Researchers have proposed various active suspension concepts to optimize the tradeoff between ride and handling in passenger vehicles. A few investigators suggested inclusion of the passenger jerk, the derivative of the passenger acceleration, as a measure of ride quality in the performance index. Minimization of a performance index then optimizes both the acceleration and jerk as well as other output representing handling quality and design constraints. This approach is caled jerk optimal control. This paper compares two different vehicle models of increasing complexity (the one and two DOF quarter car) using jerk optimal control. Different aspects of suspension performance are investigated, including the structure of the system transfer functions, the structure of the force control laws, and the tradeoffs between the various root mean square (rms) outputs defining system ride and handling performance. Tables compare the numrical results of the two models, allowing predictions of actual vehicle performance. The results of the two models show the same basic trend for the tradeoff between ride and handling quality: at a constant level of rms passenger acceleration the rms passenger jerk can be reduced significantly, but only at a cost of increased rms tire deflections. In physical terms, a softer ride results in degraded handling performance. For a chosen level of ride improvement, the more realistic two DOF quarter car model predicts more severe degradation of handling. The latter nevertheless predicts a substantial increase in vehicle ride quality is possible through a 55 % reduction jerk. It is expected that actual suspensions could also produce significant increases in ride quality through jerk reduction. Jerk optimal suspensions could find use both in higher end passenger vehicles and in transports for vibration sensitive cargo.


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    Title :

    A two DOF model for jerk optimal vehicle suspensions


    Additional title:

    Ein Zweifreiheitsgradmodell für optimale Federung von Fahrzeugen in Bezug auf ruckarme Fortbewegung


    Contributors:
    Rutledge, D.C. (author) / Hubbard, M. (author) / Hrovat, D. (author)

    Published in:

    Vehicle System Dynamics ; 25 , 2 ; 113-136


    Publication date :

    1996


    Size :

    24 Seiten, 10 Bilder, 2 Tabellen, 24 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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    RUTLEDGE, D.C. / HUBBARD, M. / HROVAT, D. | Taylor & Francis Verlag | 1996


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    Rutledge, D.C. | Online Contents | 1996


    A two degree of freedom model for jerk optimal vehicle suspensions

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