Abstract
A time-domain numerical model for studying the influence of close barriers on sound levels at a large distance from a source is proposed. It is a combination of a near-field simulation with a near-field to far-field transform based on the Helmholtz–Kirchhoff integral. The near-field simulation is based on a finite-difference time-domain type discretization of a well chosen volume around sources and near objects. The numerical accuracy of the model is studied theoretically and experimentally for a particular sound field. The simulation example is a large power station transformer surrounded by barriers. The evaluation of sound levels in the highly multimodal environment is not trivial. It is performed in small frequency bands around the frequency of the typical pure tones emitted by the source.
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