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Consensus strategies find extensive applications in coordination of robot groups and decision-making of agents. Since balanced graph plays an important role in the average consensus problem and many other coordination problems for directed communication networks, this work explores the conditions and algorithms for the digraph balancing problem. Based on the analysis of graph cycles, we prove that a digraph can be balanced if and only if the null space of its incidence matrix contains positive vectors. Then, based on this result and the corresponding analysis, two weight balance algorithms have been proposed, and the conditions for obtaining a unique balanced solution and a set of analytical results on weight balance problems have been introduced. Then, we point out the relationship between the weight balance problem and the features of the corresponding underlying Markov chain. Finally, two numerical examples are presented to verify the proposed algorithms. 相似文献
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针对有向图上一类不确定性多智能体系统,研究一体化参数辨识与一致性控制策略.在现有模型参考自适应一致性(Model reference adaptive consensus, MRACon)框架基础上,结合动态回归因子扩张与融合(Dynamic regressor extension and mixing, DREM)技术,提出两类改进的MRACon控制协议,即固定耦合DREM-MRACon和自适应耦合DREM-MRACon.其中,自适应耦合DREM-MRACon在有向支撑树结构上具有时变的耦合增益.与MRACon相比,此两类改进算法均能保证系统未知参数的有限时间辨识.此外,固定耦合DREM-MRACon保证了多智能体系统的指数时间一致性,而自适应耦合DREM-MRACon则克服了对于全局网络拓扑特征信息的依赖性.最后,通过数值仿真验证了理论成果的有效性. 相似文献
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We discuss a new consensus problem – a group consensus problem – in networks of dynamic agents. For a complex network consisting of several sub-networks owing to physical quantities or task distributions, it is concerned with this case that the agents in a sub-network share a consistent value while there is no agreement between any two sub-networks. When the information exchange is directed, a novel consensus protocol is designed to solve the group consensus problem. The convergence analysis is discussed and several criteria are established based on graph theories and matrix theories. Simulation results are presented to demonstrate the effectiveness of the theoretical results. 相似文献
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Yinsheng Li;Bing Wang;Yuquan Chen; 《国际强度与非线性控制杂志
》2024,34(16):11250-11266
》2024,34(16):11250-11266
In this paper, the prescribed-time consensus problem of multi-agent systems with finite control gain is investigated. A novel control Lyapunov function (CLF) framework for prescribed-time stability is developed by using the time space deformation approach. For both leaderless and leader-following prescribed-time consensus, new switching time-varying gain-based protocols are proposed, in which, the infinite time-varying control gain is turned off before the prescribed time and the global boundedness of control gain is thus guaranteed. It is mathematically proved that the agents equipped with the proposed protocols can achieve less conservative prescribed-time consensus in both leaderless cases and leader-following cases, on the basis of the developed CLF framework. The superiority of the proposed prescribed-time protocols in terms of consensus accuracy, control energy consumption, and control peak value is demonstrated through comparison simulations using illustrative examples. 相似文献
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In this article, finite-time consensus algorithms for a swarm of self-propelling agents based on sliding mode control and graph algebraic theories are presented. Algorithms are developed for swarms that can be described by balanced graphs and that are comprised of agents with dynamics of the same order. Agents with first and higher order dynamics are considered. For consensus, the agents' inputs are chosen to enforce sliding mode on surfaces dependent on the graph Laplacian matrix. The algorithms allow for the tuning of the time taken by the swarm to reach a consensus as well as the consensus value. As an example, the case when a swarm of first-order agents is in cyclic pursuit is considered. 相似文献
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Muhammad Ahsan Razaq Muhammad Rehan Muntazir Hussain Shakeel Ahmed Keum-Shik Hong 《Asian journal of control》2023,25(5):4096-4112
This paper investigates a local observer-based leader-following consensus control of one-sided Lipschitz (OSL) multi-agent systems (MASs) under input saturation. The proposed consensus control scheme has been formulated by using the OSL property, input saturation, directed graphs, estimated states, and quadratic inner-boundedness condition by attaining the regional stability. It is assumed that the graph always includes a (directed) spanning tree with respect to the leader root to develop matrix inequalities for investigating parameters of the proposed observer and consensus protocols. Further, a new observer-based consensus tracking method for MASs with saturation, concerning independent topologies for communicating outputs and estimates over the network, is explored to deal with a more perplexing and realistic situation. In contrast to the traditional methods, the proposed consensus approach considers output feedback and deals with the input saturation for a generalized class of nonlinear systems. The efficiency of the obtained results is illustrated via application to a group of five moving agents in the Cartesian coordinates. 相似文献
