LonWorks技术在楼宇自动化系统中的应用研究

结合智能大厦的特点,介绍了LonWorks现场总线技术的基本概念和总体结构功能,论述了用LonWorks技术实现的楼宇自动化系统（BAS）的控制方案,充分体现了现场总线在楼宇自控系统中应用的广阔前景。     

基于LonWorks技术的智能建筑楼宇自动化系统的研究

楼宇自动化系统作为智能建筑的一个重要组成部分,其系统构成与运行直接影响到整个智能建筑系统运行的成败.LonWorks总线因其很强的开放性、兼容性、灵活性、安全性、可靠性和可互操作性,已被广泛应用于智能建筑领域.本文介绍了智能建筑和现场总线的基本概念,在了解和掌握LonWorks现场总线技术的基础上,提出了一种基于LonWorks技术的空调系统设计方案.     

基于LonWorks控制网络的自控实验室的建设

本文介绍基于LonWorks技术组成的自控实验室的网络结构,以及第三代LonWorks产品的主要技术特点与性能。     

基于LonWorks现场总线的楼宇自控系统设计

本文针对某工程提出了基于LonWorks现场总线的控制方式,阐述了LonWorks技术的应用及系统升级的优越性,并展望现场总线在楼宇自动化领域的前景。     

基于LonWorks现场总线和IC卡技术的智能停车场设计

本文介绍了基于LonWorks现场总线和IC卡技术组建智能停车场系统,并作为楼宇自动化系统(BAS)的一个子控制系统,以完成停车场的相关数据采集、自动监控、自动收费和防盗等功能.     

基于LonWorks技术的中央空调自动控制系统设计及节能研究

介绍了基于LonWorks技术的中央空调自动控制系统设计方法,给出具体的硬件实现,介绍了温、湿度控制程序的软件实现,并就中央空调自控系统的节能做了简单分析。     

楼宇自控技术浅析

楼宇自控技术的两个关键指标是网络协议的开放性与系统产品的兼容性，本文依据这一线索，对楼宇自控技术进行了阐述。     

BACnet标准的某些技术特点--事件与报警

由于BACnet标准在楼宇自控系统中的重要有特殊作用，所以有必要对BACnet标准的技术特点进行深入分析，从而使我们在建立以BACnet标准为基础的楼宇自控系统的开发过程中，能充分认识到它的特点与内在的规律性，更快地开发出较高水平的具有自主知识产权的国产化的楼宇自控系统。     

楼宇自控的革命——大道至简

霍尼韦尔深度剖析影响楼宇自控系统开通和发展中存在的问题和瓶颈。研发出霍尼韦尔楼宇自控系统A1系列产品。将复杂的楼宇自控系统标准化、扁平化,让更多的人可以短时间内掌握调试和操作方法。提高楼宇自控系统的普及度和开通率,真正将楼宇自控系统做到易于设计、易于安装、易于调试、易于服务和易于升级。     

基子LonWorks技术的楼宇自控系统开发

针对楼宇自控系统网络互连性和现场要求等方面分析了Lonworks技术适用于楼宇自动控制系统的性能特点，在此基础上针对某智能化住宅小区监控系统介绍了Lonworks技术在楼宇自控系统中的应用，该小区监控系统功能主要包括自动读取水、电、气、热水计量数据、保安防盗和设备控制等。系统中应用软件任务采用Neuronc开发，系统软件采用Delphi开发，后台数据库采用Microsoft SOL Server 2000实现。     

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.     

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.     

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...     

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....     

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.