Open Bottom Cavity Sound Absorber Frame Design

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Solution Overview

Problem

Existing sound absorbers, such as cylindrical designs, fail to achieve sufficient sound reduction due to limited contact surface between sound-absorbing materials and sound-transmitting gases, leading to inadequate sound damping.

Innovation Solution

The sound absorber features an open bottom cavity with a frame running along the sound absorber element, increasing the contact surface between the sound-absorbing material and sound-transmitting gas, and uses a structurally simple design with mats forming cycloid or hypocycloid cross-sections, along with a frame made of metal or plastic components, to enhance sound absorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the bottom opening of the cavity is closed or covered by a frame, then the structural stability is improved, but the contact area between sound-absorbing material and sound-transmitting gas is reduced

Engineering Contradiction:

Improvestructural stabilityVSAvoidcontact area between sound-absorbing material and sound-transmitting gas

Core Design Contradiction:

Stability of the object's compositionVSArea of stationary object

Solution Approach 1:

The patent uses a thin frame structure that provides minimal coverage over the cavity opening. The frame acts as a flexible support that maintains structural integrity while allowing maximum sound wave penetration and contact between the sound-absorbing material and the gas, resolving the contradiction between stability and surface area.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The frame provides partial coverage of the cavity opening rather than complete closure. This partial action is sufficient to maintain structural stability while leaving the majority of the opening exposed to maximize the contact area between sound-absorbing material and sound-transmitting gas.

Inventive Principle:

Principle #16Partial or excessive action

2Strength

If the frame covers large portions of the inner and outer surfaces, then structural support is improved, but the sound absorption capacity is reduced

Engineering Contradiction:

Improvestructural supportVSAvoidsound absorption capacity

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The frame is designed as a thin structural element that provides necessary support while minimizing interference with sound absorption. The thin profile ensures that the frame does not significantly block sound waves from reaching the sound-absorbing material on the inner and outer surfaces.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The frame is positioned and dimensioned to provide structural support only where absolutely necessary, leaving the majority of the inner and outer surfaces exposed for optimal sound absorption. This localized approach to structural support maximizes the sound-absorbing surface area.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If complex shapes are used to increase surface area, then sound absorption is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvesound absorptionVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent employs cycloidal and hypocycloidal cross-sectional shapes for the sound-absorbing element. These curved geometries increase the internal surface area available for sound absorption while maintaining manufacturing feasibility through standardized molding processes, balancing acoustic performance with ease of production.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 design significantly increases sound absorption capacity, creating a stable and cost-effective sound absorber with improved sound damping by maximizing the contact surface and reducing reflections, while maintaining a compact and easy-to-produce structure.

Implementation Method 1

the contact area between the sound-absorbing material and the sound-transmitting gas can be significantly increased

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Implementation Method 2

allowing sound to penetrate the cavity of the sound absorber element unhindered and thus without reflection, thereby damping it

Methodology Applied

Scientific EffectAcoustic damping: Damping

Data Source

PatentEP3103114B1Sound absorber

Publication Date: 2021.06.02 DOROLTI VASILE LIC

Figure 1
Figure 2~3
Figure 4~5

AI summary

The invention relates to a sound absorber (1, 100, 101) that is to be suspended freely in a room (3) and comprises a sound absorber element (4) forming a cavity (24), and a mount (5) which retains the sound absorber element (4) and which includes at least one anchoring point (12) for suspending the sound absorber (1) and at least two opposite support surfaces (8, 9), against each of which an end face (10, 11) of the sound absorber element (4) rests. In order to obtain a high degree of sound absorption, the bottom opening (13) in the cavity (24) of the sound absorber element (4) is open towards the outside of the sound absorber (1), wherefor the frame-type mount (5) extends longitudinally along the sound absorber element (4) and ends in a support surface (9) for the lower end face (11) of the sound absorber element (4).