浅谈工程建设项目过程控制的重要性

工程建设项目过程控制在一定程度上直接决定了工程建设整体质量,本文以工程建设项目过程控制的重要性为讨论方向,客观阐述了工程建筑项目过程控制的重要性,继而从工程造价的全过程控制、施工准备阶段过程控制、施工阶段的过程控制三个方面揭示了工程建设项目过程控制的具体措施.     

专家系统与工艺过程控制一体化

论述了专家系统、模糊逻辑与过程控制的一体化技术。分析了一体化结构的工作模式:分级递阶智能控制结构和一体化的通讯接口;寓于分布式过程控制系统的嵌入式专家系统和泛布尔模糊推理专家控制系统。专家系统引入过程控制和采用模糊逻辑是提高工业过程控制水平的一条途径。     

过程控制在工业生产中的应用

介绍过程控制作用以及实现过程控制的手段等。     

分布式微型机系统及其实例

1.分布式微型机系统在工业过程控制中的应用自从1959年,世界第一套工业过程控制计算机系统在美国一家炼油厂投入运行以来,计算机用于工业过程控制已有三十年的历史。随着计算机技术和微电子技术的飞速发展,计算机在工业过程控制中的应用越来越广泛。到目前为止,计算机用于工业过程控制的数字已无法确切统计,     

浅谈组态软件在过程控制中的应用

本文阐述了过程控制技术的发展和组态软件在过程控制中的应用及发展趋势.     

基于纵深防御理念的DCS信息安全方案在青岛炼化项目的应用

随着工业过程控制系统自动化、数字化、网络化程度的不断提高,工业过程控制系统所面临的信息安全威胁也日益严重。2010年“震网”病毒爆发,工业过程控制系统的信息安全得到了世人前所未有的关注。工业过程控制系统的信息安全关系到工业生产运行安全。本文介绍西门子公司基于纵深防御理念的DCS信息安全解决方案的总体概念和实施思路。     

基于Internet远程过程控制实验系统的设计

描述一个基于Internet的远程过程控制实验系统,能够实现过程控制实验装置中水箱液位控制的远程实验。实验人员可以利用连接在Internet网上的任意一台计算机远程操作实验装置;可以远程选择控制算法和调整控制算法的参数,进行远程过程控制实验。简述PID控制、模糊控制、模糊自适应整定PID控制等远程控制算法的实现过程。测试结果表明远程过程控制实验系统能够满足过程控制实验的需要,具有操作简单、实验过程显示直观等特点。     

霍尼韦尔任命NORMAN GILSDORF为过程控制部新任总裁

霍尼韦尔于2009年1月9日宣布任命Norman Gilsdorf（以下简称Gilsdorf）为其过程控制部新任总裁。Gilsdorf此前任霍尼韦尔过程控制部全球副总裁,欧洲、中东以及非洲区总经理。原霍尼韦尔过程控制部总裁Jack Bolick先生光荣退休,Jack Bolick先生在过去10年中一直供职于霍尼韦尔,其中6年担任霍尼韦尔过程控制部总裁职务。     

基于LabVIEW和摄像头的远程可视化过程控制

提出了将虚拟仪器技术应用于过程控制和以实时图像化方式监控过程控制系统的方案.以单容水箱液位过程控制系统为例.通过USB接口摄像头采集实时现场图像.利用LabVIEW平台开发液位测量、处理、现场图像采集与处理、远程传输、PID算法程序,实现了液位远程可视化监控.试验结果表明:工作人员不用身临现场,可以通过现场图像监控过程控制系统的运行情况,保证系统可靠运行.     

市场导航

Martin Muller先生霍尼韦尔过程控制部大中华区执行董事 Martin Muller先生现任霍尼韦尔过程控制部大中华区执行董事,负责管理包括中国大陆、台湾、澳门和香港在内的所有霍尼韦尔过程控制部大中华区业务。     

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.