Sound Absorbing Panel Corner Reinforcement for Diffraction Reduction
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Solution Overview
Problem
Conventional soundproof wall equipment experiences significant sound pressure differences between the sound source side and the back surface, leading to diffraction phenomena at the upper end edge, where high-frequency sound is not effectively reduced by existing edge effect suppression technologies using acoustic materials within metal frames.
Innovation Solution
A sound absorbing panel is designed with an outer frame body containing a first acoustic material and a second acoustic material above the upper end, where the second material's peripheral surface is covered by an air-permeable member except for the corner portion, and reinforcement is provided at the corner to enhance air permeability and stability, reducing diffraction sound across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an acoustic material is provided alone as the sound absorbing panel, then the structure is simple, but the acoustic material cannot be protected from external forces such as wind
Solution Approach 1:
The sound absorbing panel is segmented into multiple functional layers: a protective outer frame body, acoustic materials (first and second acoustic materials) for sound absorption, and air-permeable members for acoustic performance. This segmentation allows each component to fulfill its specific function while working together as an integrated system.
Solution Approach 2:
The panel uses composite construction combining rigid metal frame body, porous acoustic materials, and air-permeable membrane materials. This composite approach provides both mechanical protection and acoustic functionality, resolving the contradiction between structural protection and acoustic performance.
2Reliability
If an outer frame body formed of a metal plate is provided to protect the acoustic material, then the acoustic material is protected from external forces, but the effect of reducing high-frequency sound is lower than when providing the acoustic material alone
Solution Approach 1:
The panel implements local quality by making the air-permeable member cover only specific regions (peripheral surfaces) rather than the entire acoustic material. This allows sound waves to access the acoustic material through multiple pathways while the frame provides localized protection where structurally necessary.
Solution Approach 2:
The panel uses porous acoustic materials (first and second acoustic materials) that allow sound wave penetration. The air-permeable member also maintains porosity to enable acoustic wave transmission while providing protective coverage, ensuring high-frequency sound reduction is not compromised by the protective frame structure.
3Reliability
If the peripheral surface of the second acoustic material is completely covered by an air-permeable member, then the acoustic material is protected, but air-permeability is not ensured at corner portions, reducing edge effect suppression performance
Solution Approach 1:
The air-permeable member coverage is designed asymmetrically, completely covering peripheral surfaces while deliberately leaving corner portions uncovered or differently covered. This asymmetric design optimizes both protection and acoustic performance by maintaining coverage for structural protection while ensuring corner accessibility for sound wave propagation and edge effect suppression.
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 absorbs and reduces both low-frequency and high-frequency diffraction sound, improving soundproof performance by ensuring air permeability and structural support, thereby preventing sound from spreading to the residential area.
Implementation Method 1
a peripheral surface of the second acoustic material except for a corner portion of an upper end edge on a sound source side is covered by an air-permeable member
Implementation Method 2
an acoustic material exhibits a high acoustic effect for high-frequency sound if the acoustic material has no part shielded by a hard frame body or the like and air-permeability is ensured over the whole peripheral surface
Data Source
AI summary
A sound absorbing panel is provided above an uppermost of soundproof panels arranged in plural stages in a vertical direction and each having a back surface opposite to a sound source side, the back surface being formed to be a sound insulating surface, the sound absorbing panel including: an outer frame body having therein an acoustic space in which a first acoustic material is provided, the outer frame body allowing formation of a partition wall separating a sound source and a surrounding area from each other, the outer frame body having, at a front and back portions thereof, sound transmitting surfaces each having multiple sound through holes allowing transfer of sound between the acoustic space and outside thereof; and a second acoustic material provided above an upper end of the outer frame body such that a peripheral surface of the second acoustic material except for a corner portion is air-permeable.