This paper describes the potential reduction of the cab floor acceleration by the application of a semi-actve cab suspension system in order to enhance the comfort on agricultural tractors. In addition to the theoretical review, results of an experimental setup on a test tractor are shown and discussed. In general, adaptive suspensions with a damping or spring rate adoption at low frequencies are still considered as passive systems. The adaptation of the damping or spring rate in semi-active systems is carried out at frequencies higher than the natural frequency of the systems. The forces at semi-active are still dependent on relative position and velocity. Therefore these systems can only store and/or dissipate energy as well. In contrast to this active systems are capable of generating forces independent of the relative position and velocity of the suspension components. Hence, active systems are also capable of feeding energy into a suspension system. The resulting energy demand of active systems is, on the other hand, considered as the main draw back of these systems. Depending on the application, the actual energy demand required to implemented an active system could be even higher. This demand for energy has focused attention on less demanding semi-active systems. It was shown that the theoretically attainable reduction in the RMS value of the cab floor acceleration for passive cab suspension is limited to about 30 %. The technical restrictions can further limit the realization of passive cab suspension acceleration reduction. A semi-active cab suspension with a damping controlled according to the Sky-Hook principle offers, in an ideal case, an additional potential of 30 % reduction in acclerations with respect to the passive system. Measurements with an experimental semi-active cab suspension setup confirmed a potential improvement in general. Due to the technical restrictions in the implementation of the test system, the total amount of the cab floor RMS accelerations reduction was less than the predicted theoretical values. With additional suspension tuning, more advanced control algorithms and reduced friction, the potential enhancements in the comfort performance of a semi active-suspension could be realized.


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    Titel :

    Potential of semi-active controlled damping in cab suspensions on agricultural tractors


    Beteiligte:
    Scheff, Udo (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    12 Seiten, 10 Bilder, 8 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch