Deterministic control of uncertain systems

In the deterministic control of uncertain multivariable systems robust closed-loop control is achieved for a specified magnitude range of a class of parameter variations and disturbances. These nonlinear time-varying systems employ nonlinear control functions. The two main approaches are Lyapunov control and variable structure control. The development of the theory of this latter class of control systems will be briefly reviewed here and particular reference will be made to the eigenstructure assignment approach. The use of a CAD package VASSYD allows for straightforward design and simulation studies. Desirable robustness and invariance properties are readily obtained.