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M. Staroswiecki G. Hoblos A. Aitouche 《International Journal of Adaptive Control and Signal Processing》2004,18(1):55-72
This paper addresses the problem of fault tolerant estimation and the design of fault tolerant sensor networks. Fault tolerance is defined with respect to a given estimation objective, namely a given functional of the system state should remain observable when sensor failures occur. Redundant and minimal sensor sets are defined and organized into an automaton which contains all the subsets of sensors such that the estimation objective can be achieved. Three criteria, which evaluate the system fault tolerance with respect to sensor failures when a reconfiguration strategy is used, are introduced: (strong and weak) redundancy degrees (RD), sensor network reliability (R), and mean time to non‐observability (MTTNO). Sensor networks are designed by finding redundant sensor sets whose RD and/or R and/or MTTNO are larger than some specified values. A ship boiler example is developed for illustration. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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针对成百上千甚至上万颗卫星组成的大型复杂天基组网星座,单靠地面测控网难以满足对卫星实时管控的问题,以及单靠星座组网自主测控存在的长时间偏离地面基准(时间和空间基准)等风险,本文综合考虑地面测控网以及星间组网的优势,提出大型组网星座自主运行的平行系统方法。通过构建天地一体平行系统,在ACP框架作用下,形成以组网星座自主处理为主、地面平行系统支持为辅的天地一体平行运行机制,从而实现大型组网星座自主管控、自主观测、自主处理和自主监测等自主运行功能。研究结果表明,本文提出的方法在大型复杂星座的自主运行方面具有参考价值。 相似文献
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基于复杂网络理论的电力通信网脆弱性分析 总被引:4,自引:0,他引:4
以复杂网络理论为基础,对电力通信网进行拓扑建模、基本参数计算和网络特性分析,对于确保电力系统安全运行和加强电网健壮性有重要影响。针对电力通信网的业务特点,依据度数、介数指标找出网络脆弱点,修改传统效能函数,并以此函数作为衡量网络脆弱性的指标,确定网络脆弱点。最后,以某2个实际电力通信网为例进行了网络特性分析,针对不同故障模式对其进行攻击脆弱性仿真。根据仿真结果,分析了异构网络的本质脆弱性,总结了影响电力通信网脆弱性的因素。 相似文献
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基于复杂网络理论及电力系统有功分布的实际特点,并考虑发电节点和负荷节点的有功注入,采用准稳态功率转移分布因子建立改进支路权重模型,该模型可以从支路承担有功传送的功率大小角度反映系统节点之间的连接强度.基于此,建立基于改进支路权重定义下的电力网络测度模型,该模型能够从电网传送有功以及电网拓扑结构角度综合体现系统元件复杂网络特性的多样性和差异性.算例分析结果验证了所提模型的有效性和可行性. 相似文献
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电信网络二象模型及其复杂网络系统特性 总被引:1,自引:0,他引:1
本文根据二象结构理论,将电信网络分为以平台网络构成的实象和以价值网络构成的虚象,建立了电信网络的二象模型;在分析了由二象作用关系形成的电信网络复杂性的基础上,将电信网络视为一个复杂网络,采用中国东北地区业务网络调查数据,将行政管理区域管理的子网络(域)作为节点,将域和域之间相连的光缆作为边,分别以有效话务量和占用话务量作为节点权重,分析了权重分布的无标度性.进而,提出了应用"二象"模型和复杂网络的理论指导电信网络行为策略制定的一些思考. 相似文献
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近年来频繁发生的大停电事件引起人们对电网可靠性的广泛关注.基于复杂网络理论,提出一种电网结构脆弱性分析方法,依据线路电抗和电压作为介数值指标来衡量电网的脆弱线路.通过分析IEEE39节点系统,证实了该方法的有效性和实用性. 相似文献
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Qian Xu Guangdeng Zong Yunjun Chen Ben Niu Kaibo Shi 《International Journal of Adaptive Control and Signal Processing》2023,37(2):474-496
This paper investigates the command filter-based adaptive neural network tracking control problem for uncertain nonsmooth nonlinear systems. First, an integral barrier Lyapunov function is introduced to deal with the symmetric output constraint and make the output comply with prescribed restrictions. Second, by the Filippov's differential inclusion theory and approximation theorem, the considered nonsmooth nonlinear system is converted to an equivalent smooth nonlinear system. Third, the Levant's differentiator is used to deal with the “explosion of complexity” problem. An error compensation mechanism is established to attenuate the effect of the filtering error on control performance. Then, an adaptive neural network controller is set up by resorting to the backstepping technique. It is strictly mathematically proved that the tracking error can converge to an arbitrarily small neighborhood of the origin and all the signals in the closed-loop system are semi-globally uniformly ultimately bounded. Finally, a numerical example and an application example of the robotic manipulator system are provided to demonstrate the availability of the proposed control strategy. 相似文献
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专家模糊神经网络控制系统在复杂工业过程中的应用 总被引:3,自引:0,他引:3
针对复杂工业过程控制系统的特点,提出一种专家系统和模糊神经网络相结合的二级协调智能控制系统。该系统的执行控制级由模糊神经控制器完成,协调级由专家系统完成。经仿真和复杂过程回转窑温控实验表明,控制系统具有良好的性能。 相似文献
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灵活可扩展的高性能无线传感器网络硬件是支撑科学研究与工程实践必不可少的基础平台.以高性能低功耗的STM32微控制器和高灵敏度CC2520无线收发器为核心芯片,设计开发了基于Cortex内核的新一代32位传感器网络开源硬件平台OpenWSN节点,并提供了符合通用模块互联总线规范的外扩接口,以方便与各种传感器和外扩功能板连接.在开源OpenWSN软件的支持下可快速构建传感网研究与应用平台.该设计遵循低功耗、高扩展、高可靠、低成本和微型化原则,实测表明具有良好的传输性能和低功耗特性,为进一步开展同步振动测量等高性能传感网应用奠定了良好基础. 相似文献
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A distributed diagnosis system combining Immune Network (IN) and Learning Vector Quantization (LVQ) for detecting fault sensors accurately in industrial plants is proposed. It has two execution modes, namely, its training mode where LVQ extracts correlation between each two sensors from their outputs when they work properly, and its diagnosis mode, where LVQ contributes to testing each two sensors using the extracted correlation, while IN contributes to determining fault sensors by integrating these local testing results obtained from LVQ. Discussed here is how to improve diagnosis capability of the developed system. It is shown that the thresholds can be determined effectively by the constraint that the hyperregion corresponding to the normal sensor outputs in each quantization vector space is a single region. Diagnosis capability of the developed system is evaluated using a prototype system for detecting fault sensors of a reheating furnace plant. With the proposed method, abnormal sensors, such as aged deteriorated ones, which have been difficult to be detected only by checking each output of sensor independently, are possible to be specified. 相似文献
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随着电力系统在现代社会发展中的地位不断提高,其面临的各种危险也越来越引起人们的高度关注.为探究电力系统鲁棒性,建立了考虑电力系统实际运行机理的网络化模型.基于复杂网络理论,按照方法论原则,提出了一种鲁棒性分析方法.分别从结构和功能上给出了电力系统的鲁棒性分析指标,并模拟了电力系统三种故障情形.运用IEEE30测试网络,... 相似文献