Elastic membrane-type low-frequency sound insulation metamaterial structure

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 ...

AI Technical Summary

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

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