NON RESONANT CONTRIBUTIONS IN MODAL ENERGY METHODS

Nicolas Totaro (1) , Laurent Maxit (1)

1 LVA - Laboratoire Vibrations Acoustique

In many cases, the non resonant contributions of the vibro-acoustic systems is not negligible. In Statistical Energy Analysis (SEA), this contribution is often taken into account introducing indirect coupling between subsystems. In modal energy methods like Statistical modal Energy distribution Analysis (SmEdA), only resonant modes could be taken into account. Recent developments of modal energy methods allow now to overcome the problem of nonresonant contribution. Two complementary approaches have been developed. The first one, in the framework of SmEdA, is based on the definition of indirect coupling between modes of two nondirectly coupled subsystems. The second one considers modal energy exchanges at pure tone and defines a pure tone modal coupling loss factor between all modes of subsystems. These two new approaches will be validated and compared in a cavity/structure/cavity test case.

Domaines: Vibrations [physics.class-ph]; Vibrations [physics.class-ph]

Nicolas Totaro, Laurent Maxit. NON RESONANT CONTRIBUTIONS IN MODAL ENERGY METHODS. MEDYNA, Apr 2013, Marrakech, Morocco. ⟨hal-00841464⟩