Earpiece Acoustic Attenuation Using Magnetorheological Fluid

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Sudden acoustical shocks, such as gun blasts or explosions, can cause hearing damage and disorientation, and existing systems are unable to effectively monitor and electrically vary sound levels in real time to provide adequate protection.

Innovation Solution

A device using FerroFluids (FF) and Magnetorheological Fluids (MRF) in earpieces that can alter acoustic energy transmission by responding to magnetic or electric fields, allowing for real-time attenuation or generation of acoustical signals based on detected sound levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional passive attenuation devices are used, then device complexity is reduced, but the ability to dynamically adjust attenuation levels in real-time is lost

Engineering Contradiction:

Improvedynamic attenuation adjustmentVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by using magnetorheological fluid whose attenuation properties can be dynamically changed in real-time through application of magnetic fields. The system transitions from static passive attenuation to dynamic active control, allowing the attenuation level to be adjusted continuously based on environmental conditions while maintaining relatively simple device architecture.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the physical parameter of the attenuation medium by using magnetorheological fluid that alters its viscosity and flow characteristics in response to magnetic field strength. By varying the magnetic field parameter, the system achieves continuous adjustment of attenuation levels without mechanical moving parts, resolving the contradiction between adaptability and complexity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If real-time acoustic monitoring and attenuation adjustment is implemented, then protection against sudden loud noises is improved, but response time of conventional systems is too slow

Engineering Contradiction:

Improveprotection reliabilityVSAvoidresponse time

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent replaces mechanical adjustment mechanisms with magnetic field control of magnetorheological fluid. This substitution enables electronic control of attenuation levels with millisecond response times, far exceeding the capability of mechanical systems. The magnetic field can be adjusted instantaneously based on acoustic sensor input, achieving both high reliability and fast response time.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements a feedback control system where acoustic sensors continuously monitor the environment, and the detected sound levels are used to adjust the magnetic field strength applied to the magnetorheological fluid. This closed-loop feedback enables the system to respond automatically and rapidly to sudden loud noises, improving both protection reliability and response speed.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If magnetorheological fluid is used for acoustic control, then attenuation control precision is improved, but energy consumption increases

Engineering Contradiction:

Improveattenuation control precisionVSAvoidenergy consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies partial action by using the magnetorheological fluid only when and where needed for acoustic attenuation, rather than continuously. The magnetic field is activated only when acoustic sensors detect potentially harmful sound levels, reducing overall energy consumption while maintaining precise attenuation control when required. This selective application resolves the contradiction between precision and energy use.

Inventive Principle:

Principle #16Partial or excessive action

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 device provides real-time protection by dynamically adjusting sound levels, offering faster response times and enhanced protection against sudden loud noises compared to conventional systems, effectively reducing hearing damage and disorientation.

Implementation Method 1

A device using FerroFluids (FF) and Magnetorheological Fluids (MRF) in earpieces that can alter acoustic energy transmission by responding to magnetic or electric fields

Methodology Applied

Scientific EffectMagnetorheological Effect: Magnetorheological Fluid

Implementation Method 2

A device using FerroFluids (FF) and Magnetorheological Fluids (MRF) in earpieces that can alter acoustic energy transmission by responding to magnetic or electric fields

Methodology Applied

Scientific EffectElectrorheological Effect: Electrorheological Effect

Data Source

PatentUS9123323B2Method and structure for inducing acoustic signals and attenuating acoustic signals

Publication Date: 2015.09.01 ST PORTFOLIO HLDG LLC

AI summary

At least embodiment is directed to an earpiece comprising a housing; and a field responsive fluid, where the field responsive fluid is in the housing, where the housing is part of the earpiece, and where the earpiece is configured to vary a field to vary an acoustical property of the field responsive fluid.