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.
In this paper a finite impulse response (FIR) filter for online adaptive modeling of satellite attitude control systems is proposed, and a recursive least squares (RLS) algorithm is used to adjust the adaptive FIR filter coefficients for minimizing the output error between the monitored system and the FIR filter. The fault information can be obtained through the analysis of the adaptive FIR filter...
Empirical Mode Decomposition(EMD) is an advanced method for analyzing non-stationary signal, but there is an involved end issue in the course of getting two envelops of the data using spline interpolation. In this paper a novel method based on grey prediction model is proposed to restrain the end effect of empirical mode decomposition. In the grey prediction endpoint extension process, based on the...
In view of the nonlinear and non-stationary characteristics of fault vibration signal in roller bearing, a self-adaptive fault diagnosis method known as LMD (Local mean decomposition) is proposed. Initially the original vibration signal is decomposed into several stationary PF (product function) which possessed physical meaning and a residual component by using of LMD. Subsequently, the main components...
In this paper, we study the stability of a one-dimentional Euler-Bernoulli beam coupled with a Kelvin-Voigt damped wave equation, where the wave equation acts as a dynamic boundary feedback controller to exponentially stabilize the Euler-Bernoulli beam. Remarkably, the resolvent of the closed-loop system operator is not compact anymore. By a detailed spectral analysis, we show that the residual spectrum...
Output swarm stability problems for high-order linear swarm systems with directed interaction topologies are investigated. Firstly, sufficient conditions for output swarm stability are presented, which are independent of the dimensions of Jordan blocks of the Laplacian matrix. Then, an approach is proposed to determine the absolute output motion. Moreover, it is shown that swarm systems with the same...
Online fault diagnosis has been a crucial task for industrial processes. Reconstruction-based fault diagnosis has been drawing special attentions as a good alternative to the traditional contribution plot. It identifies the fault cause by finding the specific fault subspace that can well eliminate alarming signals from a bunch of alternatives that have been prepared based on historical fault data...
This paper mainly studies one dimensional mean-field backward stochastic differential equations (MFBSDEs) when their coefficient g is uniformly continuous in (y′, y, z), independent of z′ and non-decreasing in y′. The existence of the solution of this kind MFBSDEs has been well studied. The uniqueness of the solution of MFBSDE is proved when g is also independent of y. Moreover, MFBSDE with coefficient...
This paper proposes a new approach to reduce the data transmitted in networked control systems (NCSs) via model reduction method. Based on the controllability and observability of the remote controlled plant, the “unimportant” information of system states vector is truncated by balanced truncation method (BTM) before sending to the controller via network. The exponential stability condition of the...
In this paper, a coordinated tracking control problem is studied for coupled nonholonomic mobile robots with limited information of a reference trajectory. A distributed control law with adaptive time-varying gains is proposed to guarantee that the robots can form a prespecified geometric pattern while the centroid of the geometric pattern can track the reference signal. By designing the adaptive...
This work investigates the consensus problem of a group of nonlinear agents over a fast-switching network. The communications between agents are bidirectional and time delay exists. The topology, which specifies the communications, is assumed to be switched within a finite set of topologies, reflecting a practical fast-varying network environment. Based on the Lyapunov functional stability theory...
In this paper, we solve a leader-following problem for second-order integrator systems using only binary relative position and velocity measurements. The leader is allowed to be dynamically evolving with a bounded acceleration which is unknown to any of the followers. By properly choosing the control gains, we prove that despite the fact that only very coarse relative information is available, the...
This paper considers the problem of distributed node-to-node consensus for general linear multi-agent systems with switched pinning links. The control goal in the present work is to make each follower track the corresponding leader asymptotically under the condition that only a small fraction of followers can sense their corresponding leaders through some switched communication channels. By using...
This paper studies the mean square and almost sure consensus of discrete-time linear multi-agent systems with communication noises under Markovian switching topologies. By a sophisticated stochastic-approximation type protocol, the closed-loop dynamics of this linear multi-agent system can be transformed into a discrete-time first-order integral multi-agent system. It is proved that if all roots of...
This paper solves the problem of time synchronization in wireless sensor networks (WSNs) with noise. The consensus based approach is an improved average value based protocol. This algorithm, compared with the existing consensus-based synchronization approach, has the advantage of being totally distributed, asynchronous and robust to process and measurement noise. The main idea of this algorithm is...
This paper concerns the robust reliable guaranteed-cost H∞ control problem for delta operator switched linear systems with actuator faults. The upper bound of the guaranteed-cost function is determined and the closed-loop system can be guaranteed some H∞ performance by using time and state switching control approaches. Finally, a simulation example is provided to illustrate the proposed methods.
In this paper, we investigate the network-dependent hybrid controller design for a class of networked switched linear control systems. Sampling and network-induced delay cause the asynchronous motions between switched subsystems and the candidate controllers in both the state measurement and the switching signal. We rewrite the original networked switched linear systems by sampled asynchronous switched...
This paper investigates the problem of l1 observer design for positive switched systems with time-varying delays via delta operator approach. The purpose is to design a positive observer such that the estimated error exponentially converges to zero and the l1 -gain from the disturbance input to the estimated error is less than a prescribed level. Based on the average dwell time approach, a sufficient...
This paper is concerned with the observer-based sliding mode control (SMC) for switched stochastic systems with unmeasurable states under asynchronous switching. The state observers are designed to estimate the system states, and its switching legs behind that of the system. Based on the state estimate, the SMC problem is considered. First an integral type sliding surface is constructed and sufficient...
In this paper we investigate the cooperative output regulation problem of linear multi-agent systems with a switched exosystem which is assumed that some subsystems are Hurwitz stable, some are neutral stability, and the others are unstable. We will deal with two difficulties in the paper. One is the complexity of the switched exosystem trajectory. The other is the limited information exchanges of...
In this paper, we deal with the stabilization problem for a class of switched nonlinear systems in lower triangular form subject to constraints on the state. To prevent state from transgressing the constraints, we employ the ideal p-times differentiable unbounded functions, which grow to infinity when their arguments approach domain boundaries. Based on the backstepping technique, we propose a constructive...
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.