Wind Turbine Blade Root Metal Insert for Load Transfer
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Solution Overview
Problem
The existing wind turbine blades face issues with load transfer from the fibre composite structure of the root region to the hub, leading to insufficient support and potential failure, especially with longer and heavier blades, due to insufficient retention of bushings in the composite material.
Innovation Solution
A wind turbine blade design featuring a partly cylindrical metal insert embedded in the root region, which is bonded or laminated into the composite material, providing enhanced rigidity and allowing for a smaller root diameter, along with the option of embedding fastening means within the insert before or after embedding it in the polymer matrix, and using metal fibres or wires for improved retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of bolts and bushings is increased to handle given loads, then the load transfer capability is improved, but the remaining area of fibre composite material between bushings is reduced, resulting in insufficient support and potential connection failure
Solution Approach 1:
The invention replaces traditional glass fibre inserts with metal inserts (steel, aluminum, or other metals) in the root region of the wind turbine blade. These metal inserts provide superior mechanical properties including higher strength, stiffness, and load-bearing capacity compared to glass fibre composites. The metal inserts are embedded in the blade root and provide threaded bores for fastening means, enabling reliable load transfer from the blade to the hub while maintaining sufficient composite material area between fastening points.
2Power
If long and heavy blades are used to increase energy production, then the power output is improved, but the root connection becomes insufficiently supported, leading to potential failure due to inadequate retention of bushings
Solution Approach 1:
The invention changes the material parameter of the inserts from glass fibre composite to metal materials with superior mechanical properties. This parameter change provides significantly higher tensile strength, shear strength, and retention characteristics, enabling the root connection to reliably support longer and heavier blades that generate higher power output.
3Length of moving object
If a smaller root diameter is used to enable longer blades, then the blade length is increased, but the structural support in the root region is reduced, compromising connection strength
Solution Approach 1:
The metal inserts provide high strength-to-weight ratio and superior mechanical properties that allow the root region to maintain connection strength even with reduced root diameter. The metal material's inherent strength compensates for the smaller cross-sectional area, enabling longer blades to be connected reliably to the hub.
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
This design enhances the rigidity of the root region, allowing for the use of smaller root diameters and longer blades while improving the retention of the insert and fastening means within the composite material, thereby addressing the issue of load transfer and connection reliability.
Implementation Method 1
an at least partly cylindrical metal insert is at least partially embedded in the root region... which is bonded or laminated into the composite material
Implementation Method 2
which is bonded or laminated into the composite material
Implementation Method 3
using metal fibres or wires for improved retention
Data Source
AI summary
A wind turbine blade for a wind turbine is a shell structure of a fiber-reinforced composite and comprises a root region and an airfoil region. The root region has a ring-shaped cross section and comprises a cylindrical insert 7 embedded in the fiber-reinforced polymer so as to substantially follow the circumference of the root region. The cylindrical insert is provided with a number of mutually spaced threaded bores 12, 15 in a first end 9 thereof being accessible from the outside.