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The free-weighting matrix approach is employed to investigate the output feedback control of linear discrete-time systems with an interval time-varying delay. First, a delay-dependent stability analysis is carried out using a new method of estimating the upper bound on the difference of a Lyapunov function without ignoring any useful terms; and a design(More)
A comprehensive discussion on the potential conservatism of a descriptor model transformation approach is given and the stability/stabilization of time-delay systems are reconsidered by using an integral inequality recently established. A refined delay-dependent stability condition, which includes the one by the descriptor model transformation approach as a(More)
This paper addresses the problem of tracking period signals for systems subject to input actuator nonlinearity. This kind of nonlinearities widely exists in actuators. This makes the design of controller complicated. In this paper, an equivalent-input-disturbance approach is utilized to estimate the effects of nonlinearities on the output channel, and then(More)
This paper gives an integrated fuzzy-control solution of singularity problem in the motion control of an acrobot. First, the singularity that arises in motion control based on Lyapunov function is explained. Then, a fuzzy controller is employed to regulate one of parameters of the control law to solve the singularity problem in the motion control occurred(More)
A linear-matrix-inequality (LMI) based method is presented in this paper to design a modified repetitive-control system with a dynamic output-feedback controller for a class of strictly proper plants. Employing the continuous lifting technique, a continuous-discrete two-dimensional (2D) model is built that converts the system design problem into a(More)
This paper presents a sequential growing-and-pruning learning algorithm employing an unscented or extended Kalman filter (SGAPL-UKF or SGAPL-EKF) for a recurrent neural network (RNN). The RNN is constructed using a sequential-learning algorithm that employs growing-and-pruning (GAP) criteria based on the concept of the significance of hidden neurons to(More)
This paper extends the equivalent-input-disturbance method to disturbance rejection in an MIMO servo system. It explains the configuration of a control system with a disturbance estimator and a design method based on the concept of perfect regulation. Simulations on the tracking control of a dual-stage system demonstrated the validity of the method.
The equivalent-input-disturbance (EID) approach is presented for time-delay systems with periodic disturbances in this paper. For the construction and the stability analysis with traditional equivalent-input-disturbance (EID) methodology being inadequate in time-delay systems, we propose a new configuration to reject periodic disturbances. First, we change(More)
This paper deals with the high precision speed control problem in a 2-mass system, and introduces the concept of equivalent input disturbance to design a servo controller. This method rejects the influence of disturbances and to guarantee the high-precision speed tracking of the given trajectory by estimating an equivalent input disturbance. After(More)
This paper deals with the problem of designing an output feedback repetitive control system based on continuous-discrete two-dimensional (2D) hybrid model for a class of regular linear systems. First, by analyzing of the continuous control process and discrete learning process independently, a hybrid continuous-discrete 2D model for the output feedback(More)