J.-P. Coyette

Modelling acoustic radiation from vibrating structures usually requires to handle the wave equation in an unbounded (infinite) fluid domain. This difficulty can be removed by refering to boundary integral formulations which reduce the dimensionality of the problem. Various boundary element techniques are currently available to solve this kind of problem. The paper concentrates on the validation of an alternative formulation based on the finite element method. Acoustic finite elements are selected for modelling the near field (close to the vibrating surface) while infinite elements with appropriate interpolation functions are used for the far field. A special weighting scheme (the "wave envelope" approach) is selected for these elements in order to simplify and to speed up the generation of related stiffness, damping and mass matrices. This fonnulation is reviewed here and some applications to elasto-acoustic radiation and scattering are presented. Comparisons with solutions obtained from boundary element models are also provided and show the capabilities of related computational procedures. Future research needs are outlined.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 7 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.421-427; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1992