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Phonon function material structure containing non-convex type section holes and making method thereof

A technology of functional materials and production methods, applied in the direction of sound-generating devices, instruments, etc., can solve the problems that cannot meet the requirements of acoustic characteristics, and achieve the effect of simple processing and wide acoustic band gap

Inactive Publication Date: 2011-08-31
BEIJING JIAOTONG UNIV
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  • 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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  • Phonon function material structure containing non-convex type section holes and making method thereof
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  • Phonon function material structure containing non-convex type section holes and making method thereof

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Embodiment 1

[0029] 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:

[0030] Step 1: Preliminary design of the relative size of the non-convex cross-section hole: the schematic diagram of the hole cross-section is as follows figure 2 As shown, record the non-convex cross-section hole section size as b, c and d, and determine the maximum value of c / a according to the requirements of structural strength; to obtain a wider acoustic band gap, the hole section size should satisfy b / a=c / a-0.3, this is a necessary condition for the structure to obtain the widest acoustic bandgap; to obtain the widest acoustical bandgap, the rectangle (ie figure 2 The distance between four small rectangles with a length of (c-b) / 2 and a width of d), but the rectangles should be prevented from touching each other during vibration. Assuming that the strain of the material does not ...

Embodiment 2

[0037] Hole section diagram as figure 2 As shown, according to the required porosity and structural strength, determine the relative size of non-convex section holes; image 3 The determination of the lattice constant in the medium should meet the requirements of the structural acoustic properties; drill holes in a given matrix, adjust the symmetry of the structure, and form such Figure 4A new type of phononic functional material structure containing non-convex cross-sectional holes is shown, wherein the non-convex cross-sectional holes are arranged in a close-packed form in the structural period direction; image 3 for Figure 4 The schematic diagram of the original cell.

[0038] Assume that the required porosity of the structure is The requirement for structural strength is c / a≤0.7; from step 1, b / a=0.4, d / a=0.398, and at this time Therefore, the relative size of the hole section should be determined according to step 2; that is, the simultaneous equation 0.7 2 +...

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Abstract

The invention discloses a phonon function material structure containing non-convex type section holes and a making method thereof. The phonon function material structure comprises non-convex type section holes arranged periodically and is characterized in that the non-convex type section holes are formed by bulging one rectangle from the surrounding of the center of each edge of a square hole to the center of the square hole, and all edges are not mutually crossed; relative size of a non-convex section is calculated according to the requirements for structural strength and porosity (less than 50 percent); proper lattice constants are determined according to the requirement for structure acoustic characteristics; and on the basis, holes are punched in a required matrix material, symmetry of the non-convex section holes is regulated to ensure that the non-convex section holes are densely distributed in the structural cycle direction, therefore, the purpose of obtaining the phonon function material structure with a widest acoustic band gap is achieved. The invention has the advantages that the widest acoustic band gap is obtained while the requirements for the structural strength and the acoustic characteristics are met, and the phonon function material structure only comprises the non-convex section holes distributed periodically and is simple in process.

Description

technical field [0001] The invention relates to a phonon functional material structure with non-convex section holes and a manufacturing method, which belongs to acoustics and relates to the fields of machinery, condensed matter physics, mechanics, material 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 has beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/165
Inventor 汪越胜王艳锋
Owner BEIJING JIAOTONG UNIV
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