单片机在智能型交通信号控制机中的应用

为优化交通信号控制,实现城市道路网交通畅通的最大化,设计了一种基于STC89C52RD＋单片机的智能型多功能交通信号控制机。阐述了控制机的设计方案、软硬件设计以及实现方法。     

ML—1型路口交通信号自学习智能式控制机

交通信号控制机是用于城市交叉路口控制红、绿、黄灯色信号来指挥交通的装置,被控制对象是交叉路口的交通流过程。由于被控对象的不确定性和时变性,难于用数学模型描述,很难找到最优控制律。目前,多采用定时控制,控制效果不佳。我们采用智能控制原理于1989年10月研制成功自学习智能式交通信号控制机。该机在现场连续可靠运行已三年。运行结果表明其性能优良、控制效果好。本文介绍该机的原理、结构及应用情况。     

基于PLC控制的中药智能配药机

介绍了一种新型中药智能配药机控制系统。该系统为两级控制，PC机作为上位机进行信息管理和控制规划，PLC作为控制机实现控制任务。还介绍了独特的下药机构、配药机械手及控制系统组成。     

近期报刊部分文章题录

Ｃ 测控技术（月刊）２００１年第２期ＧＰＳ精度、风险及对策 吴广华 张杏谷等１基于 ＤＧＰＳ的车辆定位系统研究 刘瑞华等 ７基于磁阻传感器的组合定位系统及误差补偿 刘炳云等 １０因特网、控制网与智能型传感器 徐志祥等１３数据采集系统短期稳定性的一种评价方法 梁志国等１６基于原理图检测环境的设计与实现 徐波等２０智能交通信号控制机的研究 胡嗣云等２７一种多用户用电实时抄表系统的设计 曹长江等５４ＳＰＩ串行总线与与单片机系统有优化设计院 潘天红等５６ 测控技术（月刊）２００１年第３期低温电流比较仪及其应用 张钟华１…     

基于智能收发器FT3120的智能节点设计

介绍了一种基于国内最新型的智能收发器FT3120以及采用HOST BASE结构的新型智能节点的设计方法.利用双口RAM（CY7C026）成功地解决了将下位机数字信号处理器（DSP）控制信息传送到本上位节点,而本节点又可将信息通过Lonworks现场总线发送给中央控制机系统,由于系统的信息传递是双向的,所以本节点系统可以通过总线完成数据的智能上传和上位机对下位节点智能编程,因而也具有智能在线编程控制（IC）的先进特性.     

药房快速自动发药机单元的研发

介绍了新型自动化药房的功能结构,提出快速发药单元的概念及结构实现方案。在系统结构设计的基础上,设计了智能发药机的控制系统。系统为两级控制,PC机作为上位机进行信息管理和控制规划,PLC作为控制机实现控制任务。系统开发完成后已应用于医院门诊药房,运行效果良好。     

药房快速自动发药机单元的研发

介绍了新型自动化药房的功能结构,提出快速发药单元的概念及结构实现方案。在系统结构设计的基础上,设计了智能发药机的控制系统。系统为两级控制,PC机作为上位机进行信息管理和控制规划,PLC作为控制机实现控制任务。系统开发完成后已应用于医院门诊药房,运行效果良好。     

啤酒灌装微机控制系统

该系统由STD工业控制机、智能红外液位检测——传送器、压力变换器和自动阀门等现场检测执行机构组成。该系统实现了     

基于CPAC的智能交通信号灯的设计

交通信号灯是城市道路交通网中的主要控制设施,以往的交通信号的控制多半采用单片机,PLC控制,开发过程繁琐,兼容性不好。基于计算机可编程自动化控制器CPAC,采用ST语言作为主程序开发语言,完成了智能交通灯系统程序编写,设计出了系统的可视化界面,完成了系统硬软件的结合。从实验结果来看,系统具有较好的稳定性和准确性,能够进行上时间的无错运行。     

PLC在城市道路交通信号控制系统中的应用

随着我国城市和交通的迅速发展，交通管制日趋重要。原有的信号灯控制器已不能满足现实需要。城市道路交通信号PLC控制系统运行可靠，可实现交通信号管制的自动开停，控制方案的调整及优化简单易行，使用范围广、寿命长。文章对该控制系统的设计过程、设计思路、编程方法做了详尽的介绍，具有一定的参考价值和实用价值。     

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.     

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....     

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.