An approach is presented for designing the Hinfinity/GH2 static-output feedback controller for vehicle suspensions by using LMIs (Linear Matrix Inequalities) and GAs (Genetic Algorithm). Three main performance requirements for an advanced vehicle suspension are considered. Among these requirements, the ride-comfort performance is optimized by minimizing the Hinfinity norm of the transfer function from the road disturbance to the sprung mass, acceleration, while the road-holding performance and the suspension deflection limitation are guaranteed by constraining the generalized H2 (GH2) norms of the transfer functions from the road disturbance to the dynamic tyre load and the suspension deflection to be less than their hard limits, respectively. At the same time, the controller saturation problem is considered by constraining its peak response output to be less than a given limit using the GH2 norm as well. A four-degree-of-freedom half-car model with active suspension system is applied. Several kinds of H2/ GH2 static-output feedback controllers, which use the available sprung mass velocities or the suspension deflections as feedback signals, are obtained by using the GAs to search for the possible control gain matrices and then resolving the LMIs together with the minimization optimization problem. These designed H2/GH2 static-output feedback controllers are validated by numerical simulations on both the bump and the random road responses which show that the designed H2/GH2 static-output feedback controllers can achieve similar or even better active suspension performances compared with the state-feedback control case in spite of their simplicities.


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    Title :

    Designing H-infinity/GH2 static-output feedback controller for vehicle suspensions using linear matrix inequalities and genetic algorithms


    Additional title:

    Entwurf eines statischen H-<sub>unendlich</sub>/GH<sub>2</sub>-Ausgangsrückführungsreglers für Fahrzeugradaufhängungen mittels linearen Matrixungleichungen und genetischen Algorithmen


    Contributors:
    Du, H. (author) / Zhang, N. (author)

    Published in:

    Vehicle System Dynamics ; 46 , 5 ; 385-412


    Publication date :

    2008


    Size :

    28 Seiten, 10 Bilder, 11 Tabellen, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English