基于Web技术的远程监控系统研究

在明确远程监控系统概念基础上,分析了基于Web技术的远程监控系统在工业控制领域应用前景.阐述了交互式Web技术和三维虚拟Web技术的实现机制,举例说明了以太网上基于Web技术的远程监控系统实现方案,最后对基于Web技术远程监控技术在工控领域应用提出了展望.     

基于OPC和Web的水质在线监测系统的设计

结合我国水质监测工作的现状,提出了一种基于OPC和Web的水质在线监测系统的设计方案,并对OPC和ActiveX技术的应用进行了探讨.OPC技术可以实现现场设备和软件的无缝集成,使得基于Web的远程水质在线监测成为了可能.     

基于Web和现场总线的远程监控系统的设计与实现

阐述了基于Web和现场总线的远程监控系统的结构设计与实现.它集下位智能节点控制、上位基于B/S结构的网际组态软件WebAccess远程监控为一体,具有组态界面友好、运行实时可靠等优点.在讨论系统体系结构、技术方案、网络安全的基础上,设计并实现了基于Web的远程监控系统.     

基于Web的嵌入式远程监控系统

为解决传统监控模式受时间和地点限制的问题,提出了基于Web与嵌入式系统的远程监控模型及其解决方案。以步进电机为远程监控对象,利用UART总线技术与Web技术进行远程通信,通过片上系统（SoC）微处理器控制硬件接口,采用嵌入式系统主控片上系统的运行,将Web技术与嵌人式技术相结合,研制完成了一个完整的远程监控系统。实验结果表明,该系统可对无人值守的现场设备实现随时随地的远程监控。     

大型光电望远镜的实时远程监控系统开发

通过Internet与GSM网络实现对大型光电望远镜实时的远程监控。设计了一种基于ARM-Linux的嵌入式远程监控系统,系统内置Boa Web服务器,采用CGI技术,通过对GPIO驱动编程、Internet网络编程和串口通信编程及收发短信息编程的开发,用Web浏览器或手机短信形式实现对大型光电望远镜所在现场环境信息的实时监测及对现场相关设备开关量的监控。系统性能稳定可靠、实时性好。     

基于Web的单晶生长炉远程监控系统

为实现对单晶生长炉的远程大范围的监控,改进了原有单机串口通信的监控方式,采用了新型串口服务器组网方式,结合PLC通信技术和Web技术,设计了一种基于Web的远程监控系统,具体介绍了系统的组网方式、程序设计和主要功能。试验结果表明,该系统运行稳定可靠,能同时为多用户提供单晶炉远程监控服务。     

短信型农村泵站远程监控系统的设计

介绍一种利用单片机及MC35i短信模块构成的农村泵站远程监控系统,主要完成农村泵站远程开关控制、运行参数监测、现场设备防盗和自动计费等功能.重点阐述泵站远程监控系统的基本组成、软硬件设计以及手机短信监控的实现等内容.     

基于Web Service的温室远程监控系统设计

根据温室特点和Web Service技术原理,提出了基于Web Service技术的3层温室远程控制系统架构.采用.Net开发Web Service组件,利用JSP直接调用Web Service控制接口,开发了对温室进行远程手动控制的Web页面.结合J2EE开发Web服务器程序和基于Web模式的客户端程序,实现了温室的远程登录、参数查询和动态曲线显示等功能.温室远程监控系统已在实验温室和校园网内得到应用,结果表明其各项功能运行正常,系统稳定可靠.     

基于GPRS的水质参数无线监测系统设计

针对传统水质监测存在的监测频次低、采样误差大、监测数据分散等问题,提出基于GPRS的水质参数远程监测系统设计方案,研究了GPRS的通信原理,采用基于ARM的S3C2440A芯片为核心设计的硬件电路,利用传感器进行水质各参数的实时数据采集,通过公网无线数据通道为传输手段,构建了监控管理信息平台.测试表明,该系统可实现对水质参数的无线实时监测和数据分析,且对其他无线测控系统具有良好的可扩展性.     

基于ZigBee的水质监测无线传感器网络节点

设计了基于ZigBee的水质监测无线传感器网络系统。采用CC2430作为节点主控芯片,利用Z-Stack协议栈进行软件开发,系统自动采集发送水质数据,并实现了与监控终端之间的通信。试验结果表明:系统能够实时性监测目标水域的水质数据,简单便捷,成本更低。当需要检测的地点比较多时,使用ZigBee技术的优势可以更明显,为广大水域的水质自动监测提供了有效的方法和手段。     

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.