Acoustic Filter Membrane for Selective High-Intensity Wave Attenuation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing hearing protection devices fail to effectively attenuate high-intensity acoustic waves while allowing low-intensity sounds to pass through, leading to compliance issues due to reduced situational awareness and potential ear damage from unpredictable loud noises.

Innovation Solution

An acoustic filter comprising a first and second substrate with holes and a membrane within a chamber, where the membrane is unconstrained and moves freely to attenuate high-intensity acoustic waves without constraining the membrane, allowing low-intensity sounds to pass through.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional hearing protection devices are used to attenuate high-intensity acoustic waves, then hearing protection is provided, but low-intensity sounds are also blocked reducing situational awareness

Engineering Contradiction:

Improvehearing protection from high-intensity acoustic wavesVSAvoidsituational awareness from low-intensity sounds

Core Design Contradiction:

Object-affected harmful factorsVSLoss of information

Solution Approach 1:

The membrane transitions from a constrained state (when attached to substrates) to an unconstrained state (when detached), allowing it to move freely in response to acoustic pressure variations. This dynamic behavior enables the device to adaptively respond to different sound intensities without external control mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the physical state of the membrane from constrained to unconstrained, fundamentally altering its ability to respond to acoustic waves. This parameter change enables the membrane to vibrate freely for low-intensity sounds while still providing protection for high-intensity sounds.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the membrane is constrained between substrates to provide stable positioning, then structural stability is improved, but the membrane cannot move freely to respond to acoustic waves

Engineering Contradiction:

Improvemembrane positioning stabilityVSAvoidmembrane responsiveness to acoustic waves

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The membrane's constraint status is changed from static (constrained) to dynamic (unconstrained), enabling it to move freely in response to acoustic pressure while maintaining stable positioning when needed. This dynamic configuration allows the membrane to serve both stabilization and responsiveness functions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The membrane is extracted from its constrained position between the substrates and placed into an unconstrained state within the chamber. This extraction removes the limiting constraint, allowing the membrane to move freely and respond to acoustic waves without interference from the substrates.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If the membrane dimension is made smaller than the chamber to allow free movement, then acoustic wave responsiveness is improved, but membrane positioning control becomes more difficult

Engineering Contradiction:

Improveacoustic wave responsivenessVSAvoidmembrane positioning control

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The membrane is extracted from direct contact with the substrates and positioned freely within the chamber. This extraction eliminates the need for precise positioning control mechanisms, as the membrane's free movement is sufficient for its acoustic responsiveness function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The chamber serves multiple functions: it provides a defined space for the membrane to move freely, maintains the acoustic seal, and eliminates the need for additional positioning control mechanisms. This multi-functionality simplifies the overall device operation.

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 filter provides effective attenuation of high-intensity acoustic waves while maintaining low-intensity sound transmission, enhancing situational awareness and safety without the need for power sources or manual adjustments.

Implementation Method 1

The membrane can be unconstrained or can be not taut between opposing ends of the membrane prior to an acoustic wave being applied to the acoustic filter

Methodology Applied

Scientific EffectAcoustic radiation pressure: Acoustic Radiation Pressure

Data Source

PatentUS20260080854A1Systems and methods for attenuating acoustic waves

Publication Date: 2026.03.19 THE GENERAL HOSPITAL CORP

AI summary

An acoustic filter can include a first substrate including a first plurality of holes directed, therethrough, a second substrate including a second plurality of holes directed therethrough, a chamber defined between the first substrate and the second substrate, and a membrane positioned within the chamber. The membrane can have a dimension other than the thickness of the membrane that can be less than a corresponding dimension of the chamber. The acoustic filter can be configured to attenuate a first acoustic wave that passes through the acoustic filter, the first acoustic wave can have a first amplitude above an amplitude threshold. The acoustic filter can be configured to passthrough a second acoustic wave without substantially attenuating the second acoustic wave, the second acoustic wave can have a second amplitude below’ the amplitude threshold.