Low-frequency sound absorption covering layer containing cylindrical scatterers with parameters changing in gradient mode
A technology of sound-absorbing covering layer and gradient change, which is applied in the direction of sound-emitting devices, layered products, and metal-layered products. simple effect
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[0028] Example 1
[0029] Absorbing coating of the present invention, the sound absorbing material layer and the sealing layer as a PDMS silicone rubber, the silicone rubber PDMS density 1000kg / m 3 , A Young's modulus of the complex (1.879 + 0.540i) MPa, Poisson's ratio was 0.4997. Density of the base layer was 7890kg / m 3 , A Young's modulus of 210 GPa, Poisson's ratio was 0.3. Distribution of sound absorbing cover layer three cylindrical cavity.
[0030] The present invention comprises a low-frequency anechoic coating parameters were graded cylindrical body containing scattering parameter changes stepwise cylindrical cavity anechoic coating, and comprising a low-frequency anechoic coating parameters were negative gradient cylindrical scatterer comparing. For the present invention contains as a parameter anechoic coating cylindrical gradient of scatterer: each unit, first, second and third layers contain a cylindrical scatterers. Chosen radius of the cylindrical body, the firs...
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[0032] Example 2
[0033] Anechoic coating material in the present example the sound absorbing layer and the sealing layer as a PDMS silicone rubber, the silicone rubber PDMS density 1000kg / m 3 , A Young's modulus of the complex (1.879 + 0.540i) MPa, Poisson's ratio was 0.4997. Density of the base layer was 7890kg / m 3 , A Young's modulus of 210 GPa, Poisson's ratio was 0.3. Three cylindrical scatterer distribution anechoic coating.
[0034] Using two parameters as a cylindrical scatterer anechoic coating cylindrical gradient scatterer with the present invention contains a different distribution of the sound absorbing layer coated cover layer thickness, compared with the present invention. For the present invention contains as a parameter anechoic coating cylindrical gradient of scatterer: each unit, first, second and third layers each contain both a cylindrical scatterer; a first layer selected cylinder r is the radius of the cavity 1 = 1.5mm, the radius of the cylindrical cav...
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