基于Internet的嵌入式设备状态监测系统开发与研究

网络化的设备状态监测及故障诊断是企业设备状态监测的发展方向。本文介绍了一种基于Internet的嵌入式设备状态监测与故障诊断系统，利用嵌入式动态信号测试分析仪进行现场数据采集，通过Internet上传至服务器，实现了设备数据的集中化管理，专家通过网络可以对设备状态进行远程监控，并且服务器可以对客户端的连接进行在线监控，增强了系统的规范化管理和安全性。     

矿井大型设备远程监测及性能测定系统探究

在对矿井大型设备监测现状进行深入调查,对故障机理及故障分类深入研究的基础上,结合传感与测量技术、数字信号处理技术、系统控制理论、人工智能故障诊断等现代科学技术,确定了矿井大型设备远程监测预警系统的监测监控预警模型,系统采用基于工业以太网的环形网络结构,建立了完整的数据采集系统,将矿井大型设备的运行状态参数集中采集,通过网络传输至监测预警中心,实现了矿井大型设备运行的远程实时状态监测。     

基于云平台的远程机泵监控诊断系统设计与实现

为了提升机泵运行的安全性、可靠性,研究了基于云平台和运行大数据的设备健康状态监测诊断模式,设计了远程在线监测与智能诊断系统,实现了集在线监测、远程监控、远程诊断、故障匹配识别于一体的智能高效监测诊断模式。实际应用表明,该系统实现了远程监控的目的,能够较好地接收和传输状态信息数据,可以满足远程实时监控的需求,并为后续进行设备故障诊断和分析提供依据。     

基于PLC的远程设备故障诊断方法研究

随着计算机技术的不断升级和发展,设备制造企业对于PLC的远程设备故障诊断方法要求也越来越高。近年来,PLC发展极为迅速,也被广泛运用到各类产品中,是集远程监测、控制、诊断等通信技术为一体的通用工业控制装置。计算机网络技术的发展使基于PLC的远程设备故障诊断成为可能,并改变了传统设备监控、故障诊断方法,通过网络将各类数据传递给远程专家系统,实现了通过网络监控设备的运行状态、故障发生情况。本文将简单介绍基于PLC的远程设备故障诊断方法,长期为大型设备的远程故障诊断技术提供参考。     

基于CAN总线的制造业远程监测仪器系统

为了实现制造业的网络协同监控服务,以旋转机电系统为测控对象,采用CAN现场总线技术和网络技术构建了集实时测量、控制和现场监视功能于一体的远程网络监控仪器系统。该仪器系统能对反映现场工作状态的特征信号进行监测,通过人工智能软件对现场状态进行分析,诊断,使用灵活,易于联网,可广泛应用于工业领域。     

基于Internet的设备远程监控与故障诊断

随着Internet技术的不断发展,设备远程监控与故障诊断成为故障诊断技术发展的必然趋势。本文分析了设备远程监控与故障诊断的结构及工作模式,介绍一种基于Internet的设备远程监控与故障诊断系统,该系统利用现代计算机网络、通讯及自动控制等多项技术,将现场数据采集与处理,实时监控与决策等环节有机的结合,并利用专家系统中的知识库和远程诊断专家对设备故障做出诊断,提高设备故障诊断的可靠性和智能化水平,实现监测,控制与诊断的一体化。     

网络远程控制系统关键技术设计

本文通过基于因特网技术的人机交互式远程监控技术.设计了一个网络远程控制和访问系统,辅助网络管理者更加高效地实施网络的监管.该系统是通过数据库技术及SoCket技术实施网络远程的控制和访问,能够有效地远程监控管理网络环境里的路由器与交换机等设备,同时可以远程传输与访问监测分析数据.通过使用该系统,网络监管者能够及时地采取措施,对网络监测结果实施实时地查询与处理,隔离控制网络中异常数据流量,以确保网络运行的安全性.     

冲压生产线冷却水循环控制系统设计

实现某汽车公司冲压生产线冷却水循环系统的控制系统设计。以西门子S7-300PLC作为控制器,将控制系统分为主站和从站,应用PROFIBUS-DP网络进行通信。选择西门子Win CC作为HMI组态软件,应用工业以太网络与PLC主站通信,实现上位监控系统设计。该控制系统不仅实现远程自动运行,参数修改和报警等功能,还可以在设备故障时通过远程上位手动对需要的设备进行启停控制,或轻松进入就地手动控制,提高了生产效率,增加系统安全性能,方便故障诊断与维护。     

基于MCGS的矿用主通风机在线监测与控制系统

监控系统在MCGS的环境下,使用高可靠性的工控PLC设计实现通风机运行状态的在线监测及控制;通过与中央控制室工业控制计算机联网,实现了通风机在正常工作、反风工作、正常倒换通风机以及工作通风机在故障状态下的倒机工作的远程监视和自动化控制,从而达到了通风机设备现场无人值守的状态.     

数控设备的开放式远程监控系统研究

设计了一种基于Web技术的开放式数控设备远程监控系统,介绍了远程监控系统的总体框架和工作原理,并分析了监控系统实现的关键技术,实现了各种异构数控设备开放式的远程监控,改善了传统的监控方式。用户可以通过Web浏览器不仅可以对分布于各地的数控设备等实时监视和控制来自设备数控系统的各种信息,还可以对设备进行远程管理和远程故障诊断,大大提高了生产率和自动化程度。系统具有数据传输可靠、集成度高、应用范围广等特点。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.