Sound Absorption Apparatus Diaphragm Damping
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Solution Overview
Problem
Helmholtz resonators with a two-degree-of-freedom system face challenges in suppressing the valley characteristic in sound absorption coefficients, requiring trial and error in attaching damping materials to the elastic plate for optimal performance.
Innovation Solution
A sound absorption apparatus is designed with a combination of a diaphragm and a supporting member, which replaces the elastic plate, allowing for adjustable natural frequency and damping effects without the need for additional damping materials, by varying the thickness and shape of the diaphragm and supporting member components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damping material is attached to the elastic plate to suppress the valley characteristic, then sound absorption performance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts the damping function from a separate attached material and integrates it into the elastic plate itself through through-hole structures. The damping effect is achieved by the air resistance and friction within the through-holes rather than by adding external damping material, thus eliminating the need for additional components while maintaining sound absorption performance.
Solution Approach 2:
The elastic plate is designed with through-hole structures that create a porous configuration. These through-holes provide damping effect through air resistance and friction as sound waves pass through them, eliminating the need for separate damping materials while achieving the desired sound absorption characteristics and suppressing valley features.
2Reliability
If trial and error is used to attach damping material to the elastic plate, then optimal sound absorption characteristics are achieved, but time consumption and productivity decrease
Solution Approach 1:
The elastic plate structure is designed to be self-adjusting through its through-hole configuration. By varying parameters such as the number, size, and distribution of through-holes, the structure automatically provides the necessary damping effect without requiring external adjustment or trial-and-error attachment of separate damping materials, thereby improving productivity while maintaining optimal sound absorption characteristics.
3Reliability
If additional damping materials are used to suppress valley characteristic, then sound absorption coefficient is improved, but manufacturing cost and material usage increase
Solution Approach 1:
The invention merges the damping function with the elastic plate structure itself by incorporating through-hole structures directly into the plate. This integration eliminates the need for separate damping materials, reducing material usage and manufacturing cost while maintaining the sound absorption coefficient through the combined acoustic and damping functions of the unified structure.
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 design facilitates easy adjustment of sound absorption characteristics, effectively suppressing the valley characteristic and achieving high sound absorption performance across a wide frequency band without the need for additional damping materials.
Implementation Method 1
The Helmholtz resonator can generate resonance in the internal space by sound that has entered in the internal space through the sound hole, thereby attenuating vibration energy of the sound at a resonance frequency
Implementation Method 2
a sound absorption apparatus that reduces sound such as noise
Data Source
AI summary
According to one embodiment, a sound absorption apparatus includes a front plate, a back plate, a diaphragm, a supporting member, a second frame, and a third frame. The front plate has a sound hole. The back plate faces the front plate. The diaphragm is provided between the front plate and the back plate. The supporting member supports the diaphragm. The supporting member includes a first frame attached to the diaphragm, a first member located inside the first frame and attached to the diaphragm, and a connecting member connecting the first frame and the first member. The second frame forms a first space between the front plate and the diaphragm. The third frame forms a second space between the back plate and the diaphragm.