Aircraft Seat Noise Attenuation Panel With Perforated Cavity Structure
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Solution Overview
Problem
Noise interference within aircraft cabins poses a challenge for passenger comfort, as existing seat units fail to effectively reduce noise levels without compromising living space.
Innovation Solution
A seat unit equipped with a noise attenuating panel featuring a sound-permeable support plate with through holes and a layer of sound-absorbing material, creating a compact sound trap that reduces noise intensity by allowing sound waves to pass into an empty space for multiple reflections, thereby minimizing perceived noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional solid panels are used to reduce noise, then noise attenuation is improved, but living space is reduced
Solution Approach 1:
The support plate is designed with through-holes creating a porous structure that allows sound waves to pass through and be absorbed by the sound-absorbing material in the empty space, while the plate itself remains acoustically effective. This porous design attenuates noise without requiring a solid barrier that would occupy valuable living space.
Solution Approach 2:
The noise attenuating panel is integrated within the existing environmental element structure, with the support plate positioned in front of the environmental element face. The panel nests within the available space, utilizing the empty space between the support plate and the environmental element face as the sound-absorbing cavity, thereby reducing noise without expanding the overall footprint or reducing living space.
2Object-affected harmful factors
If thick sound-absorbing materials are used, then noise attenuation is improved, but device complexity and space consumption increase
Solution Approach 1:
The noise attenuation function is segmented into multiple components: the support plate with through-holes, the sound-absorbing material layer, and the empty space cavity. This segmentation allows each component to contribute to noise attenuation in a distributed manner, achieving effective noise reduction without requiring a single thick material layer that would increase complexity and space consumption.
Solution Approach 2:
The invention utilizes the third dimension by creating an empty space cavity behind the support plate. Sound waves pass through the through-holes and are absorbed in this depth dimension, allowing effective noise attenuation without increasing the frontal area or requiring thick materials in the forward direction. This dimensional approach reduces overall device complexity while maintaining noise attenuation performance.
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 noise attenuating panel significantly reduces noise intensity across a range of frequencies, enhancing acoustic comfort for passengers without reducing living space, by utilizing a combination of sound-permeable materials and strategically designed perforations in the support plate.
Implementation Method 1
the through holes allow the passage of sound waves into the empty space separating the support plate from the environmental element of the seat, so that after multiple reflections inside this space the noise intensity perceived by the passenger in the seat is greatly reduced
Implementation Method 2
a layer of sound absorbing material between the covering cap and the support plate
Data Source
AI summary
The invention relates to a seat unit including a seat, at least one surrounding element associated with the seat, and a noise attenuation panel fixed to one face of the surrounding element. The noise attenuation panel can include a soft trim cover, and a support plate comprising at least one sound-permeable portion provided with at least one through hole. The support plate can be arranged such that there is an empty space between said sound-permeable portion and the face of the surrounding element of the seat.