Detailseite
Projekt
Determination of the measurement and simulation uncertainty of room acoustic quantities
Antragsteller
Professor Dr. Michael Vorländer
Fachliche Zuordnung
Akustik
Förderung
Förderung von 2011 bis 2014
Projektkennung
Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 174776315
This research project continues the investigations of uncertainties in room acoustics in two new segments: room acoustic simulations and new acoustic predictors. With the detailed knowledge from the first phase about the uncertainties of measurements it is now possible to evaluate the development state of room acoustic simulation software. This research project investigates the origin and the amount of uncertainties in room acoustic simulations. The aim is to provide a conclusive answer on the performance of room acoustic simulation software, i.e. the correct prediction of the sound field with the uncertainties.The principles of GUM will again be applied as a framework to analyze and summarize the uncertainties in a systematic and standardized way. The uncertainty information is essential when comparing two room acoustic simulation results (i.e. two rooms with each other or one with and without acoustical treatment). The few available studies on simulation uncertainties assumed ideal sound fields and their validity for realistic sound field is questionable. In this study the sources of the fluctuations and the uncertainty due to the input variables are analyzed. The factors cover various scopes such as simulation parameters or spatial homogeneity of the material parameter. Stepwise the simulation conditions will be changed to a realistic sound field to allow a detailed description of the effects on the different resulting room acoustic parameters. Interdependencies of the different factors will be identified and modeled.In the first phase the circumstances that are responsible for large spatial fluctuations in the reverberation time destination were identified. The reverberation time is essential for further acoustical parameters like absorption measurements in the reverberation chamber, scattering coefficient or sound insulation index. The uncertainty of reverberation time will directly influence the uncertainty of these parameters. A new physically based calculation technique will be developed to improve the spatial variation of reverberation time, benefitting from the understanding of the problematic conditions.Further new room acoustic parameters concentrate to improve the prediction of the human perception. The perceptual model of subproject P7 and the loudness decay curves by Lee/Cabrera will be investigated in this project under two viewpoints. On the one hand the uncertainty of the final result will be investigated in same way like the ISO 3382 parameters were investigated in the first phase. Therefore the same GUM techniques and strategies can be applied and the old measurement data can be used. On the other hand the strategies of WP1 will be applied to the algorithms of the new predictors to get deeper understanding of the underlying coherences. This part will be in close cooperation with P7. Further questions such as how many measurements are needed to correctly classify an auditorium will be answered.
DFG-Verfahren
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