Microperforated Sound Absorbing Cell with Reflective Plate
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Solution Overview
Problem
Conventional sound absorbing boards are limited in their ability to absorb sound across a wide frequency band, require large and complex structures, are weak to humidity, and pose environmental concerns due to potential toxic gas emission during fires.
Innovation Solution
A sound absorbing cell structure comprising stacked plates with interposed air layers, including a reflective plate and a microperforated plate with a perforation ratio of 1% or less, and optionally an elastic plate, allowing for adjustable sound absorption across various frequency bands and improved durability and environmental safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sound absorbing board made of porous fiber material is used, then it can absorb sound, but it is weak to humidity and has poor durability
Solution Approach 1:
The patent uses a composite structure combining a rigid plate (metal or resin) with a porous substrate. The rigid plate provides durability and humidity resistance, while the porous substrate maintains sound absorption functionality. This composite approach resolves the contradiction by integrating materials with complementary properties.
Solution Approach 2:
The patent employs a porous substrate material that allows sound waves to penetrate and be absorbed. The porous structure is combined with a rigid plate to maintain both sound absorption capability and resistance to humidity, solving the contradiction between acoustic performance and environmental durability.
2Reliability
If a conventional sound absorbing board made of porous material is used, then it can absorb sound, but it may generate toxic gas in case of fire
Solution Approach 1:
The patent combines a rigid plate (metal or resin) with a porous substrate to create a composite structure. The rigid plate component provides fire resistance and prevents toxic gas generation, while the porous substrate maintains sound absorption performance, thus resolving the contradiction between acoustic functionality and fire safety.
3Adaptability or versatility
If a Helmholtz resonator is used, then it provides sound absorbing effect for specific frequency, but it requires large and complex resonator structure
Solution Approach 1:
The patent uses a porous substrate material that can absorb sound across a wide frequency band without requiring complex resonator structures. The porous structure naturally provides broadband sound absorption, eliminating the need for large and complex Helmholtz resonator designs while maintaining effective sound absorption.
Solution Approach 2:
The patent adjusts parameters such as the thickness of the rigid plate, the porosity of the substrate, and the spacing between layers to optimize sound absorption across different frequency bands. These parameter adjustments enable broadband absorption without increasing structural complexity.
4Adaptability or versatility
If a sound absorbing board made of porous material is used, then it can absorb sound in low frequency band, but it needs to be thick
Solution Approach 1:
The patent combines a rigid plate with a porous substrate to create a composite structure that achieves effective low frequency sound absorption with reduced thickness. The rigid plate provides structural integrity and enhances low frequency absorption, while the porous substrate contributes to overall sound absorption performance, eliminating the need for excessive thickness.
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 structure effectively absorbs sound across a wide frequency band, is durable and resistant to humidity, and is environmentally friendly, with the ability to be optimally designed for specific frequency bands and reduced risk of toxic gas emission.
Implementation Method 1
a microperforated plate that is stacked on the reflective plate and having a plurality of holes perforated therein
Implementation Method 2
a reflective plate that is disposed outermost from a space where sound is generated
Implementation Method 3
an elastic plate that is stacked on the reflective plate or the microperforated plate
Data Source
AI summary
A sound absorbing cell according to an exemplary embodiment of the present invention is formed of a plurality of plates that are stacked while interposing an air layer therebetween, wherein the plurality of plates include: a reflective plate that is disposed outermost from a space where sound is generated; and a microperforated plate that is stacked on the reflective plate and having a plurality of holes perforated therein.