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Since early eighties, not too many happened in analytical methods of performance valuation for actual computer and communication networks. The methods of the classic queuing theory (the mean value analysis, the convolution method) adopt unrealistic assumptions. The stochastic queuing network methods are not adequate for investigation of actual networks. Therefore, the paper presents an approximate...
The issue of state convergence property for perturbed switched linear time-delay systems is explored. By introducing the variation-of-constants formula, the conditions for state convergence property of perturbed switched linear time-delay systems are established, and the difficulties caused by the interactions between the switchings and the time delay are alleviated. Based on the general result of...
It has become a common practice to employ networks in control systems for connecting controllers and sensors/actuators on controlled plants and processes. A networked switched control system, as a special case of networked control systems, is studied. Such a system is represented with network-induced delays and packet dropout as a switched time-varying delay system. Sufficient conditions for exponential...
Synchronization problem for a class of complex networks consisting of N nonlinear dynamical nodes that are nonlinearly and diffusively coupled is solved in here. The global synchronization of such networks is investigated via Lyapunov stability theory. Under assumptions that measurements full state vectors of each node are available and coupling coefficients are known, a family of decentralized nonlinear...
This paper investigates synchronization dynamics of a complex delayed dynamical network as well as the effects of time-varying delay. Following the approach via Razumikhin theorem, simple delay-dependent synchronization criteria are derived in terms of linear matrix inequalities, which can be verified via the interior-point algorithm. The proposed criteria can deal with a fast time-varying delay in...
The use of networks in control systems to connect controllers and sensors/actuators has become a common practice. A networked switched control system, a special case of such systems, is studied in this paper by making use of linear descriptor system theory. Such a control system is modeled as switched delay systems involving network-induced delay and packet dropout. Sufficient conditions for robust...
This paper introduces an extended environment for the unscented Kalman filtering that considers also the presence of additive noise on input observations in order to solve the problem of optimal estimation of noise-corrupted input and output sequences. This environment includes as sub-cases both errors-in-variables filtering and unscented Kalman filtering. The unscented Kalman filtering to the presence...
This paper concerns the problem of robust stability analysis for a polytopic system with interval time-varying delay via parameter-dependent Lyapunov functions. By a relaxation approach with slack matrices and a descriptor model transformation of the system, the product between Lyapunov variables and the system matrices is eliminated. With this feature, a delay-dependent robust stability criterion...
This paper deals with the congestion control problem for queues in TCP/IP networks. In order to improve the congestion control performance for queues, based on the utility optimization source model proposed by Kelly, the linear and terminal sliding active queue management (AQM) algorithms are designed. Especially in the terminal sliding AQM algorithm, a special nonlinear terminal sliding surface is...
The stabilization of a class of single input switched nonlinear systems is investigated in the paper. The systems concerned are of switched upper-triangular structure. The stabilization of the switched system under some switching law is investigated. Sufficient conditions are given under which the globally asymptotically stabilization problem is solvable. We exploit the structural characteristics...
This paper concerns the problem of state-derivative feedback with exponential convergence rate for a linear system with a constant time-delay. This is promising for better applicability in practical systems where the state-derivative signals are easier to obtain than the state ones. Based on a system state transformation and appropriate Lyapunov functions, a sufficient condition for the design of...
The continue-time unscented Kalman filter (UKF) is developed to estimate the state of a jet transport aircraft. The UKF is based on the nonlinear longitudinal aircraft equations of motion, and it is designed to provide estimates of horizontal and vertical atmospheric wind inputs. The optimal state and disturbance estimates are incorporated in feedback control laws based on the slow- and fast-time-scale...
For the congestion problems in high-speed networks, a Q-learning model-independent flow controller is proposed. Because of the uncertainties and highly time-varying, it is not easy to accurately obtain the complete information for high-speed networks. In this case, the Q-learning, which is independent of mathematic model and prior-knowledge, has good performance. In this paper, the flow with higher...
The robust Hinfin control problem for the generator excitation system with the damping coefficient uncertainty and external disturbances, is addressed. Storage functions of the control system are constructed based on modified adaptive backstepping sliding mode control method and Lyapunov method. A nonlinear robust Hinfin controller and a parameter updating law are obtained simultaneously. The controller...
In this paper, the state equation for the dynamics of quarter car is established, and the nonlinear Antilock braking system is transformed into linear uncertain system model. So the stability problem of nonlinear Antilock braking systems becomes the robust stability problem of linear uncertain systems. Sliding mode control approach is employed to guarantee robust stability of linear uncertain systems...
In this paper, the state equation for the dynamics of quarter-car is established, and a stable robust sliding mode control law based on RBF neural network is presented for the vehicle slip ratio control. In addition, a moving sliding surface based on global sliding mode control is presented. Unlike the conventional sliding mode control, the moving sliding surface moves to the desired sliding surface...
This paper deals with the issues of observer-based reliable stabilization and Hinfin control for a class of continuous-time switched Lipschitz nonlinear systems in the sense that actuators suffer a ldquodestabilizing failurerdquo. When the never-faulty actuators cannot stabilize the corresponding system, the closed-loop switched systems can still be exponentially stable based on the average dwell...
This paper is concerned with the output tracking control problem for a class of nonlinear switched cascade systems with external disturbances under some average dwell-time based switching laws. The problem is solved based on the variable structure control technique and the characteristic of the system. The variable structure controllers and the average dwell-time are designed under which the output...
We address the issue of stability and convergence of perturbed switched linear time-delay systems. By introducing the variation-of-constants formula, the conditions of the stability and convergence of perturbed switched linear systems with time-delay are established, and the difficulties caused by the interaction between the switchings and time-delay are conquered. Based on the general result of perturbed...
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