A composite structural acoustic coating containing a cylindrical cavity,a tungsten plate and an aluminum frame was designed for use in semi-infinite waterside conditions at the incident end of the acoustic wave.A finite element model was established using simulation software,and the result of acoustic properties of the composite structure coating was compared with those of the cavity-only structural coating.Meanwhile the displacement variation characteristics and the cor-responding sound absorption mechanism of the two coatings were analyzed by means of displacement clouds of the two coat-ings.Afterwards the influence of geometrical parameters of the coating on its sound absorption performance was detected.The study shows that the composite acoustic coating has an absorption range of 8 568 Hz,namely has a wide bandwidth and high sound absorption ability if the absorption coefficient of 0.95 is taken as the standard.
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