A special class of autonomous linear switched systems is considered, where: (a) the allowed mode switches are described by an automaton where to each state is associated a dynamics, and to each transition a switch; (b) the interval between two consecutive switching times is bounded from below. The optimal control with quadratic performance index over infinite time horizon is considered. The decision variables are the switching times and the mode sequence, under the following constraints: the mode sequence has finite length; an automaton restricts the possible switches within adjacent locations, with a cost associated to each switch; the time interval between two consecutive switches is greater than a fixed quantity. A state-feedback solution is computed off-line through a numerical procedure. The method is extended to the case of infinite number of switches. The proposed approach has been applied to design a semi-active suspension system for road vehicles. A hybrid model of the quarter-car semi-active suspension system has been considered, where each linear dynamics corresponds to a given value of the damping coefficient. The results of some numerical simulations are presented and the comparison with both passive and active suspensions is also shown.


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    Title :

    Optimal control of hybrid automata: design of a semiactive suspension


    Additional title:

    Optimalwertregelung eines hybriden Automaten: Entwurf der quasiaktiven Radaufhängung


    Contributors:

    Published in:

    Control Engineering Practice ; 12 , 10 ; 1305-1318


    Publication date :

    2004


    Size :

    14 Seiten, 9 Bilder, 2 Tabellen, 25 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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