Coupling geometrical and integral methods for indoor and outdoor sound propagation - Validation examples

The study of the acoustic behaviour of volumes in the presence of vibrating surfaces can be done at medium and high frequencies by using a generalised Green function. This function is defined for an associated acoustic proble m and is obtained by using geometrical approaches. This method called GRIM (Green Ray Integral Method) can he applied to the decoupling of connected a coustic volumes. Applications to building acoustics, to the car industry or to outdoor sound propagation problems, such as the assessment of complex n oise barriers with complex environments, are also presented. Last, the stud y of outdoor sound propagation can be related to indoor noise prediction.