Wind Turbine Blade Edge Component for Buckling Resistance
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Solution Overview
Problem
Wind turbine blades face significant challenges in resisting buckling under extreme loads, which can lead to costly failures and downtime, especially as blade sizes increase, making it difficult to achieve certified designs without adding excessive material and increasing costs.
Innovation Solution
The design incorporates a wind turbine blade with a composite sandwich panel aerodynamic shell and a spar system, featuring edge spars with low rigidity edge components made of materials like foam or honeycomb, which are connected to the main shell structure to distribute loads to the blade root, preventing edge buckling and allowing for modular replacement of damaged parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional material and structure are added to meet buckling design margins, then blade buckling resistance is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The blade is divided into a main blade body and a separate edge component that can be attached to the trailing edge. This segmentation allows the main structure to be optimized for strength while the edge component provides localized buckling resistance, avoiding the need to reinforce the entire blade structure.
Solution Approach 2:
The edge component is constructed using composite materials with high stiffness-to-weight ratio, combining materials with different properties to achieve optimal buckling resistance. The composite structure provides enhanced mechanical properties without significantly increasing overall weight or complexity.
2Strength
If additional material and structure are added to meet buckling design margins, then blade buckling resistance is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the blade into a main body and a separate edge component, manufacturing becomes more cost-effective. The edge component can be manufactured independently using optimized processes and then attached to the main blade, reducing overall manufacturing complexity and cost compared to manufacturing a fully reinforced blade as one piece.
Solution Approach 2:
Instead of uniformly reinforcing the entire blade, the invention applies reinforcement only at the trailing edge where buckling is most likely to occur. This localized approach uses material efficiently and reduces manufacturing costs by avoiding unnecessary reinforcement in other areas of the blade.
3Strength
If the blade is designed to prevent any buckling, then buckling resistance is improved, but the blade becomes more vulnerable to catastrophic failure from edge damage
Solution Approach 1:
The invention converts the potential harm of edge buckling into a beneficial benign buckling mechanism. The edge component is designed to buckle in a controlled, predictable manner that prevents catastrophic failure. This benign buckling absorbs energy and prevents the propagation of damage to the main blade structure, thereby improving reliability.
Solution Approach 2:
The edge component is designed as a sacrificial element that can be replaced if damaged. Rather than designing the entire blade to be perfectly resistant to all forms of damage, the invention uses a replaceable edge component that provides protection against catastrophic failure while being economically replaceable if it sustains damage beyond benign buckling.
Data Source
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AI summary
The invention relates to a wind turbine blade comprising an aerodynamic shell that extends between a leading edge and a trailing edge, said shell being comprised of a windward shell and a leeward shell, said shell comprising composite sandwich panels to support localised loading and a spar system to provide local rigidity to the blade and to transfer the accumulated load to the blade root. The blade comprises: [a] an edge spar at either leading edge and trailing edge of the blade; and [b] from said edge spar at either leading edge and trailing edge of the blade, an edge component, having it's leeward surface aligned with and adjacent to said blade's leeward shell, and it's windward surface, aligned with and adjacent to said blade's windward shell, so as to provide a continuous aerodynamic shell; - said edge component having a lower rigidity than the blade's main structure.