The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper deals with the physical modeling and the digital time simulation of acoustic pipes. We will study the simplified case of a single convergent cone. It is modeled by a linear system made of delays and a transfer function which represents the wave reflection at the entry of the cone. According to [1], the input/output relation of this system is causal and stable whereas the reflection function...
Stability is the first demand of the feedback control design. The parametrization of all stabilizing controllers is standard theory. The stabilizing controller has some free parameters which can be used for further optimization. Linear Quadratic (LQ) control and Dead Beat control are standard algorithms for optimal control of discrete time models of real systems. The dead beat control results in very...
This paper deals with discrete-time systems and considers the problem of computing an upper bound to the dwell time of switched systems ensuring a pre-specified root mean square gain (RMS). As a natural consequence of treating general systems of this particular class in terms of the order and the number of subsystems, only sufficient conditions are worked out. However, as positive features, they are...
A new approach for the design of robust static output feedback controller for a class of discrete-time Lipschitz nonlinear systems with time-varying uncertainties is proposed based on linear matrix inequalities. The controller has also a guaranteed disturbance attenuation level (Hinfin performance). Thanks to the linearity of the proposed LMIs in both the admissible Lipschitz constant of the system...
The paper presents a new discrete time sliding mode flow control algorithm for connection-oriented communication networks. The networks are modeled as discrete time systems with the available bandwidth acting as disturbance. The algorithm employs a time-varying sliding plane, which helps reduce the initial flow rate magnitude. The plane parameters are determined so that the closed-loop system stability...
In this note, we investigate the problem of state observation and input recovery of a particular class of nonlinear systems based on multi-models with unknown input. For this particular system and a corresponding observer structure, an original set of sufficient LMI conditions are derived from the Lyapunov theory, allowing to compute the gains of the observers and assuring asymptotic convergence....
The paper proposes a method for feedback stability evaluation for discrete-time, linear time-varying control systems. It is assumed that the time-varying system can be described by linear matrices operators, equivalent to general discrete-time, time-varying state space model with nonzero input-output delay. The main used tools are Bode diagrams approximated for time-varying systems, using power spectral...
The problem of stabilizing positive switching discrete-time systems by output feedback is studied and solved in this paper. First, necessary and sufficient conditions for the existence of such controllers are presented for non-switching positive systems, which are then extended to positive switching systems. The proposed conditions, formulated as LMIs, can be directly used for controller synthesis...
This paper describes a solution to the problem of landing a helicopter autonomously. The methodology used poses the problem as a discrete time path following control problem where a conveniently defined error state space model of the helicopter is modified to include the aerodynamic effects of flying within close proximity to the ground. An affine parameter-dependent model representation is adopted...
In this paper we explore the geometry of a particular navigation scheme which guides a pursuer from a fixed initial position to a given fixed final position using a one-step look ahead strategy and using only bearing measurements. We explicitly characterize the optimal trajectories for the problem in terms of the Cramer-Rao bound such that the derived trajectories permit a minimization in the error...
For sequential jumps detection, isolation and estimation in discrete-time stochastic linear systems, (A.S. Wilsky et al., 1976) have developed the generalized likelihood ratio (GLR) test. After each detection and isolation of one jump, the treatment of another possible jump is obtained by a direct state estimate and covariance incrementation of the Kalman filter originally designed on the jump-free...
In this paper we study the stability of discrete-time plants in a networked control setting, employing an approach known as model-based networked control systems (MB-NCS) with Intermittent Feedback. Model-Based Networked Control Systems use an explicit model of the plant in order to reduce the network traffic while attempting to prevent excessive performance degradation, while Intermittent Feedback...
This contribution presents a novel approach for robust fault detection and isolation in continuous-time and discrete-time linear systems based-on modified H2/Hinfin performance conditions, which are described as LMIs. In order to synthesize the residual signals, some theoretical results for systems with perturbation signals and subjected to parametric uncertainty are shown. The uncertainty parameters...
The paper suggests to apply a proper output weight to achieve guaranteed discrete algebraic Riccati equation (DARE) solvability of the LQ optimal control problem with output tracking. Usually a positive semi definite state weighting matrix (Q) is mentioned to be sufficient for solvable DARE. However, the literature also proposes more general rank conditions. The paper shows a sufficient condition...
A complex system of coal and methane outbursts has the characteristics coupled, randomized and abrupt change for the system variant, which is a difficult problem to predict coal and methane outbursts using the accurate and effective approach. We proposed a novel generalized quantum neural network called GQNN which can be used to predict coal and methane outbursts. First, we give the influence factors...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.