Transportation vehicle development cycles must be reduced due to competitive reasons which require a reduction in time and costs. In the past, and still today, development processes in acoustic engineering consist of measurements, analyses,modifications and verification on prototypes in several loops. This procedure is time- and cost consuming. On the other hand the acoustic comfort needs to be targeted and designed for each typical driving condition in order to satisfy customersrequirements. Validated numerical tools for vehicles acoustic design are still under development and will not be available to calculate each typical driving condition for several ten years. In the meantime "hybrid models" of acoustical behavior aspresented can be used. These models will be based on a combination of measured and calculated data. They allow the definition of sound quality targets and modification design. Simulation and listening of the binaural acoustic responses at vehicles arebased on the combination of known experimental data from previous vehicles and design modifications of components using experimental or numerical data basis.
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