DISCRETE-TIME VARIABLE STRUCTURE CONTROLLER FOR AIRCRAFT ELEVATOR CONTROL

Olivera Iskrenović-Momčilovic

   A discrete-time variable structure controller for aircraft elevator control using the method for control of plants with finite zeros in canonical subspace is proposed in this paper. First, a discrete mathematical model of the system over canonical space, using the delta transform, is given. Then, decomposition of the canonical space to subspaces with and without control is carried out by introducing the output variable delta transform. Finally, a relation providing the quasi-sliding mode over the canonical subspace with control is derived. The realized system is stable and robust against parameter and external disturbances.

Keywords: discrete-time variable structure system, canonical space, aircraft, elevator

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