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Underwater sound insulation metamaterial based on chiral structure

A chiral structure and metamaterial technology, which is applied in sound-producing equipment, hull design, instruments, etc., can solve problems such as insufficient low-frequency acoustic performance, and achieve the effect of improving low-frequency sound insulation performance, good engineering application prospects, and good tunability.

Pending Publication Date: 2022-07-08
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a chiral structure-based underwater acoustic sound insulation metamaterial, which is used to overcome defects such as insufficient low-frequency acoustic performance in the prior art

Method used

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  • Underwater sound insulation metamaterial based on chiral structure
  • Underwater sound insulation metamaterial based on chiral structure
  • Underwater sound insulation metamaterial based on chiral structure

Examples

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Effect test

Embodiment 1

[0049] This embodiment provides an underwater sound insulation metamaterial based on a chiral structure, and the partial structural cross section of the underwater sound insulation metamaterial is as follows: Figure 4 As shown, the cover plate 10 and the sound insulation layer 20 are made of aluminum, the elastic modulus E=69GPa, the Poisson’s ratio η=0.33, and the density is ρ=2700kg / m 3 , the overall thickness of the underwater sound insulation metamaterial is a=32.52mm. Cover plate thickness c=2mm. The wall thickness of the sound insulation unit, the circular arc of the central surface of the sound insulation unit, the arcs where the first circular arc surface 301 and the second circular arc surface 302 are located correspond to the same central angle The corresponding arc radii are: r=2.69mm, The distance between the head end and the tail end of the central plane arc between the first circular arc surface 301 and the second circular arc surface 302 The tail end of...

Embodiment 2

[0052] This embodiment provides an underwater sound insulation metamaterial based on a chiral structure, and the partial structural cross section of the underwater sound insulation metamaterial is as follows: Figure 5 As shown, the cover plate 10 and the sound insulation layer 20 are made of aluminum, the elastic modulus E=69GPa, the Poisson’s ratio η=0.33, and the density is ρ=2700kg / m 3 , the overall thickness of the underwater sound insulation metamaterial is a=32.52mm. Cover plate thickness c=2mm. The wall thickness of the sound insulation unit is t=0.7mm, and the circular arc of the central surface of the sound insulation unit, the arc where the first circular arc surface 301 and the second circular arc surface 302 are located corresponds to the same central angle The corresponding arc radii are: r=3.16mm, The distance between the head end and the tail end of the central plane arc between the first circular arc surface 301 and the second circular arc surface 302 ...

Embodiment 3

[0055] This embodiment provides an underwater sound insulation metamaterial based on a chiral structure, and the partial structural cross section of the underwater sound insulation metamaterial is as follows: Image 6 As shown, the cover plate 10 and the sound insulation layer 20 are made of aluminum, the elastic modulus E=69GPa, the Poisson’s ratio η=0.33, and the density is ρ=2700kg / m 3 , the overall thickness of the underwater sound insulation metamaterial is a=32.52mm. Cover plate thickness c=2mm. The wall thickness of the sound insulation unit is t=0.7mm, and the circular arc of the central surface of the sound insulation unit, the arc where the first circular arc surface 301 and the second circular arc surface 302 are located corresponds to the same central angle The corresponding arc radii are: r=3.93mm, The distance between the head end and the tail end of the central plane arc between the first circular arc surface 301 and the second circular arc surface 302 T...

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Abstract

The invention discloses an underwater sound insulation metamaterial based on a chiral structure, and the underwater sound insulation metamaterial forms a sound insulation layer with a chiral structure through the design of sound insulation units and the array periodic arrangement of sound insulation components. The chiral structure is similar to the left hand and the right hand of human, and does not coincide with the body after mirroring. In addition, compared with a symmetrical concave structure, the chiral structure can achieve large deformation. The supernormal physical effect which a conventional material and a symmetrical structure do not have can be obtained by utilizing the asymmetric characteristic and the deformation mechanism of the chiral structure. Starting from a quasi-static impedance mismatch mechanism and based on a chiral structure, geometric parameters of a sound insulation layer structure are optimized to obtain the underwater sound insulation metamaterial, under the condition that the thickness of the metamaterial is not larger than 35 mm, the sound insulation performance of the low-frequency band of 200-2000 Hz can be effectively improved, a sound insulation peak has high tunability, and the sound insulation performance of the metamaterial is greatly improved. The method can be applied to noise control of underwater equipment and other fields, and has a good engineering application prospect.

Description

technical field [0001] The invention relates to the technical field of underwater equipment vibration and noise control, in particular to an underwater sound insulation metamaterial based on a chiral structure. Background technique [0002] Acoustic stealth is one of the important indicators to measure the performance of underwater equipment. The sound insulation material laid on the surface of underwater equipment can effectively block the path of the internal noise of the equipment to propagate outward and reduce the radiated noise of the equipment itself. Underwater sound insulation technology is to block the noise transmission on the noise propagation path, and it is one of the important means in vibration and noise control. The sound insulation mechanism of underwater sound insulation materials is roughly divided into two aspects: one is that the acoustic impedance of the sound insulation material is very different from that of water, resulting in a serious impedance mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16
CPCG10K11/161Y02T70/10
Inventor 赵宏刚王超王洋杨海滨肖勇钟杰尹剑飞郁殿龙温激鸿
Owner NAT UNIV OF DEFENSE TECH
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