电梯远程监控方法研究

为能够及时发现电梯故障、及时报警并找到故障源,设计了电梯远程监控系统。通过分析电梯远程监控系统的结构及软、硬件功能的实现,阐述了电梯远程监控系统的诸多优点,最后结合工作实际,展现了电梯远程监控系统在安全方面的价值。     

电梯远程监控系统中快速响应系统研究

讨论了电梯远程监控系统的一般组成及控制原理。把远程视频监控的功能集成到电梯的远程监控系统中，从预诊断到故障排除过程中贯穿快速响应思想，探讨了电梯远程监控系统的快速响应机制。在基于CAN总线电梯控制系统上开发了电梯远程监控系统，并进行了实验。     

电梯远程监控方法研究

为能够及时发现电梯故障、及时报警并找到故障源,设计了电梯远程监控系统。通过分析电梯远程监控系统的结构及软、硬件功能的实现,阐述了电梯远程监控系统的诸多优点,最后结合工作实际,展现了电梯远程监控系统在安全方面的价值。     

视频监控在电梯远程监控管理系统中的实现

介绍了应用视频监控功能的电梯远程监控系统的特点、微软的流媒体发布平台Windows Media Service以及在电梯远程监控系统中的视频监控完成的功能。重点描述了同原有的电梯远程监控系统相结合。视频监控的硬件及软件的实现，并提出了进一步进行视频网络传播的途径。     

基于电梯故障远程监控系统分析

电梯故障远程监控系统,是通过一定的线路,专门的控制系统,将从设置在电梯处的监控中心所获得的电梯运行数据通过传感器采集起来,然后再传送到远程端,通过微处理器进行非常态数据分析,最后将电梯的运行状况反映到相关工作人员手中。由此可见,电梯故障远程监控系统主要是对电梯的运行进行日常维护与修理、故障分析、故障诊断、电梯故障预先防范以及对电梯的运行状况进行统计分析等。由此可见,在电梯随处可见的今天,电梯故障远程监控系统起到了非常关键的作用,基于此,本文将从电梯故障远程监控系统的设计原理、运用现状以及电梯故障远程监控系统的未来发展方向进行简要分析。     

基于组态软件的电梯远程监控系统设计

电梯远程监控系统的主要目的是对在用电梯进行远程数据维护、远程故障诊断及处理、故障的早期预告及排除,以及对电梯运行状态进行统计,开发具有电梯远程监控、电梯管理与故障诊断等功能完善且适用广的系统,尤其是基于MCGS等组态软件的远程监控系统,是未来几年的发展方向。     

电梯远程监控系统

本文阐述了电梯远程监控系统的组成及应用过程，说明监控系统为电梯安全，正常运行起到了不可忽视的作用。     

W77E58单片机电梯故障状态监控设计

电梯远程监控技术近年来取得了长足发展，远程监控系统通过电话线或专用线路，由设在电梯维修服务中心的计算机对分布在各地的电梯进行远程监视和操作，对故障和运行状态进行监测统计等。监控系统主要由计算机监控中心和现场实时采集装置构成，前端机主要负责在电梯控制系统中进行数据采集。当电梯发生故障时，前端机接收故障状态信号并判断得出故障类型，把故障类型和故障时的运行状态等信息传给服务中心计算机；电梯正常运行时，前端机采集的信号不主动上传给服务器，服务器可主动拨号接通前端机，查询电梯的运行状态。     

网络化电梯远程监控系统设计

针对目前对电梯远程监控的迫切需求,研究并设计了一个基于嵌入式Linux的网络化电梯远程监控系统。该系统由安装在电梯控制柜中的嵌入式终端和远程监控中心服务器两部分组成,两部分通过Internet进行数据交互。基于该电梯监控系统,异地安装的电梯能将运行状态信息通过嵌入式终端传输给监控中心服务器,并能接受中心服务器的远程控制。实际应用表明,该系统稳定、可靠且实时性强,达到了电梯远程监控的高性能要求。     

基于LonWorks技术的电梯监控系统

介绍了一种基于LonWorks技术的电梯监控系统实现方案，该方案可实现电梯的本地集中监控和远程监控。     

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.