Flexible Wind Blade Root Bulkhead Flange Ovalization
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Solution Overview
Problem
Wind turbine blades experience significant ovalization, leading to potential damage at the blade root and bulkhead connection, with existing rigid attachment methods prone to failure, additional material costs, and secondary sealing issues.
Innovation Solution
A flexible flange made of layered materials such as epoxy resin, biaxial glass, and a rim structure that absorbs forces and maintains a durable seal between the blade root and bulkhead, eliminating the need for secondary seals and additional material, while being resistant to rot and oil damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid bulkhead attachment is used to ensure structural support, then the blade root and bulkhead connection strength is improved, but the damage to the attachment joint from ovalization increases
Solution Approach 1:
The bulkhead attachment transitions from a rigid static connection to a dynamic flexible connection that can adapt to ovalization movements. The flexible flange material allows the bulkhead to move with the blade root during ovalization while maintaining attachment, preventing joint damage.
Solution Approach 2:
The attachment method changes from rigid to flexible by altering the physical parameters of the connecting material. The flexible flange material has different stiffness and elasticity parameters compared to rigid connections, allowing it to accommodate ovalization-induced deformations without failing.
2Strength
If steel rods or composite brackets are used to connect the bulkhead to the blade root, then the connection strength is improved, but the device complexity and maintenance requirements increase
Solution Approach 1:
The flexible flange integrates multiple functions into a single component: structural attachment, sealing, and accommodation of ovalization movement. This eliminates the need for separate steel rods, composite brackets, and secondary sealing systems, reducing overall device complexity.
Solution Approach 2:
The flexible flange serves multiple purposes simultaneously: it provides structural connection between the bulkhead and blade root, seals the interface to prevent debris ingress, and accommodates ovalization-induced movements. This multi-functionality replaces multiple specialized components.
3Force
If the bulkhead is rigidly attached to the blade wall to resist high loads, then the resistance to ovalization forces is improved, but the cost of additional material and risk of joint failure increase
Solution Approach 1:
The flexible flange uses a thin flexible material to resist ovalization forces, replacing the need for thick rigid reinforcements. The flexible material distributes and absorbs forces through elastic deformation, achieving force resistance with minimal material thickness and cost.
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
The flexible flange provides cost-effective stress relief and sealing, preventing damage from ovalization and unwanted pollution, and supports the blade root and bulkhead without requiring extra material or secondary sealing, ensuring durability and reliability.
Implementation Method 1
A flexible flange made of layered materials such as epoxy resin, biaxial glass, and a rim structure that absorbs forces
Data Source
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AI summary
A flexible flange (300) for a blade root wall (302) allows movement of the blade root (209) toward and away from the bulkhead (304). The flexible flange provides flexibility and support for the blade wall and also provides a sealant, thereby protecting the machinery in the hub (110). The flexible flange has a top portion (306) configured to be secured to a blade root wall, a bottom portion (310) configured to be secured to a bulkhead (304) and an angled portion (308) configured to offset the top portion from the bottom portion, a gap (312) being between the blade root wall and the bottom portion to allow for movement of the blade root wall toward and away from the bulkhead.