夹芯复合结构是集承载和声隐身于一体的新型吸声结构形式,空腔谐振能够显著改善其低频段吸声性能。针对空气背衬条件下水中夹芯复合空腔结构,采用有限元计算方法,对比分析了芯材材料参数、空腔几何参数、水层厚度等对谐振峰值、峰值频率、吸声带宽的影响规律,为样机声学设计和模型试验提供了输入。结果表明:芯材模量越小,泊松比越大,密度越大,空腔间距越小,直径或体积越大,距迎声面越远,谐振吸声峰值频率向低频移动,带宽越窄。 The sandwich composite structure is a new type of sound absorption structure which integrates bearing and sound stealth. The cavity resonance can significantly improve its low-frequency sound absorption performance. Aiming at the structure of sandwich composite cavity in water under air backfill, the influence law of resonant peak value, peak frequency and absorption bandwidth of core material parameters, cavity geometry parameters and water layer thickness were analyzed by finite element method , Providing input for prototype acoustical design and model testing. The results show that the smaller the core modulus, the larger the Poisson’s ratio, the greater the density, the smaller the cavity spacing, the larger the diameter or volume, the farther away from the sounding surface, the resonant absorption peak frequency shifts to lower frequencies, narrow.