In this article, the state estimation problem of a continuous-time linear time-invariant system is investigated for situation with unknown external disturbance and measurement noise. A robust distributed interval observer designed, which consists group sensors communicating others through directed graph where each sensor can only access partial information from output plant. The communication among together heterogeneity undetectability result in some stringent requirements on construction....

This paper addresses the consensus problem for two-layered MASs (multi-agent systems) subject to attacks on communication edges. Unlike most existing MAS models, considered are allowed have heterogeneous inner topologies between different layers. By using linear transformation technique, some sufficient criteria first given achieve among leaders within leader layer where condition that interaction topology has directed spanning trees with a fixed root required in works been removed....

This paper develops a new high-gain observer design method for nonlinear systems that has lower gain compared to the standard observer. observer, called HG/LMI is obtained by combining methodology with LMI-based technique. Through analytical developments, this shows how provides gains, it applies multinonlinear functions, and analyzes performance in presence of measurement noise and/or delayed output measurements. A numerical example given illustrate increasing advantage increase observer's...

This work addresses the distributed consensus tracking problem for an extended class of high-order nonlinear multiagent networks with guaranteed performances over a directed graph. The adding one power integrator methodology is skillfully incorporated into protocol so as to tackle high powers in fashion. distinguishing feature proposed design, besides guaranteeing closed-loop stability, that some transient-state and steady-state metrics (e.g., maximum overshoot convergence rate) can be...

This article aims to realize event-triggered constrained consensus tracking for high-order nonlinear multiagent networks subject full-state constraints. The main challenge of achieving such goals lies in the fact that standard designs [e.g., backstepping, control, and barrier Lyapunov functions (BLFs)] successfully developed low-order dynamics fail work dynamics. To tackle these issues, a novel mechanism is devised update actual control input, lowering communication computation burden. More...

Interval Observer Design and Consensus of MultiAgent Systems with Time-Varying Uncertainties

In this note, we generalize our results on synchronization of homogeneous Lur'e networks by static, relative state information based protocols from Zhang et al to the case that for each agent only measurements are available. We establish sufficient conditions under which a linear dynamic protocol exists such networks. These involve feasibility two LMI's together with coupling inequality, reminiscent well-known LMI in H∞ control measurement feedback. show that, regardless number agents...

Dual-wavelength chaos is generated in one erbium-doped fiber laser. Tunable optical filters (TOF) are used to select the wavelengths. The generation of achieved by either modulating pump laser diode near relaxation oscillation frequency or introducing modulation through an electrooptic modulator built into each wavelength branch. receiver fabricated with identical parameters as transmitter except for open loop structure. By tuning TOF receiver, synchronization observed two Thus, it can pave...

Whereas synchronization (consensus, agreement) in linear networks has been thoroughly studied recent years up to certain exhaustiveness, reaching a synchrony among general nonlinear agents still remains hard open problems. In this paper, we propose criteria of undirected with nodes, based on the idea incremental dissipativity. We show that our result implies number existing criteria, employing Lyapunov functions (such as e.g. sum squared deviations between agents' states). At same time,...

In this paper, we consider the problem of cooperatively localizing a formation networked mobile robots/vehicles in SE(2), and adapting to reduce localization errors. First, propose necessary sufficient conditions establish when team robots with heterogeneous sensors can be completely localized. We present experimental measurements range bearing omni-directional cameras motivate simple model for noisy sensory information. measure quality localization, show how directly depends on sensing...

This paper introduces a test-bench concept for high power variable frequency drives that can work reliably also with weak and limited grid. Experimental results are shown 10MW+ drive test bench only remote 1.25MVA feeding transformer supply. Common "pump-back" configurations circulate the via supply produces huge distortions potential instabilities grids. Hence, we virtual 50 or 60 Hz grid is not connected to Only losses fed from directly dc-link of one VFD simple diode rectifier. Since...

In this paper we deal with robust synchronization problems for directed Lur'e networks subject to incrementally passive nonlinearities and sector bounded non-linearities, respectively. By making use of general algebraic connectivities strongly connected graphs subgraphs, sufficient conditions are obtained diffusively interconnected identical systems on both the interconnection topology containing a spanning tree. The static feedback gain matrices determined by defining individual agent...

Summary In this paper, we study robust cooperative output regulation problems for a directed network of Lur'e systems that consist nominal linear dynamics with an unknown static nonlinearity around it through negative feedback. We assume the part each agent is identical, but nonlinearities are allowed to be different distinct agents. sense, heterogeneous. As common in context systems, assumed sector bounded within one given sector. The interconnection graph among these agents contain...

In this research, we propose Log2Graph, a new insider threat detection method based on graph convolution neural network (GCN). This first retrieves the corresponding logs and features from log files through feature extraction. Specifically, use an auxiliary of anomaly index to describe relationship between entities, such as users hosts, instead establish complex connections them. Second, these are augmented combination oversampling downsampling, prepare for next-stage supervised learning...

This paper deals with robust synchronization problems for networks of diffusively interconnected identical Lur'e systems subject to incrementally passive nonlinearities and sector bounded nonlinearities, respectively. Whereas in stabilization one single system the conditions passivity boundedness nonlinear feedback loop are commonly assumed, our context networked we adopt stronger assumptions incremental boundedness. Throughout this interconnection topologies among these assumed be...

Event‐triggered coordinated attitude control problem for satellite formation under switching topology is investigated in this article. First, triggering function with state error designed to adjust update period of controller. Event triggered, information sampled, and controller updated if only condition satisfied, while nontriggering time uses time. Then, the existence model uncertainties, distributed adaptive based on event‐triggered strategy proposed leader‐follower architecture. Under...

In this article, we generalize the results on self-synchronization of Lur'e networks diffusively interconnected through dynamic relative output-feedback from undirected graph case in Zhang et al. 2016 to general directed case. A linear protocol same structure is adopted as one proposed 2016. That is, Lur'e-type nonlinearity not involved our protocol. It fact unknown and only assumed be incrementally sector bounded within a given sector. absence leader system defining synchronization...

In this paper, we consider the problem of cooperatively localizing a formation networked robots/vehicles in SE(2). First, propose necessary and sufficient conditions to establish when team robots with heterogeneous sensors can be localized. We then show how these are analogous well-known results literature on kinematics planar mechanisms. localization is equivalent solving system nonlinear closure equations. Depending what available for each robot, multirobot modeled as sensing graph...

In this letter, the joint synchronization and localization problem in asynchronous networks using time-of-arrival measurements is addressed. A novel two-step method proposed. Step 1, we estimate clock skew by a linear weighted least squares estimator. 2, obtain second-order cone program (SOCP) applying relaxation technique to jointly source node location offset. The relaxed SOCP further tightened adding regularization term. Moreover, simple procedure of selecting factor Simulation results...

In this paper, we study cooperative robust output regulation problems for a directed dynamical network of diffusively interconnected Lur'e systems that consist nominal linear dynamics with an unknown static nonlinearity around it. the present paper assume part each agent is identical, but nonlinearities are allowed to be different distinct agents. sense heterogeneous. As common in context systems, these assumed passive or sector bounded. The interconnection graph among agents contain...