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.
Necessary and sufficient stability conditions are given for the existence of a continuous Lyapunov function for a semicontinuous, stochastic discrete-time system. The continuity of the Lyapunov function is linked to robustness of the stability property, which reduces to classical stability plus convergence for deterministic systems. The nature of the Lyapunov results are inspired by Lyapunov results...
Event-triggered and self-triggered control have recently been proposed as an alternative to periodic implementations of feedback control laws over sensor/actuator networks. In event-triggered control, each sensing node continuously monitors the plant in order to determine if fresh information should be transmitted and if the feedback control law should be recomputed. In general, event-triggered control...
We present a motion descriptor for human action recognition where appearance and shape information are unreliable. Unlike other motion-based approaches, we leverage image characteristics specific to human movement to achieve better robustness and lower computational cost. Drawing on recent work on motion recognition with ballistic dynamics, an action is modeled as a series of short correlated linear...
The observer-based integral adaptive fuzzy sliding mode controllers are developed for a class of uncertain nonlinear systems. By designing the state observer, the fuzzy systems, which are used to approach any unknown functions, it can be constructed using the state observer-based estimations. Based on Lyapunov stability theorem, the proposed integral adaptive fuzzy sliding mode control system can...
Intensive computation is a potential problem in nonlinear multi-objective control based on numerical simulation. The purpose of this paper is to extend analytical multiobjective parameter synthesis (AMOPS) to nonlinear field. Two proposal extension methods, namely, feedback linearization (FL) and state-dependent coefficient (SDC) approach are introduced and discussed in detail. Furthermore, in order...
The phenomenon of long term instability of iterative learning control systems is examined. The concept of stability with respect to a specified trajectory is used to define a nonlinear biased gap metric. The resulting robust stability theorem, applied in a 2D setting, is used to prove the robust stability of a set of ILC algorithms engaged in trajectory tracking. The robust stability guarantee is...
In this paper, we present a delay-dependent robust model predictive control (MPC) algorithm for a class of discrete-time linear state-delayed systems subjected to polytopic-type uncertainties and input constraints. The state-feedback MPC law is calculated by minimizing an upper bound of the worst-case quadratic cost function over an infinite time horizon at each sampling instant. In contrast to existing...
In this paper, we study the global robust output regulation for a class of weakly minimum phase nonlinear systems. By employing the internal model design technique, we first convert the problem into a global robust stabilization problem of an augmented system whose structure has not been encountered before. Then we develop a methodology to solve this stabilization problem via state feedback, by utilizing...
In this article, a robust linear controller design in time domain is presented for linear fractional-order systems with nonlinear model uncertainties. The Gronwall-Bellman lemma is employed to investigate the robust stability conditions which are based on the upper norm-bounds of the uncertainties. The parameters of a dynamic controller are selected to satisfy the requirements of robust stability...
This paper addresses the quantized stabilization problem for single-input Markov jump systems. Mode-dependent and mode-independent quadratic control Lyapunov functions based on the availability of mode information at controller/quantizer are considered for the quantized feedback. Similar to the linear time-invariant case, it is shown that a mode-dependent (respectively, mode-independent) logarithmic...
Repetitive processes are a distinct class of two-dimensional (2D) systems (i.e. information propagation in two independent directions occurs) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or (often) 2D systems theory. In this paper we begin the development a systems theory for a model...
The disturbance observers have been used to estimate the disturbance in the plant. Several papers on design methods of disturbance observers have been published. The parametrization of all disturbance observers for plants with any output disturbance was clarified. However, no paper examines the parametrization of all disturbance observers for plants with any input disturbance. In this paper, we clarify...
The biological regulatory networks present common features because they have evolved until obtaining robust architecture of interactions, able to resist to perturbations like changes in boundary conditions like those induced by microRNAs or in updating rules deciding what genes are co-expressed. We present here some examples of these types of robustness by successively studying the boundary and updating...
In this paper, sliding mode control (SMC) is applied to regulate the dq axis currents of a 6 phase induction machine (6PIM). This strategy presents a good alternative in power electronics for electrical drives because of its dynamic properties and its high robustness. The design of the sliding mode control law, defined from the healthy mode model, is based on the linear feedback with switched gains...
In this paper, new results on finite-time control of delayed systems subject to exogenous disturbance are presented. Applying the Lyapunov function theory, several sufficient conditions are established for robust finite-time stabilization.
In this paper, we explain the architecture and provide implementation details of a synchronous collaborative tool we created using a lightweight Web 2.0 mash-up development methodology. This approach allowed us to put together a client interface with reasonable capabilities, scalability, and robustness rapidly. The rapid development of this tool also allowed us to perform thorough testing and incorporation...
This paper deals with a problem of controller adaptation for a system known to be in a certain set of linear time-invariant systems. It is assumed that there exists a set of linear stabilizing controllers. A method for calculating a minimum switching time between controllers commonly known as dwell time such that stability of the closed loop linear time-varying system is guaranteed is given in this...
This paper addresses the problem of robust tracking control for nonlinear systems with external disturbances. The nonlinear system is represented by the discrete-time Takagi-Sugeno (T-S) fuzzy model. The control scheme is based on Hinfin performance to attenuate the tracking error as small as possible for the external disturbances. The stability of the whole closed-loop model is investigated using...
In this paper we study robustness of aggregation in networks of coupled identical systems driven by possibly different external inputs. This property is guaranteed by providing a finite L2 gain condition for the closed-loop system. We show, for a class of systems, how robustness depends on the connectivity of the underlying communication graph. Applications range from coordination problems where there...
This paper considers the robust control of an active radial magnetic bearing system, having a homopolar, external rotor topology, which is used to support an annular fiber composite flywheel rim. A second-order dynamical compensator is used for control, its design being based on a linearized one-dimensional model which is treated as an interval system in order to cope with parameter uncertainties...
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.