炼厂DCS报警系统的应用与优化

阐述DCS报警系统的重要性,论述装置报警的分析处理过程和方法,结合现状提出DCS报警系统的缺陷和可改进方面。     

大型电子洁净工厂弱电系统设计简述

结合液晶面板工厂、集成电路芯片工厂工程实例,简述大型电子洁净工厂弱电系统的设计方案及工程做法,包含电话/网络系统和安防系统(门禁、考勤、一卡通系统,闭路电视监控系统,巡更系统,入侵报警系统,周界报警系统,残疾人报警系统等)。     

FANUC CNC故障诊断报警系统及快捷中文信息输入

阐述了FANUC报警系统的分类、结构、编辑方法和技巧，重点介绍外部报警的编辑方法和技巧，并结合研究发现的制作中文报警信息的快捷方法，解决了FANUC系统编辑中文报警盲目、繁琐的查找过程，有助于设计人员制作出更加专业、更加完善的CNC报警系统。     

基于单片机的无线智能报警系统的设计

为了解决目前无线报警系统存在的误报警、成本高等问题,结合无线报警和ZigBee技术,采用CC2530芯片和HC-SR501人体感应模块,实现了基于ZigBee技术无线智能报警系统的硬件设计和软件开发。     

三门核电项目火灾探测器误报警分析

以三门核电一期工程火灾报警系统中火灾探测器的误报警为研究对象,结合其工作原理及火灾报警系统调试维护经验,对火灾探测器误报警原因进行了分析,提出了减少误报警次数的应对策略。实践表明,采取措施后火灾探测器误报警次数大大减少。     

尺寸数据报警的创新设计

基于传统的尺寸统计报警理论经验,对报警监控的对象、监控的算法及报警的后续发展做了创新拓展探索。结合当前开发的IT报警系统的功能应用,分享一些设计思路和核心算法,为相关行业数据报警技术的应用提供参考。     

石油化工企业火灾自动报警系统设计

本文结合石油化工企业消防安全管理的需求,说明石油化工企业的火灾自动报警系统应采用对等式功能结构。分析在工程设计中如何保证火灾自动报警系统可靠性,通过火灾电话报警系统和消防专用电话系统的功能对比,得出石油化工企业更适合采用火灾电话报警系统的结论。     

气象探测网运行监控短信报警阈值与报警机制设计

文章介绍了新一代天气雷达、闪电定位系统、GPS/MAT探测系统等大型系统设备运行保障中的监控报警阈值设计,结合业务实际制订科学的报警机制,通过短信发布平台实现自动手机短信报警,以使故障报警信息能及时得以发现并处理。     

城市监控报警系统网络设备的测量评估方法

城市监控报警系统是通过硬件和软件两方面的结合搭建一个科技与业务相融合的平台,形成互联互通的监控报警网络.这里提出一种关于城市监控报警系统网络设备的测量和评估方法,通过全面、科学地测量和分析,可对系统相关性能进行评估、判定系统性能的优劣和直接指导城市监控报警系统的建设,并为今后国家标准或规范的制订打下基础.     

秦山一期报警系统数字化改造设计和实施

介绍了秦山一期核电厂报警系统改造前的现状以及存在的设备老化、备件停产以及抗震性能不足等问题,并阐述了报警系统改造的必要性;同时从设备布置、电缆敷设和供电负荷等方面分析数字化改造的可行性;结合数字化报警系统的功能和特性要求,提出了系统改造范围、改造原则、设计方案,并介绍了报警系统在供电方式、信号接口、抗震能力、报警连锁操作等关键功能的设计和实施改进,最后比较了改造前后系统在可靠性、稳定性和灵活性方面的差异。     

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.     

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....     

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。     

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.