In the last decade the processing of polygonal meshes has emerged as an active and very productive research area. This can basically be attributed to two developments: Modern geometry acquisition devices, like laser scanners and MRT, easily produce raw polygonal meshes of ever growing complexity Downstream applications like analysis tools (medical imaging), computer Aided manufacturing, or numerical simulations all require high quality polygonal meshes as input. The need to bridge the gap between raw triangle soup data and high-quality polygon meshes has driven the research on ecient data structures and algorithms that directly operate on polygonal meshes rather than on a (most often not feasible) intermediate CAD representation.
标签： processing productive the polygonal
上传时间： 2017-06-03
上传用户：TF2015
Within this book the fundamental concepts associated with the topic of power electronic control are covered alongside the latest equipment and devices, new application areas and associated computer-assisted methods. *A practical guide to the control of reactive power systems *Ideal for postgraduate and professional courses *Covers the latest equipment and computer-Aided analysis
标签： power electronic electrical system
上传时间： 2015-02-20
上传用户：12345654321
PSCAD/EMTDC是加拿大马尼托巴高压直流研究中心出品的一款电力系统电磁暂态仿真软件，PSCAD（Power Systems Computer Aided Design）是用户界面，EMTDC（Electromagnetic Transients including DC）是内部程序。 EMTDC最初代表直流暂态，是一套基于软件的电磁暂态模拟程序。Dennis Woodford博士于1976年在加拿大曼尼托巴水电局开发完成了EMTDC的初版，编写这个程序的原因是因为当时现存的研究工具不能够满足曼尼托巴电力局对尼尔逊河高压直流工程进行强有力和灵活的研究的要求。自此之后程序被不断开发，至今已被广泛地应用在电力系统许多类型的模拟研究，其中包括交流研究，雷电过电压和电力电子学研究。EMTDC开始时在大型计算机上使用。然后在1986年被移植到Unix系统和以后的PC机上。 PSCAD代表电力系统计算机辅助设计，PSCAD的开发成功，使得用户能更方便地使用EMTDC进行电力系统分析，使电力系统复杂部分可视化成为可能，而且软件可以作为实时数字仿真器的前置端。可模拟任意大小的交直流系统。PSCAD V1 1988年首先在阿波罗工作站上使用，然后大约在1995年PSCAD V2开始应用。PSCAD V3以PC Windows作为平台，在1999年面世。目前最新版本的是PSCAD V4.2.1。 用户可以通过调用随EMTDC 主程序一起提供的库程序模块或利用用户自己开发的元部件模型有效地组装任何可以想象出的电力系统模型和结构。EMTDC 的威力之一是可以较为简单地模拟复杂电力系统, 包括直流输电系统和其相关的控制系统。 采用 PSCAD/EMTDC 进行的典型模拟研究包括： 一般的交流电力系统电磁暂态研究 直流输电结构和控制 FACTS(灵活交流输电系统)元部件模型 由于故障、断路器操作或雷电冲击引起的电力系统的过电压研究 绝缘配合研究 谐波相互影响研究 静止补偿器研究 非线性控制系统研究 变压器饱和研究, 如铁磁振荡和铁芯饱和不稳定性研究 同步发电机和感应电动机的扭矩效应和自励磁研究 陡前波分析 研究当一台多轴系发电机与串补线路或电力电子设备相互作用时的次同步谐振现象 向孤立负荷送电 电力系统数字仿真实验室使用PSCAD/EMTDC主要进行一般的交流电力系统电磁暂态研究，进行简单和复杂电力系统的故障建模及故障仿真，分析电力系统故障电磁暂态过程。
标签： PSCAD实验指导教程
上传时间： 2016-02-16
上传用户：xixi略
CAD(Computer Aided Design）诞生于60年代，是美国麻省理工大学提出了交互式图形学的研究计划，由于当时硬件设施的昂贵，只有美国通用汽车公司和美国波音航空公司使用自行开发的交互式绘图系统。计算机辅助设计(CAD-Computer Aided Design)指利用计算机及其图形设备帮助设计人员进行设计工作。 平面绘图：能以多种方式创建直线、圆、椭圆、多边形、样条曲线等基本图形对象。 绘图辅助工具：提供了正交、对象捕捉、极轴追踪、捕捉追踪等绘图辅助工具。正交功能使用户可以很方便地绘制水平、竖直直线，对象捕捉可 帮助拾取几何对象上的特殊点，而追踪功能使画斜线及沿不同方向定位点变得更加容易。 编辑图形：CAD具有强大的编辑功能，可以移动、复制、旋转、阵列、拉伸、延长、修剪、缩放对象等。 标注尺寸：可以创建多种类型尺寸，标注外观可以自行设定。 书写文字：能轻易在图形的任何位置、沿任何方向书写文字，可设定文字字体、倾斜角度及宽度缩放比例等属性。 图层管理功能：图形对象都位于某一图层上，可设定图层颜色、线型、线宽等特性。 三维绘图：可创建3D实体及表面模型，能对实体本身进行编辑。 网络功能：可将图形在网络上发布，或是通过网络访问AutoCAD资源。 数据交换 ：提供了多种图形图像数据交换格式及相应命令。
上传时间： 2016-03-29
上传用户：594551562
