Composite Panel Impact Resistance and Drainage
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Solution Overview
Problem
Current composite panels used in aircraft interiors for sound insulation and drainage are not effective in withstanding low velocity impact tests and suffer from inadequate drainage, especially in horizontal installations, leading to water accumulation and potential corrosion.
Innovation Solution
A composite panel design featuring a first core layer with mechanical rigidity and a second impact-absorbing core layer with specific cell width and drainage capabilities, combined with ventilation holes and slots for improved drainage, while maintaining sound insulation and electromagnetic shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a composite panel uses lightweight glass fiber/carbon fiber prepregs for sound insulation and drainage, then gas permeability and drainage are improved, but impact resistance deteriorates
Solution Approach 1:
The patent uses a composite structure combining a honeycomb core layer (providing mechanical strength and rigidity) with glass fiber/carbon fiber prepreg cover layers (providing drainage and gas permeability). This composite material approach allows the panel to simultaneously achieve both drainage capability and impact resistance that neither material could provide alone.
Solution Approach 2:
The panel is divided into functionally distinct layers: a honeycomb core layer for structural support and impact absorption, and permeable cover layers for drainage. This segmentation allows each layer to optimize its specific function while contributing to overall panel performance.
2Strength
If the core layer cells are completely closed to provide mechanical rigidity, then strength is improved, but drainage capability deteriorates
Solution Approach 1:
The cover layers are designed with locally varied properties: they are permeable in regions requiring drainage (allowing water passage) while maintaining structural integrity in regions requiring strength. The honeycomb core provides rigid support while the cover layers provide selective permeability for drainage functions.
3Weight of moving object
If the specific weight is reduced to meet aircraft interior requirements (950-1150 g/m2), then weight is improved, but impact resistance deteriorates
Solution Approach 1:
The patent employs thin, lightweight glass fiber and carbon fiber prepreg layers that provide sufficient structural strength and impact resistance while maintaining low weight. These thin film structures achieve high strength-to-weight ratios essential for aircraft applications.
Solution Approach 2:
The combination of honeycomb core with lightweight fiber-reinforced plastic cover layers creates a composite structure that achieves both low specific weight (within 950-1150 g/m2) and adequate impact resistance for aircraft interior applications.
4Reliability
If a draining layer covers the core layer cells to improve drainage, then drainage capability is improved, but impact resistance deteriorates
Solution Approach 1:
The panel structure segments drainage functions (handled by permeable cover layers) from structural functions (handled by honeycomb core). This segmentation allows the draining layer to be integrated into the cover layers without compromising the core's impact resistance capability.
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 effectively withstands low velocity impact tests, ensures efficient drainage in all installation positions, and maintains low specific weight and mechanical rigidity, addressing the issues of water accumulation and impact resistance.
Implementation Method 1
a second core layer (18) with a plurality of cells that are separated from one another by walls at least in certain areas is arranged on the first cover layer (16) and the first core layer (12)
Implementation Method 2
the upper side of this second core layer (18) features/covers at least one draining layer
Data Source
AI summary
The invention pertains to a composite panel with a first cover layer, a second cover layer and a first core layer that is arranged between the first cover layer and the second cover layer and features a plurality of cells that are separated from one another by walls at least in certain areas, wherein the first cover layer features a draining layer. The inventive composite panel may be distinguished from a composite panel according to the state of the art in that a second core layer with a plurality of cells that are separated from one another by walls at least in certain areas is arranged between the first cover layer and the first core layer.