A feedback control method for the stabilization of a nonlinear diffusion system on a graph

In this paper, we consider the internal stabilization problems of FitzHugh-Nagumo （FHN） systems on the locally finite connected weighted graphs, which describe the process of signal transmission across axons in neurobiology. We will establish the proper condition on the weighted Dirichlet-Laplace operator on a graph such that the nonlinear FHN system can be stabilized exponentially and globally only using internal actuation over a sub-domain with a linear feedback form.

基于Graph图形控件技术的休哈特控制图设计与实现

以Adaptive Server Anywhere为后台数据库管理系统,以PowerBuilder为前台开发工具,利用Graph图形控件技术设计与实现了质量管理中休哈特控制图的计算机绘制。该方法可广泛应用于质量管理信息系统的开发中。

基于Visual Graph的电气控制仿真

主要介绍软件VisualGraph在电气控制电路仿真方面的应用。以“电动机正反转控制”为例,说明如何利用VisualGraph实现对电气控制电路的仿真。

S7-GRAPH在桑葚饮料生产线控制系统中的应用

传统的桑葚饮料加工系统各设备分立,加工转运过程需要大量的人工,生产效率低下并且生产成本高。本文使用西门子PLC S7-GRAPH编程软件为桑葚生产线设计了控制流程,并且介绍了S7-GRAPH和别的编程方法相比较的优点。

A Novel Multi-agent Formation Control Law With Collision Avoidance

In this paper a stable formation control law that simultaneously ensures collision avoidance has been proposed.It is assumed that the communication graph is undirected and connected.The proposed formation control law is a combination of the consensus term and the collision avoidance term(CAT).The first order consensus term is derived for the proposed model,while ensuring the Lyapunov stability.The consensus term creates and maintains the desired formation shape,while the CAT avoids the collision.During the collision avoidance,the potential function based CAT makes the agents repel from each other.This unrestricted repelling magnitude cannot ensure the graph connectivity at the time of collision avoidance.Hence we have proposed a formation control law,which ensures this connectivity even during the collision avoidance.This is achieved by the proposed novel adaptive potential function.The potential function adapts itself,with the online tuning of the critical variable associated with it.The tuning has been done based on the lower bound of the critical variable,which is derived from the proposed connectivity property.The efficacy of the proposed scheme has been validated using simulations done based on formations of six and thirty-two agents respectively.

Visual Graph动画在“电气控制与PLC技术”教学中的应用

Visual Graph是近年来出现的新型图形交互和动画展示技术,具有直观性好、交互性强等优点。文章从“电气控制与PLC技术”课程的实际教学效果出发,讨论了课程动画辅助教学的需求分析和规划,并展示了典型动画设计案例,供广大教学人员参考。

Research of the Control Domain of Edges in Regression Testing

Regression testing is the process of validating modified software to provide confidence that the changed parts of the software behave as intended and that the unchanged parts have not been adversely affected by the modifications. The goal of regression testing is to reduce the test suit by testing the new characters and the modified parts of a program with the original test suit. Regression testing is a high cost testing method. This paper presents a regression testing selection technique that can reduce the test suit on the basis of Control Flow Graph (CFG). It import the inherit strategy of object-oriented language to ensure an edge’s control domain to reduce the test suit size effectively. We implement the idea by coding the edge. An algorithm is also presented at last.

The Formation Control of Multi-agent Systems on a Circle

This paper investigates the formation control of a class of multi-agent systems moving on a circle, whose topology is a cyclic graph, and presents several new results for the following two cases: Case I, the agents with single-integrator kinematics,and Case II, the agents with double-integrator kinematics. Firstly,for Case I, two control protocols are proposed under which the multiagent systems keep a uniformly-spaced formation. Secondly,we study Case II, and a control protocol is designed for this case, then the stability of the formation is proved. Finally, three simulations are studied by using our presented results. The study of illustrative examples with simulations shows that our results as well as designed control protocols work very well in studying the formation control of this class of multi-agent systems.

Distributed tracking control of unmanned aerial vehicles under wind disturbance and model uncertainty

A distributed robust method is developed for cooperative tracking control of unmanned aerial vehicles under unknown wind disturbance and model uncertainty. The communication network among vehicles is a directed graph with switching topology. Each vehicle can only share its states with its neighbors. Dynamics of the vehicles are nonlinear and affected by the wind disturbance and model uncertainty. Feedback linearization is adopted to transform the dynamics of vehicles into linear systems. To account for the wind disturbance and model uncertainty, a robust controller is designed for each vehicle such that all vehicles ultimately synchronize to the virtual leader in the three-dimensional path. It is theoretically shown that the position states of the vehicles will converge to that of the virtual leader if the communication network has a directed spanning tree rooted at the virtual leader. Furthermore, the robust controller is extended to address the formation control problem. Simulation examples are also given to illustrate the effectiveness of the proposed method. © 2016 Beijing Institute of Aerospace Information.

Model-Based Fault Tolerant Control for Hybrid Dynamic Systems with Sensor Faults

A model-based fault tolerant control approach for hybrid linear dynamic systems is proposed in this paper. The proposed method, taking advantage of reliable control, can maintain the performance of the faulty system during the time delay of fault detection and diagnosis (FDD) and fault accommodation (FA), which can be regarded as the first line of defence against sensor faults. Simulation results of a three-tank system with sensor fault are given to show the efficiency of the method.

