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Pyramid lattice reinforced cavity type underwater sound absorption structure

A technology of lattice structure and pyramid, which is applied in the direction of sound-emitting devices and instruments, to achieve excellent sound absorption performance, improve mechanical properties, and good water pressure resistance

Active Publication Date: 2019-08-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a pyramid-shaped lattice enhanced cavity-type underwater sound-absorbing structure to solve the problem of deformation of the traditional cavity-type sound-absorbing coating under high hydrostatic pressure and cause Acoustic performance degradation or even failure problems

Method used

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  • Pyramid lattice reinforced cavity type underwater sound absorption structure
  • Pyramid lattice reinforced cavity type underwater sound absorption structure
  • Pyramid lattice reinforced cavity type underwater sound absorption structure

Examples

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Embodiment 1

[0055] The thickness of the panel is 1.5mm, the thickness of the damping layer is 23mm, the cell side length is 40mm, the radius of the diagonal rod is 1.5mm, the length of the diagonal rod is 33mm, the angle between the diagonal rod and the upper and lower panels is 45°, the radius of the upper surface of the cavity is 5mm, and the lower surface of the cavity Radius 20mm, cavity height 5mm.

Embodiment 2

[0057] The thickness of the panel is 2mm, the thickness of the damping layer is 35mm, the cell side length is 60mm, the radius of the diagonal rod is 2mm, the length of the diagonal rod is 50mm, the angle between the diagonal rod and the upper and lower panels is 45°, the radius of the upper surface of the cavity is 15mm, and the radius of the lower surface of the cavity is 30mm , The cavity height is 10mm.

Embodiment 3

[0059] The thickness of the panel is 2.5mm, the thickness of the damping layer is 27mm, the cell side length is 50mm, the radius of the diagonal rod is 2.5mm, the length of the diagonal rod is 38mm, the angle between the diagonal rod and the upper and lower panels is 45°, the radius of the upper surface of the cavity is 10mm, and the lower surface of the cavity Radius 25mm, cavity height 7.5mm.

[0060] Adopt above-mentioned material and structure dimension to carry out numerical simulation, the result that provides embodiment is as follows:

[0061] In terms of the mechanical properties of the present invention, please refer to figure 2 (a) is the relationship between the compressive load and the equivalent strain borne by three embodiments of a pyramid-shaped lattice reinforced cavity-type underwater sound-absorbing structure. It can be seen from the figure that the compressive load borne by the present invention has a linear relationship with the equivalent strain, and th...

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Abstract

The invention discloses a pyramid lattice reinforced cavity type underwater sound absorption structure which comprises cells.A pyramid lattice structure is arranged in each cell; a cavity is formed inthe pyramid lattice structure; and a plurality of cell arrays are arranged to form the pyramid lattice reinforced cavity type underwater sound absorption structure. The pyramid lattice reinforced cavity type underwater sound absorption structureis excellent in sound absorption performance and good in water pressure resistance, the lightweight design of the underwater sound absorption structure isrealized meanwhile, and thepyramid lattice reinforced cavity type underwater sound absorption structure is a kind of multifunctional integrated structure with load bearing-sound absorption-lightweight.

Description

technical field [0001] The invention belongs to the technical field of underwater sound absorption, and in particular relates to a pyramid-shaped lattice-enhanced cavity-type underwater sound-absorbing structure. Background technique [0002] Sound waves are currently the only communication method that can transmit information over long distances underwater. Therefore, the shock and noise reduction of underwater detectors, submersibles and other equipment has always been a major engineering problem. Alberich-type sound-absorbing cladding and local resonance-type phononic crystals, as two typical underwater sound-absorbing structures, have been widely studied and applied in recent years. However, due to the lightweight design requirements, the Alberich-type sound-absorbing cladding with lighter density, simpler structure and better low-frequency sound absorption performance has broader research value and engineering application prospects. [0003] The above-mentioned Alberic...

Claims

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Application Information

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IPC IPC(8): G10K11/168
CPCG10K11/168
Inventor 卢天健辛锋先段明宇于晨磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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