Research On Mechanical And Acoustic Properties Of Z-reinforced Composite Sandwich Panels

By applying composite sandwich structures to the source of noise and the radiation ofstructure-borne sound, the noise performance of submarine can be improved. TheZ-reinforced composite sandwich panel is a kind of typical developed composite sandwich.Firstly based on the first shear deformation theory（FSDT）, the flexural mechanicaldifferential equations of common homogeneous composite sandwich panels were derived andsolved by the double trigonometric series method. Associated with the Mori-Tanaka methodbased on the Eshelby equivalent inclusion theory, effective elastic modulus of theZ-reinforced core was obtained, resulting in the solution of flexural mechanical equation ofthe Z-reinforced composite sandwich panels. Using these theories, the flexural mechanicalproperties of forward two types of composite sandwich panels were calculated and analyzed,and the theoretical result was of great agreement with those of the FE method.On the basis of the above static analysis, uniting the first shear deformation theory withthe Helmholtz-Huygens radiation integral formula, equations on vibration and sound radiationwas derived, and the submerged natural vibration, forced vibration and sound radiation werecalculated and analyzed, also the results of theoretical method and FEM/BEM methodshowed a good consistency.All the illustrations in this paper indicated that the FSDT，Mori-Tanaka method andHelmholtz-Huygens radiation integral formula previously adopted were workable methods tothe submerged vibro-acoustic properties of the common homogeneous composite sandwichpanels and Z-reinforced composite sandwich panels.Finally, based on the MATLAB GUI design environment, all codes were encapsulatedand a graphical interface was built.