Abstract
Modern calculation methods enable the simulation of the sound power level measurement of complex industry sources applying the enveloping surface method. According to this procedure receiver points are created and distributed on spherical or cuboid surfaces following the relevant International Standards like ISO 3744 or ISO 3746 or on cylindrical or other regular surfaces depending on the requirements of any underlying machine specific standard. The sound pressure levels at these receivers on the enveloping surface and the resulting “effective” sound power level is calculated. The comparison of these sound power levels determined by simulation and the sound power levels of the sources in the model shows the influence of the geometric shape of the measuring surface. Such a simulation of the sound power determination with the enveloping surface method is applicable even in cases where a real measurement would not be possible, e. g. if the effective sound power level of a complete power plant or of a city with all its traffic sources shall be determined. The method and some practical examples are demonstrated.
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