In a context of vehicle mass reduction, glazing design is a major issue of the NVH (noise vibration harshness) design. Therefore, a specific hybrid method was developed to evaluate the glazing contribution to the noise at passenger's ears. The noise transmission through the glazing is fully modeled, while other transmission paths are measured. Transmission paths through glazing include sound transmission losses and internal car compartment propagation. External acoustic loads are measured for the powertrain and external diffuse excitation. The cavity is modeled using a ray-tracing software and data available from existing database. Glazing TL (sound transmission loss) are available from the supplier for a wide range of thickness and interlayer. The method was compared to experiments in the case of an existing car, for the two load cases. Glazing changes allow checking the method relevance and the sensitivity of the interior noise to the glazing performance. Moreover, since internal cavity transfer function could be measured the ray-tracing computation was also checked in a project context i.e. using pre-existing data. At last, using a masking technique, comparison of computed TL and in-situ TL was possible. Such a method is well fitted for. In this paper, a method allowing the evaluation of changes of only few components has been presented. (1) It is a synthesis method based on the separate treatment of sound transmission paths through glazings (computed) and all other paths (measured). (2) For the transmission path through one given glazing, the effect of the glazing itself (its TL) is separated from the effect of the passenger compartment (transfer function). The modeling of the latter is attempted via ray tracing calculations and measurements with discrepancies; both contain errors and give no guarantee of success for the synthesis. (3) The adopted procedure to overcome these difficulties is to use TL calculated by the supplier, with surface and TL as only parameters, and to identify the transfer functions which provide an effective synthesis. The case presented concerns glazings, but other parts of the vehicle could exploit the method as well (dashboard, roof). It fits well with vehicle's evolution changes during series productions, or for a new vehicle developed on an existing platform. In this work, numerical results aimed mainly at confirming measurements. Now that we are confident in the method, we could cover measurement times reducing laboratory occupation. More scenarios could be assessed in shorter time at early stage of the project.


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    Title :

    Glazing NVH design against powertrain noise and exterior insulation


    Contributors:


    Publication date :

    2011


    Size :

    13 Seiten, 8 Bilder


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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