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In the present paper, the authors present a numerical analysis of the sound reduction provided by simple acoustic protective measures to attenuate the noise emitted by equipment placed near a facade. The noise source is assumed to be surrounded by an enclosed space, defined as a parallelepiped chamber with a rectangular opening. To perform the numerical analysis, a 3D Boundary Element formulation is implemented. This formulation makes use of the domain decomposition, together with Green’s functions, specifically defined to reduce the size of the involved system matrices and to allow consideration for surface absorption. Indeed, these Green’s functions, defined using the image-source technique, allow modelling of the building’s facade and the ground as infinite surfaces with a given absorption coefficient. The numerical model is verified against an analytical solution known for the case of a point load acting within a parallelepiped space; additionally, it is validated by comparing its results with those obtained experimentally for a simple case. The implemented model is then used to perform a number of numerical simulations, illustrating the effect of different configurations of the protective surfaces in the sound reduction.

3D Analysis of the Sound Reduction Provided by Protective Surfaces Around a Noise Source