Abstract
It is of great significance to study the low frequency acoustic absorption characteristics of acoustic cover for improving the acoustic stealth performance of submarine. Considering the sound absorption performance of cavity coating and local resonant thin film structure, a finite element model of cavity acoustic coating with local resonance is established. The sound absorption characteristics of the composite structure in the range of 10-1000Hz are studied. The influence law of the sound absorption performance was obtained by adjusting the geometric parameters of the composite structure. The results show that : (1) The coupling between the local resonant structure and the cavity coating can produce a sound absorption peak, and the sound absorption coefficient can be increased by 30% at most; (2) The first sound absorption peak produced by the composite structure is mainly related to the cavity overburden; (3) The second sound absorption peak is mainly generated by the coupling between the cavity coating and the local resonance structure. The results can provide a theoretical basis for the design and application of acoustic coating.
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