The space vehicle with flexible appendage can be characterized as a multi-time scale nonlinear system with small perturbation parameters,while the condition is that most of existing control approaches are for multi-time scale linear system and require the model of the system known exactly.

Identification of nonlinear time varying systems based on recurrent neural networks;

As it is well known,it is difficult to identify a nonlinear time varying system using traditional identification approaches,especially under unknown nonlinear function.

The performance of the algorithm is evaluated on the identification of some typical time-varying nonlinear system including the three degrees of freedom structural system with nonlinear time-varying stiffness.

A fuzzy logic approach to optimal control of nonlinear time-delay systems;

For a class of nonlinear time-delay systems with unknown control directions,using backstepping techniques and introducing Nussbaum gain function,a constructive design procedure is given for the output feedback stabilization.

The sufficient conditions that enable the system to be decoupled are discussed,and the input-output linearization conditions with the canonical form of this nonlinear time-delay system are presented.

Robust H_∞ control of a class of nonlinear delay systems via state feedback;