Abstract
The noise reduction in aircrafts is one of the top priorities for the aerospace industry. In this paper, a thorough investigation is done on the reliability of numerical FEM/BEM methods to predict the sound transmission loss of aircraft-type panels. The investigation is based on the comparison between numerical predictions, using commercial and in-house software, and measurements for different configurations of panels: single plate, double plate with air cavity, and double plate with cavity absorption. Clamped boundary conditions are used for both the simulation and experiments. The porous material is modeled following Biot theory and the diffuse sound field is simulated as a superposition of plane waves at various directions. For the experimental part, the transmission loss is obtained by setting the panel between a reverberant and an anechoic room. The transmitted power is measured with an intensity probe allowing fine characterization of the effects of complexities such as the boundary conditions and leaks. Furthermore, the quadratic velocity is measured as a means of validation for the mode shapes. Discussions on the numerical procedure to follow for providing reliable transmission loss predictions and a discussion on the discrepancies between the experiments and the numerical simulations will be done.
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