Sensitivity of the radiated sound power to amplitude dependent damping

Using low shear resistant cores in metal plastic composites offers the possibility of an increased damping and therefrom improved acoustic properties of extensive metal sheet structures which are sensitive to vibrations.The damping of the single components in the composite shows an amplitude dependency. Established numerical material models in the finite element method do not consider any amplitude dependency. Therefore, the influence of the damping on the radiated sound power is evaluated numerically for monolithic rectangular steel plates and subsequently extended for the metal plastic composite. The results of the experimental characterization of the amplitude dependency for the components of the composite are described. Relevant parameter ranges are identified and their effect on the sound radiation is outlined.