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This paper presents a comparison between two state estimation methods for processes with asynchronous and delayed measurements in order to verify which of these techniques is better in terms of dynamic behavior and possibilities of implementation in a real time processor. The methodologies are analyzed through simulations that allow a comparison in a visual form, through error index and with the time...
With the omnipresence of the Internet of Things and poorly secured devices with it in combination with high bandwidth networks, Distributed Denial of Service (DDoS) attacks have become one of the biggest threats for network security. With high bandwidth attacks flooding network infrastructure, the pressure to secure the attack targets shifts more and more to the network operators. Often without direct...
This paper deal with the problem of H∞ robust fault estimation for discrete time nonlinear system with a sector bounded nonlinear additive terms and multiple bounded state delay using the Takagi-Sugeno (T-S) fuzzy model. A fuzzy-fault estimation observer (FFEO) design is proposed to achieve fault estimation of T-S state delay models using fuzzy Lyapunov functions (FLF) with actuator and sensor faults...
Vibrotactile systems are convenient solutions for managing interaction between automatic control systems and humans. This paper develops a vibrotactile assistance system (VAS) for high performance bicycles. The system is designed to assist the rider during braking in order to minimize the time to stop, increasing performances and safety. The proposed control architecture is the result of the low cost...
ECN thresholds have limited operational range and very strict scope. Lower thresholds exacerbate the queue underflow while higher thresholds increase the queueing delays. In this paper, an Adaptive ECN (A-ECN) marking scheme is proposed to enhance the performance of ECN. A-ECN can adaptively adjust ECN marking thresholds in different scenarios to achieve good generality. Therefore, network operators...
In this paper, the problem of positive observer design of linear positive systems is studied. This paper aims to providing new design approaches for positive observers of linear positive systems. First, an efficient continuous-time positive observer design approach is proposed by using linear programming such that the observer error system is exponentially stable. Then, the results are also extended...
In this paper, we consider sensor spoofing attacks such as the replay attack. We define three types of the repeated replay attack as the open-loop repeated replay attack using stored data, the bias injection-type repeated replay attack, and the closed-loop repeated reply attack. Using the adaptive cruise controller model, we show the LQI controller stabilizes the system in the face of the bias injection-type...
This paper studies the problem of fault estimation (FE) and fault tolerant control (FTC) for a class of Takagi-Sugeno (T-S) fuzzy system with interval time-varying delay. We design an adaptive observer-based controller to obtain the estimation of fault, and while guaranteeing the filtering error system to be asymptotically stable, then, based on the information of online fault estimation, a dynamic...
This paper proposes a newly distributed reduced order agreement protocols based on the observer to investigate the consensus problem of high-order multi-agent systems with various agents and non-uniform delay of various time and directed communication topology. First, on the basis of Riccati equation, Lyapunov method, as well as Algebraic-Graph theory, a novel algorithm with multistep, is provided...
The paper addresses design of a clean grain throughput observer for a combine harvester, i.e. delay free yield sensing. The aim is to predict grain throughput changes using the forward speed and a throughput sensor in the feederhouse. By utilising a grain flow model and sensor fusion an estimate of the current grain throughput is obtained, hence the effect from the lag in the momentary yield sensor...
This paper investigates the leader-following consensus problem for general linear multi-agent systems with time-varying delay. An observer-based distributed triggering mechanism is proposed to solve this problem. For each agent, the update of the designed distributed event-triggered controller only requires the knowledge of its neighbors' states at its own event time instants. A sufficient condition...
An output-feedback control system for uncertain single-input-single-output linear systems with arbitrary delay in the output signal is developed. The state of the system is estimated by observers connected in cascade. Unlike previous works, parametric uncertainties are allowed. Their effects are analyzed by using the Small-Gain Theorem. The proposed control strategy guarantees global stability of...
The problem of delay-dependent observer-based robustly passive control is addressed for neutral type descriptor Markov jump systems with time-varying delays. The parameter uncertainties of the system are assumed unknown and norm-bounded. Using Lyapunov-Krasovskii functional method and weighted matrix, a delay-dependent robustly passive condition for closed-loop system is given. Then, the sufficient...
This study focuses on the design of controller and observer for linear networked control systems subject to event-triggered scheme and data losses. Event-triggered scheme is employed to prevent unnecessary data from being released to the network so as to save network resource. Then, we take the data losses into account which may be happened on the released data, and for handling this, a Bernoulli...
This paper investigates the unknown input estimation for a large class of linear systems with commensurate delays. A Luenberger-like observer plus a high order sliding mode differentiator are proposed by involving only the past and actual values of the system output. Sufficient conditions are given to guarantee the existence of such an unknown input estimator.
Predictive display is a promising approach to tackle large time delays that greatly degrade the performance of tele-operation systems. In this paper, a unified predictive display scheme is proposed to deal with multi-time-delay multi-rate measurements and missing data, which is applicable for real systems. Firstly, a formal description of predictive display problem is introduced. Next the method principle...
Observing and estimating system's states are the conditions to realize the effective control in the control and communication engineering field. In this paper for nonlinear descriptor jumping systems, proposed a novel observer, considered the nonlinear perturbation and network communication time-varying delay. A novel full-order delay dependent observer design method is developed by using system stability...
This paper deals with the problem of H∞ full-order observer design for discrete-time linear singular systems with disturbance inputs and time-varying delay in state variables. A delay-dependent sufficient conditions is presented to guarantee the considered observer to be stable and satisfy the prescribed H∞ performance γ. The main procedure is based on Lyapunov-Krasovskii stability theory, where the...
ZooKeeper is a widely used distributed coordination and synchronization service for distributed applications. It relies on the built-in atomic broadcast protocol Zab to provide high availability and guarantees such as totally ordered updates for the overlying applications. ZooKeeper’s flexibility, however, is limited with regard to the underlying Zab protocol.In this work, we propose to switch ZooKeeper’s...
In this paper, the Discrete Controller Synthesis (DCS) technique is applied in order to obtain a correct-by- construction automatic distributed scheduling of Wireless Sensor Network (WSN). Our approach starts from an abstract formal model considering that communication between nodes are instantaneous. Then, a refined model is obtained by adding a realistic communication mechanism while preserving...
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