Aircraft Acoustic Panel Cell Rows for Noise Attenuation
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Solution Overview
Problem
Existing acoustic panels for aircraft propulsion system exhaust sections have limitations in effectively attenuating acoustic energy, indicating a need for improved configurations.
Innovation Solution
The proposed acoustic panel assembly features a unique arrangement of cell rows within an acoustic core, comprising primary and secondary folded sheets that form transverse, longitudinal, and oblique panels, enhancing acoustic attenuation through resonant cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional acoustic panel configurations are used, then manufacturing simplicity is maintained, but acoustic attenuation effectiveness is insufficient
Solution Approach 1:
The acoustic panel is divided into multiple cell rows, each containing multiple cells with specific geometric configurations. This segmentation creates multiple resonant cavities that work together to attenuate acoustic energy across different frequencies, improving overall attenuation effectiveness while maintaining a manufacturable modular structure
Solution Approach 2:
The panel employs cells with varying geometric properties (different panel arrangements, cavity volumes, and configurations) at different locations within the acoustic core. This local variation in cell quality allows the panel to target specific acoustic frequencies and directions, enhancing overall attenuation performance without requiring complete redesign of the entire panel structure
2Object-affected harmful factors
If acoustic panel configurations with improved attenuation are designed, then acoustic energy attenuation is enhanced, but manufacturing complexity increases
Solution Approach 1:
By segmenting the acoustic panel into repeating cell rows with standardized configurations, the design achieves complex acoustic performance through simple, repeatable units. Each cell row contains multiple cells that can be manufactured using the same processes, reducing overall manufacturing complexity despite the enhanced attenuation capability
Solution Approach 2:
Multiple functional elements (acoustic attenuation, structural support, thermal management) are merged into the cell structure itself. The cell walls and panels serve both acoustic and structural purposes, eliminating the need for separate components and simplifying the overall manufacturing process while maintaining effective attenuation
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
This configuration effectively attenuates acoustic energy by creating resonant cavities that dissipate incident acoustic waves, improving noise reduction in aircraft propulsion systems while maintaining ease of manufacture and thermal stability.
Implementation Method 1
This configuration effectively attenuates acoustic energy by creating resonant cavities that dissipate incident acoustic waves
Data Source
AI summary
An acoustic panel assembly includes an acoustic panel including an acoustic core arranged along a transverse direction and a longitudinal direction. The acoustic core extends between and to an inner core side and an outer core side. The acoustic core includes a plurality of cell rows distributed transversely. Each cell row of the plurality of cell rows includes a plurality of cells distributed longitudinally along the respective cell row of the plurality of cell rows. Each cell of the plurality of cells includes a first transverse panel, a second transverse panel, a first longitudinal panel, a second longitudinal panel, and an oblique panel extending between the inner core side and the outer core side. Each cell row of the plurality of cell rows includes a primary folded sheet and a secondary folded sheet. Each of the primary folded sheet and the secondary folded sheet forms the first transverse panel, the first longitudinal panel, and the second longitudinal panel for each cell of the plurality of cells.