地铁时钟系统故障问题分析及建议

伴随着国内基础建设进程的持续性推进,地铁工程得到迅猛发展。通信时钟系统是城市地铁弱电系统的重要组成子系统之一,对轨道交通的正常运营提供了基本保障。在投入运营后,受多种因素影响,时钟系统可能会出现不同的故障,对地铁正常运营有着较大的不良影响。对此,本文探讨了地铁时钟系统的系统构成以及常见故障问题,针对问题提出了具有针对性的应对措施及建议。     

地铁机电设备的安装及维修管理工作要点研究

我国机电设备发展迅速，工业生产已经到了机械化时代。地铁运行中存在许多安全隐患。加强地铁机电设备稳定运行管理，为地铁运营发展提供支撑和动力，可以在很大程度上解决城市拥堵问题。由于地铁运行速度更快，运营过程中没有拥堵，因此非常受社会公众欢迎。然而，地铁机电设备的安装和维护管理仍存在一些问题，不利于居民出行。本文简要分析了地铁机电安装维护管理的意义，重点分析了管理中存在的问题及其解决方案。希望能提供专业参考，提高整体管理水平。     

弱电控制系统管理及维护探讨

从加强弱电控制系统管理及维护的作用入手,重点分析了弱电控制系统在管理和维护方面存在的问题,提出了一系列加强弱电控制系统管理及维护的措施.     

医院弱电系统设计问题研究

医院弱电系统主要是在自动化控制技术应用的前提下,综合利用网络技术、现代信息技术,依据医院业务管理流程,构建完善的医院现代化管理体系。现以中南大学湘雅医院为例,介绍了医院内部弱电系统设计概况;并依据医院弱电系统设计原则,对医院弱电系统项目设计及后期维护管理进行了优化分析,以期为医院弱电系统稳定运行提供有效参考。     

地铁弱电用房全空气系统与多联机系统投资及运营费用简要分析

随着节能的要求越来越严格,作为地铁耗能大头的通风空调系统就如何节能提出了各种不同的方案,如提高设备的IPLV值、风系统设备变频运行、水系统设备变频运行等。现主要讨论作为地铁安全运行保障的弱电设备用房,如何能在充分保障机房稳定运行的情况下实现节能,节约投资及运营费用。     

杭州地铁自动售检票方式应用探讨

近年来,城市轨道交通作为缓解城市交通压力的一个重要途径,在国内备受重视且发展迅速。作为地铁配套设备的核心系统之一的自动售检票设备的设计研究将显得尤为重要。本文从乘客的角度出发,分析了杭州地铁乘客购票、检票过程中遇到的票种单一、互联网支付使用率低、检票效率低等问题。提出了相应的应对措施,为地铁客流组织及运营管理政策制定提供一定依据。     

基于地下工程的TETRA网络通信冗余机制设计与数据无线探测应用

随着城市中隧道和地下建筑的日益发展,我国地铁线路网路规模日益庞大,网络化运营和维护要求发展迅猛。为了满足地下信息通讯提出的地下网络设计与信息化动态反馈设计的要求,基于TETRA网络通信系统,提出了一种与地铁网络化发展相适应的高可靠性TETRA专用调度系统的冗余机制和无线探测应用,以保证地下工程可靠的建设、运行与维护。     

地铁综合监控系统KVM集中管控方案研究

主要研究地铁综合监控系统应用KVM对综合监控系统中的服务器、网络串口设备进行集中统一管控,同时实现相关设备的远程电源管控。研究的目的在于通过利用KVM设备,实现地铁综合监控系统的设备日常运维从现有的分散式巡检转变为集中式统一管理,达到日常运营减员增效的目的。     

基于综合监控系统数据的城市地铁3D运维平台应用研究

通过对综合监控系统(ISCS)与BIM技术相结合的研究及对福州地铁1号线综合监控系统数据进行转换处理,为3D运维平台提供数据支撑;初步实现了地铁运营数据的再利用,并应用于地铁运营管理;同时给地铁资产可视化管理、应急指挥决策提供了便利条件。     

深圳地铁三号线综合监控系统的特点

简单介绍深圳地铁三号线综合监控项目的内容,综合监控系统的意义,系统中群组监控、后备线控车站、集中维护的管理平台、分布式软件架构、模块化软件设计、联动等多种控制方式和多系统信息共享等特点,并根据项目特点及运营信息化需求,简述综合监控系统的发展趋势。     

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.