Light low-frequency wideband film metamaterial sound isolator

Abstract

The invention provides a light low-frequency wideband film metamaterial sound isolator. The light low-frequency wideband film metamaterial sound isolator is composed of a grid support, adhesive elastic films and balancing weights, wherein the grid support is made of rigid light materials and formed by square grids periodically extending in the x direction and y direction, the adhesive elastic films are bonded with the grid support in tensing mode, the balancing weights correspond to the square grids respectively and are periodically and additionally arranged on the adhesive elastic films, and each square grid, the corresponding adhesive elastic film and the corresponding balancing weight form a cellular which is a smallest acoustic metamaterial unit, used for isolating low-frequency noise, in the sound isolator. The light low-frequency wideband film metamaterial sound isolator is formed by periodically arranging the acoustic metamaterial units, and achieves coverage of a wideband, namely a wide frequency range through the balancing weights, of different weights, arranged in the adjacent cellulars. When the metamaterial units are stimulated by acoustic waves, the balancing weights and the tensioned adhesive elastic films generate a local resonance phenomenon, the average displacement of each whole cellular is zero, and sound is isolated efficiently.

Description

technical field [0001] The invention relates to low-frequency noise blocking technology, in particular to a light-weight low-frequency broadband thin film metamaterial sound insulation device. Background technique [0002] Since the 1950s, with the rapid development of aerospace, high-speed trains, power transmission and transformation projects, etc., noise problems have become increasingly serious and have attracted widespread attention. In the field of life, noise interferes with people's normal work and life, and long-term exposure to high-noise environments will cause harm to people's health. In the field of production, strong noise will cause the failure or even damage of equipment, resulting in accidents. In the military field, with the development of various weapons and equipment to extreme operating environments such as high-speed, light-weight, large-scale, and heavy-duty, the noise problem caused by it has become more prominent, which has seriously affected the co...

AI Technical Summary

Problems solved by technology

The sound insulation of traditional sound insulation materials in the low frequency range is controlled by the law of mass density, and it is difficult to achieve low frequency broadband sound insulation with lightweight materials

Studies have shown that there are common problems with prominent low-frequency noise in aerospace, high-speed trains, power transmission and transformation engineering and other fields

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