There is no doubt that vehicle noise influences the overall quality impression of a vehicle. Aside from obvious criteria (vehicle design), noise criteria can be used as well to dissociate one's own vehicle fleet from others. Therefore every automobile company strives to achieve their own special brand vehicle sound depending on vehicle class. This paper introduces a new sound design procedure for developing a brand interior sound. It will be demonstrated that the hybrid vehicle interior noise simulation VTNS is a very efficient tool for cleaning the interior noise from disturbing noise phenomena and subsequently designing the interior sound to a harmonic pleasant or very sporty sound. In this context, hybrid method means that measured as well as calculated noises are considered in the simulation tool. It will be explained how calculated noise sources like intake orifice are considered in VTNS to predict the influence on overall interior sound. The sound design method starts with a benchmarking and then proceeds with VTNS in a second step to define a realistic virtual target sound. To achieve the overall interior sound target in a demonstrator vehicle, the targets are broken down to single noise sources and transfer paths. This procedure is called 'Reverse Sound Target Setting'. Since the development work can be realized by the departments responsible for the respective component, this is a highly practical method. In the final stage, the demonstrator vehicle is set up, evaluated and compared with the virtual sound. as a simultaneous measured intake orifice noise. In the subsequent interior noise simulation the originally measured intake orifice noise is replaced by the synchronised CFD calculated orifice noise. This results in an audible interior noise, which shows the effect of the virtual design change. In the future further efforts will aim at modelling the P/T excitations analytically to substitute the modules which were initially empirically determined. Today the numerical calculation of the power train related excitation of low-frequency solid body vibrations and higher-frequency excitations of engine mount brackets modes is already state-of-the-art. Calculation of the power train vibrations by means of MBA and FEA models is performed today also. How these numerically based excitations can be used in interior noise simulation was explained earlier.


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    Title :

    Vehicle interior sound design procedure


    Additional title:

    Entwurfsverfahren für die Inneraumakustik von Fahrzeugen


    Contributors:
    Wolf, Klaus (author) / Alt, Norbert (author) / Eisele, Georg (author)


    Publication date :

    2004


    Size :

    8 Seiten, 6 Bilder, 5 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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