基于CAN总线的智能小区中电梯远程监控系统的设计

本文分析和比较了RS485和CAN总线的优缺点,提出了CAN总线组建智能小区中的电梯远程监控系统;分析了其系统组成,设计了电梯信息通讯卡和远程监控模块的软、硬件,最后设计了上位机监控软件,实现了对远程电梯的实时监控.     

基于CAN总线的烧结配料监控系统

介绍了一种基于CAN总线的烧结配料监控系统的设计.利用CAN总线实现系统内部控制器组网,利用组态王软件实现上位机监控,系统一方面对整个生产线进行实时监测,另一方面对现场设备进行独立远程控制,实现了分布式控制和集中管理.另外,系统中各个控制器采用单片机实现,体积小、成本低.     

RS485-CAN总线转换器设计与实现

CAN总线因其突出的可靠性、实时性、灵活性等优点而被广泛应用,目前采用RS 485的系统还比较多,RS485-CAN转换器实现两种总线的转换。基于MCS51单片机的RS 485/CAN智能转换器,硬件电路简单,软件流程简洁,该转换器可实现RS 485和CAN的双向通信,可用于RS 485系统到CAN系统的升级。     

基于Delphi的车间设备运行状况监控系统设计

为了提高工厂车间设备的运行效率,以退火炉车间为例,设计了一个稳定可行的车间设备运行状况监控系统。该监控系统采用RS485总线进行数据传输,欧姆龙CJ系列PLC进行信号采集与数据存储,通过Delphi7开发的软件结合ACCESS数据库对PLC中的数据进行处理,实现对车间设备的参数采集、记录查询和统计分析等功能。实践证明,该系统运行可靠,具有良好的工程实际应用价值。     

基于MCGS组态环境的化水处理监控系统设计与实现

MCGS是一种流行的组态软件开发环境.本文针对某小型电厂化水处理的工程实例,介绍了利用MCGS开发的一个监控系统.该系统采用研华ADAM模块实现数据采集与控制,采用RS485总线实现模块与上位机的通讯.系统测量准确、控制速度快,在实际应用中取得了理想的效果.     

基于RS485的空气颗粒监控系统

介绍了基于RS485总线的颗粒实时监控系统的构建,实现对无尘室空气中悬浮颗粒的远程监控。     

CAN总线技术在高低压配电在线检测系统中的应用

针对高低压配电在线检测系统以前大多采用基于BITBUS或RS485总线构建的监控网络系统所存在的缺点,提出了利用当前在工业控制领域领先的CAN总线技术,完成高低压配电系统的在线检测任务.详细说明了CAN总线通讯方式的优势和原理,介绍了利用CAN总线在线检测技术的主要硬件和软件设计方案及实施方法.     

工业电子秤进行多台联网的开发与应用

利用RS485总线方式对多台工业电子秤进行联网,实现远程数据的采集和监控,由RS232-485通讯转换器和系统软件完成Windows环境下计算机与多台工业电子秤的双向通信,解决了工业现场物料分散计量时存在的数据监控和统计难题。     

基于CAN总线的门禁控制系统

本文介绍一种基于CAN总线的门禁控制系统.门禁系统由读卡器、输入/输出设备、门禁控制器、计算机和门禁管理软件等组成.门禁控制器可以独立运行,也可以联网运行.计算机和所有的门禁控制器由通讯总线联成网络.目前.门禁系统最常用的总线是RS485总线.与RS485相比较,CAN总线的数据通信具有突出的可靠性和灵活性,并且CAN芯片价格便宜,技术容易掌握,性能优于RS485.因此开发采用CAN联网的门禁控制系统具有较大的现实意义和实用价值.     

基于RS485总线的热处理加热炉群监控系统

介绍了热处理加热炉群监控系统的设计,主要包括整个控制系统的组成结构、主站的设计、从站的设计、软件设计、人机界面的设计和系统实现的功能。详细介绍了RS485总线和MCGS组态软件的使用。     

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...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

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.     

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....