It is well known that estate cars (in the US called ''station wagon'') tend to be sensitive to low-frequency vibration input caused by the stochastic macrostructure of the road surface. This may result in a strong low-frequency acoustic excitation within the passenger cabin which is subjectively felt to be uncomfortable. As a feasibility study an ANC system has been installed into an experimental car. The aim was to show the potential for a reduction of the unpleasant noise. To begin, an investigation of the vibrational behavior of the chassis was performed. Within the critical frequency range there were only a few dominant principal components that could be extracted. As primary sensors for a feedforward ANC system accelerometers have been mounted at positions on the axles, giving ANC system which feeds loudspeakers as secondary sources for cancellation in the cabin. Adaption is maintained by error microphones installed into the headliner of the cabin. The resultant reduction of the road noise provides a considerable enhancement in the noise comfort of the estate car.


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    Title :

    Adaptive road noise cancellation for a midclass estate car


    Additional title:

    Adaptive Fahrgeräuschaufhebung für einen Mittelklasse-Kombiwagen


    Contributors:
    Letens, U. (author) / Koners, G. (author) / Saunders, T.J. (author)


    Publication date :

    1999


    Size :

    4 Seiten, 4 Bilder, 5 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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