Optimal disturbance rejection for the nonlinear delay systems is of important meaning in theory and practice.

This thesis discusses the optimal control problem of a class of bilinear systems with the worst disturbance rejection.

The optimal disturbance control problems of nonlinear differential equations system are discussed in Rn.

Disturbance Rejection for Nonlinear Time-Delay Systems Affected by Persistent Disturbances;

Consequently the problem of disturbance rejection for zero steady-state error is transformed into the optimal control problem for systems without disturbances.

In addition,Sontag s formula is used to develop the design approaches for the finite-time stable,quasi-contractively stable and disturbance rejection controllers.

We then apply the passivity theory to studies of disturbance attenuation, and put forward concise conditions guaranteeing negative output feedback to solve disturbance attenuation problems.

On the basis of Lyapunov stability theory, nonlinear robust adaptive controllers and parameter adaptive laws for speed tracking and flux tracking with unknown load torque and equivalent bounded disturbances are developed by using adaptive backstepping algorithms, nonlinear damping and disturbance attenuation techniques, and guaranteed that the system is in the s.

Tracking control and disturbance attenuation is the basic control in actual project.