企业用电设备能效监测信息系统的设计与实现

针对企业用电设备的工作运行状况,设计实现了企业用电设备能效监测信息系统.系统采用无线通信方式进行远程数据采集,实时监测用电设备的运行工况和能源消耗过程,并对各特性参数和能耗数据进行分析和计算,测算出企业用电设备能效及耗能过程中各环节的节能潜力,为企业的节能工作提供科学有效的途径.     

电能信息多模式远程通信系统的设计与实现

针对电能信息采集远程传输的实际应用需求,本文设计开发了电能信息的多模式远程通信系统,实现了有线以太网和无线GPRS两种远程通信方式。采集终端采集的电能信息通过无线传感网络传输给协调器,再经过多模式远程通信系统,将电能信息传输到远程服务器;另一方面,也可以在远程终端通过多模式远程通信系统发送对用电设备的控制指令。     

智能家电能耗监测系统的设计与实现

为了给用户提供一个显示家庭用电设备能耗的平台,结合电能检测技术、无线网络传输和嵌入式控制技术,设计了一套家庭用电设备电能检测系统。通过对本系统的研究,阐述了CS5460A电能检测模块,ZigBee无线传输模块,显示模块以及核心控制模块。实验结果表明,所设计的智能家电能耗检测系统实现了无线采集用电设备的用电量在LCD和上位机上显示,且所采集的电能相对误差符合国家相关标准。     

基于CC2420的无线信号采集系统的设计与实现

针对现代无线设备发展需要,研发了一种由微机与ARMS3C2410系统为核心的无线信号采集系统,通过CC2420无线收发模块实现数据采集无线化,现场从机采集的数据通过无线信道传送到主机,主机通过RS232与上位机PC进行串行通信,实现对设备的无线智能调控。实验证明该系统结构简单、传输可靠和可扩展性好,满足实际测试场合的需要。     

基于无线传感网的机械式电能表用电数据采集方法

设计一种基于无线传感网络的用电数据自动采集方法。利用四叉树分层算法将无线传感网络划分为多个簇，为每个簇群和簇内节点赋予唯一的id标识；利用四层树形结构的路由协议，选择无线传感网络路由，实现机械式电能表用电数据的层层传输；构建用电数据自动采集模型，利用奈奎斯特定理对用电数据完成采集。通过实验验证了所设计的用电数据自动采集方法能够保持较高的采集精度，同时丢包率和采集时延较低，可有效提高用电数据采集的工作效率，具有较好的应用效果。     

基于统一数据采集与集中监控平台的用电信息采集系统设计

基于统一数据采集与集中监控平台的用电信息采集系统可对配电网络的传输线路、变压器、配电器和终端用户的用电情况进行数据采集分析和监控,达成用户用电监测、阶梯定价、线损分析、错峰用电、用电检查、自动抄表、负荷预测管理和节约用电等目的。根据当前农村配电网络信息采集和监控存在的问题,结合用电实际特点,设计了一套基于统一数据采集与集中监控平台的用电信息采集系统,为推进农村用电网络信息化、数据化、集成化管理提供了技术支撑。     

企业排污监测用电数据智能采集分析系统

随着工业化规模的不断扩大,中小微型企业大量涌现,而这些企业在污染物排放方面存在应停不停、应减不减等违规问题。针对此类企业的污染物排放,实现实时监管迫在眉睫。因此,该文提出了一种企业排污监测用电数据智能采集分析系统,该系统可以远程监测排污企业设备的运行情况,其采用物联网三层架构。首先,感知层采用RS485总线技术、LoRa无线组网对排污设备用电数据进行采集、传输;其次,网络层采用LoRa,GPRS无线组网技术实现多点位电量数据的集成、汇总,以i TOP-4412开发板作为系统数据中转设备,接收来自排污设备的电气参数与位置信息;最后,后台管理系统作为应用层实现不同企业不同点位电量信息的统计、查询与分析。经实验室调试,该设计采用对排污企业用电量实时监测的间接监测方式,为实现中小微型企业违规排污行为的监测提供了基础,具有广泛的应用前景。     

气动系统的无线数据采集与控制研究

将无线通信技术引入气动系统,实现了气动系统数据采集与控制的无线化。把气动系统中的数据采集设备、控制设备、中央控制器与无线通信模块有机结合起来,通过这些无线通信模块间的无线传输,实现了气动系统中央控制器与数据采集设备以及控制设备间的无线连接。     

基于桥梁应变测量的现场无线数据采集子系统的硬件构架设计

基于桥梁应变测量的远程无线数据采集系统利用无线数传技术和GPRS网络资源,实现了对某地区的多座桥梁健康信息的远程数据采集.短距离现场无线数据采集子系统的硬件构架设计是系统的关键环节,它包括桥梁应变采集前向通道的硬件电路,微功率短距离无线数传模块DTD462A的硬件结构,基于MSC1210和DTD462A的桥梁应变无线数据采集节点,和基于AT89C2051和DTIMf2A现场主控节点.仿真结果表明:一个采集节点在l s内.可以实现8个测点应变数据的采集和传送,误码率可降低到1O-6,精度在1微应变以内,确保了数据传输的有效性和可靠性.     

煤机设备无线自供电状态监测系统

针对当下煤机设备状态监测系统时效性差、通信电缆铺设困难、需要定期更换电池等问题,提出了一种基于无线传感器网络与自供电技术的监测系统设计方法。系统由能量采集模块、无线传感器网络及监测上位机组成,通过能量采集模块收集煤机设备振动能量为节点电路供电,采用无线传感器网络与上位机实现设备关键状态信息的采集、传输与处理。测试结果表明,系统可在30 m有效范围内实现对煤机设备运行状态的实时监测,能量采集模块最大输出功率可达378 mW,能够有效收集设备振动能量实现系统能源自供给。     

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...     

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...     

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。     

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。     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

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。     

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...