P.H. Denke

The matrix difference equation (MDE) method is a computing system for vibration analysis of coupled structural-acoustic finite element models of spatially periodic structures, with applications to aircraft cabin interior noise prediction. The structural and acoustic elements are considered part of a single model, according to the traditional finite element approach, in which nodal displacements are unknowns, and the assembled stiffness and mass matrices are symmetric and banded. The spatially periodic assumption results in large savings in data preparation time and computing cost. The acoustic element is free of artificial constraints, and truly represents a fluid. The element is described in some detail, together with the transformation that eliminates the zero frequency modes resulting from the fluid properties of air. Some recent extensions of the method are presented, and a structural- acoustic model of an aircraft fuselage is described. An appendix clarifies the previously presented mathematical basis of the method.

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.396-402; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics, finite element method, aircraft cabin

Bibliothek

1992