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The problem of fault detection for a class of continuous-time nonlinear networked control systems subject to delays induced by the networks from the sensor to controller and from controller to actuator is concerned in this paper. An observer-based fault detection filter is designed. A sufficient condition is also derived which makes the closed-loop system asymptotically stable in terms of linear matrix...
This paper deals with the problem of reachable set bounding for interval time-varying delay system with disturbances. A generalized reciprocally convex combination lemma and a new Lyapunov-Krasovskii functional (LKF) are given to obtain the delay-dependent criterion. The reachable set of time-varying delay systems with bounded peak disturbances is contained in the ellipsoid base this result. Meanwhile,...
In this paper, the bipartite consensus problems are investigated for multi-agent systems with double-integrator dynamics and antagonistic interactions. We consider bipartite consensus under the given protocol, which means that the absolute value of the position is the same when all the velocities of agents are 0, but the sign may be opposite. When there are no delays, the necessary and sufficient...
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...
After analyzing the shortcomings of existing synchronization methods based on GPS and the research status of synchronization for Crosswell Electromagnetic Imaging Logging Tool(CEMIT), a feasible synchronization method combined the actual conditions of CEMIT with the basis of existing research is proposed. First of all, GPS receiver provides a high accurate 1PPS, which received by Surface System, and...
Second-order system of lacking damper was an alyzed and studied, and a kind of control strategy namei overlapping control was proposed to overcome the overshoo problem. By converting an input signal into two signals whicl have certain relationships on amplitude and phase to counterac the overshoot of the system, and the response speed can also b guaranteed. The parameters of overlapping control were...
In this paper, we propose a predictor-based sliding mode control algorithm for LTI systems with input-delay and disturbance. It is shown that our proposed algorithm can completely reject the constant disturbance from the state channel. It is also shown that with our proposed algorithm, an enhanced disturbance rejection can be achieved for a large class of other time-varying disturbances. Simulations...
Frequency-domain criterion on containment control for general linear multi-agent systems with time delay is studied under the directed network topology. A distributed protocol with time-invariant delay is proposed. When time-delay is an unknown constant, frequency-domain criterion on containment control of general linear multi-agent systems with delay is obtained, and an upper bound of delay is given...
This paper is concerned with the stability analysis of networked control problems for polynomial systems. Owing to existing network-induced random delays of the forward and feedback communication links in a direct-drive control system, the input signals have time-varying delays. Based on the Lyapunov functional and by utilizing the Jensen inequality technique, the controller can be computed in terms...
In this paper, a recursive filtering method based on Kalman filter is proposed for the sensor delay in each state measurement of power system. Due to sampling frequency in the power system is generally high in milliseconds, the network topology is unchanged and the system state does not change much, therefore the system state at the next moment can be approximately linear relationship with the current...
This paper discusses the time synchronization issue in wireless sensor networks. An event-triggered average consensus time synchronization algorithm is proposed. This algorithm uses the average time message from one node's one-hop neighbors to update the clock parameters of the node. And it achieved acceptable synchronization accuracy. We also proposed an event-trigger mechanism to reduce the communication...
Average-consensus filter problem is investigated for a mixed-order multi-agent system, which consists of first-order and second-order agents, and the proportional-integral consensus filter algorithms are proposed for the agents with different constant inputs. Based on generalized Nyquist stability criterion, sufficient convergence conditions are obtained for the multiagent system under a fixed, symmetric...
This paper is concerned with globally asymptotical synchronization of fractional-order memristor-based neural networks (FMNNs) with multiple time-varying delays. Based on the definition of memristors, a more practical model of FMNNs with multiple time-varying delays is constructed from the integerorder counterparts. FMNNs are represented by fractional-order differential equations with discontinuous...
Accurate and fast detection of harmonics is the basis for active filters to work regularly. Propose an improved generalized IP-IQ harmonic detection algorithm. Analyzed generalized IP-IQ harmonic detection algorithm, pointed out two advantages of this algorithm: It can separate any order of harmonic and detect harmonic correctly even if the voltage of grid is distorted. But the generalized IP-IQ algorithm...
This paper investigates the formation cooperation problem of networked autonomous underwater vehicles (AUVs). By considering the underwater communication environments, the impulsive communication scheme with logarithmic quantization is developed. Moreover, the effects of time-varying transmission delays in the communication channels are taken into account. By means of impulsive control theory, distributed...
With the rapid development of computer networks, a variety of network applications continue to emerge, resulting in a surge of network data traffic. Therefore, the network congestion becomes more serious. Congestion control is facing many problems, including latency, fairness, stability and so on, especially the instability of the network caused by transmission delay. We introduce the traditional...
Finite-time consensus of heterogeneous multi-agent system (MAS) with external disturbances is investigated in this paper. Distributed control algorithm is designed for the agents described by leaderless MAS. It can be shown that the state errors of any two agents reach a region in finite time with external disturbances by using Lyapunov stability analysis and algebraic graph theory. At last, one example...
This paper is concerned with the consensus problem for general first-order multi-agent systems over undirected topology. Under the assumption that the topology is connected and every agent receives neighbors information with time-varying communication delay, allowable delay bound depending on the agent dynamics, topology structure and the control gain is obtained. In particular, in case of first-order...
This paper addresses the stability results of a Markov jump linear system with parameter uncertainties and time-varying delay. A geometric sequence based method is used for delaypartitioning. Then, a modified geometric sequence division (GSD) dependent augmented Lyapunov-Krasovskii functional (LKF) is constructed with respect to the state variables forming in geometric progression. By employing the...
In this paper, the robust distributed state estimation problem is investigated for a class of discrete-time nonlinear delayed systems over sensor networks with redundant channels. In order to improve the reliability and quality of the communication signal transmission services, redundant channel transmission is utilized to model the communication measurement. The purpose of the addressed problem is...
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