This paper reports the results of an experimental investigation carried out on a 4-cylinder gasoline powered car, measuring the vibrations of the clutch system and interior noise. The vibration path was instrumented, from the flywheel to the clutch pedal. Experimental tests and a FEM model indicated possible solutions for noise and vibration reduction. From the spectral map of noise and those of vibrations it was observed that the range of frequency of the noise produced during clutch operation was coincident with a few distributed peaks in the transient response of the pedal, excited trough the Bowden cable. There can be different, more or less efficient solutions to prevent this vibration from entering the passenger compartment and the final decision shall depend on manufacturing and marketing considerations. Adding or subtracting mass to the transmission system causes a shift of resonance frequencies. On the other hand stiffness should not be altered so as to maintain the static stiffness of the transmission. With the finite element model the mass to be added or subtracted in order to eliminate the noise could be quantified. It is shown that as the added mass increases, the higher frequency resonance peaks shift to lower frequencies and their amplitude decreases. On the contrary low frequency peaks do not shift but their amplitude definitely increases. Therefore the added mass is a convenient means to reduce noise but it may introduce undesired vibrations in the steady state reponse of the pedal. In that case a dynamic damper can be used to dampen such steady vibration. Tests showed a satisfactory performance of this arrangement. A dynamic damper directly tuned at the noise frequency proved to be uneffective, probably because of transient characteristics of the phenomenon. Viscous damping or Coulomb friction could also be introduced along the transmission path. Coulomb friction modifies the static transmission characteristics and is not effective on resonance. Viscous dampers suitably located can suppress modes but present some manifacturing difficulties.


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    Titel :

    Experimental study of clutch system vibration and related noise


    Weitere Titelangaben:

    Experimentelle Untersuchung von Schwingungen bei Kupplungssystemen und dem damit verbundenen Lärm


    Beteiligte:
    Forte, P. (Autor:in) / Garavelli, D. (Autor:in) / Malara, N. (Autor:in) / Vitale, E. (Autor:in)


    Erscheinungsdatum :

    1995


    Format / Umfang :

    5 Seiten, 8 Bilder, 7 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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