Bounded Consensus Algorithms for Multi‐Agent Systems in Directed Networks

In this paper, the consensus problem is investigated via bounded controls for the multi‐agent systems with or without communication. Based on the nested saturation method, the saturated control laws are designed to solve the consensus problem. Under the designed saturated control laws, the transient performance of the closed‐loop system can be improved by tuning the saturation level. First of all, asymptotical consensus algorithms with bounded control inputs are proposed for the multi‐agent systems with or without communication delays. Under these consensus algorithms, the states’ consensus can be achieved asymptotically. Then, based on a kind of novel nonlinear saturation functions, bounded finite‐time consensus algorithms are further developed. It is shown that the states’ consensus can be achieved in finite time. Finally, two examples are given to verify the efficiency of the proposed methods.     

基于BP网络的机场助航故障灯检测

恒流调光器是为飞机起降提供目视引导的关键设备。对回路中故障灯的准确及时检测是调光器的重要功能。有关调光器的国际标准以及国标对该设备的功能均有严格要求,然而相关资料尚属鲜见难于借鉴。文中对这一课题进行了探讨,利用BP神经网络对调光器回路中的故障,进行监测并测算故障灯数目。实践表明,文章所用方法能有效地监测调光器故障,并能准确报告故障灯数目。     

浅谈网络安全风险的评估方法

本文通过分析网络系统风险的概念及评价体系建设原则,针对风险评估的流程进行探讨,并就应注意的几个问题提出几点建议。以期通过本文的阐述为网络管理人员更好地制定安全策略提供有效的技术支持。     

网络教学心得

该文主要讲了网络教学中必须掌握的知识要点。     

基于DSP的磁流变阻尼器信号预处理

磁流变阻尼器是一种效率高,响应快,耗能低的智能阻尼器,在众多领域具有广泛应用前景.本文设计并实现了以硬件调理加软件调理相结合的磁流变阻尼器传感器信号预处理方案,此方案中硬件部分采用了集成开关电容滤波器MF10,软件部分采用了去极值递推均值滤波并加入线性误差补偿算法,满足了磁流变阻尼器控制器信号预处理的要求,亦可作为其它信号预处理的参考.     

智能机器人运动关节集成驱动控制器研究

根据智能机器人的控制要求,提出了机器人控制系统的顶层核心控制器和底层运动控制器的双层结构,底层与顶层基于CAN总线完成关节状态信息的上传和运动指令的下达.在此基础上,采用高速DSP、IPM功率智能模块、光电编码器、无刷直流电机等构建了机器人运动关节集成驱动控制器的硬件电路,并完成了相应软件设计.结果表明,这种集成驱动控制器简化了层间联系,提高了响应速度,增加了整体集成度,有利于运动关节的驱动控制一体化.     

Peterson算法在场消隐期传输中的应用

场消隐期作为应用电视有限资源的一部分,其开发潜力正逐渐为人们所重视.本文提出了一种新型的综合数据传输业务的单缆传输电视监控系统,将控制信号搭栽在视频信号通道上运行,并以Peterson算法和Chien氏搜索法为基础,将无线通信中常用的(15,7)BCH控制编码应用于底层的单片机级的信号传输中,同时给出了相应的软件解码方法,在优化控制信号的传输线路和解决时延问题的同时,大大提高了实时数据通信的有效性和可靠性,从而达到了利用电视信号逆程资源的目的.     

基于Hyper Mesh的商用车驱动桥壳有限元分析

驱动桥壳是汽车的重要部件之一,应具有足够的强度和刚度。先利用UG建立桥壳的几何模型,然后在Hyper Mesh中进行网格划分、加载和约束,对驱动桥壳进行有限元分析计算,最后提出改进方案。     

Control of frictional dynamics of a one-dimensional particle array

Control of frictional forces is required in many applications of tribology. While the problem is approached by chemical means traditionally, a recent approach was proposed to control the system mechanically to tune frictional responses. We design feedback control laws for a one-dimensional particle array sliding on a surface subject to friction. The Frenkel-Kontorova model describing the dynamics is a nonlinear interconnected system and the accessible control elements are average quantities only. We prove local stability of equilibrium points of the un-controlled system in the presence of linear and nonlinear particle interactions, respectively. We then formulate a tracking control problem, whose control objective is for the average system to reach a designated targeted velocity using accessible elements. Sufficient stabilization conditions are explicitly derived for the closed-loop error systems using the Lyapunov theory based methods. Simulation results show satisfactory performances. The results can be applied to other physical systems whose dynamics is described by the Frenkel-Kontorova model.