Sensitivities in the acoustic modeling of damping materials for automobile applications.
* Presenting author
The product design in a virtual phase gains importance as the acoustic requirements become stricter and the development cycles are shortened. Reliable statements at an early stage are only possible when the performance of the different components is described with sufficient mathematical accuracy. Special attention must be paid to the modeling of acoustic treatments containing poroelastic materials, since these media show complex, high-dissipative properties. To evaluate the quality of the available finite element models this paper examines the sound transmission through different spring-mass systems under airborne noise excitation, with a particular focus on the behavior of the poroelastic layers. After the introduction of the selected test setup, several variables that may influence the modeling are examined, including the material formulation, uncertainties in the input parameters as well as the impact of the coupling and boundary conditions. The different configurations are evaluated by comparing their results with experimental. Finally, conclusions on the sensitivities of the models and recommendations on their practical application are given.