Leader-following formation control of multi-agent networks based on distributed observers

To investigate the leader-following formation control, in this paper we present the design problem of control protocols and distributed observers under which the agents can achieve and maintain the desired formation from any initial states, while the velocity converges to that of the virtual leader whose velocity cannot be measured by agents in real time. The two cases of switching topologies without communication delay and fixed topology with time-varying communication delay are both considered for multi-agent networks. By using the Lyapunov stability theory, the issue of stability is analysed for multi-agent systems with switching topologies. Then, by considering the time-varying communication delay, the sufficient condition is proposed for the multi-agent systems with fixed topology. Finally, two numerical examples are given to illustrate the effectiveness of the proposed leader-following formation control protocols.

Experiments in Consensus-based Decentralized Information Feedback Control Strategies on a Real Robotic Fish Platform

A decentralized information feedback mechanism was introduced to a group of mobile robots such that the robots asymptotically converge to a given moving formation. While various distributed cooperative control strategies have been studied in theory,few of them have been systematically validated on experimental platforms. This paper demonstrates the experimental results of consensus-based decentralized information feedback mechanism on a multiple mobile robotic fish platform. In this paper, we firstly introduced a fundamental consensus algorithm for systems model and the cooperative control experimental platform,and then experimentally implemented and validated the formation control algorithm through setting transit point and lookup table method and so on. The experimental results show the effectiveness of the consensus-based decentralized information feedback control strategies.

Consensus Control for a Kind of Dynamical Agents in Network

This paper discusses consensus control for a kind of dynamical agents in network. It is assumed that the agents distributed on a plane and their location coordinates are measured by remote sensor and transmitted to its neighbors. By designing the linear distributed control protocol, it is shown that the group of agents will achieves consensus. The simulations are given to show the effectiveness of our theoretical result.

Mean Square Containment Control of Multi-agent Systems with Transmission Noises

为有传播噪音的多代理人系统的抑制控制问题被考虑。由于噪音的存在，腐烂的获得功能被介绍稀释噪音。动态地交换拓扑学并且随机交换拓扑学被考虑。通讯图和控制获得功能上的足够的条件被导出保证吝啬的方形的抑制。一些数字例子被提供验证结果。

Stability Analysis and Hadamard Synergic Control for a Class of Dynamical Networks

Hadamard synergic control is a new kind of control problem which is achieved via a composite strategy of the state feedback control and the direct regulation of the part of connection coefficients of system state variables. Such a control is actually used very often in the practical areas. In this paper, we discuss Hadamard synergic stabilization problem for a class of dynamical networks. We analyze three cases: 1) Synergic stabilization problem for the general twonodenetwork. 2) Synergic stabilization problem for a special kind of networks. 3) Synergic stabilization problem for special kind of networks with communication timedelays. The mechanism of the synergic action between two control strategies: feedback control and the connection coefficients regulations are presented.

基于双流自适应图卷积网络的管制员睡岗行为识别

为识别空中交通管制员的睡岗行为,减少管制差错,保障航空器飞行安全,提出了一种基于双流自适应图卷积网络的管制员睡岗行为识别方法。该方法设计双流网络分别处理管制员骨架的一阶信息和二阶信息,实现对骨架数据的充分提取;通过自适应学习的骨骼拓扑连接矩阵,挖掘管制员不同关节之间的功能连接关系;同时在卷积层引入时空通道注意力机制,增强管制员睡岗行为识别模型在时间、空间、通道3个方向提取重要信息的能力。仿真结果表明,该方法能有效识别管制员3种睡岗行为,相较于传统的时空图卷积网络,识别准确率提高了3.08百分点,达到95.03%,可以提高民航运行安全管理水平。

OPTIMAL CONTROL PROBLEM OF PARABOLIC DIFFERENTIAL EQUATION WITH TWO POINT BOUNDARY CONDITION

This paper deals with optimal control problem of parabolic differential equation with two point boundary conditions tin the time variable). The results here extend those in [3] on optimal control of the heat equations. Moreover, the technique used in this paper is based on some smooth approximations of 'tangent cones' in the sense of Clarke and some maximal monotone operators.

Reduced Model Based Control of Two Link Flexible Space Robot

Model based control schemes use the inverse dynamics of the robot arm to produce the main torque component necessary for trajectory tracking. For model-based controller one is required to know the model parameters accurately. This is a very difficult task especially if the manipulator is flexible. So a reduced model based controller has been developed, which requires only the information of space robot base velocity and link parameters. The flexible link is modeled as Euler Bernoulli beam. To simplify the analysis we have considered Jacobian of rigid manipulator. Bond graph modeling is used to model the dynamics of the system and to devise the control strategy. The scheme has been verified using simulation for two links flexible space manipulator.

基于CiteSpace的国内冲击地压防治文献可视化知识图谱分析

为探究我国冲击地压防治领域的研究历程及进展,采用CiteSpace软件对1994—2023年间收录于CNKI数据库的2891篇该领域研究文献进行可视化知识图谱分析。首先探明文献在时间轴及发表期刊的分布情况,然后针对研究机构和研究人员进行共现分析,最后通过关键词的聚类、共现和突现分析,对国内冲击地压防治领域的研究文献进行分析总结。研究结果表明:我国冲击地压防治研究发展历程,可按时间划分为稳定发展期、爆发增长期和持续波动期;以《煤炭学报》《煤矿安全》《煤炭科学技术》《采矿与安全工程学报》等期刊为主要交流平台;主要研究力量包括窦林名、潘一山、姜福兴等核心作者团队及中国矿业大学、辽宁工程技术大学、煤炭科学研究总院有限公司等研究机构,且组织之间合作较频繁;“厚硬顶板、动静载、巨厚砾岩、能量耗散、围岩协同控制、水力压裂”等是研究领域的高频关键词;根据关键词突现,得到随时间变化的关键词演化图谱。研究结果以期为冲击地压防治领域的研究提供科学参考。