基于IEEE1451.2协议的变送器接口TII设计与实现

IEEE1451.2标准定义了智能变送器接口模块STIM和网络适配处理器NCAP之间的TII接口协议,使传感器具有了即插即用功能,文中主要完成了TII的设计.分析了变送器独立接口TII模块的定义和工作原理;进行了变送器独立接口TII硬件电路设计,并给出了工作模式;进行了接口的时序测量.研究表明:设计的变送器独立接口TII,在时序等性能上符合IEEE1451.2标准,可应用于IEEE1451.2的网络化传感器研究.     

基于IEEE1451.2协议的变送器接口TⅡ设计与实现

IEEE1451.2标准定义了智能变送器接口模块STIM和网络适配处理器NCAP之间的TⅡ接口协议,使传感器具有了即插即用功能,文中主要完成了TⅡ的设计。分析了变送器独立接口TⅡ模块的定义和工作原理;进行了变送器独立接口TⅡ硬件电路设计,并给出了工作模式;进行了接口的时序测量。研究表明：设计的变送器独立接口TⅡ,在时序等性能上符合IEEE1451.2标准,可应用于IEEE1451.2的网络化传感器研究。     

智能传感器接口模块的设计与实现

IEEE1451.2标准为网络化智能传感器描述了传感器与网络适配器(NCAP)或微处理器之间的硬件和软件接口。智能传感器接口模块(STIM)包括传感器接口电路,信号调理和转换,标定,线性化,基本通信能力和电子数据表格。本文简介IEEE1451.2标准,主要阐述了智能传感器接口模块的硬件实现和软件设计方案。     

"即插即用"智能变送器模块的设计与实现

网络化智能化传感器的兴起使得测控网络的搭建效率提高,其关键是要解决传感器与现存各种总线网络之间互换性和互操作性的问题.在各种解决方案中,IEEE1451.2标准利用TII通用接口技术实现二者之间的连接,同时引入电子数据表格(TEDS)使得传感器具有一定的智能.文中对IEEE1451.2标准进行简要描述后,介绍了利用MSP430单片机实现智能变送器的硬件方案,并对TEDS的实现方式进行分析,最终利用LabVIEW编写了TEDS配置界面,实现了对智能变送器的参数配置.     

基于嵌入式Linux的TⅡ接口驱动设计

智能传感器网络技术是IT领域的一个研究热点.论文简要介绍了智能传感器网络中描述传感器与网络适配器之间硬件和软件接口的IEEE1451.2标准,并依据此标准,介绍了一种基于嵌入式Linux的通用TⅡ接口驱动的软件设计与实现方案.     

基于ADμC812单片机的智能传感器模块设计

为了解决网络化智能传感器接口互不兼容的难题,文中对IEEE1451.2协议进行了阐述,并采用片上系统ADμC812实现了遵守IEEE1451协议规范的智能传感器模块(STIM).这里重点介绍了STIM模块的软硬件设计思想及系统设计过程中相关注意事项.通过实践论证,ADμC812很好的实现智能传感器模块的功能,为IEEE1451标准智能传感器模块的研制提供了实例.     

智能网络传感器在钻井监控中的应用

为解决传感器与多种总线的相连问题,设计了基于IEEE 1451．2标准的智能网络传感器．该传感器包括智能变送器接口模块、网络应用处理器与变送器标准接口三个部分,智能网络传感器解决了与多种总线相连问题,能实现传感器即插即用,便于系统以后更新与升级．     

IEEE1451智能传感器接口标准研究

对IEEE1451标准中的智能传感器功能模型和信息模型进行了具体分析,并且结合网络化智能传感器通用开发平台的设计实现的体验,对IEEE1451的设计思想做出评价.IEEE1451标准成功之处是对变送器电子数据表TEDS的设计,较好地解决了传感器自动校正的问题.IEEE1451智能传感器信息模型是一个通用模型,但在实现上有一定难度,缺乏功能相对简单的模型子集.另外,IEEE1451标准把智能传感器划分为STIM和NCAP两个模块,必要性不强.最后讨论了智能传感器标准的未来发展.     

网络化智能传感器/执行器的设计及接口标准IEEEl451.2

文中介绍了国际电器电子工程师协会IEEE组织针对智能网络化变送器(传感器／执行器)而制定的接口标准IEEEl451产生的背景、历史和优越性,介绍了兼容各种现场总线标准的智能网络化传感器系统的组成。特别是针对其中的mEEl451．2部分做了较为详细的叙述,对其规定的技术特征数字接口、变送器模型、TEDS内容、STIM的典型结构以及传感器校准方法模型等分别作了介绍,并给出典型的网络应用结构。     

基于IEEE1451.2标准设计数字式智能压力变送器

为简化传统设计中复杂的变送器与网络通讯的问题，IEEE1451．2标准将变送器与微处理器以及微处理器与网络之间的接口标准化，使变送器模块达到即插即用的功能。介绍了IEEE1451．2标准，描述了基于该标准的DX数字式智能压力变送器的接口设计和功能实现。     

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.