Longitudinal control system design is considered for a linearized dynamic model of a supersonic transport aircraft concept characterized by relaxed static stability and significant aeroelastic interactions. Two LQG-type controllers are designed using the frequency-domain additive uncertainty formulation to ensure robustness to unmodeled flexible modes. The first controller is based on a 4th-order model containing only the rigid-body modes, while the second controller is based on an 8th-order model that additionally includes the two most prominent flexible modes. The performance obtainable from the 4th-order controller is not adequate, while the 8th-order controller is found to provide better performance. Frequency-domain and time-domain (Lyapunov) methods are subsequently used to assess the robustness of the 8th-order controller to parametric uncertainties in the design model.


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    Title :

    Longitudinal Control of High Speed Aircraft in the Presence of Aeroelastic Modes


    Contributors:
    S. M. Joshi (author) / A. G. Kelkar (author)

    Publication date :

    1996


    Size :

    30 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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