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Low frequency broad-band gap 3D phonon crystal for vibration damping noise reduction

A phononic crystal, vibration reduction and noise reduction technology, applied in the direction of sound-emitting devices, instruments, etc., can solve the problems of large mass, complicated preparation, and difficulty in obtaining sufficient low-frequency wide bandgap, etc., to achieve weight reduction, simple preparation, and reduced size Effect

Active Publication Date: 2018-12-18
南京光声超构材料研究院有限公司
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Problems solved by technology

[0005] In order to overcome the technical problems of large mass, complex preparation and difficulty in obtaining sufficient low-frequency wide bandgap in the existing structure, the present invention provides a method of using vibration mode separation to open the low-frequency band gapped phononic crystal

Method used

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  • Low frequency broad-band gap 3D phonon crystal for vibration damping noise reduction
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  • Low frequency broad-band gap 3D phonon crystal for vibration damping noise reduction

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Embodiment Construction

[0018] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings, and the substantive features and remarkable progress of the present invention will be clarified.

[0019] figure 1 (a) is the basic two-dimensional chiral structure in the unit cell model of the phononic crystal structure, including a disc 1 and four connecting rods 2 . Such as figure 1 As shown in (b), the axis of the connecting rod 2 is perpendicular to the axis of the disc 1, and the outer surface of one end of the connecting rod 2 is tangent to the side of the disc 1, and the four connecting rods 2 are distributed rotationally symmetrically around the disc 1 on the side of the disc structure. The disc 1 and the four connecting rods 2 are made of the same material, which is specifically determined by the acoustic characteristics and the requirements of the manufacturing process.

[0020] Six of the above-mentioned identical two-dimensional chiral...

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Abstract

The invention discloses a low frequency broad-band gap 3D phonon crystal for vibration damping noise reduction; the phonon crystal comprises a plurality of primitive cells that are periodically arranged; the primitive cell comprises 6 same 2D chiral structures; the chiral structure comprises a disc and four connecting rods; the axis of the connecting rod is orthogonal to that of the disc; one endof the connecting rod is connected with the disc periphery; the 4 connecting rods encloses the disc and are symmetrically arranged in a rotary mode; the 6 2D chiral structures are connected via the connecting rod end portions so as to form a hexahedron; the rotary directions of the chiral structures on two mutually parallel surfaces are opposite to each other; two adjacent chiral structures are mutually vertical to each other. The phonon crystal not only has a low frequency broad-band gap property energy zone structure, and is simple in preparation, thus reducing the structure complexity, improving the structure vibration damping stability, and providing a new path for the vibration damping noise reduction.

Description

technical field [0001] The invention belongs to the field of acoustic functional materials for noise absorption and vibration control, and specifically relates to a three-dimensional phononic crystal that uses vibration mode separation to generate a low frequency wide band gap. Background technique [0002] At present, with the development of modern industry, the noise and vibration problems in the environment of human life have become increasingly prominent. On the one hand, how to achieve vibration reduction and noise reduction of electromechanical equipment and ensure the safe and long-life operation of electromechanical equipment is an urgent problem to be solved; on the other hand, the vibration problems caused by the operation of large mechanical equipment will not only affect the living Irreversible damage to buildings will have an impact on human health. How to find an effective way to suppress vibration and reduce noise has become an important issue at present. Ho...

Claims

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Application Information

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IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 卢明辉秦苑颜学俊田源费翔陈延峰
Owner 南京光声超构材料研究院有限公司
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