Soundproof Structure Using Segmented Resonant Cells

Solution Overview

Problem

Conventional soundproof structures are heavy and large due to mass-based sound insulation, making them unsuitable for applications like equipment and automobiles, and struggle with effectively shielding low-frequency sounds, while existing solutions either limit frequency selection or are not suitable for specific installations.

Innovation Solution

A soundproof structure comprising multiple soundproof cells arranged in a two-dimensional manner, each with a frame and a film, featuring different resonance frequencies and physical properties such as film thickness, tension, and material, to achieve strong sound insulation independent of shape and size, allowing for selective frequency shielding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mass-based sound insulation is used, then sound insulation effectiveness is improved, but the structure becomes heavy and large

Engineering Contradiction:

Improvesound insulation effectivenessVSAvoidstructure weight

Core Design Contradiction:

ReliabilityVSWeight of stationary object

Solution Approach 1:

The soundproof structure is divided into multiple independent soundproof cells arranged in a two-dimensional array. Each cell contains a frame with a film stretched across it, creating discrete resonating units. This segmentation allows the structure to achieve effective sound insulation through coordinated resonance of multiple lightweight cells rather than requiring a single heavy mass barrier.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the fundamental parameter from mass to resonance frequency control. By adjusting film thickness, tension, and cell dimensions, each soundproof cell is tuned to resonate at specific frequencies. This parameter transformation enables lightweight structures to block sounds effectively through resonant cancellation rather than mass-based blocking.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If mass-based sound insulation is used, then sound insulation effectiveness is improved, but the structure becomes large

Engineering Contradiction:

Improvesound insulation effectivenessVSAvoidstructure area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The soundproof structure is divided into multiple independent soundproof cells arranged in a two-dimensional array. Each cell contains a frame with a film stretched across it, creating discrete resonating units. This segmentation allows the structure to achieve effective sound insulation through coordinated resonance of multiple lightweight cells rather than requiring a single heavy mass barrier.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the fundamental parameter from mass to resonance frequency control. By adjusting film thickness, tension, and cell dimensions, each soundproof cell is tuned to resonate at specific frequencies. This parameter transformation enables lightweight structures to block sounds effectively through resonant cancellation rather than mass-based blocking.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional soundproof structures are used, then general frequency shielding is achieved, but low frequency sound shielding is difficult

Engineering Contradiction:

Improvefrequency shielding capabilityVSAvoidlow frequency shielding capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Different soundproof cells are tuned to different resonance frequencies by varying film thickness, tension, and cell dimensions. This local differentiation allows specific frequency ranges to be targeted. Cells with lower resonance frequencies are specifically designed to handle low-frequency sounds, while other cells address higher frequencies, creating a comprehensive frequency coverage system.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes the fundamental parameter from mass to resonance frequency control. By adjusting film thickness, tension, and cell dimensions, each soundproof cell is tuned to resonate at specific frequencies. This parameter transformation enables lightweight structures to block sounds effectively through resonant cancellation rather than mass-based blocking.

Inventive Principle:

Principle #35Parameter changes

4Adaptability or versatility

If frequency-selective soundproof cells are used, then arbitrary frequency shielding is achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvefrequency selection capabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The soundproof structure is divided into multiple independent soundproof cells arranged in a two-dimensional array. Each cell contains a frame with a film stretched across it, creating discrete resonating units. This segmentation allows the structure to achieve effective sound insulation through coordinated resonance of multiple lightweight cells rather than requiring a single heavy mass barrier.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Despite having different resonance frequencies, all soundproof cells share the same basic structure of frame and film. This universal design allows standardized manufacturing processes to be used across all cells, with only minor adjustments to film properties or dimensions needed to achieve different frequency tunings. The modular approach simplifies production while maintaining frequency selectivity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 provides robust, lightweight sound insulation capable of shielding arbitrary frequency components, suitable for various applications including equipment and automobiles, with improved manufacturing suitability and cost-effectiveness.

Implementation Method 1

two or more types of soundproof cells having different first resonance frequencies are present in the plurality of soundproof cells

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

a film vibration is fixed at the frame portion

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 3

the principle of sound insulation is a stiffness law different from the mass law described above. Accordingly, low frequency components can be further shielded even with a thin structure

Methodology Applied

Scientific EffectStiffness law:

Data Source

PatentUS10704255B2Soundproof structure and soundproof structure manufacturing method

Publication Date: 2020.07.07 FUJIFILM CORP

AI summary

A soundproof structure has a plurality of soundproof cells arranged in a two-dimensional manner. Each of the plurality of soundproof cells includes a frame formed of a frame member forming an opening and a film fixed to the frame. Two or more types of soundproof cells having different first resonance frequencies are present in the plurality of soundproof cells. A shielding peak frequency at which transmission loss is maximized is present within a range equal to or higher than a lowest frequency among first resonance frequencies of the soundproof cells and equal to or lower than a highest frequency among the first resonance frequencies of the soundproof cells.