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  1. Disturbance Observer-Based Robust Formation-Containment of Discrete-Time Multiagent Systems with Exogenous Disturbances.Chengjie Xu, Bofan Li & Yi Yuan - 2021 - Complexity 2021:1-11.
    This paper investigates robust formation-containment control of discrete-time multiagent systems with exogenous disturbances. Based on the discrete-time disturbance observer method, both state feedback and output feedback control protocols are proposed. Formation-containment conditions are obtained and convergency analysis is given according to Lyapunov stability theory. And, the corresponding control gains are obtained by solving some discrete-time algebraic Riccati equations. Numerical simulations are presented to illustrate the theoretical findings.
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  • Intermittent Time-Varying Formation Control for High-Order Networked Agents Subject to Discontinuous Communications.Lixin Wang, Zhe Luo, Xiaoqiang Li, Xinsan Li & Xiaogang Yang - 2021 - Complexity 2021:1-14.
    This paper investigates the leaderless and leader-follower time-varying formation design and analysis problems for a group of networked agents subject to discontinuous communications. Firstly, a leaderless time-varying formation control protocol is proposed via the intermittent control strategy, where the control input of each agent is constructed by the distributed local state information and formation instructions in the communication time unit, but it is zero in the noncommunication time unit. Then, an explicit formulation of the formation center function is determined to (...)
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  • Guaranteed Cost Formation Tracking Control for Swarm Systems with Intermittent Communications.Purui Zhang, Xiaoqian Chen & Xiaogang Yang - 2020 - Complexity 2020:1-13.
    The current paper studies guaranteed cost time-varying formation tracking design and analysis problems of high-order swarm systems subject to intermittent communications. Different from the existing work of the time-varying formation control, the time-varying formation tracking can be achieved while certain performance can be guaranteed, and the impacts of the intermittent communications and switching topologies are considered. First, a new intermittent time-varying formation tracking control protocol with a global performance index is proposed, where not only the formation regulation performances but also (...)
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  • Network Pseudohealth Information Recognition Model: An Integrated Architecture of Latent Dirichlet Allocation and Data Block Update.Jie Zhang, Pingping Sun, Feng Zhao, Qianru Guo & Yue Zou - 2020 - Complexity 2020:1-12.
    The wanton dissemination of network pseudohealth information has brought great harm to people’s health, life, and property. It is important to detect and identify network pseudohealth information. Based on this, this paper defines the concepts of pseudohealth information, data block, and data block integration, designs an architecture that combines the latent Dirichlet allocation algorithm and data block update integration, and proposes the combination algorithm model. In addition, crawler technology is used to crawl the pseudohealth information transmitted on the Sina Weibo (...)
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  • Energy-Limited Time-Varying Formation Control for Second-Order Multiagent Systems.Wanzhen Quan, Yulong Zhao & Xiaogang le WangYang - 2020 - Complexity 2020:1-15.
    The energy-limited time-varying formation control problem of second-order multiagent systems is addressed for both leaderless and leader-following communication topologies in this paper. Different from the previous results, the joint consideration of energy limitation and formation design is more challenging and practical. First, an ETVF control protocol is presented, and the total energy supply is pregiven and limited, which is more common in practical applications. Then, by an orthogonal transformation, the formation control problem is converted into the consensus stabilization problem for (...)
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  • Optimal Control for Networked Control Systems with Markovian Packet Losses.Xiao Han, Zhijian Ji & Qingyuan Qi - 2020 - Complexity 2020:1-11.
    This paper is concerned with the optimal output feedback control problem for networked control systems with Markovian packet losses. In this paper, the packet losses occur both between the sensor and controller and between the controller and actuator. Moreover, the packet loss channels are described with two-state Markov chains. Since the precise state information cannot be obtained, thus an optimal recursive estimator is designed. Furthermore, by adopting the dynamic programming approach, we derive the optimal output feedback control, which is based (...)
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  • Formation Tracking for High-Order Time-Invariant Swarm Systems with Limited Energy and Fixed Topologies.Jianye Yang, Cheng Wang, Hongtao Dang & Xinzhong Han - 2020 - Complexity 2020:1-14.