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This paper discusses the consensus problem of second‐order multiagent systems with nonlinear dynamics. A directed spanning tree–based adaptive control protocol is developed, which overcomes the drawback that the spectrum of the Laplacian matrix must be known a priori. A scheme for reordering the nodes is proposed. Applying the developed method and the Lyapunov stability theory, some distributed adaptive laws are designed in the directed network. It is found that the consensus can be achieved by randomly choosing a directed spanning tree and using the developed distributed adaptive law. Finally, an example is presented to illustrate the theoretical analysis. 相似文献
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基于带有非线性动态的二阶多智能体系统,研究了在有动态领导者条件下的跟踪一致性问题。假设跟随者只能获取邻居智能体的相对状态信息,只有一部分跟随者可以获得领导者的位置和速度信息,领导者的控制输入非零且不被任何一个跟随者可知。在通信拓扑为无向连通图的条件下,为了避免全局信息的不确定性,设计了分布式自适应控制协议。将系统的一致性问题转化为误差系统的一致性问题,通过Lyapunov稳定性理论和矩阵理论分析得到了该协议使系统达到一致的充分条件。最后用仿真例子证明了设计方法的有效性。 相似文献
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The edge event-triggered consensus control for multi-agent systems with single- or double-integrator dynamics under directed communication topologies is investigated in this paper. With the edge event-triggered sampling strategies, a class of novel consensus protocols is proposed to reduce control update frequency. The main features of the proposed edge event-triggered control include three aspects: (i) measurement errors are defined based on directed information flow and thus they allow that the communication topology is directed, (ii) each individual controller updates its output only when the associated edge event occurs and the control actions are independent of other agents, and (iii) the proposed edge event-triggered control does not exhibit Zeno behaviour and it is shown that the inter-event intervals are lower bounded by a positive constant. In the consensus analysis, matrix transformation techniques are used to convert the high-dimensional system into a low-dimensional system, and some sufficient consensus conditions are derived for the multi-agent systems with single- or double-integrator dynamics. Finally, the effectiveness of the edge event-triggered sampling strategies is illustrated by simulations. 相似文献
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In this paper, the leader-following consensus problem of fractional-order multi-agent systems is considered via adaptive pinning control. The dynamics of leader and all followers with linear and nonlinear functions are investigated, respectively. We assume that the node should be pinned if its in-degree is less than its out-degree in the paper. Under this assumption and based on the stability theory of fractional-order differential systems, some leader-following consensus criteria are derived, which are easily obtained by matrix inequalities. The control of each agent using local information is designed and detailed analysis of the leader-following consensus is presented. The design technique is based on algebraic graph theory and the Riccati inequality. Several simulation examples are presented to demonstrate the effectiveness of the proposed method. 相似文献
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针对一类模型未知的离散时间非线性多智能体系统聚类一致性问题,提出一种无模型自适应控制算法.首先,假设系统具有固定拓扑,利用伪偏导数概念得到系统的数据关系模型,在考虑多智能体之间耦合系数条件下给出聚类一致性误差,在此基础上设计一种数据驱动的聚类一致性跟踪控制协议;然后,采用压缩映射方法在理论上分析了跟踪误差的收敛性,结果表明所提出算法不需要智能体模型信息即可完成跟踪任务,是一种数据驱动的控制方法;最后,将结果拓展至随机切换拓扑结构的多智能体系统中,数值仿真结果验证了所提出算法的有效性. 相似文献
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针对未知异构非线性多智能体系统一致性跟踪问题,设计基于控制器动态线性化的分布式直接型无模型自适应PID控制算法,仅使用被控系统的输入输出数据以及智能体间的拓扑结构关系进行控制器参数整定,不受被控系统数学模型的限制.首先利用动态线性化技术将受控系统以及理想控制器等效转换成相应的动态数据模型,基于理想控制器的动态数据模型设计控制器结构以及参数自适应更新算法;然后利用压缩映射以及盖尔圆盘定理进行误差收敛分析;最后进行大量仿真对比,验证所设计控制算法的有效性和优越性. 相似文献
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针对由离散时间一阶和二阶智能体组成的混合阶多智能体系统,研究其在固定和切换拓扑结构下受通信时滞影响时的组一致性问题。分别为两类智能体提出组一致性协议,引入模型变换,将闭环系统转化为等价系统。在一定假设条件下,以代数图论、矩阵理论为主要研究工具,分别在固定和切换拓扑结构下给出了混合阶多智能体系统实现渐近组一致性的条件。采用数值仿真对所得结果的有效性进行了验证。 相似文献
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研究通讯拓扑为符号有向图的人在环多机械臂系统的预设性能二分一致性跟踪控制问题. 为在预设时间内收敛到预设精度, 提出一种基于观测器的预设性能控制策略. 首先, 设计预设时间和精度的观测器以估计领导者的输出信息, 通过合作/竞争信息交互实现观测器输出的二分一致性. 该观测器不需要领导机械臂的输入信息及输出信息的高阶导数, 并通过无芝诺行为的事件触发机制降低不同机械臂间的通讯负担. 其次, 通过反步法及误差转化法将有约束的机械臂输出跟踪问题转化为无约束的误差系统稳定性问题, 进而基于观测器输出设计机械臂的输出调节控制器. 值得一提的是, 设计的控制策略不需要系统初始状态的先验知识且避免了预设时刻控制增益无穷大的现象, 增强了系统的可靠性. 最后, 仿真结果表明所提控制策略的可行性及优越性. 相似文献
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Xiangkai Wu;Yuxiao Liu;Jiang Long;Wei Wang; 《国际强度与非线性控制杂志
》2024,34(8):4978-4998
》2024,34(8):4978-4998
In this article, the distributed adaptive asymptotical consensus tracking control is considered for a class of high-order nonlinear multi-agent systems with matched unknown parameters under the event-triggered communication mechanism. The controllers, adaptive laws and triggering conditions are presented under directed topology with a spanning tree, relieving communication burden among the connected agents since continuous monitoring of in-neighbors is no longer needed. To handle the cross-coupling term associated with asymmetric Laplacian matrix and unknown parameters of all agents when the candidate Lyapunov function is defined in terms of local consensus errors, adaptive immersion and invariance control technique is adopted. Adaptive estimators are also designed to estimate the constants related to global information, with which the proposed control scheme is fully distributed. It is shown that all closed-loop system signals are globally uniformly bounded and all agents can track the reference signal asymptotically while ruling out Zeno behavior though a subset of the agents cannot have direct access to the reference signal information. A numerical example is illustrated to show the effectiveness of the proposed control protocol. 相似文献