The invention provides a multilayer sound insulation structure based on a sound wave bilateral adjustable mechanism and a design method of the multilayer sound insulation structure, and solves the problem that a porous material in a traditional sound insulation structure is low in low-frequency noise absorption efficiency, so that the large geometric dimension requirement is not matched with the limited geometric dimension of an aviation wall plate during low-frequency sound absorption of the uniform porous material. The multi-layer sound insulation structure is a multi-layer composite symmetrical sound insulation structure of a metal wall plate layer, a porous material sound absorption layer, an air layer, an acoustic metasurface structure layer, an air layer, a porous material sound absorption layer and a metal wall plate layer. The acoustic metasurface structure layer is used for regulating and controlling sound waves and comprises a plurality of acoustic units arranged in a two-dimensional array; the acoustic unit is an omega-shaped Helmholtz resonator, and a zigzag cavity with three open faces is formed in the sound wave inlet side. The two sides are different in resistance, simultaneous regulation and control of reflection and refraction of sound waves on the two sides can be achieved, and the number of propagation times of the sound waves between the metal wall plate layers is increased.
本发明提供了一种基于声波双边可调机制的多层隔声结构及其设计方法,解决由于传统隔声结构中多孔材料对低频噪声的吸收效率低,导致均匀多孔材料低频吸声时较大几何尺度需求与航空壁板有限几何尺寸不匹配的问题。该多层隔声结构为“金属壁板层‑多孔材料吸声层‑空气层‑声学超表面结构层‑空气层‑多孔材料吸声层‑金属壁板层”的多层复合对称隔声结构;声学超表面结构层用于调控声波,其包括多个二维阵列排布的声学单元;声学单元为Ω型亥姆霍兹共鸣器,声波入口侧设置有三面敞口的曲折空腔;两侧的抗特性不同,能够实现对两侧声波反射、折射的同时调控,增加声波在金属壁板层间的传播次数。
Multilayer sound insulation structure based on sound wave bilateral adjustable mechanism and design method thereof
一种基于声波双边可调机制的多层隔声结构及其设计方法
2024-07-16
Patent
Electronic Resource
Chinese
IPC: | G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES / B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / B64C AEROPLANES , Flugzeuge |
Acoustic metamaterial sound insulation mechanism and sound insulation cover thereof
European Patent Office | 2024
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