共查询到20条相似文献,搜索用时 156 毫秒
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为了实现远程监测诊断,在TCP/IP协议下,利用有效的网络资源,ASP和socket技术,采用易于扩展的客户/服务器结构模型来设计系统,并在Internet和Windows环境下,实现远程电网监测诊断系统。 相似文献
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基于B/S结构的远程故障诊断系统的研究 总被引:2,自引:6,他引:2
分析了基于Internet的远程故障诊断系统的可行性,优越性.介绍了诊断系统的Browser/Server体系结构,简述了远程故障诊断的系统框架和主要功能模块,同时指出了诊断系统的自学能力特点.系统自我完善、自我更新的智能化功能。 相似文献
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基于C/S模式的远程虚拟仪器测控系统及其实现 总被引:4,自引:0,他引:4
基于客户/服务器C/S模式的远程虚拟仪器系统是在现有基础上将虚拟仪器技术与客户/服务器技术相结合,构造出一种灵活的测控系统结构。论述了C/S模式测控系统原理及结构,并结合实例进行了讨论。 相似文献
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快速构建基于Web的远程测控系统 总被引:10,自引:0,他引:10
文章分析了测控领域中两种类型的远程测控系统,论述了利用虚拟仪器和Internet技术快速构建基于Web的远程测控系统的方法。利用该方法构建了基于Web的远程在线监测诊断系统,并深入讨论了减少网路流量的途径。 相似文献
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基于虚拟仪器的电能质量网络监测系统是把网络技术与虚拟仪器相结合,构成的网络虚拟仪器系统,本文介绍了系统的网络结构,虚拟仪器的总体设计,论述了部分电能质量参数监测的软件设计,最后论述了实现远程监测的方法。 相似文献
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Identification of coexistent load and damage 总被引:2,自引:1,他引:1
Qingxia Zhang Łukasz Jankowski Zhongdong Duan 《Structural and Multidisciplinary Optimization》2010,41(2):243-253
Load reconstruction and damage identification are crucial problems in structural health monitoring. However, it seems there
is not much investigation on identification of coexistent load and damage, although in practice they usually exist together.
This paper presents a methodology to solve this problem based on the Virtual Distortion Method. A damaged structure is modeled
by an equivalent intact structure subjected to the same loads and to virtual distortions which model the damages. The measured
structural response is used to identify the loads, the distortions and to recover the stress-strain relationship of the damaged
elements. This way both the damage type and extent are identified. The approach can be used off-line and online by repetitive
applications in a moving time window. A numerical experiment of a truss with 5% measurement error validates that the two tested
damage types (constant stiffness reduction and breathing crack) can be identified along with the loads. 相似文献
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Hysteresis loop analysis (HLA) has proven an effective indicator of damage detection in civil engineering structural health monitoring (SHM). In this paper, the histogram of stiffness (HOS) features are extracted from segregated half cycles of hysteresis loops reconstructed from measured response. A deep learning network (DLN) is proposed with the use of the HOS to classify the damage index (DI) based on stiffness degradation for damage identification. Training data are obtained using numerical simulations of 30,000 realistic, randomly created hysteresis loops, including a wide range of typical linear and nonlinear structural behaviours. Performance of the trained DLN model is assessed using both 1800 additional simulated 3-story “virtual” buildings and experimental data from a 3-story full-scale real building. Results are compared to the validated HLA method.Validation on simulated virtual building data yields prediction accuracy for 97.2% and 91.6% samples without and with 10% added noise, respectively. The comparison shows a good match of trend and percentage stiffness drop between DLN and HLA identification with the average difference for all cases within 1.1–4.6%, indicating a good accuracy of the proposed DLN prediction model for real structures. The overall results show its potential to provide a rapid, and real-time alarm or other notice on damage states and mitigation to emergency response using DLN and thus without detailed engineering analysis. 相似文献
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Structural damage identification by adding virtual masses 总被引:1,自引:0,他引:1
Jilin Hou Łukasz Jankowski Jinping Ou 《Structural and Multidisciplinary Optimization》2013,48(1):59-72
