Aircraft Soundproofing Trim Panel With Decoupled Walls
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Solution Overview
Problem
Aircrafts face challenges in achieving both acoustic insulation and mechanical strength in soundproofing trim panels, with existing solutions either being costly or resulting in panels with critical frequencies within the audible range, leading to compromised sound comfort and mechanical integrity.
Innovation Solution
A self-supporting trim panel design featuring a visible and invisible wall separated by a porous core, with connecting elements that decouple the walls to enhance mechanical strength while minimizing mass and manufacturing costs, using inexpensive materials and manufacturing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a panel uses composite materials with woven fibers to achieve sufficient rigidity and mechanical strength, then the panel can be self-supporting and meet aircraft certification regulations, but the manufacturing cost increases significantly
Solution Approach 1:
The patent employs a composite structure combining a polymer foam core with a thin polymer skin layer. This composite approach provides sufficient mechanical strength and rigidity while using less expensive materials and simpler manufacturing processes compared to traditional woven fiber composite panels. The foam core provides structural support and the thin skin provides surface integrity, achieving a cost-effective balance between performance and manufacturing complexity.
2Ease of manufacture
If a panel uses inexpensive polymer forming methods without woven fibers to reduce manufacturing cost, then the panel can be produced economically, but the panel mass increases and stiffness decreases
Solution Approach 1:
The patent uses a thin polymer skin (film) that is formed over or bonded to a lightweight foam core. This thin film approach provides the necessary surface integrity and aerodynamic smoothness while minimizing added mass. The foam core provides the primary structural support, allowing the thin skin to be much lighter than traditional solid polymer panels while maintaining stiffness through the composite action of the foam-skin system.
3Strength
If a panel increases thickness to achieve self-supporting characteristics using inexpensive materials, then the panel gains mechanical strength, but the mass increases significantly
Solution Approach 1:
The patent segments the panel into two functional components: a foam core that provides structural support and rigidity, and a thin polymer skin that provides surface integrity and aerodynamic properties. This segmentation allows each component to be optimized independently - the foam core can be engineered for maximum stiffness-to-weight ratio while the thin skin minimizes mass. The combined structure achieves self-supporting characteristics without the excessive mass that would result from using a single thick polymer panel.
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 panel achieves effective acoustic insulation, particularly at high frequencies, while maintaining mechanical strength and reducing mass, thus optimizing sound comfort and manufacturing efficiency.
Implementation Method 1
a porous core arranged between the first wall and the second wall
Implementation Method 2
each connecting element having the function of separating the visible wall from the invisible wall and of mechanically linking the visible wall and the invisible wall by acoustically decoupling the visible wall and the invisible wall
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present invention relates to a self-supporting, acoustically insulating panel (1) comprising a visible (3) non-self-supporting wall and an invisible (2) non-self-supporting wall facing a sound wave source (50). A porous core (20) is arranged between the visible wall (3) and the invisible wall (2), a plurality of connecting elements (5) each extending from the invisible wall (2) to the visible wall (3), each connecting element (5) passing through an orifice (21) of said core (20) and being connected to the visible wall (3) and the invisible wall (2), each connecting element (5) separating the visible wall (3) from the invisible wall (2) and mechanically linking the visible wall (3) and the invisible wall (2) while acoustically decoupling the visible wall (3) and the invisible wall (2).