Deterministic control of uncertain systems

In direct contrast to adaptive controllers the deterministic control of uncertain time-varying systems control is achieved using fixed nonlinear feedback control functions, which operate effectively over a specified magnitude range of a class of system parameter variations. There is no requirement for online identification of the values of the system parameters. Furthermore no statistical information of the system variations is required to yield the desired robust dynamic behaviour. If the parameter variations satisfy certain matching conditions, complete insensitivity to system variations can be achieved. The two main approaches, variable structure control (VSC) and Lyapunov control, are described