Bubble-Liquid Sound Barrier for Broadband Noise Attenuation
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Solution Overview
Problem
Existing noise reduction equipment is large, expensive, and inefficient, primarily operating over narrow frequency bands, failing to effectively mitigate noise pollution from heavy machinery.
Innovation Solution
An apparatus that surrounds a sound emitter with a container filled with liquid containing at least 2% dissolved oxygen, agitated to form gas bubbles, which attenuate sound across a wide frequency band by scattering and absorbing sound waves at liquid-gas interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional noise reduction equipment is used, then sound transmission is limited, but the equipment becomes large, expensive, and energy-consuming
Solution Approach 1:
The patent changes the physical state of the liquid from normal to supersaturated with dissolved oxygen (at least 2% by volume), and uses agitation to transform it into a bubbly mixture. This parameter change in the medium's composition and structure enables effective sound attenuation without requiring large traditional noise reduction equipment
Solution Approach 2:
The patent replaces complex mechanical noise reduction systems with a chemically-prepared liquid medium that naturally attenuates sound through its bubbly structure. The agitation mechanism simply mixes the liquid to create bubbles, substituting complex acoustic engineering with a simpler chemical-physical solution
2Object-affected harmful factors
If traditional noise reduction equipment is used, then sound transmission is limited, but the equipment operates only over narrow frequency bands
Solution Approach 1:
The patent creates a liquid medium with controlled bubble size distribution through agitation of supersaturated oxygenated liquid. The bubbles range from microscopic to visible sizes, creating a broadband attenuation effect that covers both low and high frequencies, unlike traditional equipment limited to narrow frequency bands
Solution Approach 2:
The patent creates a composite liquid-gas medium where oxygen bubbles are distributed throughout the liquid. This composite structure with varying bubble sizes provides broadband sound attenuation across multiple frequency ranges, enhancing adaptability to different sound sources
3Quantity of substance
If compressors are used to force gas bubbles through liquid, then bubbles are formed, but the apparatus becomes more expensive and energy-consuming
Solution Approach 1:
The patent uses the liquid itself (supersaturated with dissolved oxygen) to generate the bubbles through agitation. The dissolved oxygen naturally comes out of solution when agitated, forming bubbles without requiring external compressors or additional energy input to force gas through the liquid
Solution Approach 2:
The patent changes the dissolved oxygen concentration parameter to supersaturation levels (at least 2% by volume), which enables spontaneous bubble formation upon agitation. This parameter change eliminates the need for energy-consuming compression devices while still producing sufficient bubbles for noise reduction
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 apparatus efficiently limits sound transmission by forming a broad spectrum of gas bubbles, reducing sound energy through repeated interfaces and altering sound speed, achieving effective noise reduction without compressors, and operating over a wide frequency range.
Implementation Method 1
At least a portion of the bubbles may be formed by nucleation
Implementation Method 2
At least a portion of the bubbles may be formed by cavitation
Implementation Method 3
Some scattering and absorption can take place at each such interface
Implementation Method 4
sound energy is absorbed and the sound is attenuated
Implementation Method 5
There may also be some resonant absorption where the sound waves are of an appropriate frequency to cause resonance of some of the bubbles
Data Source
AI summary
In summary, there is provided apparatus (1) for limiting transmission of sound from a sound emitter (2), the apparatus comprising a container (4) arranged to at least partially surround a sound emitter, the container retaining a liquid, wherein the liquid comprises at least 2% dissolved oxygen, and wherein the apparatus further comprises an agitator (6) configured to agitate the liquid, to thereby cause the formation of gas bubbles (8) in the liquid.