基于PLC的油田联合站数据采集与控制系统

联合站是油田原油与天然气集输生产中极为重要的工艺过程之一。为了对联合站实施安全、平稳、高效的控制,二连阿尔油田联合站设计了一种基于可编程逻辑控制器(PLC)、现场监测仪表、监控组态软件Wonderware平台的监控系统。系统实现了对工艺参数的数据采集和控制、历史数据的保存,提高了联合站的自动控制和管理水平。     

联合站自控系统设计与应用

针对油田联合站的生产流程及控制要求,着重介绍了联合站自控系统的方案设计、硬件配置、程序设计、监控画面设计及系统通信功能的实现。     

Zigbee技术无线传感器网络在天然气联合站中的应用

通过分析现有天然气联合站监控系统存在的问题,引入了基于Zigbee技术的无线传感器网络,并将其应用于天然气管道各项指标的测量,具有功耗低、成本低、系统维护简单的特点。简要描述了系统组成和节点的硬件实现。     

基于PROFIBUS-DP的溢流染色机控制系统

介绍了PROFIBUS--DP现场总线在溢流染色机控制系统中的应用,采用现场总线技术与PLC技术。实现了对系统各设备的数据采集、处理及监控等功能。主站和从站能够独立运行,减少了人为因素对染色工艺的影响,大大提高了系统的智能化、自动化程度,且提高了生产效率和产品质量。     

基于OMRON CLK技术液晶面板生产设备监控系统

为满足现代企业信息化技术的要求,在简要介绍数据采集与监视控制系统(SCADA)的原理基础上,结合液晶面板生产设备的具体特点,提出了基于欧姆龙可编程控制器及其工厂自动化技术的液晶面板组装工艺生产设备远程监控系统。具体介绍了系统的组网方式、主站与子站通讯技术方案、硬件选型、软件设计实现及主要功能。研究结果表明,液晶面板生产设备监控系统可以实时、稳定、可靠地运行,可以满足生产现场监控需求及企业信息化建设的需要。     

基于Modbus现场总线的热力站监控系统

概述了基于Mo(1bus现场总线的热力站监控系统的整体架构,介绍了总线控制器和Modbus现场总线的技术.特点,并分主站和从站阐述了热力站监控系统的实现过程.热力站监控系统运用Modbus现场总线接口,建立现场总线控制器和组态软件的通讯连接,最终实现热力站数据的实时监测和远程控制.     

海南省自动气象站监控系统建设

本文以海南省为例,通过.NET和GIS技术建立海南省自动气象站监控系统,对各市县气象局遥测自动站、区域自动气象站、海岛自动站等各类观测资料进行实时监控,并为故障站点发送报障短信,实现了市县局—省气象信息中心—国家局的数据传输全程监控,为自动站数据传输提供高保障性。     

基于PLC的分布式综合站房监控系统

介绍了基于OMRON C200Hα和工控组态软件组态王的一种分布式监控系统及其在综合站房－－制冷站、热交换站、循环水站监控系统中的应用。详细阐述了该系统的硬件结构及软件组成以及PLC的具体配置，该系统的具体通信方式及下位机软件的编程思想及方框流程。还介绍了综合站房的先进控制工艺要求及恒压供水的一种简单实现方法。该系统已投入运行，取得良好的应用效果。     

二次沉淀罐的自动化改造

针对联合站二次沉淀罐自动化系统改造,重点叙述硬件配置和控制系统设计。以AB系列PLC为下位机,PC为上位机,通过OPC技术和组态王网络设置实现数据和信息的交换对二次沉淀罐多点实时控制和监控。     

多台压滤机的DP组网系统设计

设计了多台压滤机DP网络系统以实现远程控制和监控,阐述了其组成,介绍了从站PLC系统的组态、主站PLC系统的组态、上位机变量的采集和数据的传送、压滤机工艺中WINCC画面的组态。     

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.