Micro-perforated Acoustic Assembly for Broad Frequency Absorption
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Solution Overview
Problem
Existing sound-absorbing assemblies for enclosures have limitations in terms of size, weight, and efficiency, particularly in absorbing sound vibrations across a wide frequency spectrum, with prior solutions being ineffective for frequencies between 4000 and 8000 Hz.
Innovation Solution
An acoustic assembly comprising at least two superimposed supports with micro-perforations, where one support lacks micro-perforations and is visible, allowing for enhanced aesthetic appeal, and multiple series of micro-perforations with varying diameters and densities to optimize sound absorption across a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porous materials are used for sound absorption, then sound absorption capability is improved, but size and weight increase
Solution Approach 1:
The patent uses micro-perforated supports with孔径 (perforation diameters) of 0.5-2mm arranged in series, creating an equivalent porous structure without requiring traditional thick porous materials. The series arrangement of multiple supports with different perforation sizes creates a cumulative sound absorption effect across different frequency ranges, achieving high sound absorption capability with reduced weight and thickness compared to conventional porous absorbers.
2Reliability
If micro-perforations with diameter less than 2mm are used, then absorption is improved for frequencies between 300-4000 Hz, but absorption effectiveness decreases for frequencies between 4000-8000 Hz
Solution Approach 1:
The patent divides the sound absorption function across multiple supports, each with different micro-perforation diameters (0.5-2mm). Each support segment handles specific frequency ranges, and the series arrangement ensures that high frequencies (4000-8000 Hz) are absorbed by the cumulative effect of multiple segments, overcoming the limitation of single-diameter micro-perforations.
Solution Approach 2:
The patent varies the perforation diameter parameter across different supports (from 0.5mm to 2mm) to optimize absorption across different frequency ranges. This parameter variation allows the assembly to maintain high absorption efficiency across the entire 300-8000 Hz spectrum, with smaller perforations handling lower frequencies and larger perforations contributing to higher frequency absorption.
3Adaptability or versatility
If multiple supports with micro-perforations are superimposed, then sound absorption across broader frequency range is improved, but device complexity increases
Solution Approach 1:
Each support in the series serves multiple functions: it acts as a structural element, a sound absorption element for its specific frequency range, and a spacer maintaining the series arrangement. This multi-functionality reduces the need for additional components and simplifies the overall assembly process despite the presence of multiple supports.
Solution Approach 2:
The supports are arranged in a compact series configuration where each support is positioned close to the others, creating a nested-like structure. This compact arrangement minimizes the overall thickness of the assembly while maintaining the series configuration necessary for broad frequency coverage, thereby reducing spatial complexity.
4Shape
If a support without micro-perforations is added for aesthetic purposes, then appearance is improved, but device complexity increases
Solution Approach 1:
The non-perforated support serves dual functions: it provides the desired aesthetic appearance as a visible facade, and it acts as a structural support element maintaining the series arrangement of the micro-perforated supports behind it. This eliminates the need for separate aesthetic cladding, reducing overall assembly complexity.
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 proposed assembly achieves improved sound absorption efficiency across a wider frequency range, including frequencies above 2000 Hz, matching or exceeding the performance of prior systems while allowing for aesthetic benefits and flexibility in material choice.
Implementation Method 1
porous materials having the property of transforming into heat the sound vibrations which they receive due to the phenomena friction to which these materials were subjected due to these vibrations
Implementation Method 2
the control of the absorption of sounds by walls has called upon various devices comprising passive absorption elements
Data Source
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AI summary
The assembly (1) has two supports (3) formed with micro-perforations, and a support (2) formed without micro-perforations. The support without micro-perforations is not enclosed by the supports with micro-perforations. The supports with micro-perforations are superimposed with each other. The supports are formed of tensed layers constituted of films made of PVC. The supports consist of textile materials or any other flexible or rigid materials, where distance between the supports with micro-perforations is comprised between 10 and 90 mm.