing simplicity by sticking to standard angles while improving structural efficiency through location-specific selection.
Data Source
AI summary
The present invention relates to a blade for a wind turbine comprising at least a longitudinal component comprising at least two longitudinal stretches with fibers at different orientations depending on the location of these stretches along the blade, where the orientation of the fibers in the stretches of the blade is adapted to the prevailing load states in each of the stretches.