Adjustable piezoelectric phononic crystal plate based on acoustic black hole

A technology of phononic crystals and crystal plates, which is applied in the direction of sound-generating devices and instruments, can solve the problems of single defect state and dependence on structural design, etc., and achieve the effect of enhancing the noise reduction effect

Pending Publication Date: 2019-02-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

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Method used

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  • Adjustable piezoelectric phononic crystal plate based on acoustic black hole
  • Adjustable piezoelectric phononic crystal plate based on acoustic black hole
  • Adjustable piezoelectric phononic crystal plate based on acoustic black hole

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Embodiment 1

[0024] Such as Figure 9 , Figure 10 As shown, the present invention provides an adjustable piezoelectric phononic crystal plate based on an acoustic black hole. The crystal plate includes a metal substrate, a scatterer, and a soft substrate; wherein, the metal substrate is a rectangular outer frame. A soft substrate is arranged in the rectangular frame, holes are evenly distributed on the soft substrate, and the scatterers are placed in the holes, and piezoelectric sheets are arranged on the upper and lower surfaces of the scatterers.

[0025] Further, the scatterer is a metal cylinder, and the metal cylinder is made of steel.

[0026] Further, the metal frame is made of aluminum.

[0027] Further, the soft base is made of rubber.

[0028] As a preference, the crystal plate is rectangular, and the scatterer is an n*n scatterer matrix.

[0029] The present invention is based on the adjustable piezoelectric phonon crystal plate of the acoustic black hole, and uses the piez...

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Abstract

The invention designs an adjustable piezoelectric phononic crystal plate based on an acoustic black hole. A piezoelectric material is used to enable a scatterer in a phononic crystal to have a negative equivalent elastic modulus, so that a point defect is caused. The local position of wave is changed by changing the position of a piezoelectric plate, and the silencing effect is enhanced at the frequency of the original forbidden band. Compared with the original traditional defective phononic crystal plate, the adjustable piezoelectric phononic crystal plate has obvious flexibility, and the position of the acoustic black hole can be changed arbitrarily without changing the material structure of the phononic crystal.

Description

technical field [0001] The invention belongs to an acoustic black hole device for controlling wave propagation, specifically an adjustable piezoelectric phononic crystal plate based on an acoustic black hole, which acts on various acoustic filters to realize the function of adjustable channel filtering, and can also It is used in structural fault detection, and as a health monitoring system for various fields. Background technique [0002] Traditional defect state phononic crystals are divided into point defects and line defects. Point defect state phononic crystals have a significant impact on the local characteristics of phononic crystals. Studies have shown that elastic waves are localized at point defects, thereby realizing the characteristics of acoustic black holes. For the band gap of phononic crystals, if point defects appear in the anechoic frequency, the noise will be greatly reduced, which will have a profound impact in practical applications, such as figure 1 It...

Claims

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Application Information

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IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 邵瀚波陈岩何晋丞何欢谭霄陈腾飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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