Internally excited torsional steering wheel vibrations at frequencies near 8-22 Hz on smooth roads can produce driver disturbances, commonly described as “SHAKE”. These vibrations are primarily excited by the rotating front suspension corners and are periodic in the rotational frequencies of the tire-wheel assemblies. The combination of vehicular dynamic amplification originating in dominant suspension and steering system vibratory modes, and a sufficiently large 1st harmonic non-uniformity excitation of the rotating corner components, can result in periodic vibrations exceeding thresholds of disturbance. Controlling the periodic non-uniformity excitation through individual component requirements (e.g., wheel imbalance, tire force variation, wheel runout, concentric piloting of wheel on hub) is difficult since the desired upper limits of individual component requirements for vibration-free performance are typically beyond industry capability. Alternative approaches include de-sensitizing the vehicle, or the vehicle subsystems, at the critical frequency bands, which yield a lower overall vibration level for statistically relevant amplitudes of periodic excitation. One vehicle subsystem, the steering column assembly in a rack-mounted assisted steering system, may have a torsional dynamic response that can produce unwanted dynamic amplification. This condition significantly contributes to the overall sensitivity of the vehicle. Comparisons of ostensibly identical steering columns demonstrated substantial differences in dynamic amplification in both on-road and laboratory subsystem tests. The paper describes the on-road effects of these conditions at typical highway speeds, a laboratory test procedure for evaluation of the column contributions, and the source for the dynamic amplification within the column.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Small Amplitude Torsional Steering Column Dynamics on Smooth Roads: In-Vehicle Effects and Internal Sources


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2011 World Congress & Exhibition ; 2011



    Publication date :

    2011-04-12




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Small Amplitude Torsional Steering Column Dynamics on Smooth Roads: In-Vehicle Effects and Internal Sources

    Oblizajek, K.L. / Sopoci, J.D. / Society of Automotive Engineers | British Library Conference Proceedings | 2011


    Fundamental Dynamics of Steering Wheel Torsional Vibration on Smooth Roads

    Wong, Jason M. / Farhad, Max / Wu, Xuting | SAE Technical Papers | 2006


    Fundamental dynamics of steering wheel torsional vibration on smooth roads

    Wu,X. / Wong,J.M. / Farhad,M. et al. | Automotive engineering | 2006


    2006-01-0564 Fundamental Dynamics of Steering Wheel Torsional Vibration on Smooth Roads

    Wu, X. / Wong, J. M. / Farhad, M. et al. | British Library Conference Proceedings | 2006


    Steering column assembly, steering column and vehicle

    FU GUOQING / LIAO YINSHENG / HWANG TAE-SEOK | European Patent Office | 2022

    Free access