Soundproof structure and soundproof system
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Solution Overview
Problem
Conventional soundproof materials face challenges in effectively absorbing low-frequency sounds, requiring large and heavy structures, and lack the ability to easily adjust soundproofing frequency characteristics, which is essential for equipment and industrial applications.
Innovation Solution
A soundproof structure comprising two cylindrical soundproof units with hollow inner spaces and closely arranged opening portions, less than 20 mm apart, that utilize air column resonance to shift the resonance frequency to the low-frequency side, allowing for compact and lightweight soundproofing and easy frequency adjustment through a moving mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sound absorbing materials are used for low-frequency soundproofing, then sound insulation performance is achieved, but the structure becomes large and heavy
Solution Approach 1:
The invention changes the physical parameters of the soundproofing approach by using air column resonance in cylindrical tubes instead of conventional mass-based absorption materials. By adjusting the length and diameter of the cylinders, the resonance frequency can be tuned to target low-frequency sounds, achieving effective sound insulation without requiring large masses of traditional soundproofing materials.
Solution Approach 2:
The invention replaces the mechanical mass-based sound absorption mechanism with an acoustic resonance mechanism. Instead of relying on the mass and density of soundproofing materials to absorb low-frequency sounds, the system uses the natural resonance frequency of air columns in cylindrical tubes to selectively attenuate specific low-frequency sound waves, thereby reducing the required structural mass.
2Reliability
If conventional sound absorbing materials are used for low-frequency soundproofing, then sound insulation performance is achieved, but the structure becomes large in size
Solution Approach 1:
The invention changes the physical parameters of the soundproofing approach by using air column resonance in cylindrical tubes instead of conventional mass-based absorption materials. By adjusting the length and diameter of the cylinders, the resonance frequency can be tuned to target low-frequency sounds, achieving effective sound insulation without requiring large masses of traditional soundproofing materials.
3Adaptability or versatility
If traditional soundproofing methods are used, then broad frequency coverage is achieved, but the ability to easily adjust soundproofing frequency characteristics is lost
Solution Approach 1:
The invention introduces dynamic adjustability to the soundproofing system by making the cylindrical resonators movable relative to each other. This allows the distance between adjacent cylinders to be varied, which in turn adjusts the coupling between resonators and shifts the resonance frequency. Such dynamic configuration enables the system to adapt to different frequency requirements without redesigning the entire structure.
Solution Approach 2:
The invention changes the physical parameters of the soundproofing approach by using air column resonance in cylindrical tubes instead of conventional mass-based absorption materials. By adjusting the length and diameter of the cylinders, the resonance frequency can be tuned to target low-frequency sounds, achieving effective sound insulation without requiring large masses of traditional soundproofing materials.
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 sound insulation on the low-frequency side with reduced size and weight, while allowing for precise adjustment of soundproofing frequency characteristics, addressing the limitations of traditional materials.
Implementation Method 1
have a hollow inner space inside the outer shell and have 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
Data Source
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.