Techniques for using ray tracing for complicated spaces
Keywords:Acoustic noise, Acoustic waves, Noise abatement, Transfer functions, Acoustic room modelling, Acoustic treatment
AbstractDuring the last decade, the ray tracing method has contributed considerably to improve the prediction accuracy of acoustic room modelling. Ray tracing methods allow the analysis of complicated sound field for any room. However, the use of these methods and their validation are not always trivial. Even so, right and useful modelling is obtained only when each construction stage of the model is well done. The objective of this paper is to present, through a complicated example (a hydroelectric power station), some original techniques of modelling and validation. The identification of noise sources and the determination of their acoustic power, the representation of a non-single point source, the validation and some modelling techniques meant to reduce time computation will be presented. Furthermore, an efficient method for the evaluation of noise reduction provided by the various treatments will also be shown. This method, based on an evaluation of transfer functions between noise sources and different computation points in the room, can be used to choose the best acoustic treatment for a given noise reduction objective. All techniques presented in this paper have been applied and validated on an industrial case.
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