Acoustic topological insulator

A technology of topological insulators and regular triangular prisms, applied in the direction of sound-generating devices and instruments, can solve problems such as difficult control, damage to the one-way edge state effect of acoustic metamaterials, and affect the value of engineering applications, and achieve good robustness.

Active Publication Date: 2018-10-02
HUNAN UNIV
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter it is the air flow circulation or the gyroscope rotation, it is difficult to control the synchronous and coordinated work. Any potential external disturbance may cause changes in the air flow state and rotational motion, thereby destroying t

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
  • Acoustic topological insulator
  • Acoustic topological insulator
  • Acoustic topological insulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] figure 1 An acoustic topological insulator structure is presented. Acoustic topological insulator 1 is composed of regular hexagonal plate 2 and regular triangular prism 3 . The square plate 2 is evenly arranged with 400 circular holes 4 in a triangular lattice. The lower part of the regular triangular prism 3 is a bolt structure 6 . The regular triangular prism 3 is periodically fixed on the regular hexagonal 2 flat plate with a nut 7 according to the triangular lattice. The regular triangular prism is divided into four parts, the upper left part 7 and the lower right part 8 rotate 30 degrees in the clockwise direction, and the lower left part 9 and the upper right part 10 rotate 30 degrees in the counterclockwise direction. The domain walls of the four-part regular triangular prism form the cross acoustic topological boundary. The boundary is divided into four sections, namely topological boundaries 11 , 12 , 13 and 14 .

[0022] The working principle of the acou...

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

An acoustic topological insulator structure 1 is composed of a regular hexagon flat plate 2 and regular triangular prisms 3, the regular triangular prisms 3 are periodically arranged on the regular hexagon flat plate 2 according to triangular lattices, the regular triangular prisms 3 are divided to four parts, a left upper part 7 and a right lower part 8 rotate for 30 DEG in a clockwise mode, anda left lower part 9 and a right upper part 10 rotate for 30 DEG in an anticlockwise mode. The regular triangular prisms 3 of the acoustic topological insulator left rotate for 30 DEG to 0 DEG and thenright rotate for 30 DEG, the band gaps between double-degeneration energy bands are decreased gradually, a double-degeneration Dirac point is finally formed through integration, the double-degeneration Dirac point is then opened, and becoming larger gradually along with increasing of the rotating angle is achieved. When the double-degeneration energy band of the acoustic topological insulator isopened, closed and then re-opened, insulator energy band inversion and topological phase transformation can be completed, and pseudo-rotation effects are realized. The acoustic topological insulator uses the pseudo-rotation effects to realize acoustic topological robust unidirectional transmission, and a prototype device such as an acoustic splitter 1 is designed.

Description

technical field [0001] The invention relates to the accidental degenerate double Dirac point of the phonon crystal, the pseudo-rotation effect of the phonon crystal, sound propagation control and noise reduction and sound insulation technology, and in particular to an acoustic topological insulator based on a triangular lattice. Background technique [0002] The nature of vibration and noise is not only an important index to measure the comfort of people's daily work and living environment, but also an important technical index to measure the comprehensive performance of aircraft, passenger cars, machine tools and other large mechanical equipment. It is also important in the field of military defense. meaning. The study of phononic crystals opens a new chapter for artificially manipulating wave propagation in elastic media and structures. According to the Bloch theory of periodic structures ω(π / a)=ω(-π / a), the energy bands of ordinary acoustic metamaterials are continuous 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
IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 夏百战刘亭亭
Owner HUNAN UNIV
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