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Elastic membrane-type low-frequency sound insulation metamaterial structure

An elastic film and metamaterial technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of difficult to control cost, can not meet the requirements of low frequency, and space conditions are not allowed, and achieve the effect of simple design, easy processing and manufacturing

Inactive Publication Date: 2014-08-20
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0013] To sum up, for the low-frequency sound insulation problem in the frequency range below 500Hz, the existing sound insulation materials either cannot meet the low-frequency requirements; Allowed; either only effective for a single frequency or a narrow frequency band (such as Helmholtz resonators, etc.); therefore, it is necessary to provide a sound insulation material structure with a wide frequency band and meet the low frequency requirements

Method used

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  • Elastic membrane-type low-frequency sound insulation metamaterial structure
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  • Elastic membrane-type low-frequency sound insulation metamaterial structure

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] (1) Thin layer lightweight solution

[0038] In order to give scientific analysis data, some test pieces were designed and manufactured for research. The test piece is mainly composed of a 0.1-1mm silicone rubber film and a plastic or EVA (ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer) frame with a thickness of 1-2mm and a rib width of no more than 2mm. The density of the silicone rubber is about 1300kg / m 3 , the density of plastic is about 1180kg / m 3 , The density of EVA is equivalent to that of silicone rubber, and the density is generally low, which is a lightweight material. In addition, from the perspective of thickness, the thickness of the film is at the sub-mm level, and the thickness parameter of the plastic does not exceed 2mm, which belongs to the thin layer structure.

[0039] In addition, in order to achieve the lo...

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Abstract

The invention discloses an elastic membrane-type low-frequency sound insulation metamaterial structure which comprises two frames and a silicone rubber elastic membrane arranged between the two frames. A plurality of mass blocks are pasted on one side of the silicone rubber elastic membrane, and the mass blocks are separated with one another through the frames. The elastic membrane-type low-frequency sound insulation metamaterial structure solves the problems that a traditional sound insulation material is poor in low-frequency sound insulation performance, large in thickness, heavy in mass and the like and meets the five requirements of low-frequency sound insulation, wherein the five requirements include the low-frequency sound insulation requirement for noise below 500 Hz, the broadband requirement, the requirement for low structural thickness and low weight, and the requirement of easy design processing and low processing difficulty. The elastic membrane-type low-frequency sound insulation metamaterial structure has excellent low-frequency sound insulation performance, can effectively isolate low-frequency noise ranging from 200 Hz to 500 Hz, and can be applied to various carrying tools such as planes, automobiles, trains and ships and various types of building decoration. A brand new sound insulation solution is provided for creating low-noise working and living environments.

Description

【Technical field】 [0001] The invention belongs to the technical field of elastic thin-layer low-frequency light-weight sound-insulating materials, and in particular relates to an elastic-film-type low-frequency sound-insulating metamaterial structure. 【Background technique】 [0002] Existing sound insulation materials are generally hard materials, such as steel plates and the like. These sound insulation materials have good sound insulation in the high frequency band, but in the low frequency band below 500Hz, the sound insulation performance is very poor, and sometimes even the noise is amplified due to its own resonance. This severely restricts the design of vehicle sound insulation components and hall sound insulation materials, and poses a challenge to low-frequency sound insulation technology. In general, to isolate low-frequency sound waves, the thickness of the sound insulation components needs to match the wavelength of the sound waves. If you want to isolate sound ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
Inventor 吴九汇马富银张思文雷浩张炜权付刚
Owner XI AN JIAOTONG UNIV
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