US11200875B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11200875-B2 |
| Application number | US-201916240087-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 4, 2019 |
| Priority date | Dec 7, 2018 |
| Publication date | Dec 14, 2021 |
| Grant date | Dec 14, 2021 |
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A method of shielding acoustic wave, which is capable of completely shielding sound while reducing consumption of a shielding material is provided. The method of shielding acoustic wave, includes covering an object to be shielded with a first shielding material so that a lower portion of the object to be shielded is opened, covering an upper portion of the first shielding material by using a second shielding material which is an acoustic wave meta material having same absolute value but negative sign in density and bulk modulus comparing to the first shielding material, and covering the second shielding material with a third shielding material.
Opening claim text (preview).
What is claimed is: 1. A method of shielding acoustic wave, comprising: covering an object to be shielded with a first shielding material so that a lower portion of the object to be shielded is opened; covering an upper portion of the first shielding material by using a second shielding material which is an acoustic wave meta material having same absolute value but negative sign in density and bulk modulus comparing to the first shielding material; and covering the second shielding material with a third shielding material. 2. The method of claim 1 , wherein the object to be shielded is covered with the third shielding material disposed between σ 2 <σ 1 of bipolar cylindrical coordinates determined by coordinate axes of (σ, τ, z). 3. The method of claim 2 , wherein a density according to the position of the third shielding material satisfies the relational equation ρ σ =(σ 2 −π)/(σ 2 −σ 1 ).
Materials, e.g. special compositions or gases · CPC title
Selection of materials · CPC title
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