Bladder-Assisted Adhesive Joining for Composite Rotor Blades
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Solution Overview
Problem
The existing methods for joining composite rotor blade segments face challenges due to hydraulic resistance from excessive adhesive, leading to misalignment and reduced strength of the composite component.
Innovation Solution
A method involving a bladder assembly is employed to join rotor blade segments by positioning an adhesive element in a first position, defining an inner cavity with a second segment, and inflating the bladder assembly to apply force to the adhesive element, causing it to move and cure in a position that secures the segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If excessive adhesive is used to join rotor blade segments, then bonding strength is improved, but hydraulic resistance increases causing misalignment and reduced manufacturing precision
Solution Approach 1:
The adhesive is applied in advance to a first blade segment and allowed to partially cure or set before the second blade segment is positioned. This preliminary action allows the adhesive to gain initial strength while minimizing hydraulic resistance during alignment, thereby achieving both strong bonding and precise alignment without the contradiction of using excessive adhesive.
2Productivity
If adhesive element is positioned in advance, then manufacturing efficiency is improved, but alignment precision deteriorates due to hydraulic resistance
Solution Approach 1:
The adhesive element is positioned on the first blade segment in advance and allowed to partially cure before final assembly. This preliminary positioning maintains manufacturing efficiency while the partial curing process reduces hydraulic resistance, enabling precise alignment when the second blade segment is positioned without sacrificing alignment precision.
3Manufacturing precision
If bladder assembly is used to apply force to adhesive element, then alignment precision is improved, but device complexity increases
Solution Approach 1:
A bladder assembly is positioned within the inner cavity to apply controlled pneumatic or hydraulic force to the adhesive element during curing. This allows precise control of the force applied to maintain alignment between blade segments, achieving high alignment precision through fluid pressure control while the bladder assembly can be removed or collapsed after curing, limiting the increase in permanent device complexity.
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 method effectively eliminates hydraulic resistance, ensuring precise alignment and strong bonding of rotor blade segments without the need to overcome adhesive resistance, thereby enhancing the strength and serviceability of the composite component.
Implementation Method 1
inflating the bladder assembly to apply a force to the adhesive element
Implementation Method 2
allowing the adhesive element to cure so as to secure the first blade segment to the second blade segment
Data Source
AI summary
Methods are provided for joining a composite component, such as a rotor blade of a wind turbine. Accordingly, a first blade segment is provided and a bladder assembly is positioned thereon. Additionally, an adhesive element is positioned in a first position on the first blade segment. A second blade segment is positioned with the first blade segment so as to define an inner cavity therebetween. The inner cavity contains the adhesive element and the bladder assembly, but the adhesive element does not contact the second blade segment while in the first position. The bladder assembly is inflated to transition the adhesive element to a second position in contact with both the first blade segment and the second blade segment. With the adhesive element in contact with both blade segments, the adhesive element is allowed to cure in order to secure the blade segments to one another.