Preliminary simplified models for predicting sound propagation curves in factories
Mots-clés :
acoustic noise, acoustic wave propagation, factory noise levels, factory sound propagation curve, omnidirectional point source, sound pressure level, source sound power level, empirical prediction methods, octave-band sound propagation measurementsRésumé
Predictions of factory noise levels are based on predictions of the factory sound propagation curve-the variation with distance from an omnidirectional point source of the sound pressure level minus the source sound power level; SP(r)=Lp(r)-Lw. While more accurate approaches such as ray tracing exist, from a practical point of view there is considerable scope for developing simplified empirical prediction methods. In fact, several such models exist. However, these have short-comings which warrant the development of a new model. The approach taken was to predict the slope(s) and absolute level(s) of the sound propagation curve, approximated by one or more straight-line segments. With this in mind, octave-band sound propagation measurements were made in a number of empty and fitted factories. The curves were approximated by one or two straight-line segments. The intercepts and slopes of the segments were then determined. The development of preliminary simplified prediction models from the results is discussed
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