Covering layer diffuse reflection type sound absorption superstructure unit and superstructure

A technology of diffuse reflection and super structure, which is applied in the direction of sounding equipment, defense equipment, instruments, etc., to achieve the effect of simple structure, reducing the overall signal characteristics, and reducing the intensity

Pending Publication Date: 2022-03-01
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Broadband perfect sound absorption of underwater acoustics remains a challenge in the subwavelength range

Method used

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  • Covering layer diffuse reflection type sound absorption superstructure unit and superstructure
  • Covering layer diffuse reflection type sound absorption superstructure unit and superstructure
  • Covering layer diffuse reflection type sound absorption superstructure unit and superstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment discloses a two-dimensional cover layer diffuse reflection low-frequency broadband sound-absorbing superstructure, including: a substrate 1, a cover layer diffuse reflection sound-absorbing superstructure unit 2; figure 1 Shown is a cross-sectional schematic diagram of a diffuse reflection low-frequency broadband sound-absorbing superstructure composed of eight two-dimensional covering layer diffuse reflection low-frequency broadband sound-absorbing superstructure units 2;

[0030] In this embodiment, the two-dimensional cover layer diffuse reflection low-frequency broadband sound-absorbing superstructure is composed of 40 cover layer diffuse reflection sound-absorbing superstructure units 2 and a substrate 1, and the cover layer diffuse reflection sound-absorbing superstructure unit 2 is made of resin layer 3 and an air cavity 4, the thickness of each covering layer diffuse reflection sound-absorbing superstructure unit 2 is 6cm, and the width is 10cm; ...

Embodiment 2

[0040] This embodiment 2 is the covering layer diffuse reflection low frequency broadband sound-absorbing superstructure with 8 kinds of three-dimensional covering layer diffuse reflection low-frequency broadband sound-absorbing superstructure units 2 on the basis of embodiment 1. In this embodiment, the three-dimensional Cover layer diffuse reflection type low-frequency broadband sound-absorbing superstructure stretches on the basis of embodiment 1, and it is as in embodiment 1 figure 1 The cross-section shown is the same, and the overall structure is as Figure 4 shown;

[0041] In Embodiment 2, the working performance of the three-dimensional covering layer diffuse reflection low-frequency broadband sound-absorbing superstructure can be approximately equivalent to that of an infinitely long two-dimensional covering layer diffuse reflection low-frequency broadband sound-absorbing superstructure. Therefore, Figure 5 and Figure 6 It can also be the far-field pattern of the ...

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Abstract

The invention discloses a covering layer diffuse reflection type sound absorption superstructure unit and a superstructure. The superstructure comprises a plurality of covering layer diffuse reflection type superstructure units and a substrate, wherein the covering layer diffuse reflection sound absorption superstructure unit comprises a resin layer and an air cavity; the resin layer wraps the air cavity with the notch; the plurality of covering layer diffuse reflection type superstructure units are aperiodically arranged on the substrate; the multiple covering layer diffuse reflection sound absorption superstructure units arranged on the substrate cover the-pi-pi discrete phase shift. Within a sub-wavelength range, the sound absorption superstructure can realize perfect sound absorption of a broadband, can realize an efficient diffuse reflection effect on underwater sound waves in a low-frequency band, can reduce the strength of a forward echo signal, can reduce the overall signal characteristics, and can realize a stealth effect. Compared with a traditional cavity type acoustic material, the acoustic material has the advantages of being simple in structure, good in performance, low in weight, aperiodic, free of a damping layer and capable of losing the damping characteristic of the acoustic material.

Description

technical field [0001] The invention relates to the technical field of underwater sound absorption, in particular to a covering layer diffuse reflection low-frequency broadband sound-absorbing superstructure unit and a superstructure. Background technique [0002] The underwater acoustic sound-absorbing cladding is a ship's underwater acoustic material and structure laid on the surface of the ship's structure between the hull and seawater. It can not only suppress the vibration of the hull, reduce the noise generated by mechanical vibrations other than the propulsion system, and reduce the radiation intensity of the ship's target characteristic signal; it can also absorb the detection waves of the enemy's active sonar and reduce the intensity of the ship's acoustic target. Therefore, laying an acoustic covering layer on the structure, as the last barrier of the ship's acoustic stealth, has become an effective means to simultaneously improve the performance of the ship's acti...

Claims

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Application Information

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IPC IPC(8): B63G13/02G10K11/20G10K11/168
CPCB63G13/02G10K11/205G10K11/168B63G2013/022G10K11/172Y02T90/00
Inventor 李瑞琛朱蓉蓉郑斌陈红胜
Owner ZHEJIANG UNIV
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