Acoustic Attenuation Panel One-Piece Design
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Solution Overview
Problem
Conventional acoustic attenuation panels for aircraft propulsion units are heavy, expensive, and poorly suited for small surfaces due to their rigid honeycomb structure and the need for a separate rear skin, which reduces their effectiveness and manufacturing efficiency.
Innovation Solution
An acoustic attenuation panel with an integrally manufactured one-piece design, featuring a perforated front skin and perpendicular partition walls, eliminating the need for a separate rear skin, allowing for easier manufacturing and adaptation to complex shapes, and including discrete fastening supports for improved flexibility and sound attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional acoustic panel with a separate rear skin and honeycomb central structure is used, then the panel provides effective sound attenuation, but the mass and cost of the panel increase
Solution Approach 1:
The patent combines the front skin and central structure into a single integrally manufactured one-piece component. The front skin with perforations and the central structure with partition walls are formed as one unit, eliminating the need for separate assembly of these parts and reducing overall panel mass while maintaining acoustic functionality.
Solution Approach 2:
The patent removes the rear skin from the conventional acoustic panel design. By extracting this component, the panel becomes open at the rear, reducing mass and simplifying manufacturing while the front skin and central structure alone provide sufficient sound attenuation performance.
2Reliability
If a conventional acoustic panel with a separate rear skin and honeycomb central structure is used, then the panel provides effective sound attenuation, but the manufacturing complexity and cost increase
Solution Approach 1:
The front skin and central structure are merged into a single integrally manufactured component, reducing the number of parts from multiple separate components to one unified structure, thereby simplifying manufacturing processes and assembly operations.
Solution Approach 2:
The rear skin is extracted from the panel design, reducing the total number of components that need to be manufactured, assembled, and fastened, thereby reducing manufacturing complexity and cost.
3Area of stationary object
If a conventional acoustic panel with a separate rear skin and chamfered edges is used, then the panel can cover large surfaces, but the panel is poorly adapted to small surfaces and complex shapes
Solution Approach 1:
The patent changes the manufacturing approach from traditional assembly of separate parts to integral manufacturing of the front skin and central structure as one piece. This enables the panel to be produced in various sizes and complex shapes, including small surfaces and aerodynamic contours, without the constraints of assembling multiple components.
Solution Approach 2:
The integrally manufactured panel can be designed with dynamic, complex geometries that adapt to various surface contours. The single-piece construction allows for flexible shaping to match aerodynamic surfaces and complex geometries that would be difficult to achieve with assembled panels.
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 solution reduces the mass and cost of the panels, enhances their adaptability to small and complex surfaces, and maintains effective sound attenuation performance across relevant frequency ranges, while allowing for easier manufacturing and liquid evacuation to prevent accumulation and ignition risks.
Implementation Method 1
The front skin receiving the sound waves has gas passages formed by the perforations, opening into resonant cavities formed by the closed cells of the central structure, in order to constitute Helmholtz resonators carrying out an attenuation of the acoustic emissions originating from the turbojet engine.
Implementation Method 2
an attenuation of the acoustic intensity is obtained for frequency ranges by visco-thermal effect at the level of the perforations of the acoustic skin
Data Source
AI summary
An acoustic attenuation panel for a propulsion assembly includes an acoustic front skin having perforations, and a central structure formed from partitions arranged perpendicularly in order to make up cells, wherein the front skin and the central structure form the panel which is made as a single piece and is provided for directly covering a surface of an element of the propulsion assembly forming a rear skin which closes the cells of the central structure at the rear.