Deformable Slat Fairing for Aircraft Noise Reduction
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Solution Overview
Problem
Current leading edge devices, such as slats, generate noise due to airflow over their inner surfaces during takeoffs and landings, and existing noise reduction solutions like leading edge flaps compromise lift.
Innovation Solution
A deformable fairing made of shape memory alloy or other materials is attached to the leading edge device, changing shape between deployed and undeployed positions to cover the inner surface, reducing undesirable airflow and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a leading edge flap is used to reduce noise, then noise generation is reduced, but lift generation is reduced
Solution Approach 1:
The fairing is made deformable using shape memory alloy material that can dynamically change its shape between deployed and undeployed positions. When the leading edge device is deployed, the fairing deforms to cover the inner surface and reduce noise. When retracted, the fairing moves away to minimize interference with lift generation. This dynamic adaptation resolves the contradiction between noise reduction and lift maintenance.
Solution Approach 2:
The shape memory alloy fairing changes its physical state and shape parameters in response to temperature or stress changes. During deployment, the fairing transitions to a deformed state that covers the inner surface for noise reduction. During retraction, it returns to its original shape, changing parameters to minimize impact on aerodynamic performance and lift generation.
2Object-affected harmful factors
If a fixed fairing covers the inner surface, then noise is reduced, but device complexity increases
Solution Approach 1:
The shape memory alloy fairing is self-actuating and does not require external actuators, motors, or control systems. It automatically deforms and returns to its original shape based on its material properties and the position of the leading edge device. This self-service capability reduces device complexity while maintaining noise reduction functionality.
Solution Approach 2:
The patent extracts the actuation function from the fairing system by using the inherent shape memory properties of the material itself, rather than adding separate actuation mechanisms. This removes complex mechanical components while retaining the ability to change fairing shape for noise reduction.
3Productivity
If the fairing is made deformable to adapt to position changes, then aerodynamic performance is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The shape memory alloy fairing uses material property changes rather than precise mechanical positioning. The material's inherent shape memory characteristics allow it to achieve the required aerodynamic shape through parameter changes in temperature or stress, reducing the need for high-precision manufacturing and assembly tolerances.
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 deformable fairing reduces noise generation while maintaining or enhancing lift by altering airflow patterns over the leading edge device, improving performance during critical flight phases.
Implementation Method 1
The deformable fairing is comprised of a shape memory alloy
Data Source
AI summary
A method for managing a flight control surface system. A leading edge device is moved on a leading edge from an undeployed position to a deployed position. The leading edge device has an outer surface, an inner surface, and a deformable fairing attached to the leading edge device such that the deformable fairing covers at least a portion of the inner surface. The deformable fairing changes from a deformed shape to an original shape when the leading edge device is moved to the deployed position. The leading edge device is then moved from the deployed position to the undeployed position, wherein the deformable fairing changes from the original shape to the deformed shape.