    The current paper investigates design and analysis problems of formation tracking for high-order linear time-invariant swarm systems, where communication topologies among agents have leader-following structures and the whole energy supply is limited. Firstly, the communication topology of a swarm system is depicted by a directed graph with a spanning tree, where the communication channels from the leader to followers are directional and the communication channels among followers are bidirectional, and a new formation tracking protocol with an energy integral term and (...)
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  • Limited-Budget Formation Control for High-Order Linear Swarm Systems with Fix Topologies.Hongtao Dang, Yan le WangZhang & Jianye Yang - 2020 - Complexity 2020:1-11.
    This paper discusses limited-budget time-varying formation design and analysis problems for a high-order linear swarm system with a fixed communication topology. Firstly, the communication topology among agents is modeled as an undirected and connected graph, and a new formation control protocol with an energy integral term is proposed to realize formation control and to guarantee the practical energy assumption is less than the limited energy budget. Then, by the matrix inequality tool, sufficient conditions for limited-budget formation design and analysis are (...)
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  • Synchronization-Based Guaranteed-Performance Formation Design for Swarm Systems.Hongtao Dang, Yichen Du, Lingyun Kong, Hui Yao & Jianxiang Xi - 2020 - Complexity 2020:1-13.
    Guaranteed-performance formation control for swarm systems with the second-order dynamics is investigated based on the synchronization control strategy. Firstly, a new formation protocol is presented, where the weights of connected edges are adaptively regulated and the performance constraint is imposed. Then, on the basis of the Riccati inequality, sufficient conditions for synchronization-based guaranteed-performance formation are proposed, and an explicit expression of the guaranteed-performance cost is shown, where it is fully distributed to design gain matrices of the formation protocol in the (...)
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  • On the Group Controllability of Leader-Based Continuous-Time Multiagent Systems.Bo Liu, Licheng Wu, Rong Li, Housheng Su & Yue Han - 2020 - Complexity 2020:1-11.
    The group controllability of continuous-time multiagent systems with multiple leaders is considered in this paper, where the entire group is compartmentalized into a few subgroups. The group controllability concept of continuous-time MASs with multiple leaders is put forward, and the group controllability criteria are obtained for switching and fixed topologies, respectively. Finally, the numerical simulations are given to prove the validity of the theoretical results.
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  • Bipartite Consensus of Heterogeneous Multiagent Systems Based on Distributed Event-Triggered Control.Xiaoyu Wang, Kaien Liu, Zhijian Ji & Shitao Han - 2020 - Complexity 2020:1-14.
    In this paper, the bipartite consensus problem of heterogeneous multiagent systems composed of first-order and second-order agents is considered by utilizing the event-triggered control scheme. Under structurally balanced directed topology, event-triggered bipartite consensus protocol is put forward, and event-triggering functions consisting of measurement error and threshold are designed. To exclude Zeno behavior, an exponential function is introduced in the threshold. The bipartite consensus problem is transformed into the corresponding stability problem by means of gauge transformation and model transformation. By virtue (...)
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  • Event-Based Consensus for General Linear Multiagent Systems Under Switching Topologies.Yinshuang Sun, Zhijian Ji & Kaien Liu - 2020 - Complexity 2020:1-14.
    In this paper, event-triggered leader-following consensus of general linear multiagent systems under both fixed topology and switching topologies is studied. First, centralised and decentralised event-triggered control strategies based on neighbors’ state estimation are proposed under fixed topology, in which the controller is only updated at the time of triggering. Obviously, compared with the continuous time control algorithms, the event-triggered control strategies can reduce the communication frequency among agents effectively. Meanwhile, event-triggering conditions are derived for systems to achieve consensus by using (...)
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  • On the Observability of Leader-Based Multiagent Systems with Fixed Topology.Bo Liu, Ningsheng Xu, Housheng Su, Licheng Wu & Jiahui Bai - 2019 - Complexity 2019:1-10.
    This paper investigates the observability of first-order, second-order, and high-order leader-based multiagent systems with fixed topology, respectively. Some new algebraic and graphical characterizations of the observability for the first-order MASs are established based on agreement protocols. Moreover, under the same leader-following framework with the predefined topology and leader assignment, the observability conditions for systems of double-integrator and high-integrator agents are also obtained. Finally, the effectiveness of the theoretical results is verified by numerical examples and simulations.
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