Acoustic Treatment Panel With Multi-Conduit Cells for Low-Frequency Noise
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Solution Overview
Problem
Existing acoustic treatment panels for aircraft nacelles are inadequate in attenuating low-frequency noise and maintaining structural integrity, as they lack effective soundwave attenuation and compression resistance at low frequencies.
Innovation Solution
The acoustic treatment panel incorporates a cellular structure with multiple conduits, each having a large cross-sectional area ratio to the cell, with a porous acoustically resistive layer at one end and a reflective layer at the other, featuring small cross-sectional conduits and strategically positioned openings to enhance soundwave attenuation and structural reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional acoustic treatment panel with single conduit per cell is used, then the structure is simple, but the low-frequency soundwave attenuation is insufficient
Solution Approach 1:
The patent divides each cell into multiple conduits (at least two conduits per cell) instead of using a single conduit. This segmentation increases the surface area for soundwave interaction and improves low-frequency attenuation without making the overall structure overly complex.
Solution Approach 2:
The patent introduces a new dimensional parameter by specifying that conduits must be positioned at specific distances from the porous acoustically resistive layer (between 0.01m and 0.05m). This spatial arrangement in the third dimension enhances soundwave attenuation effectiveness.
2Ease of manufacture
If the acoustic treatment panel lacks sufficient compression resistance, then manufacturing is easier, but structural integrity under compression is compromised
Solution Approach 1:
The patent employs a composite structure combining porous acoustically resistive layers, reflective layers, and rigid conduit elements. This composite design provides both acoustic functionality and enhanced compression resistance, with the rigid conduits acting as structural reinforcement within the cellular structure.
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 design significantly improves soundwave attenuation at low frequencies and increases the compression resistance of the acoustic treatment panel, effectively reducing noise nuisance and maintaining structural integrity.
Implementation Method 1
Such a panel works on the Helmholtz resonator principle. Thus, the cellular structure comprises a plurality of cells, each of which forms an approximately fluid-tight cavity
Implementation Method 2
a porous acoustically resistive layer in contact with an external environment through which sound waves travel
Data Source
AI summary
An acoustic treatment panel in which each cell includes a plurality of conduits which extend from the porous acoustically resistive structure to the reflective layer of the acoustic treatment panel, each conduit including at least one opening set away from the porous acoustically resistive structure and configured to cause the inside and the outside of the conduit to communicate.