CAN通讯应用于电梯控制系统中的具体体现及作用探微

CAN通讯是一种专业的通讯技术，这种为了解决现代汽车控制与测试仪器之间的信息交换问题而产生的技术，近些年来得到了广泛应用。这项技术在电梯控制系统中的应用就是一个典型例子。电梯控制系统中的通讯问题历来是个难题。CAN通讯，在电梯控制系统中的应用能够有效解决通讯问题。本文将重点探讨CAN通讯在电梯控制系统中的具体应用。     

可编程控制器和变频器在电梯控制系统中的应用

阐述了可编程控制器应用于电梯的特点，编制了PLC—VVVF变频电梯控制系统框图；详细介绍了G7型变频器在电梯拖动控制系统中所起的作用以及电梯控制参数的选择，并分析了系统的节能效果。     

智能电梯控制系统的开发

本文主要介绍一种新型的智能电梯控制系统的构成，它与传统智能电梯控制系统的区别是取消了智能系统与控制系统之间需要点对点并行接口板，节省了资源，提高了可靠性，同时给了邮系统实现的方法。     

浅议电梯电气线路安全检验

电气控制系统是电梯的八大系统之一，是电梯安全运行的至关重要的因素之一，因此必须要对电梯的电气线路进行全面的安全检验，才能保护电梯的安全运行。     

电梯控制系统检验问题与解决方式研究

控制系统是电梯运行的核心与关键,如果控制系统出现问题,不仅会影响电梯的正常运行,同时还有可能会造成重大安全事故,所以控制系统检验显得尤为关键。文章通过对电梯工作原理以及检验必要性的分析,对电梯控制系统检验问题以及处理方式展开全面解读,旨在改善电梯控制系统检验现状,提升电梯控制系统检验水平。     

基于PLC的电梯控制系统的设计与实现

介绍了西门子公司S7—200系列可编程控制器（PLC）在三层电梯控制系统中的应用,给出了可编程控制器控制三层电梯电气控制系统的硬件组成和软件设计。提出了三层电梯的可编程控制器（PLC）控制系统总体设计方案、设计过程、系统组成,并设计了一套完整的电梯控制系统方案。最后通过三层电梯模型验证了其基本功能。结果表明该控制系统具有无司机控制功能,是一种具有高度的安全性、可靠性的电梯控制系统。     

基于PLC的电梯模型控制系统设计

目前，电梯控制系统已基本上淘汰了传统的继电器控制方式，取而代之的是以PLC和微控制器为核心的数字控制系统。介绍了采用双PLC及其PC-LINK网络设计的电梯模型控制系统，通过上位机软件对整个系统的运行进行实时监控。实际运行证明，该系统性能可靠。     

PLC串行通信在虚拟电梯系统中的开发与应用

主要介绍了采用Delphi IDE实现PLC与个人计算机之间串行通信的方法，并把此方法应用于虚拟电梯控制系统的开发与研究，实现了虚拟电梯控制系统与PLC之间的信息交换。     

探究电梯检测时控制系统常见问题及对策

随着电梯在不同建筑物中投入与使用比例不断提升，随之而来的电梯使用安全引起了大家的高度关注。然而，要想使电梯使用故障率有所降低，离不开电梯检测时控制系统问题的日常检查工作，所以更加需要事先制定出有效地提升电梯安全性能的应对策略，方才能第一时间排查电梯潜在安全隐患，真正做到电梯安全无小事，确保电梯能够平稳安全地运行。     

电梯控制系统可靠性研究

本文针对电梯控制系统可靠性进行研究探讨,并且充分考虑控制系统性能,分析影响电梯控制系统可靠性的主要因素,提出了电梯控制系统硬件及软件抗干扰措施。电梯控制系统硬件采用串模干扰、共模干扰、接地技术实现抗干扰;电梯控制系统软件通过设置自检程序、指令冗余技术、设置软件陷阱、等措施提高抗干扰性能。该措施于电域的其他控制系统也具有参考价值。     

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.