Multilayer material combined cavity anechoic tile

A technology of multi-layer materials and sound-absorbing tiles is applied in the field of vibration reduction and noise reduction, which can solve the problems of poor sound absorption effect and narrow sound reduction frequency band, and achieve the effects of improving low-frequency sound absorption performance, reducing cost, and reducing complexity.

Inactive Publication Date: 2016-06-01
NAVAL UNIV OF ENG PLA
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned anechoic tiles can have a good anechoic effect in a certain frequency range, but the an

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
  • Multilayer material combined cavity anechoic tile
  • Multilayer material combined cavity anechoic tile
  • Multilayer material combined cavity anechoic tile

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] The invention will be further introduced below in conjunction with the drawings and specific implementations:

[0024] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, a multi-layer material composite cavity anechoic tile includes a surface layer 1, a perforated layer 2, and a base layer 3. Wherein, the surface layer 1 is in contact with the medium water, and the surface layer 1 is made of sound-transmitting polyurethane elastomer. When the sound wave is incident, the acoustic impedance of the sound-transmitting polyurethane elastomer matches the acoustic impedance of the water, so that the enemy's active sonar sound waves can Maximize the incidence to reduce the reflection of sound waves. The perforated layer 2 is made of polyurethane double-layer composite foam sound-absorbing material, and the incident sound waves are converted into heat energy and dissipated through the waveform conversion and energy dissipation of the combined cavity and the polyurethan...

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 relates to a multilayer material combined cavity anechoic tile which consists of a surface layer, a punching layer and a base layer, wherein mixed type cavity structures consisting of circular-table-shaped cavities and horn-shaped cavities are arranged in the punching layer in an arrayed manner; a punching rate of the circular-table-shaped cavities is 10-20%; a punching rate of the horn-shaped cavities is 1-2%; each mixed type cavity structure consists of one circular-table-shaped cavities and two to six horn-shaped cavities; the surface layer is made of sound transmission polyurethane elastomer; the punching layer is made of polyurethane double-layer compound foam sound absorption material; the base layer is made of butyl rubber matched with the impedance of a housing of an underwater navigation vehicle; and the surface layer, the punching layer and the base layer are glued through an adhesive sequentially, and are subjected to integrated cold-press moulding.

Description

technical field [0001] The invention relates to a noise reduction device, in particular to a noise reduction tile with a composite cavity structure of multi-layer materials, which belongs to the field of vibration reduction and noise reduction. Background technique [0002] Underwater vehicles will produce mechanical noise, propeller noise and hydrodynamic noise when moving underwater. If the noise is too loud, it will be easily detected by enemy sonar, thus affecting its concealment and safety. In order to reduce the detection range of the enemy's sonar and increase the range of its own sonar, laying anechoic tiles on the shell of the underwater vehicle is a very effective measure. Anechoic tiles with good performance can not only absorb most of the enemy's active Sonar detects sound waves and can suppress the outward propagation of its own noise. [0003] At present, the acoustic tiles of underwater vehicles are mostly made of a single or multi-layer rubber material with ...

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
IPC IPC(8): B63G8/39G10K11/16G10K11/168
CPCB63G8/39G10K11/16G10K11/168
Inventor 楼京俊杨庆超刘国强李爽刘树勇
Owner NAVAL UNIV OF ENG PLA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap