Viscous-elastic material transverse partition plate partition underwater sound absorption structure
A transverse baffle, viscoelastic technology, applied in the direction of sound-producing equipment, instruments, etc., to achieve good underwater sound absorption performance, improve water pressure resistance, and simple structure.
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[0047] Example 1
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[0048] Examples of materials:
[0049] Metal steel: characterized by a density of 7850kg / m 3 , Young's modulus 205GPa, Poisson's ratio 0.28.
[0050] Viscoelastic material: It is characterized by a density of 900kg / m3, a longitudinal wave velocity of 900m / s, a longitudinal wave loss factor of 0.09, a shear wave velocity of 100m / s, and a shear wave loss factor of 0.9.
[0051] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.
[0052] Structural dimensions of examples and comparative examples:
[0053] see figure 2 , (a) is a uniform viscoelastic material of equal thickness, (b) is a viscoelastic material with fixed cell walls, (c) is a viscoelastic material with transverse partitions, and the lengths of the transverse partitions are the same, (d) ) set up three transverse partitions with different lengths, and the transverse partitions become longer and longer from top to bottom. The distance between the three partitions is equal. In order...
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[0054] Example 2
[0055] Examples of materials:
[0056] Metal steel: characterized by a density of 7850kg / m 3 , Young's modulus 205GPa, Poisson's ratio 0.28.
[0057] Viscoelastic material: characterized by a density of 900kg / m 3 , the longitudinal wave velocity is 1200m / s, the longitudinal wave loss factor is 0.2, the shear wave velocity is 120m / s, and the shear wave loss factor is 0.9.
[0058] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.
[0059] Structural dimensions of examples and comparative examples:
[0060] see figure 2 , (a) is a comparative example of uniform viscoelastic material of equal thickness, (b) is a viscoelastic material with fixed cell walls, (c) is a viscoelastic material with transverse baffles, and the lengths of the transverse baffles are the same, (d) Three transverse partitions with different lengths are arranged, and the transverse partitions become longer and longer from top to bottom. The distances b...
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