This paper presents a method for damage identification by adding virtual masses to the structure in order to increase its sensitivity to local damages. The main concept is based on the Virtual Distortion Method (VDM), which is a fast structural reanalysis method that employs virtual distortions or pseudo loads to simulate structural modifications. In this paper, the structure with an added virtual mass is called the virtual structure. First, the acceleration frequency response of the virtual structure is constructed numerically by the VDM using local dynamic data measured only by a single excitation sensor and a single acceleration sensor. Second, the value of the additional mass is determined via sensitivity analysis of the constructed frequency responses of the virtual structure with respect to damage parameters; only the natural frequencies with high sensitivity are selected. This process is repeated for all the considered placements of the virtual mass. At last, the selected natural frequencies of all the virtual structures are used together for damage identification of the real structure. A finite element (FE) model of a plane frame is used to introduce and verify the proposed method. The damage can be identified precisely and effectively even under simulated 5 % Gaussian noise pollution. 相似文献
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飞机结构损伤监测技术是确保其结构完整性、可靠性和安全性的关键技术。为了实现飞机大面积曲面结构的主动损伤监测,利用柔韧性良好的0-3型压电涂层复合材料和Lamb波传播距离远及对细微缺陷的高敏感性,基于CRIO(Compact RIO)平台和LabVIEW环境设计了结构损伤监测的软硬件系统。系统由激励探头、压电涂层传感器阵列、CRIO数据采集平台、WiFi无线传输网络、监测中心上位机及软件等部分组成,研制的压电涂层传感器能够较好地贴合于机翼等曲面结构,应用CRIO技术实现了测试设备的可重复配置与快速测试,无线数据传输能够克服大量传感器布置带来的布线复杂问题。将该系统应用于曲面铝板损伤监测模拟实验,验证了该系统测试信号的有效性和损伤定位结果的准确性。 相似文献
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基于LabVIEW 8.0的C/S、B/S两种网络通信模式,构建网络化学虚拟仪器系统,以C/S模式实现远程实时监控多个以常规带串行口的WZZ-2B旋光仪、精密数字温差仪组建的现场测试虚拟仪器;以B/S模式,在Web中实现远程实时动态操控测试现场电导率虚拟仪器。应用结果表明:应用LabVIEW 8.0的C/S和B/S模式,可快捷构建用于不同测试目的远程监控的网络化学虚拟仪器,实现远程共享的化学虚拟仪器。 相似文献
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It is proposed in this paper a novel two-stage structural damage detection approach using fuzzy neural networks (FNNs) and data fusion techniques. The method is used for structural health monitoring and damage detection, particularly for cases where the measurement data is enormous and with uncertainties. In the first stage of structural damage detection, structural modal parameters derived from structural vibration responses are fed into an FNN as the input. The output values from the FNN are defuzzified to produce a rough structural damage assessment. Later, in the second stage, the values output from three different FNN models are input directly to the data fusion center where fusion computation is performed. The final fusion decision is made by filtering the result with a threshold function, hence a refined structural damage assessment of superior reliability. The proposed approach has been applied to a 7-degree of freedom building model for structural damage detection, and proves to be feasible, efficient and satisfactory. Furthermore, the simulation result also shows that the identification accuracy can be boosted with the proposed approach instead of FNN models alone. 相似文献
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《Journal of Network and Computer Applications》2010,33(6):633-645
This paper presents an agent-based artificial immune system approach for adaptive damage detection in distributed monitoring networks. The presented approach establishes a new monitoring paradigm by embodying desirable immune attributes, such as adaptation, immune pattern recognition, and self-organization, into monitoring networks. In the artificial immune system-based paradigm, a group of autonomous mobile monitoring agents mimic immune cells (such as B-cells) in the natural immune system, interact locally with monitoring environment, and respond to emerging problems through simulated immune responses. The presented immune-inspired monitoring paradigm has been applied to structural health monitoring. The “antibody” of a mobile monitoring agent is a pattern recognition algorithm tuned to a certain type of structural damage pattern. The mobile monitoring agent performs damage diagnosis based on structural dynamic response data. Mobile monitoring agents communicate with each other and collaborate with network components based on agent interaction protocols defined in agent standards, the Foundation for Intelligent Physical Agents standards. A mobile agent system embedded in sensor nodes supports the selective generation, migration, communication, and management of mobile monitoring agents automatically. The active structural health monitoring is achieved by distributing mobile monitoring agents to the sites where they are needed. The structural damage diagnosis using mobile monitoring agents and artificial immune pattern recognition method has been tested using a scaled steel bridge structure. The test result shows the feasibility of using this approach for real-time structural damage diagnosis. 相似文献