The present work is aimed at the development of a numerical procedure, based on the usage of the BoundaryElement Method (BEM) as implemented in the software LMS Virtual.Lab, for the vibro-acoustics analysis of an exhaustmanifold. The manifold vibrations are induced by two different ways: engine vibrations (transmitted to the manifoldsurfaces) and turbulences generated by the air flow in the exhaust system. The indirect BEM (IBEM), with a variationalsolution algorithm, is adopted to assess the exhaust manifold acoustic radiation. The modal analysis of the acoustic cavityis realized by the Finite Element Method (FEM) and the corresponding eigenfrequencies compared with those obtained byan IBEM forced response analysis and by experimental measurement. Experimental acoustic pressures at the manifoldinlet and outlet are measured in anechoic room in order to compare with corresponding numerical predictions and assessthe accuracy level obtained.
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