采用GPRS技术的CAN总线塔机安全监控系统

介绍一种基于GPRS技术的CAN总线塔机安全监控系统的设计与实现。系统由数据采集模块、CAN总线收发模块、人机交互界面以及GPRS模块组成。系统以STC89C516单片机为主控制器,实现了塔机运行时工作状态的监控、显示、记录和报警,并实时将数据通过GPRS模块上传到网络,以及将报警信号发送到手机终端,在监控中心实现远程多机联合监控。实践证明:系统具有良好的实时性、可靠性以及广泛的应用价值。     

一种基于GPRS的太阳能集热远程监控系统设计

太阳能集热工程应用越来越广,其可靠性和安全性也越来越受到重视。设计了一种基于GPRS的太阳能集热远程监控系统,采用PLC和触摸屏实现本地控制,采用GPRS模块实现远程监控和远程故障诊断,可将实时数据上传至远程监控服务器并储存,并可接受服务器远程控制。该系统具有节能、清洁、稳定、可靠的优点。     

基于GPRS技术远程水文自动监测终端设计

为了改善现有的水文观测站和水文信息采集点水位监测系统的现状,采用GPRS技术构建水文数据采集系统,不仅能很好地满足水文信息采集的需求,还能实现目前城市重点道路的隧道和涵洞防涝监测功能。该终端利用核心控制器以及GPS、GPRS、LED和LCD显示等技术,实现实时水位显示监控和远程定位及控制功能,达到方便水利部门实时监控水位,远程定位和维护目的。     

基于Android平台的移动式燃气调压站监控系统设计

为解决燃气小型调压站分布广、实时远程移动式监控难的问题,以STM32为主控芯片,结合GPRS无线技术和互联网Android平台设计燃气调压站远程实时监控系统。系统采用STM32微处理器实时采集现场压力、温度、流量以及泄漏情况数据,并以GPRS无线的方式上传数据至云服务器。Android终端连接至云服务器可以实时获取调压站数据,并根据末端需求实时调整现场电气设备参数。测试结果显示,该系统实现了对多个调压站数据实时移动式监控,并具有运行稳定可靠、操作简单特点。     

危险品集装箱状态实时监测系统设计

结合目前危险品集装箱道路运输监控管理现状以及运输过程中的监控要求,选择温度、湿度、振动、烟雾、倾角等几种典型状态作为监控参量,基于无线射频RFID技术、GPRS/GPS技术和传感采集技术,研制出危险品集装箱状态信息实时监测系统。监测系统中功能独特的集装箱电子标签,实时获取集装箱状态采集控制模块发出的状态信息,并发送给车载危险品监控终端;车载终端通过GPRS将危险品集装箱状态信息、车辆行驶状态及定位信息发送到远程监控管理系统,从而实现对运输过程中的危险品集装箱状态的实时监测与追踪。     

基于ZigBee的智能家居安全监控系统研究

为实现对家庭安全的实时监控,设计了智能家居远程安全监控系统。系统基于ZigBee技术和GSM／GPRS网络进行设计,能够通过彩信和短信发出监控图像和报警信息,接收远程指令;同时引入了多种传感器,实现了对家用电器的远程控制,实现了智能家居远程监控。重点阐述了系统的硬件、软件设计以及系统的性能测试,实现了多个监控装置的无线联网。实验结果表明,所设计的系统能够实现安全、便捷的智能家居远程监控,并具有较高的可用性和可靠性。     

基于GPRS的疏浚钢管远程测厚系统的研究

为了实时获取绞吸式挖泥船输泥管线中疏浚钢管的磨损情况,在手持式测厚仪的基础上,设计了一种基于GPRS的远程超声波测厚系统。详细阐述了系统的总体架构、测厚终端设计原理、GPRS通信模块设计,以及远程通信协议的制定,最后通过GPRS网络,将测厚终端与数据监控中心连接,打破了地形距离的限制,实现系统的实时厚度测量、GPRS远程数据通信,以及数据中心远程监控等功能。将其运用到管道运输行业,可有效预防爆管事故。     

基于GPRS的网络加工组态监控系统设计

针对传统的生产监控系统(PMC)成本较高,兼容性不强,以组态王6.5为平台,采用MC55通信模块,集组态技术、GPRS技术、无线网络通信技术和计算机测控技术于一体,提出了一种局域网络加工实时监控系统的设计方法,实现了实时监控、报警联网和远程监控管理功能.     

基于GPS/GPRS/GIS的冷链物流车载监控系统

为实现冷冻肉类食品运输过程中的食品安全追溯,以冷链运输车辆为监控对象,以嵌入式控制技术为基础,集成应用GPS定位技术、GPRS无线通信技术和GIS地理信息技术,构建了车载监控系统体系结构。研究了基于车辆运行轨迹的变周期信息传输方式,以减少GPRS数据流量,提出了最小垂直距离的地图匹配算法,设计开发车载实时监控系统,实现冷链物流过程车辆地理信息及车厢温度等状态信息的远程实时监控和可视化地图管理。     

基于GPRS探井生产参数监测系统的研究

为了实现探井生产参数的信号采集与数据远程监控,系统达到了探井生产数据资源共享的目的.系统采用现场采集终端对探井生产中的压力、流量、大钩载荷、位移传感器等参数进行实时监测,并将实时监测的数据通过GPRS和Internet进行远程传输、控制、管理.实验表明:GPRS数据传输网络在探井生产参数监测系统中完全适用.     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.