The virtual development process of automotive audio systems in a multidisciplinary simulation environment has been shown within the context of this paper. Realistic upfront simulations by means of a fully coupled multiphysical electrical-mechanical-acoustical simulation model have been demonstrated. The proposed model uses matrix methods for the mechanical domain (finite elements) and the acoustical domain (boundary elements and wave based finite difference schemes), and additionally geometrical acoustics concepts (ray and cone tracing), as well as a lumped parameter model for voice coil electromagnetics. This model covers the loudspeaker, enclosure and the car cabin. In subsequent steps the multiphysical simulation model has been connected to a virtual model of the tuning process (which optimizes the sound quality by means of advanced signal processing technologies and psychoacoustical paradigms for the perception of sound by humans). This extends the author's multiphysical model to a multidisciplinary model. This highly complex simulation model enables the author to calculate the binaural room impulse response long before a single piece of hardware exists. Thus he is able to listen to a virtual automotive audio system by means of a binaural playback system that uses head-tracked headphones. These auralizations can be used to rate the sound quality of the audio system (via the use of subjective evaluation methodologies) in an early design stage and opens the door for upfront virtual product optimizations. However, it must be noted here, that currently this methodology is only used for simulating the small signal behaviour of an automotive audio system. While in principle the approach described here can be extended to the large signal behaviour (including nonlinearities), a lot of more research has to be done. Currently work is going on to extend the current model to the large signal domain. One final aspect which has to be addressed here as well are diverse uncertainties in the simulation models. Most of the uncertainties can be found in the mechanical domain. Of capital importance are the mechanical material properties of the vibration system of the loudspeaker and the car's trim panels. It is vital to use appropriate methodologies for retrieving those material parameters from measurements to optimize the accuracy of simulation models.
Virtual product development of automotive audio systems in a multidisciplinary simulation environment
2011
12 Seiten, 8 Bilder, 8 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
Audiosystem , Audiotechnik , Autoausrüstung , digitale Signalverarbeitung , Fahrzeuginnenraum , Frequenzabstimmung , Impulsantwort , Kleinsignalverhalten , Kopfhörer , Lautsprecher , Produktentwicklung , Produktoptimierung , Qualitätsverbesserung , Raumakustik , Simulationsmodell , Simulationssystem , Tonwiedergabetechnik , virtuelle Produktentstehung
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