Objectives  Based on the engineering background of the baffle about structural performance is in consistent with acoustic performance design,

  Methods  the study on the underwater sound transmission properties of the composite sandwich plate was analyzed, and the calculation formula of the sound transmission performance of the sandwich structure was deduced based on the wave transmission theory in this paper. An example of calculating the sound transmission properties of composite sandwich plates showed that the method was consistent with the experimental results.

  Results  The results show that, the overall sound transmission coefficient varies periodically with the change of frequency, and the thickness will change the periodic change rule of the overall sound transmission performance; When the total thickness of the sandwich structure remains unchanged, changes in the proportion of each ply of the sandwich structure has little impact on the transmission coefficient; under the condition that the middle ply remains the same, the stacking sequence of the upper and lower plies does not affect the sound transmission properties.

  Conclusions  The above work has realized the calculation of the sound transmission of sandwich structures, and analyzed the influence of structural parameters on the sound transmission of sandwich structures, which has certain engineering significance for the design of sandwich structure.