嵌入局域共振单元宽频减振降噪蜂窝夹层结构研究进展

针对传统蜂窝夹层结构对中低、低频声波的作用效果较差的问题,近年来将传统蜂窝夹层结构与局域共振机理相结合,开发出了嵌入局域共振单元具有宽频减振降噪能力的新型蜂窝夹层结构。该结构在利用空气介质产生声热转换和粘滞耗散外,同时利用局域共振单元的共振吸声机理对低频声波进行衰减。同时,当在局域共振单元上引入微孔后,其在中、低频段声学性能进一步提高;该微孔薄膜与蜂窝芯密闭腔体将构成亥姆霍兹共振吸声器对低频声波进一步进行吸收。嵌入局域共振单元的蜂窝夹层结构具有优异的宽频声学性能,其在武器装备上具有广泛的应用前景。

Research Progress on Broadband Vibration and Noise Reduction Honeycomb Sandwich Structure Embedded with Local Resonance Unit

In view of the poor effect of traditional honeycomb sandwich structure on middle and low frequency sound waves, a new honeycomb sandwich structure with broadband vibration and noise reduction capability embedded with local resonance unit has been developed in recent years by combining traditional honeycomb sandwich structure with local resonance mechanism. This structure not only uses air medium to generate acoustic-thermal conversion and viscous dissipation, but also adopts the resonance sound absorption mechanism of local resonance unit to attenuate low-frequency sound waves. At the same time, when micro-holes are introduced into the local resonance unit, the acoustic performance of the structure in the middle and low-frequency bands is further improved. The closed cavity of the micro-hole film and honeycomb core will form Helmholtz resonance sound absorber to further absorb low-frequency sound waves. Honeycomb sandwich structure embedded with local resonance unit has excellent broadband acoustic performance, and a wide application prospect in weapons and equipment.