Square honeycomb composite underwater sound absorption structure with built-in air layer
A technology of honeycomb structure and air layer, which is applied in the direction of sound-generating devices, layered products, metal layered products, etc., to achieve the effect of improving sound wave loss ability, water pressure resistance ability and sound absorption performance
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Embodiment 1
[0054] Metal steel: It is characterized by a density of 7850kg / m3, a Young's modulus of 2.05GPa, and a Poisson's ratio of 0.28.
[0055] Viscoelastic material: characterized by a density of 1000kg / m 3 , the longitudinal wave velocity is 1000m / s, the longitudinal wave loss factor is 0.3, the shear wave velocity is 100m / s, and the shear wave loss factor is 0.9.
[0056] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.
[0057] Air: characterized by a density of 1.29kg / m 3 , the speed of sound is 340m / s.
[0058] Embodiment structure size:
[0059] Honeycomb cell size: a=20mm. Metal plate thickness: t=1mm. Air layer thickness: h 1 = 5 mm. Honeycomb rubber mixed layer thickness: h 2 = 40mm. Thickness of upper pure rubber covering layer: h 3 = 5 mm.
Embodiment
[0061] Examples of materials:
[0062] Metal steel: It is characterized by a density of 7850kg / m3, a Young's modulus of 2.05GPa, and a Poisson's ratio of 0.28.
[0063] Viscoelastic material: characterized by a density of 900kg / m 3 , the longitudinal wave velocity is 1200m / s, the longitudinal wave loss factor is 0.09, the shear wave velocity is 100m / s, and the shear wave loss factor is 0.9.
[0064] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.
[0065] Air: characterized by a density of 1.29kg / m 3 , the speed of sound is 340m / s.
[0066] Embodiment structure size:
[0067] Honeycomb cell size: a=25mm. Metal plate thickness: t=1mm. Air layer thickness: h 1 = 6mm. Honeycomb rubber mixed layer thickness: h 2 = 50mm. Thickness of upper pure rubber covering layer: h 3 = 4 mm.
Embodiment 3
[0069] Examples of materials:
[0070] Metal steel: It is characterized by a density of 7850kg / m3, a Young's modulus of 2.05GPa, and a Poisson's ratio of 0.28.
[0071] Viscoelastic material: characterized by a density of 800kg / m 3 , the longitudinal wave velocity is 800m / s, the longitudinal wave loss factor is 0.15, the shear wave velocity is 80m / s, and the shear wave loss factor is 0.8.
[0072] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.
[0073] Air: characterized by a density of 1.29kg / m 3 , the speed of sound is 340m / s.
[0074] Embodiment structure size:
[0075] Honeycomb cell size: a=20mm. Metal plate thickness: t=1mm. Air layer thickness: h 1 = 4 mm. Honeycomb rubber mixed layer thickness: h 2 = 35mm. Thickness of upper pure rubber covering layer: h 3 = 2mm.
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