The demand for comfort level in luxury passenger vehicles is steadily increasing. Hence several performance attributes and parameters are needed to be fine-tuned to fulfill the challenging expectations for these outstanding vehicles. The NVH refinement is linked to many components and subsystems and therefore allows for many different combinations. This paper presents an approach to identify and reduce the high level whistling noise that was perceived in the passenger compartment while the vehicle was accelerated above 50 Kmph. Interior noise measurements in Static Engine run-up condition reveals that the whistling noise is of specific order. Since, Whistling noise is related to aerodynamic behavior of components, Engine Cooling fan, Turbo charger, Alternators and Compressors were suspected. Using Order tracking and near field measurements, HVAC alternator was confirmed as the main cause for whistling noise. Noise reduction trials confirmed that Orders related to alternator cooling fan became dominant above 50 Kmph. HVAC Alternator was tuned in a manner to reduce the noise without affecting the electrical performance. With this modification significant reduction in whistling noise level was observed in both objective and subjective assessments in the passenger compartment.


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    Title :

    Identification and reduction of whistling noise in passenger vehicle




    Publication date :

    2013


    Size :

    9 Seiten, Bilder, Tabellen, 3 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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