The modeling of interior noise requires the application of so called hybrid methods. One reason for the application of hybrid methods is that in the mid frequency regime some components of the aircraft must be modeled by discrete methods like the finite element method (FEM) others can be modeled by the statistical energy analysis (SEA). One typical application of the hybrid method is the noise transmission through aircraft panels. Here the general approach would be to model the stiff panel with deterministic methods whereas the two cavities for radiation and irradiation are modeled by statistical subsystems. The hybrid method developed by EADS-IW is based on a wavenumber space approach, whereas a commercial application in VAOne is based on real space coordinates. This paper deals with the comparison of both methods in terms of precision and computational expense. Two kind of excitation will be investigated: diffuse field and turbulent boundary layer excitation. The latter requires the determination of the joint acceptance function. Within this paper two test cases will be dealt with. The first consists of a curved plate of 3mm aluminum with a radius of 2 m. The second shows a typical rib stiffened design that is normally used for the construction of fuselages. The aim of the first test case is to clarify the main ideas and to make comparison to SEA simulations possible. The latter case is for presenting a more practical application, a large curved fuselage carbon fiber reinforced plastic (CFRP) panel.
Comparison of hybrid modeling tools for interior noise prediction
2009
8 Seiten, 5 Bilder, 6 Quellen
Conference paper
English
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