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Non-convex section hole-containing phononic functional material structure and manufacturing method thereof

A technology of functional materials and production methods, applied in the fields of mechanics and materials science, machinery, and acoustics, can solve the problems of incapable acoustic characteristics, and achieve the effect of simple processing and wide acoustic band gap.

Inactive Publication Date: 2011-03-23
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing structure cannot meet the requirements of acoustic characteristics under a given porosity, the purpose of the present invention is to provide a new type of phonon functional material structure with non-convex cross-sectional holes and its manufacturing method

Method used

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  • Non-convex section hole-containing phononic functional material structure and manufacturing method thereof
  • Non-convex section hole-containing phononic functional material structure and manufacturing method thereof
  • Non-convex section hole-containing phononic functional material structure and manufacturing method thereof

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Embodiment 1

[0032] A method for manufacturing a novel phonon functional material structure containing non-convex cross-sectional holes is characterized in that it further includes the following steps:

[0033] Step 1; Determination of the lattice constant: In the band structure diagram of the phonon functional material, the abscissa is the wave vector, and the ordinate is the frequency; usually the frequency corresponding to the wave whose wavelength is equal to the lattice constant in the matrix is ​​used (c t / a,c t is the shear wave velocity in the matrix, a is image 3 The lattice constants of the square-arranged phonon-functional materials are shown, namely Figure 4 The side length of the original cell of the phonon functional material shown) is used as a reference to simplify the specific value of the eigenfrequency (Hz) to obtain a dimensionless reduced frequency or reduced frequency (denoted as Ω), which makes the calculation results consistent with the specific The lattice con...

Embodiment 2

[0039] exist figure 1 In the process of determining the lattice constant of the structure, the requirements for the acoustic properties of the structure must be met; the schematic diagram of the hole section is shown in figure 2 As shown, according to the required porosity and the determined lattice constant, determine the relationship between the pore cross-sectional size, by adjusting the size of the pore cross-sectional size and the symmetry of the structure, such as image 3 The structure of the new phonon functional material with non-convex cross-section holes shown in the figure must satisfy that the holes are arranged in a close-packed form in the periodic direction of the structure, Figure 4 shown as image 3 The schematic diagram of the original cell.

[0040] exist Figure 5 , Figure 6 In the example shown, the porosity is 0.3675, the left picture shows a convex cross-section hole, and the right picture shows a non-convex cross-section hole. The abscissa in the...

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Abstract

The invention discloses a non-convex section hole-containing phononic functional material structure and a manufacturing method thereof. The phononic functional material structure with wider acoustic band gap is achieved by the following steps of: determining a proper lattice constant according to the requirements of acoustic characteristic of the structure; based on the determined lattice constant, calculating the size of the non-convex section according to porosity required by the structure; and adjusting the symmetry of the non-convex section holes to ensure that the holes are formed in a dense structure along the periodic direction of the structure. The phononic functional material structure consists of the non-convex section holes which are distributed periodically. The structure achieves the wider acoustic band gap by introducing the non-convex section holes under the condition of determining the porosity of the structure and designing the size and the symmetry of the holes. The structure has the advantages that: the structure achieves the wider acoustic band gap while meeting the requirements of the acoustic characteristic of the structure; and the structure only contains the non-convex section holes which are periodically distributed and is simple to machine.

Description

technical field [0001] The invention relates to a phonon functional material structure and a manufacturing method with non-convex cross-sectional holes, which belong to condensed matter physics and relate to the fields of machinery, acoustics, mechanics, materials science and the like. Background technique [0002] For high-precision instruments in service in aviation and aerospace, the requirements for machining accuracy and working accuracy are very high. On the one hand, it is necessary to provide a vibration-free processing environment within a certain frequency range for high-precision processing systems to ensure high processing accuracy requirements; on the other hand, it is necessary to provide a vibration-free working environment within a certain frequency range for special instruments or equipment to improve Working precision and reliability, while extending its working life. Therefore, how to obtain a vibration-free environment within a specific frequency range h...

Claims

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Application Information

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IPC IPC(8): G10K11/16
Inventor 汪越胜王艳锋
Owner BEIJING JIAOTONG UNIV
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