Diffraction Sound-Absorbing Panel Structure for Thin Acoustic Layers
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Solution Overview
Problem
Conventional sound-absorbing members require thick air layers for effective sound absorption, limiting the reduction of panel thickness and weight.
Innovation Solution
A sound-absorbing member employing a diffraction principle with slits and vented chambers that induce and contain diffracted waves, allowing for reduced thickness by converting sound energy into thermal energy through friction and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional linear sound absorption principle is used, then sound absorption effect is achieved, but panel thickness cannot be reduced
Solution Approach 1:
The patent transitions from linear sound wave propagation (one-dimensional approach) to diffraction-based sound absorption (two-dimensional approach). By introducing vents and chambers that utilize diffraction, the sound absorption mechanism operates in a different dimensional paradigm, allowing effective absorption with reduced panel thickness compared to conventional linear absorption structures.
Solution Approach 2:
The patent changes the fundamental parameter of sound wave interaction from linear transmission to diffraction. By adjusting the geometry, orientation, and distribution of vents and chambers, the patent optimizes diffraction effects to achieve effective sound absorption with thinner panel configurations, thereby changing the operational parameters of the sound absorption system.
2Reliability
If thick air layer is used for sound absorption, then sound absorption performance is improved, but panel thickness and weight increase
Solution Approach 1:
The patent extracts the essential function of sound absorption from the thick air layer configuration and relocates it to a diffraction-based vent and chamber system. By removing the dependency on thick air layers, the patent achieves sound absorption performance with significantly reduced material usage and lower panel weight.
Solution Approach 2:
The patent replaces the mechanical system of thick air layer absorption with a diffraction-based system using vents and chambers. This substitution eliminates the need for heavy air layer materials while achieving equivalent or superior sound absorption performance through acoustic diffraction phenomena.
3Reliability
If conventional linear sound absorption structure is used, then sound absorption is achieved, but device complexity and material usage increase
Solution Approach 1:
The patent segments the sound absorption function into discrete vent and chamber elements distributed across the panel surface. This segmentation allows for modular design and simplified manufacturing compared to monolithic thick air layer structures, while maintaining effective sound absorption through the collective diffraction action of the segmented elements.
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
Achieves significant reduction in thickness while maintaining effective sound absorption by utilizing the diffraction principle, enhancing sound absorption performance and frequency bandwidth.
Implementation Method 1
vented chambers which induce and contain diffracted waves from sound incident thereon from said slits
Implementation Method 2
converting sound energy into thermal energy through friction and vibration
Implementation Method 3
converting sound energy into thermal energy through friction and vibration
Data Source
AI summary
The sound-absorbing member (1) has a front face portion (2) toward a sound source and having an X-Y plane, and a back face portion (4) arranged such that a backside air layer (3) having a thickness in a Z direction intervenes between the back face portion and said front face portion (2); wherein, at the front face portion (2), a plurality of slits (5) that communicate with the backside air layer (3) and that are of prescribed lengths are provided at prescribed spacings, and vented chambers (6) which induce and contain diffracted waves from sound incident thereon from said slits (5) are provided so as to lie in the X-Y plane and have prescribed thicknesses in the Z direction.