Influence d'une erreur de prévision des fréquences propres sur les résultats d'un calcul de rayonnement acoustique par méthode éléments de frontière

Abstract

One of the sources of inaccuracy of a structural acoustic radiation calculation with a boundary element method is the inaccuracy of the vibration data used as boundary limits. When vibration data come from a finite element method calculation, these inaccuracies can be made, in particular, on the structural eigenfrequencies prevision. In this note, we propose a first approach of the problem for this effect of eigenfrequencies inaccuracies on the acoustic field calculation.