Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Underwater sound absorption structure filled with viscous-elastic materials and provided with partition plates arranged in crossed and transversely-enhanced mode

A technology of viscoelasticity and baffles, which is applied in the direction of sound-generating devices and instruments, can solve the problems of poor broadband sound absorption performance, and achieve the effects of improving water pressure resistance, sound absorption performance, and sound wave loss ability

Active Publication Date: 2021-01-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of the prior art, the present invention provides an underwater sound-absorbing structure filled with viscoelastic materials by cross-reinforced transversely arranged partitions. Problem with poor acoustic performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Underwater sound absorption structure filled with viscous-elastic materials and provided with partition plates arranged in crossed and transversely-enhanced mode
  • Underwater sound absorption structure filled with viscous-elastic materials and provided with partition plates arranged in crossed and transversely-enhanced mode
  • Underwater sound absorption structure filled with viscous-elastic materials and provided with partition plates arranged in crossed and transversely-enhanced mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Examples of materials:

[0025] Metal steel: it is treated as rigid in the simulation calculation.

[0026] Viscoelastic material: characterized by a density of 900kg / m 3 , the longitudinal wave velocity is 800m / s, the longitudinal wave loss factor is 0.09, the shear wave velocity is 80m / s, and the shear wave loss factor is 0.9.

[0027] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0028] The structural dimensions of embodiment and comparative example:

[0029] With reference to Fig. 1 (b), in order to guarantee the objectivity of contrast, the thickness of embodiment and comparative example h keep consistent as h =50mm, the width of the cell is a =25mm. Partition thickness t =2mm, horizontal cross d =12.5mm, the longitudinal distance between the intersecting transversely reinforced partitions is c =12.5mm, in the discussion, the length of the intersecting horizontally reinforced partitions is respectively taken as b =0.0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an underwater sound absorption structure filled with a viscous-elastic material and provided with partition plates arranged in crossed and transversely-enhanced mode. The structure comprises a bottom plate, a plurality of vertical partition plates distributed at equal intervals are rigidly connected to the bottom plate, a cell is formed between every two adjacent vertical partition plates, and a plurality of horizontal partition plates are distributed in each cell and are filled with the viscous-elastic materials with the density of 500 kg / m<3>-1000 kg / m<3>; the horizontal partition plates comprise left partition plates in rigid connection with the left vertical partition plates and right partition plates in rigid connection with the right vertical partition plates,and the left partition plates and the right partition plates are distributed in a staggered mode in the vertical direction. Through reasonable design of the structure, the underwater sound absorptionperformance of the viscous-elastic material is improved, and the problem that the broadband sound absorption performance is poor is solved.

Description

technical field [0001] The invention relates to the field of design of underwater sound-absorbing composite structures, in particular to an underwater sound-absorbing structure filled with viscoelastic material by cross-reinforced and arranged partitions. Background technique [0002] Compared with the sound-absorbing structure in the air environment, underwater sound absorption has always been a more difficult problem due to the higher sound velocity in water and the lower water viscosity. Viscoelastic materials are often used for underwater sound absorption. Viscoelastic materials such as rubber or polyurethane are composed of polymer materials. Under the excitation of sound waves, the molecular chains rub against each other to generate energy loss. Due to the strong penetrating ability of low-frequency sound waves, thicker thicknesses or resonant structures are required to absorb low-frequency sound waves. For example, Alberich-type sound-absorbing coverings introduce cav...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 卢天健辛锋先于晨磊段明宇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com