Broadband sound insulation acoustic metamaterial structure based on acoustic black holes

Abstract

The invention discloses a broadband sound insulation acoustic metamaterial structure based on acoustic black holes. The whole broadband sound insulation acoustic metamaterial structure adopts a plate structure. A plurality of broadband sound insulation acoustic metamaterial structure unit unit cells are arranged on the plate structure, the broadband sound insulation acoustic metamaterial structure unit unit cells are regular hexagonal prisms, and the broadband sound insulation acoustic metamaterial structure unit unit cells are distributed in the plate in a matrix mode. The unit cell of the broadband sound insulation acoustic metamaterial structure can be divided into a hexagonal honeycomb inlet area, an acoustic black hole acoustic energy focusing area and an acoustic deceleration area. The broadband sound insulation acoustic metamaterial structure based on the acoustic black holes is provided by combining a thermal viscosity acoustic effect, an acoustic black hole effect and an acoustic metamaterial, sound insulation and noise reduction under a broadband are achieved, and particularly the sound insulation index under a low frequency band is improved, and the sound insulation stability under a full frequency band is improved.

Description

technical field [0001] The invention belongs to the technical field of noise control, and relates to a broadband sound-insulating acoustic metamaterial structure based on an acoustic black hole. Background technique [0002] In daily life, environmental noise has brought many adverse effects: affecting people's normal rest; affecting people's work efficiency; increasing the probability of people suffering from heart disease and cardiovascular disease; destroying the normal work of buildings and equipment, etc. Therefore, we need to control the noise and reduce the adverse effects of the noise on us. Depending on how noise is generated, propagated and received, we can suppress it at the source, control it in the path of the sound, or control it at the receiver. Among these three control methods, controlling noise in the acoustic propagation path is the most common technique. However, it is still difficult to control low-frequency noise at present. The main reason is that l...

AI Technical Summary

Problems solved by technology

[0005] However, acoustic metamaterials are still in the research stage, and there is still a lot of room for improvement.

On the one hand, the bandwidth of current acoustic metamaterials to control noise is small

On the other hand, the sound insulation of acoustic metamaterials to low-frequency noise needs to be further improved.

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