Assembly Fixture with Inflatable Bladders for Rotor Blade Bonding
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Solution Overview
Problem
Challenges exist in achieving strong, load-bearing bonds between rotor blade segments of wind turbines, particularly in maintaining internal pressure during the bonding process to ensure proper alignment and aerodynamic performance.
Innovation Solution
A method using an assembly fixture with an outer carrier, inner carrier, and inflatable bladders to apply pressure at the joint, displacing adhesive between blade segments, ensuring secure bonding and alignment without additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If internal pressure is applied during bonding to ensure proper alignment and strong bonds, then bonding strength and alignment are improved, but achieving and maintaining the required internal pressure becomes difficult
Solution Approach 1:
A bladder is introduced as an intermediary element between the blade segments at the joint. The bladder is positioned within the joint cavity and, when inflated, applies distributed internal pressure to the bonding surfaces. This mediator enables effective pressure application without requiring complex external pressuring equipment, thus improving bonding strength while maintaining operational simplicity.
2Ease of manufacture
If blade segments are manufactured separately to reduce transportation costs, then manufacturing and transportation costs are reduced, but achieving precise alignment and strong bonds at joints becomes more challenging
Solution Approach 1:
Adhesive is applied to the bonding surfaces of the blade segments before assembly. This preliminary action ensures that when the segments are brought together at the joint, the adhesive is already in position to create a strong bond. Combined with the bladder-induced pressure during bonding, this preliminary preparation facilitates precise alignment and strong joints while maintaining the benefits of separate manufacturing.
3Strength
If adhesive is used to join blade segments, then bond strength is improved, but proper displacement and distribution of adhesive at the joint becomes difficult to control
Solution Approach 1:
A bladder inflated with gas or liquid is used to apply controlled pressure to the adhesive at the joint. The pneumatic or hydraulic pressure forces the adhesive to displace and distribute uniformly across the bonding surfaces. This enables precise control of adhesive distribution and ensures complete coverage and proper bonding, while maintaining strong adhesive bonds between the blade segments.
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
Facilitates robust and efficient joining of rotor blade segments with precise alignment, reducing the need for costly equipment and improving aerodynamic performance.
Implementation Method 1
inflating the at least one bladder to provide pressure to the at least one joint
Data Source
AI summary
A method for joining rotor blade segments of a rotor blade includes placing a first blade segment in an assembly fixture. The assembly fixture has an outer carrier and at least one bladder arranged with the outer carrier. The first blade segment has an adhesive applied at one or more locations. The method also includes arranging the first blade segment with a second blade segment at at least one joint using the assembly fixture with the adhesive positioned at the at least one joint. Further, the method includes inflating the at least one bladder to provide pressure to the at least one joint, wherein the pressure causes the adhesive to displace between the first and second blade segments at the at least one joint, thereby securing the first and second blade segments together at the at least one joint. Moreover, the method includes maintaining the pressure via the at least one inflated bladder to allow the adhesive to cure, thereby securing the first and second blade segments together.