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databases can be found, in some cases it is necessary to make measurements (ISO 3740) for describing the source.

To calculate the noise propagation, it is necessary to create a model with points, lines and areas for the noise sources. The creation of a good acoustic model can be quite complicated.

Simulation tools are very useful specially at planning stages, where measurements are not possible. The consultant can evaluate the effectiveness for decisions in action plans, in order to minimize

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