A composite structure acoustic coating,which consists of silicon-rubber cells containing a cavity and embedded metal plates,is designed for use under semi-infinite water conditions at both the incident end and the radiation end of the acoustic wave.The finite element model of the coating is established by using simulation software,and the acoustic performances of the silicon-rubber unit with different distances to the domain boundary are obtained and compared.It is verified that the embedded metal plates can effectively improve the acoustic performance of the coating.The influence of different metal materials on the acoustic properties of the coating is studied,and the acoustic absorption mechanism is analyzed through the displacement cloud diagram of the coating.The study shows that this structure can achieve a stable sound absorption coefficient above 0.9 in the frequency band of 3 300-8 000 Hz.
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