With the rapid expansion of wireless consumer products,there has been a con- siderable increase in the need for radio-frequency (RF) planning, link plan- ning, and propagation modeling.A network designer with no RF background may find himself/herself designing a wireless network. A wide array of RF planning software packages can provide some support, but there is no substi- tute for a fundamental understanding of the propagation process and the lim- itations of the models employed. Blind use of computer-Aided design (CAD) programs with no understanding of the physical fundamentals underlying the process can be a recipe for disaster. Having witnessed the results of this approach, I hope to spare others this frustration.
标签： Introduction Propagation to RF
上传时间： 2020-05-27
上传用户：shancjb
Since the first edition of the book was published, the field of modeling and simulation of communication systems has grown and matured in many ways, and the use of simulation as a day-to-day tool is now even more common practice. Many new modeling and simulation approaches have been developed in the recent years, many more commercial simulation packages are available, and the evolution of powerful general mathematical applications packages has provided still more options for computer-Aided design and analysis. With the current interest in digital mobile communications, a primary area of application of modeling and simulation is now to wireless systems of a different flavor than the traditional ones.
标签： Communication Simulation Systems of
上传时间： 2020-06-01
上传用户：shancjb
Failure analysis is invaluable in the learning process of electrostatic discharge (ESD) and electrical overstress (EOS) protection design and development [1–8]. In the failure analysis of EOS, ESD, and latchup events, there are a number of unique failure analysis processes andinformationthatcanprovidesignificantunderstandingandillumination[4].Today,thereis still no design methodology or computer-Aided design (CAD) tool which will predict EOS, ESDprotectionlevels,andlatchupinasemiconductorchip;thisisoneofthesignificantreasons why failure analysis is critical to the ESD design discipline.
标签： Mechanisms Failure Models ESD and
上传时间： 2020-06-05
上传用户：shancjb
The countless technological advances of the twentieth century require that futureengineering educationemphasizebridging thegapbetweentheoryand the real world.Thisedition hasbeenprepared withparticular attentiontothe needs of undergraduates, especially those who seek a solid foundation in control theory aswellas an ability tobridgethe gapbetween control theory and itsreal- world applications.To help the reader achieve this goal, computer-Aided design accuracy checks (CADAC) are used throughout the text to encourage good habits of computerliteracy.Each CADAC uses fundamentalconcepts to ensure the viability of a computer solution.
标签： Analysis Control Linear Design System Fifth and
上传时间： 2020-06-10
上传用户：shancjb
电力系统是一个大规模、时变的复杂系统，在国民经济中有非常重要的作用。电力系统数字仿真已成为电力系统研究、规划、运行、设计等各个方面不可或缺的工具，特别是电力系统新技术的开发研究、新装置的设计、参数的确定更是需要通过仿真来确认。目前常用的电力系统仿真软件有：（1）邦纳维尔电力局（Bonneville Power Administration，BPA）开发的BPA程序和EMTP（Electromagnetic Transients Program）程序；（2）曼尼托巴高压直流输电研究中心（Manitoba HVDC Research Center）开发的PSCAD/EMTDC（Power System Computer Aided Design/Electromagnetic Transients Program including Direct Current）程序；（3）德国西门子公司研制的电力系统仿真软件NETOMAC（Network Torsion Machine Control）；（4）中国电力科学研究院开发的电力系统分析综合程序PSASP（Power System Analysis Software Package）；（5）MathWorks公司开发的科学与工程计算软件MATLAB（Matrix Laboratory，矩阵实验室）。
上传时间： 2022-07-27
上传用户：
