Unlock instant, AI-driven research and patent intelligence for your innovation.

Continuously-variable-impedance functionally graded material and homogenous medium periodic structure material

A technology of functionally graded materials and periodic structures, applied in the direction of sound-generating devices, instruments, etc., can solve the problems of bandgap width reduction and bandgap initial frequency reduction, etc., and achieve the effect of simple manufacturing process and strong designability

Active Publication Date: 2015-07-29
HARBIN ENG UNIV
View PDF7 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure is that two functionally graded materials are periodically arranged into a phononic crystal, and the functionally graded material satisfies a symmetrical distribution within a period. This structure effectively avoids problems such as fatigue and stress concentration in the phononic crystal. The bandgap starting frequency of the traditional structure is reduced, but the range of the bandgap starting frequency is limited, and the bandgap width is also reduced accordingly, and more passbands appear in the same range

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
  • Continuously-variable-impedance functionally graded material and homogenous medium periodic structure material
  • Continuously-variable-impedance functionally graded material and homogenous medium periodic structure material
  • Continuously-variable-impedance functionally graded material and homogenous medium periodic structure material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the homogeneous medium is selected as copper, and the functionally graded material with continuously changing impedance and copper are both cylindrical, and the impedance of copper is 46.25×10 6 kg / [s m 2 ], the impedance distribution of functionally graded materials with continuously changing impedance is as figure 2 shown. image 3 It is the bandgap comparison result of the traditional periodic structure composed of rubber and copper and the functionally graded material with continuously changing impedance and the periodic structure composed of copper. It can be seen that the bandgap starting frequency of the traditional periodic structure is 7.5kHz, the cutoff frequency is 35kHz, and the bandgap width is 27.5kHz, while the bandgap starting frequency of the periodic structure composed of functionally graded materials with continuously changing impedance and copper is The initial frequency is 1kHz, the cut-off frequency is 38kHz, and the bandgap ...

Embodiment 2

[0024] In this embodiment, the homogeneous medium is selected as copper, the functionally graded material with continuously changing impedance and copper are both cylindrical, and the impedance value of the functionally graded material with continuously changing impedance is changed so that its impedance distribution satisfies a linearly increasing distribution, as Figure 4 shown. Figure 5 It is the bandgap comparison result of the traditional periodic structure composed of rubber and copper and the functionally graded material with continuously changing impedance and the periodic structure composed of copper. It can be seen that the bandgap starting frequency of the traditional periodic structure increases to 8.5kHz, the cutoff frequency increases to 45kHz, and the bandgap width is 36.5kHz, while the functionally graded material with continuously changing impedance and the periodic structure composed of copper The starting frequency of the bandgap is 0.5kHz, the cutoff freq...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a continuously-variable-impedance functionally graded material and homogenous medium periodic structure material which is a periodic structure formed by continuously-variable-impedance functionally graded material and a homogenous medium according to periodic arrangement. A low-frequency band gap can be acquired via a relatively small periodic size so that the manufacturing technology is simple, designability is high, material selection range is relatively wide and thus the periodic structure material is suitable for being applied to the aspect of low-frequency vibration damping and noise reduction.

Description

technical field [0001] The invention relates to a periodic structure, in particular to a vibration-damping and sound-insulating periodic structure material in the field of vibration-damping and noise-reducing technology. Background technique [0002] In various fields such as mechanical power, aerospace, and ship engineering, periodic structures are often encountered as an acoustic structure. A periodic structure is composed of two or more elastic materials according to a certain periodicity. One of its important features is that it has an acoustic band gap, which can prevent certain frequencies of elastic waves from passing through. That is, the propagation of vibration in this frequency range is suppressed. However, the bandgap frequency of the periodic structure based on the Bragg scattering mechanism decreases monotonously with the increase of the period size, so it is difficult to obtain a low-frequency bandgap under the condition of a small period size, and the materi...

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
Inventor 胡博杨德森时胜国时洁朱中锐张揽月孙玉方尔正王开举
Owner HARBIN ENG UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com