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

Fractal sound absorbing superstructure

A superstructure and fractal technology, applied in the direction of sound-emitting devices, building components, building structures, etc., can solve problems such as expensive, unfavorable air circulation, thick sound-absorbing materials, etc.

Active Publication Date: 2016-12-07
HUNAN UNIV
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this noise reduction method will create a confined space, which is not conducive to the circulation of air in the confined space and the outside
In addition, if a better noise reduction effect is required, the selected sound-absorbing material is generally thick and expensive

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
  • Fractal sound absorbing superstructure
  • Fractal sound absorbing superstructure
  • Fractal sound absorbing superstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] figure 1 A fractal sound-absorbing superstructure is presented. The fractal sound-absorbing superstructure is a regular hexagon. 1 is the air domain of the fractal sound-absorbing superstructure. There are six equilateral triangular structures (2, 3, 4, 5, 6 and 7) on the periphery of the air domain, and the materials of the structures are relatively rigid materials (such as steel and aluminum alloy, etc.). The equilateral triangle structure contains the "zigzag" fractal sound wave channel. The first level fractal of the “zigzag” fractal sound wave channel is the “zigzag” fractal sound wave channel 10 constructed by the main frame 9 . The second level fractal of the "zigzag" fractal sound wave channel is the "zigzag" fractal sound wave channel 12 of all the structures of the subframe 11 derived from the main frame 9 . The third-level fractal of the “zigzag” fractal sound wave channel is the “zigzag” fractal sound wave channel 14 constructed by the third-level frame ...

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 discloses a fractal sound absorbing superstructure comprising a regular hexagonal air region 1 and six equilateral triangular structures (2, 3, 4, 5, 6 and 7). Each equilateral triangle structure has a zigzag fractal acoustic wave channel comprising a first-level zigzag fractal acoustic channel 10, a second-level zigzag fractal acoustic wave channel 12 deriving from the first-level zigzag fractal acoustic wave channel 10, and a third-level zigzag fractal acoustic wave channel 14 deriving from the second-level zigzag fractal acoustic wave channel 12. Both ends of the zigzag fractal acoustic wave channel communicate with an external sound field 8 and the internal hexagonal air region 1, respectively. The fractal sound absorbing superstructure of the invention has two complete band gaps at low frequency, has a unipolar resonance and bipolar resonance phenomenon at the low frequency. The complete band gap, the unipolar resonance and the bipolar resonance make acoustic energy gather in the fractal sound absorbing superstructure and stop the acoustic wave from spreading forwards.

Description

technical field [0001] The invention relates to acoustic Mie resonance, sound-absorbing technology and acoustic superstructure, in particular to a fractal sound-absorbing superstructure. Background technique [0002] Sound-absorbing and noise-reducing materials can be used in many occasions, such as noise reduction in cabins of transportation vehicles such as automobiles, airplanes, high-speed rail, and ships, noise reduction in buildings, noise reduction in household appliances such as indoor air conditioners, and so on. Taking the noise reduction design of a building as an example, it is generally necessary to use an airtight method to separate the indoor space and outdoor space of the building, and use suitable sound-absorbing materials to absorb the noise transmitted from the outdoors to the indoors. However, this noise reduction method will create a confined space, which is not conducive to the circulation of air in the confined space and the outside. In addition, if a...

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): G10K11/172E04B1/84
CPCE04B1/84E04B2001/8428G10K11/172
Inventor 夏百战李丽萍刘坚于德介
Owner HUNAN UNIV
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