Petal-shaped inner insertion pipe type underwater Helmholtz resonance cavity structure
An inner tube and petal-shaped technology is applied in the field of petal-shaped inner tube type underwater Helmholtz resonance cavity structure, and can solve the problems of poor low-frequency sound absorption performance, poor lightweight performance, difficult processing and manufacturing, etc. , to achieve excellent low-frequency sound absorption performance, improved acoustic impedance characteristics, good bearing performance and lightweight performance.
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[0047] Examples of materials:
[0048] Structural steel: characterized by a density of 7850kg / m 3 , Young's modulus 200GPa, Poisson's ratio 0.2.
[0049] Water: characterized by a density of 1000kg / m 3 , sound velocity 1500m / s, dynamic viscosity coefficient 0.00101Pa·s.
[0050] Rubber: characterized by a density of 1100kg / m 3 , Young's modulus 10MPa, Poisson's ratio 0.49, loss factor 0.2.
[0051] Structural dimensions and material selection of comparative examples:
Embodiment 1
[0056] The diameter of the cavity is 30mm, the height of the cavity is 30mm, the diameter of the petal-shaped inner tube is 3mm, the relative roughness of the petal-shaped inner tube is 0.15, the space wave number of the petal-shaped inner tube is 4, the length of the petal-shaped inner tube is 25mm, and the thickness of the damping inner lining 2mm.
Embodiment 2
[0058] The diameter of the cavity is 40mm, the height of the cavity is 40mm, the diameter of the petal-shaped inner tube is 4mm, the relative roughness of the petal-shaped inner tube is 0.2, the space wave number of the petal-shaped inner tube is 6, the length of the petal-shaped inner tube is 30mm, and the thickness of the damping inner lining 3mm.
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