Results 1 to 10 of about 3,302 (150)

Deterministic local multi-point fault detection method for industrial control topology [PDF]

open access: yes, 2021
In view of the fact that the existing network fault detection algorithms cannot meet the four requirements of determination of detection time, low detection overhead, multi-point fault detection ability and topology adaptability of industrial control ...
Hai WAN, Ruozhou LIANG, Xibin ZHAO
core   +1 more source

Fault tolerant GPS-AOA-SINS integrated navigation algorithm based on federated Kalman filter [PDF]

open access: yes, 2022
At present, global positioning system (GPS) was widely used in outdoor positioning.However, the continuous development of cities complicated the positioning environment, resulting in a sharp decline in positioning accuracy.Therefore, the integrated ...
Dapeng LI   +4 more
core   +1 more source

Fault detection and diagnosis method for heterogeneous wireless network based on GAN [PDF]

open access: yes, 2020
Aiming at the problem that in the process of network fault detection and diagnosis,how to train the precise fault diagnosis and detection model based on small data volume,a fault diagnosis and detection algorithm based on generative adversarial networks (
Peipei ZHANG, Xiaorong ZHU
core   +1 more source

International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder – Chinese (Mandarin) translation

open access: yesDevelopmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019
目的 本国际临床指南由欧洲残疾儿童学会(the European Academy of Childhood Disability,EACD)牵头制定,旨在解决发育性协调障碍(developmental coordination disorder,DCD)的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题,通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础,以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类,最终转化为指南建议。并由国际 ...
Jing Hua   +6 more
wiley   +1 more source

光伏直流配电故障诊断及火灾风险评估技术 [PDF]

open access: yes全球能源互联网
长期服役的光伏发电系统直流配电故障概率高、火灾风险及危害大,严重影响光伏电站的运行安全、发电与出力能力,并对电站运维提出故障与火灾精准检测的技术挑战。为此,从生产现场直流配电柜故障分析入手,揭示接触不良、绝缘劣化、故障电弧、电气火灾的演变机理;分析国内外故障电弧诊断与火灾检测技术的理论成果应对在运电站电弧火灾的有效性,提出故障电弧预诊断与火灾检测技术的应用解决方案。研究结果表明,提出的故障电弧诊断与火灾检测技术应用方案,弥补直流继电保护对串联电弧故障无法保护的不足,能够有效诊断故障电弧并检测烟雾和高温 ...
宋振宇   +6 more
doaj   +1 more source

低压直流系统故障电弧检测技术研究综述

open access: yesGaoya dianqi, 2023
随着系统容量日趋增大、电压等级逐渐提高,直流系统故障电弧威胁日益提升,新型源荷设备的接入更是增加了系统干扰的复杂程度,传统保护技术无法满足直流故障电弧及时准确的检测需求。文中从电弧仿真、特征构建、算法设计、硬件实现4个方面总结了直流故障电弧检测技术的研究进展,讨论了不同电弧仿真模型的缺陷,分析了复合电弧模型的针对性改进;论述了基于物理、电磁、电气信号的特征构建方法,对比了不同时频检测特征优势;并从故障电弧特征融合的角度,基于树莓派平台比较了机器学习算法与阈值比较算法的检测应用效果 ...
汪倩   +4 more
doaj  

基于绝缘子内置电容分压的配电线路故障检测技术研究

open access: yesDianci bileiqi, 2023
短路故障和断线故障是配电网常见的线路故障,对配电网安全稳定运行有重要影响。本研究以不接地配电系统为对象,提出在线路绝缘子内部集成陶瓷电容,通过电容分压检测配电网线路故障的暂态电压信号,进而实现配电线路故障检测的新方法。采用PSCAD/EMTDC软件建立了短路故障和断线故障情况下配电系统的仿真模型,研究了典型故障工况下绝缘子内置电容分压器监测的线路电压特征。结果表明:对于低阻和中阻接地故障,线路故障相电压迅速减小至稳定值,健全线路对应相的电压欠阻尼振荡衰减至稳定值,故障线路与健全线路的暂态高频信号特征明显;
黄继盛, 刘红文, 唐钊, 张春丽
doaj  

Proactive Fault Detection and Diagnosis Method for VAV Terminals in Air Conditioning System [PDF]

open access: yes, 2019
A variable air volume(VAV)system exhibits the feature of limited sensors and similar characteristics of fault conditions. A traditional passive fault detection and diagnosis(FDD)method does not diagnose all faults in VAV systems due to limited ...
Fan Yubin   +4 more
core   +1 more source

基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法研究 [PDF]

open access: yes全球能源互联网
为实现更强的能量耗散能力,混合式高压直流断路器的耗能支路需串并联大量金属氧化物压敏电阻(metal oxide varistor,MOV),耗能支路的可靠性将直接影响混合式高压直流断路器的可靠性。但是,现有的耗能支路故障检测方法并不能适应整个能量耗散阶段。为此,提出一种基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法,具体为:首先是信号预处理,对耗能支路每个子模块的分支电流进行归一化和一阶差分计算来获取分析电流;然后是故障特征提取,利用经验傅里叶分解(empirical Fourier ...
彭兆伟   +5 more
doaj   +1 more source

基于振动特征估计的GIS设备故障检测与分析

open access: yesGaoya dianqi, 2020
针对气体绝缘金属全封闭开关设备(gas insulated switchgear,GIS)故障频发问题,提出一种基于振动特征估计的GIS设备故障检测与分析方法;首先,提取GIS设备金属外壳振动信号特征并基于通用自回归模型建立系统的状态空间模型;然后,采用粒子滤波算法对GIS设备振动特征进行估计。同时,将特征估计值与实际测量值之间残差的绝对值作为设备故障检测指标,结合自适应阈值方法来检测故障;最后,依据振动特征残差的变化趋势实现机械故障与放电故障的隔离。对多组变电站现场GIS设备不同故障前 ...
赵洪山, 高玉峰
doaj  

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