VIBROACOUSTIC BEHAVIOR OF AN ELASTIC BOX USING STATE-OF-THE-ART FEM-BEM APPROACHES

State-of-the-art methods for the study of the vibroacoustic response o f a rectangular box are presented. Fast and accurate approaches are us ed for structural modeling, cavity coupling, and acoustic radiation mo deling. A free interface component mode synthesis is used for the moda l analysis of the box. The structural modes are then coupled to the ca vity modes using a modal superposition technique. For radiation from t he box, an indirect variational formulation is developed in terms of s urface integral equations, A special integration scheme is used to han dle singularities of the Green's function, In order to reduce signific antly the computation time of the regular integrals, a new method base d on expansion of the Green's function and its normal derivative in te rms of spherical Bessel functions is used, The techniques presented ar e validated and the results for a typical box problem are presented. ( C) 1998 Institute of Noise Control Engineering.