Soundproofing structure and soundproofing system
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Solution Overview
Problem
Conventional soundproof materials face challenges in effectively absorbing low-frequency sounds, requiring large size and weight, and struggle with adjusting soundproofing frequency characteristics easily.
Innovation Solution
A soundproof structure comprising two cylindrical soundproof units with a hollow inner space and opening portions that are arranged close to each other, utilizing air column resonance to shift the resonance frequency to the low-frequency side, allowing for compact size and easy frequency adjustment through the distance between the opening portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sound absorbing materials are used for low-frequency soundproofing, then sound insulation performance is improved, but the size and weight of the structure increase significantly
Solution Approach 1:
The invention changes the fundamental parameter of soundproofing mechanism from material absorption to air column resonance. By adjusting the length of the cylindrical cavity and the distance between openings, the resonance frequency can be tuned to target low-frequency sounds, achieving effective sound insulation without requiring heavy absorbing materials
Solution Approach 2:
The invention replaces the mechanical sound absorption mechanism (using dense fibrous materials) with an acoustic resonance mechanism (air column oscillation in a cylindrical cavity). This substitution allows low-frequency soundproofing to be achieved with a much lighter and more compact structure
2Reliability
If conventional sound absorbing materials are used for low-frequency soundproofing, then sound insulation performance is improved, but the volume of the structure increases
Solution Approach 1:
The invention changes the fundamental parameter of soundproofing mechanism from material absorption to air column resonance. By adjusting the length of the cylindrical cavity and the distance between openings, the resonance frequency can be tuned to target low-frequency sounds, achieving effective sound insulation without requiring heavy absorbing materials
Solution Approach 2:
The soundproof unit can be nested within or integrated into existing structures such as ducts or walls. The cylindrical cavity is positioned within the outer shell, and multiple units can be arranged in series or parallel configurations, allowing compact integration into space-constrained environments
3Adaptability or versatility
If the rear volume or film hardness is changed to adjust soundproofing frequency, then the target frequency can be shifted, but the structure becomes more complex and harder to adjust
Solution Approach 1:
The invention uses simple geometric parameters (cavity length and opening distance) to control resonance frequency. These parameters can be easily adjusted during manufacturing or even modified in-service by changing the position of the openings, providing frequency adaptability without complex mechanisms
Solution Approach 2:
The invention allows the soundproofing system to be dynamically adjusted by changing the distance between the openings or the length of the cylindrical cavity. This can be achieved through movable components or adjustable structures, enabling the system to adapt to different frequency requirements
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 configuration enables effective low-frequency sound insulation with reduced size and weight, allowing for easy adjustment of soundproofing frequency characteristics, addressing the limitations of traditional materials.
Implementation Method 1
a resonance wave having an opposite phase to noise, which is incident from a noise source and passes through the ventilation groove (slit), so as to cancel each other is generated by using slit resonance (slit Helmholtz resonance) and the volume of the inside
Implementation Method 2
a resonance wave having an opposite phase to noise, which is incident from a noise source and passes through the ventilation groove (slit), so as to cancel each other is generated by using slit resonance (slit Helmholtz resonance)
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A soundproof structure has two or more soundproof units. Each of the soundproof units has an outer shell having a cylindrical shape, has a hollow inner space inside the outer shell, and has a first opening portion opened to outside on a surface that is one end portion of the outer shell in an axis direction of the cylindrical shape. The two soundproof units adjacent to each other are disposed in the axis direction such that the first opening portions face each other. The first opening portions facing each other are spaced apart from each other in the axis direction. An average distance in the axis direction between the first opening portions facing each other is less than 20 mm. Accordingly, there are provided a soundproof structure and a soundproof system which can insulate sounds on the low frequency side with a simple configuration, are small and lightweight, and can easily change the frequency characteristics.