Fabricated acoustic metamaterial and acoustic baffle

Abstract

An assembly type acoustic metamaterial comprises a membrane type acoustic metamaterial and an assembly part, the membrane type acoustic metamaterial comprises one or more membrane type acoustic metamaterial units, and the assembly part is arranged on the membrane type acoustic metamaterial and used for achieving assembly connection between the multiple assembly type acoustic metastructures and/or between the assembly type acoustic metastructures and a supporting structure so that an assembly type acoustic metastructure layer can be formed through assembly connection. An acoustic baffle comprises an acoustic metamaterial layer, the acoustic metamaterial layer comprises a plurality of the assembly type acoustic metamaterial bodies, and the assembly type acoustic metamaterial bodies are assembled and connected together through the assembly parts. The performance of a large-size sound insulation board constructed based on the assembly type acoustic metamaterial tends to the performance of a small-size assembly type acoustic metamaterial in a designed frequency band, and the sound insulation effect of a designed target frequency band, especially a low frequency band, is improved.

Description

Technical field[0001]The present invention relates to an acoustic super material, and more particularly to an assembled acoustic supercoform and a sound barrier plate.Background technique[0002]The membrane type acoustic super material is usually composed of a tension or no tensioned film / sheet with a porous frame. The film / sheet may be a homogeny film / plate or a composite film / plate. The frame is a whole, consisting of various shape frame units such as hexagonal or quadrilateral, and the frame unit provides a fixed boundary for the membrane unit, and its acoustic performance depends on the resonance behavior of the film having or without mass block. Such as: Solidifying the film into the honeycomb board (the film unit size is 3.65 mm, the envelope size of the sample is 10 cm). This improvement can achieve noise regulation by manual design for a particular frequency sound, which is achieved without too much weight (low material density) and space (small thickness), which can ...

AI Technical Summary

Problems solved by technology

However, if a large-scale membrane-type acoustic metamaterial (such as an envelope size greater than 10 cm) is made in this way, its performance will be affected by the overall dynamic response and its performance will be reduced, especially the low-frequency sound insulation effect will decrease as the size increases. more obvious

This phenomenon will also appear in other large-scale plate structures based on membrane-type acoustic metamaterials, that is, the sound insulation performance of large-scale membrane-type acoustic metamaterials, especially the low-frequency sound insulation performance, will be greater than that of small-size samples. drop in magnitude

[0003] Since the existing large-scale membrane-type acoustic metamaterials rely on fixed connections to make multiple acoustic metamaterial units solidly connected together, when vibrating, the large-scale sample composed of multiple fixed acoustic metamaterials will appear at certain frequencies. Considering the overall vibration situation, its first-order frequency is often lower than the frequency of independent vibration of the acoustic metamaterial unit, thereby reducing the sound insulation effect in this frequency range

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