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Discretized rubber layer photonic crystal shaft with low-frequency vibration-damping characteristics

A technology of phononic crystals and rubber layers, which is applied in the direction of sound-generating devices and instruments, and can solve problems such as difficult engineering applications and single adjustment methods

Inactive Publication Date: 2016-09-07
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the band gap is relatively high (200-1000HZ), and a local resonance structure with a relatively large weight must be added to obtain a low-frequency band gap, which increases the difficulty of engineering application, and can only isolate torsional vibration, and the adjustment method is very simple

Method used

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  • Discretized rubber layer photonic crystal shaft with low-frequency vibration-damping characteristics
  • Discretized rubber layer photonic crystal shaft with low-frequency vibration-damping characteristics
  • Discretized rubber layer photonic crystal shaft with low-frequency vibration-damping characteristics

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Experimental program
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Effect test

Embodiment 1

[0027] n=3, α 1 = α 2 = α 3 = β 1 = β 2 = β 3 =60°, in the range of 0-1500HZ, there are two complete band gaps, such as image 3 shown. The first complete bandgap: 308.7-309.4Hz, the second complete bandgap 325.7-487.6Hz. Bending wave band gap: 321Hz-1018Hz, torsional wave band gap 142Hz-763Hz, longitudinal wave band gap 206Hz-488Hz.

[0028] Figure 4 It is the energy band diagram of the traditional phononic crystal axis. It can be seen that there are two complete band gaps at 0-1500 Hz. The first complete band gap is 357.6-442 kHz. The second complete band gap is 484.5-672.8 Hz. The bending wave band gap 357.5-442Hz and 484-1438Hz, torsional wave band gap 197to1018Hz longitudinal wave band gap 270-680Hz.

Embodiment 2

[0030] n=3, α 1 = 30°, α 2 = 60°, α 3 =90°, β 1 = β 2 = β 3 =60°, in the range of 0-1500HZ, there are two complete band gaps. The first complete bandgap: 330-350Hz, the second complete bandgap 369-502Hz. Bending wave band gap: 330Hz-350Hz, 369-870Hz, torsional wave band gap 142Hz-754Hz, longitudinal wave band gap 209Hz-502Hz.

Embodiment 3

[0032] n=3, α 1 = α 2 = α 3 = 10°, β 1 = β 2 = β 3 =110°, the bending wave has the lowest band gap from 128.6 to 319HZ, the longitudinal wave has the lowest energy band gap from 84-201HZ, and the three elastic wave band gaps are the lowest. The lowest energy bandgap of torsional wave is from 44 to 245HZ. The lowest for full bandgap is from 128.6 to 201HZ.

[0033] Visible, adopt structure of the present invention, can make:

[0034] 1. Bandgap drop

[0035] The introduction of the discrete rubber layer makes the first complete bandgap of the new structure decrease and the width is reduced to a state of almost disappearing, and the second bandgap decreases. The discretization of the rubber layer has a great influence on the bending wave, so that the first band gap of the bending wave disappears and the second band gap moves down; while the band gaps of the torsional wave and the longitudinal wave both show a downward trend, and the shape of the dispersion curve is rough...

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Abstract

The invention discloses a discretized rubber layer photonic crystal shaft with low-frequency vibration-damping characteristics, and the photonic crystal shaft comprises a shaft base body. The outer edge of the shaft base body is coaxially provided with a plurality of periodically distributed rubber layers, and a scatterer is disposed outside the rubber layers. Each rubber layer consists of a plurality of discrete arc rubber segments. The photonic crystal shaft has lower band gap characteristics than a conventional photonic crystal shaft, and has a controllable band gap range for three types of elastic waves. The band gap of the photonic crystal shaft can be adjusted through adjusting the angles and numbers of the rubber arc segments. Moreover, when the number of rubber arc segments remains unchanged and the angle of each rubber arc segment is reduced, the first complete band gap is in a state of gradually disappearing. The photonic crystal shaft provided by the invention has potential values for the precision machinery projects, and can control the low-frequency vibration of a transmission shaft.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a phonon crystal axis of a discretized rubber layer with low-frequency vibration damping characteristics. Background technique [0002] Phononic crystals are a new type of artificial structural functional material. Through design, the transmission of elastic waves can be artificially regulated, and the propagation of elastic waves within the bandgap frequency is forbidden. Phononic crystals have been widely used in noise and vibration isolation, mechanical filters and waveguides. [0003] At present, there are two completely different bandgap mechanisms in phononic crystals, namely the Bragg bandgap mechanism and the local resonance type mechanism. In the Bragg bandgap mechanism, the lattice constant of the phononic crystal is of the same order of magnitude as the forbidden band wavelength of the matrix material, which limits the lattice size of the phon...

Claims

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Application Information

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IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 李丽霞蔡安江解妙霞
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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