This paper describes the design, implementation and testing of crankshaft-mounted pendulum absorbers used for reducing vibrations in a variable displacement engine. The engine can run in V8 and V4 modes, and without absorbers it experiences significant vibration levels, especially in V4 idle. The absorbers are tuned to address the dominant second order vibrations, and are slightly overtuned to account for nonlinear effects. The absorbers were designed to replace the large counterweights at the ends of the crankshaft, and thus serve for both balancing and vibration absorption. The engine was placed in a vehicle and tested for vibration levels at idle under various load conditions, and these results were compared with results obtained from a similar vehicle without absorbers. The tests demonstrate that these absorbers offer an effective means of vibration attenuation in variable displacement engines.


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    Title :

    Vibration Reduction in a Variable Displacement Engine Using Pendulum Absorbers


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2003 Noise & Vibration Conference and Exhibition ; 2003



    Publication date :

    2003-05-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Vibration Reduction in a Variable Displacement Engine Using Pendulum Absorbers

    Nester, T. M. / Haddow, A. G. / Shaw, S. W. et al. | British Library Conference Proceedings | 2003


    Vibration reduction in a variable displacement engine using pendulum absorbers

    Nester,T.M. / Haddow,A.G. / Shaw,S.W. et al. | Automotive engineering | 2003