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Mechanical metamaterial fluctuation device with active regulation and control function

A metamaterial, active technology, applied in non-rotational vibration suppression, electrical components, antennas, etc., to achieve the effect of vibration protection

Inactive Publication Date: 2020-08-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there is a defect in the structure, the propagation of the elastic wave will be localized at the defect or propagate along the defect

Method used

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  • Mechanical metamaterial fluctuation device with active regulation and control function
  • Mechanical metamaterial fluctuation device with active regulation and control function
  • Mechanical metamaterial fluctuation device with active regulation and control function

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] By changing the geometric and material parameters of the artificial periodic structure, the propagation characteristics of the elastic wave band of the periodic structure can be artificially regulated. Embodiment 1 of the present invention proposes a wave concentration device for actively regulating mechanical metamaterials. Since the equivalent elastic modulus of piezoelectric sheets can be regulated through a negative capacitance circuit, such mechanical metamaterials can be changed through active control. , so as to realize the active control of elastic wave propagation characteristics. The first embodiment provides an active control method, which can form point defects in the mechanical metamaterial to achieve the purpose of energy concentration.

[0027] The scheme adopted by the point defect wave energy concentrating device in the mechanical metamaterial of the first embodiment is as follows: Figure 1a As shown in the figure, the equivalent elastic modulus of the...

Embodiment 2

[0041] By changing the geometric and material parameters of the artificial periodic structure, the propagation characteristics of the elastic wave band of the periodic structure can be artificially regulated. The second embodiment proposes a metamaterial wave line defect device that actively regulates bending waves. Since the equivalent elastic modulus of the piezoelectric sheet can be regulated through the negative capacitance circuit, the plate elastic wave ultrasonic wave can be changed through active control. The internal parameters of the material can be used to actively control the propagation characteristics of elastic waves. The second embodiment provides an active control method, which can form line defects in the plate elastic wave metamaterial to achieve the purpose of controlling the propagation direction of the bending wave.

[0042] The scheme adopted by the metamaterial wave line defect device for actively regulating bending waves in the second embodiment is as ...

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Abstract

The invention discloses a mechanical metamaterial fluctuation device with an active regulation and control function. The mechanical metamaterial fluctuation device comprises a base plate, a piezoelectric plate and a negative capacitance circuit; and the base body plate is of a plate-shaped structure made of ABS materials and is hung on a support through a rope, a clamp is installed on one side ofthe base body plate, the piezoelectric patches of rectangular structures are periodically pasted on the front face and the back face of the base body plate respectively, and each piezoelectric patch is connected with a negative capacitance circuit to form a periodic structure capable of conducting active regulation and control.

Description

technical field [0001] The invention relates to the technical field of artificial elastic wave metamaterials, in particular to a mechanical metamaterial wave energy device with an external negative capacitance circuit adjustment function. Background technique [0002] Since the 1990s, based on the need to regulate the behavior of elastic waves in structures / materials, the study of the propagation characteristics of elastic waves and vibrations in periodic structures has attracted extensive attention, and mechanical metamaterials have the prohibition of elastic waves and vibrations. Propagation frequency band gap, so it can be used in mechanical engineering, civil engineering, aerospace and other fields of vibration isolation and noise reduction. [0003] Artificial periodic structural mechanics metamaterials have band gap properties, and the propagation of elastic waves in the band gap frequency range is effectively suppressed. When there are defects in the structure, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00F16F15/04
CPCF16F15/04H01Q15/0086
Inventor 王毅泽李冠华汪越胜
Owner TIANJIN UNIV
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