New vehicle development has to meet increasing demands on the acoustic and vibrational performance (NVH-behaviour), that arise from environment, legislation and customer. Environmental demands aiming on the reduction of both, fuel consumption and exhaust emissions, force the effort to lightweight design and application of consumption-saving combustion engines. From the viewpoint of vehicle acoustics, there are two counterproductive factors, increased vibrational susceptibility of aggregates and body, and increased vibration excitation and noise radiation by modern high-torque Diesel engines. On the other hand, driving fun has become a serious factor in the customers decision to purchase. In this view, the drivetrain is one governing factor, in addition to vibration excitation by chassis and air-flow noise (at high speed). The main components of the drivetrain are combustion engine, clutch, transmission, axle shafts with joints as well as the wheels. This composition is the source of a multiplicity of characteristic NVH-phenomena. Vibrations transferred from the joint via side-shaft and wheel suspension into the body contribute to the loss of comfort causing noise phenomena as shuffle, boom and shudder. Axial and plunging force appearing in usual tripod or ball joints are measured with a special measuring device developed by the IKA, which is fit for both, test bench and road tests. Besides transfer behaviour, the eigenvibrations of the shaft-system are in the focus of investigations carried out at the IKA by means of operation deflection shape and experimental modal analyses. In a benchmark, a total number of 26 vehicles with both, systems of three and of two shafts, was investigated. In order to predict the effect of selective constructive measures on the eigenfrequencies, IKA set up a programme with ANSYS simulation tool verifying that the eigenfrequency was shifted significantly.


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    Title :

    Impact of side shafts on the interior noise of cars


    Additional title:

    Einfluss der Seitenwellen auf die Fahrzeuggeräusche im Inneren von Personenkraftwagen


    Contributors:


    Publication date :

    2004


    Size :

    10 Seiten, 16 Bilder, 3 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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