Box-Shaped Soundproof Structure With Resonator For Noise Reduction
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Solution Overview
Problem
Conventional porous sound absorbing bodies fail to adequately reduce noise at specific frequencies generated by electronic devices like electric motors, leading to increased audibility of natural frequencies, and are often bulky, making them unsuitable for compact electronic apparatuses.
Innovation Solution
A box-shaped soundproof structure with a resonator, including a frame and a membrane-like member that performs membrane vibration, is used to selectively reduce noise at specific frequencies by utilizing resonance phenomena, allowing for a compact and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large amount of porous sound absorbing body is disposed to sufficiently reduce noise at natural frequencies, then noise reduction effect is improved, but the size and weight of the electronic apparatus increase
Solution Approach 1:
The patent extracts the function of targeted frequency noise reduction from the bulk porous material by introducing resonators with specific resonance frequencies. These resonators are tuned to match the natural frequencies of sound sources (electric motors, fans, inverters), allowing them to selectively target and reduce specific frequency noises without requiring large volumes of porous material
Solution Approach 2:
The patent changes the parameters of the sound reduction system by introducing resonators with specific resonance frequencies rather than relying solely on the broadband absorption characteristics of porous materials. By adjusting the resonance frequencies of the resonators to match the natural frequencies of the sound sources, the system achieves efficient targeted noise reduction with reduced material quantity
2Object-affected harmful factors
If a large amount of porous sound absorbing body is disposed to sufficiently reduce noise at natural frequencies, then noise reduction effect is improved, but heat insulation increases causing heat storage in the apparatus
Solution Approach 1:
The patent extracts the targeted frequency noise reduction function from the bulk porous material by introducing resonators. This reduces the total volume of porous sound absorbing material required, thereby reducing the heat insulation effect and improving heat dissipation while maintaining effective noise reduction at natural frequencies
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 solution effectively reduces noise at natural frequencies while maintaining sound reduction across a wide frequency range, achieving a high sound reduction effect with a smaller and lighter structure compared to traditional methods.
Implementation Method 1
a resonator disposed in the box... utilizing resonance phenomena
Implementation Method 2
a membrane-like member that performs membrane vibration
Data Source
AI summary
Provided is a box-shaped soundproof structure that is small and light and can sufficiently reduce noise with a natural frequency of a sound source. A box at least a part of which is opened; and a sound reduction structure including a resonator disposed in the box are included, and a sound generated from a sound source disposed in contact with an outer surface of a wall of the box or in the box and emitted from an open surface of the box to the outside is reduced by the sound reduction structure.