嵌入式以太网在工业测控系统中的应用

传统的现场总线由于标准不统一、传输速率低等局限性已经不能满足工业测控系统通信的要求,以太网技术凭借通用性强,技术成熟、带宽迅速增加等特性成为现场总线技术发展的新亮点。特别是随着嵌入式技术的出现,嵌入式以太网为工业测控系统提供了开放式、分布式、可互操作性的通信平台。     

CAN总线工业测控网络系统的设计与实现

本文采用控制器局部网（CAN）和分散型计算机控制技术,成功地研制了CAN总线工业测控网络系统。该系统由多个主节点和多个从节点组成,且很好地实现了CAN总线工业控制网络的数据通信和现场测控功能。主节点监督和管理所有从节点,从节点测量和控制生产过程参数。     

基金会高速现场总线FF-HSE分析与应用研究

工业自动化水平的提高导致信息量的成倍增加，由低速现场总线组成的控制层网络需要更高的带灾来传递各种实时信息。提高通讯速度和开放性一直是现场总线研究的重点。基金会现场总线HSE就是结合以太网技术制定出的高速、开放的现场总线标准。文中重点分析了HSE面向工业测控设计的通讯结构和特点，对HSE的冗余形式和灵活功能块等技术进行了探讨，并给出了具体应用实例。     

基于工业以太网EtherCAT的DCS控制系统设计

EtherCAT是一种新型的工业以太网现场总线技术,在工厂自动化和流程自动化领域得到了广泛应用.文章介绍EtherCAT现场总线的技术特点,设计了一套基于EtherCAT的DCS实例系统.该系统中主控制器单元和现场输入输出设备之间使用EtherCAT实现高速、大容量的数据通信,并使用标准以太网与中央控制器进行数据交换.     

新一代集成控制系统在煤粉混匀中的应用

主要介绍由工业以太网(Ether Net)和Control Net结合构成的新一代测控系统在煤粉混匀系统中的应用。系统上层网络为以太网,下层为现场总线Control Net网络。本系统在煤粉混匀系统中运行结果表明:该系统具有集成成本低、系统稳定性和可靠性高的特点。     

WAGO—I／O-SYSTEM助力实现透明工厂

PROFINET吸纳了工业以太网的技术诀窍,采用开放的IT标准,与以太网的TCP／IP标准兼容,并提供实时功能。它能与现有的现场总线系统（如PROFIBUS）有机集成,无需改动现有设备的组态和编程。通过工业以太网,连接从现场层到管理层的设备,可以实现从公司管理层到现场层的直接、透明的访问。     

先进的PROFINET总线标准是自动化系统应用的捷径

PROFINET由PROFIBUS国际组织（PROFIBUS International-PI）推出,是新一代基于工业以太网技术的自动化总线标准,PROFfNET为自动化通信领域提供了一个完整的解决方案,包括了诸如：实时以太网、运动控制、分布式自动化、故障安全以及网络安全等当前自动化领域的热点。作为跨供应商的技术,可以完全兼容工业以太网和现有的现场总线（如：PROFIBUS）技术,保护用户现有投资。它基于工业以太网标准,使用TCP／IP协议和IT标准,实现自动化技术与实时以太网技术的统一,     

现场总线与工业以太网的应用分析

对现场总线和工业以太网做了简单介绍。对其发展情况和技术特点做了详细分析,认为现场总线多标准的出现是历史发展的必然,工业以太网不会也不可能取代现场总线。结论:现场总线与工业以太网相结合将是未来自动化网络的发展趋势。     

基于现场总线的电机运行状态分布式监测系统

针对宝钢1580热轧生产线辊道电机地理位置分布较分散,本文建立了一套基于RS485现场总线和工业以太网的电机运行状态分布式监测系统,详细介绍了系统的硬件网络结构、数据采集和工业以太网数据实时传输;实际运行表明系统数据采集速度快、抗干扰能力强,满足了生产现场的实际需要。     

工业以太网接口及其实现研究

工业以太网克服了现场总线存在的成本高、通信速度低、支持应用有限以及不同总线产品不能相互连通、共用等缺陷,取代了现场总线,应用到工业控制领域中。现简要介绍了目前比较流行的几种工业以太网,针对这些工业以太网提出了3种实现方案,并对这3种方案的适用领域进行了简单比较:带Ethernet控制器的嵌入式处理器芯片适用于一般的中小型工业以太网系统;专用芯片适用于开发周期短、时间要求高的工业以太网;FPGA灵活性非常好,在工业以太网领域适用范围广泛。     

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.     

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....     

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。     

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.