Two-Way Acoustic Panel with Perforated Skins and Cellular Cores
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Solution Overview
Problem
Existing acoustic panels in aircraft fail to adequately attenuate noise from both external and internal sources, limiting their effectiveness in reducing sound levels within the cabin.
Innovation Solution
A wall structure incorporating perforated skins and cellular cores with a fluid-impermeable septum, mounted via vibration-isolating mounts to create additional resonance chambers for enhanced sound attenuation, allowing for two-way sound absorption from both exterior and interior sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional acoustic panels are used in aircraft, then some sound attenuation is provided, but noise from both external and internal sources cannot be adequately attenuated
Solution Approach 1:
The acoustic panel is divided into multiple functional layers including a first cellular core with first cavities, a fluid-impermeable septum, and a second cellular core with second cavities. Each layer is tuned to attenuate sound from different directions (external and internal sources), allowing the panel to address multiple sound attenuation requirements simultaneously and resolve the contradiction between providing sound attenuation and achieving adequate noise reduction from all sources.
2Object-affected harmful factors
If vibration-isolating mounts and additional resonance chambers are added to enhance sound attenuation, then sound insulation is improved, but device complexity increases
Solution Approach 1:
The panel combines multiple functional elements into a single integrated structure: the cellular cores provide both structural support and sound attenuation, the fluid-impermeable septum separates cavities while maintaining structural integrity, and vibration-isolating mounts are integrated at the periphery. This merging of functions reduces the need for separate components and simplifies installation while achieving enhanced sound insulation from both external and internal noise sources.
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
Significantly reduces noise levels within the aircraft cabin by effectively attenuating sound from multiple directions through the use of perforated skins and cellular cores, providing improved sound insulation and passenger comfort.
Implementation Method 1
each acoustic panel (28) includes a first cellular core (58) configured to form one or more first cavities (54) between the first skin (44) and the septum (62)... the first cellular core (58) and the one or more first cavities (54) are operable to attenuate sound generated and/or propagating outside of the fuselage (20)
Implementation Method 2
A wall structure incorporating perforated skins and cellular cores with a fluid-impermeable septum, mounted via vibration-isolating mounts to create additional resonance chambers for enhanced sound attenuation
Implementation Method 3
mounted via vibration-isolating mounts to create additional resonance chambers for enhanced sound attenuation
Data Source
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AI summary
An acoustic panel is provided that includes a first skin, a second skin and a core structure. The core structure is connected to and forms a plurality of cavities between the first skin and the second skin. The cavities include a first cavity and a second cavity. The first cavity is fluidly coupled with one or more first perforations in the first skin. The second cavity is fluidly coupled with one or more second perforations in the second skin.