Abstract
A boundary element program for the study of 2D acoustical problems is presented. It uses a variational approach leading to symmetric matrices after discretization. Numerical optimization enables the study of complex situations, such as screens placed near trains, for the full frequency range of interest, at reasonable cost. The ground effect is included in the Green function. Post-treatments offer means of introducing point or incoherent line sources. Several applications to the cases of screens placed near trains are given.
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