Shear Thickening Fluid Stabilizes Inflatable Wing Flutter
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Solution Overview
Problem
Foldable and inflatable aircraft wings face stability issues during flight due to high frequency aeroelastic fluttering movements, which are not adequately addressed by existing technologies.
Innovation Solution
Incorporating a shear thickening fluid in sealed compartments within a frame structure of the aircraft components, such as wings, which exhibits decreasing viscosity under impact forces, providing reinforcement and stability against fluttering movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If foldable and inflatable wings are used to facilitate compact stowage and ease of operation, then the ease of operation is improved, but the stability of the aircraft structure deteriorates due to high frequency aeroelastic fluttering movements
Solution Approach 1:
The patent applies parameter changes by utilizing a shear thickening fluid whose viscosity dynamically changes in response to shear rate variations. During fluttering movements, the fluid's viscosity increases to provide structural reinforcement and stabilize the wing, while during normal operation and stowage, the fluid maintains low viscosity to preserve flexibility and ease of operation. This dynamic parameter change resolves the contradiction between stability during flight and ease of stowage.
Solution Approach 2:
The patent implements dynamics by incorporating a shear thickening fluid that automatically adjusts its rheological properties based on the mechanical state of the wing. The fluid transitions from a viscous state during quiet operation to a rigid state during high-frequency fluttering, providing active stabilization without external control systems. This dynamic adaptation allows the wing to maintain both flexibility for stowage and rigidity for flight stability.
2Stability of the object's composition
If the body of an aircraft is made relatively long to facilitate flight stability, then the stability is improved, but the ease of operation deteriorates due to reduced road maneuverability and parking capability
Solution Approach 1:
The patent applies segmentation by dividing the wing structure into multiple sealed compartments, each filled with shear thickening fluid. This segmentation allows the wing to be folded into compact sections for road vehicle mode while maintaining the ability to extend to a full-span stable configuration for flight mode. The segmented structure with fluid-filled compartments enables both compact stowage and flight stability.
3Stability of the object's composition
If shear thickening fluid is used to stabilize high frequency aeroelastic fluttering movements, then the stability is improved, but the device complexity increases due to the need for sealed compartments and fluid integration
Solution Approach 1:
The patent applies universality by designing the sealed compartments to serve multiple functions: they provide structural reinforcement through shear thickening fluid during fluttering, maintain aerodynamic shape during flight, and allow compact folding during stowage. The frame structure and compartments are integrated into the existing wing design, eliminating the need for separate stabilization systems and reducing overall 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
The use of shear thickening fluid stabilizes high frequency aeroelastic fluttering movements, enhancing the rigidity and stability of foldable and inflatable aircraft components, thereby improving flight stability while maintaining compact stowage capabilities.
Implementation Method 1
A shear thickening fluid is disposed in at least one of the plurality of sealed compartments, the shear thickening fluid exhibiting a decreasing viscosity responsive to an impact force
Data Source
AI summary
A reinforced, foldable component for an aircraft is provided, configured to stabilize a high frequency aeroelastic fluttering movement. The reinforced component may include a frame structure defining at least one air chamber, and a plurality of sealed compartments. A shear thickening fluid is disposed in at least one of the sealed compartments, exhibiting a decreasing viscosity responsive to an impact force. The frame structure may define one of an inflatable wing structure, a fairing structure, an aileron structure, and a stabilizer structure, and the like. The foldable component may include an exterior layer with an exterior surface exposed to an external environment and an interior layer adjacent the at least one air chamber, wherein the plurality of sealed compartments are disposed between the exterior layer and the interior layer. The exterior layer or the interior layer may include an impact-resistant fabric layer including a shear thickening material.