NVH (Noise, Vibration, Harshness) refinement is one of the major aspects of automotive design alongside crashworthiness, occupant safety and durability. Considerable effort is invested in the refinement process which is a combination of predictive methods in the concept and detail design phases and experimental methods once prototype hardware becomes available. Market competition has lead vehicle manufacturers to strive to reduce and control the levels of interior noise and to avoid cabin noise 'booms' in the frequency range below 200 Hz. One way of approaching this issue is to refine the vehicle body design to achieve target levels of noise sensitivity so that the interior noise is controlled for a number of possible power-trains force inputs. Reduction of interior noise is often accomplished by a combination of trim design for acoustic absorbence and measures to identify the controlling aspects of the vehicle body structure with respect to interior noise and make various design changes accordingly. This paper discusses how the indirect boundary element method can be used to predict the noise sensitivity of a vehicle body and also how the controlling factors of the body structure might be identified and improved using panel contribution and modal participation analysis. The approach taken here is to use a modal model of the vehicle body coupled to a boundary element model of the cabin and boot airspace and to apply unit forces in the three translational degrees-of-freedom at the engine mounts and damper towers. Noise transfer functions are then predicted between the force input locations and the occupant car positions.


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    Title :

    The use of indirect coupled boundary element analysis in vehicle NVH refinement


    Contributors:


    Publication date :

    1998


    Size :

    15 Seiten, 7 Bilder, 7 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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