科学计算可视化技术在低压电器中的应用

科学计算可视化技术是综合计算机图像学,图像处理,计算机辅助设计,人机交互技术等多个领域的一个崭新的技术领域。本文介绍这种新技术的概念及其在低压电器中的应用。     

几何变换单元的设计及其FPGA实现

随着计算机绘图规模的需要,借助辅助硬件资源,来提高图形处理单元(GPU)处理速度的需求越来越普遍.结合计算机绘图及FPGA的特点,本文采用Top-Down的方法对GPU几何变换单元部分进行了FPGA设计实现.所有结构模块均实现了RTL级建模,并对其中较复杂的矩阵构造单元和矩阵乘法器模块给出了详细的描述.最后借助电子设计自动化工具(EDA)对整个模块进行了验证综合,结果表明,符合设计需求,该方案能很好地完成几何变换功能,资源耗费低,最高工作频率可达120 MHz.     

On a fundamental physical principle underlying the point locationalgorithm in computer graphics [for EM field theory]

The issue of point location is an important problem in computer graphics and the study of efficient data structures and fast algorithms is an important research area for both computer graphics and computational geometry disciplines. When filling the interior region of a planar polygon in computer graphics, it is necessary to identify all points that lie within the interior region and those that are outside. Sutherland and Hodgman are credited for designing the first algorithm to solve the problem. Their approach utilizes vector construction and vector cross products, and forms the basis of the “odd parity” rule. To verify whether a test point is within or outside a given planar polygon, a ray from the test point is drawn extending to infinity in any direction without intersecting a vertex. If the ray intersects the polygon outline an odd number of times, the region is considered interior. Otherwise, the point is outside the region. In three-dimensional space (3-space), Lee and Preparata propose an algorithm but their approach is limited to point location relative to convex polyhedrons with vertices in 3-space. Although it is rich on optimal data structures to reduce the storage requirement and efficient algorithms for fast execution, a proof of correctness of the algorithm, applied to the general problem of point location relative to any arbitrary surface in 3-space, is absent in the literature. This paper argues that the electromagnetic field theory and Gauss's Law constitute a fundamental basis for the “odd parity” rule and shows that the “odd parity” rule may be correctly extended to point location relative to any arbitrary closed surface in 3-space     

Three-dimensional computer graphics using EGA or VGA card

An upper-level undergraduate 3-D computer graphics course using the IBM PC with an enhanced graphics adapter (EGA) or video graphics array (VGA) card was developed. Topics discussed in this course include three-dimensional viewing transformations, geometric transformations, animation, hidden line and surface removal, interpolations, and shading techniques. A broad coverage of computer graphics techniques and the easy accessibility of the IBM PC to a large number of students are the major features of the course     

Computer Graphics and Petrochemical Plant Design

The massive amount of data required to design petrochemical plants lends itself to computer applications. The basic computer graphics (CAD/CAE) system capabilities and operation are explained and the various benefits to be realized are discussed. Fluor's application of CAD/CAE is described, along with a discussion of CAD/CAE operator training and data safeguarding. A case history of Fluor's operation of graphics for 1982 is presented for information. The potential for future graphics usage and overall computer applications to petrochemical plant design is discussed.     

华东电网大型变配电仿真系统图形用户界面的实现

图形用户界面 (GUI)是指在应用程序中以图形化的界面实现人机交互的一种新颖计算机技术。在电力系统仿真中 ,这一技术的应用已越来越广。GUI对模拟电力系统真实环境 ,为培训人员提供良好的操作界面 ,提供了实现的途径。详细介绍了华东电网 5 0 0kV变配电仿真系统图形界面的实现过程 ,以及该系统的总体结构、技术要点及其功能。程序采用C语言编写 ,在UNIX环境下编译、链接     

Use of Interactive Computer Graphics in EM Fields Courses

This paper discusses experience in the use interactive computer graphics in a first electric and magnetic fields course, taught at the junior level in the Electrical and Computer Engineering Department at the University of Michigan. Interactive computer graphics in this discussion means that in the teaching-learning process, both instructor and students set up, display, and study solutions of electric and/or magnetic field problems, using graphics terminals such as the COMPUTEK 400/20 and the TEKTRONIX T4002.1.2 Interactive computer graphics can be a real asset in helping both instructor and students with the teaching-learning process. It allows the instructor to present to the class solutions for a wide range of field problems in the form of curves and drawings which are easy to understand. Most of these presentations would be too tedious to do in any other way. The student can then experiment further with these field phenomena, trying a variety of different situations as dictated by his curiosity or as directed by the instructor. Thus, interactive computer graphics allows the class to probe more deeply into a broader range of field phenomena, yet stay within the usual constraints of time and expertise available in a junior level class.     

The rise of embedded processing and the opportunity for open standards

Embedded processing is experiencing rapid growth. More semiconductors are sold for embedded applications than for desktop computers. Processors are found in automobiles, multimedia devices, cell phones, appliances, and soon may appear in paper (or its replacement.) General purpose computing divided the enormous expense of hardware among a large number of tasks. A well-understood, open, standard operating system core is needed if the growth of embedded systems is to continue unhindered. Operating system refer to a massive collection of programs that includes the core operating system, the graphics and user interfaces built on top of it, communications software, and the suite of user applications that are woven throughout. Only the core operating system is relevant to most dedicated devices. Linux is an operating system that is free for anyone to use or modify for their own purpose. Although its most prominent use is in desktop computers, it is used in a wide range of applications including embedded applications and large computer clusters. The principles of operating systems are well known. For desktop computers an open source operating system core may become a world standard.     

Computers and computer graphics in the teaching of field phenomena

The use of computers and computer graphics in the teaching of sophomore/junior level students majoring in electrical engineering and computer engineering is discussed. Any previous study of electromagnetic fields is presumed to have been limited to a brief exposure in freshman physics. The author has been using both instructor-written and student-written programs in teaching various topics in the fields area for many years. The major part of the discussion concerns static field phenomena, since the basic introductory concepts taught to these student begins with static phenomena and since the physical meaning of many field quantities can best be understood in terms of static fields. Some of the ways the author is implementing the use of computers and computer graphics in his electromagnetics classes are described     

Multimedia-where things stand currently

Multimedia is the combination of text, graphics, audio, animation, and full-motion video. To realize a multimedia platform, traditional magnetic disks and simple graphics cards and displays are not enough. Compact disk drives must be used for storage and super VGA adapters are needed for the graphics. The paper explains the hardware requirements of a multimedia computer system and describes some of the first multimedia products that have come to market. Each of the hardware subsystems has been used before, separately, but the integration of these systems is a much more complicated task     

EPLOT: a machine-independent graphics system

EPLOT was designed as an inexpensive and interactive small graphics library to be run on workstations, stand-alone microcomputers and mainframes, or microcomputers used as graphics terminals. It started as a minor extension to the machine-independent UNIX PLOT library but now includes capabilities for menu and mouse operations, animation, and other functions required in student projects. EPLOT allows the easy development and transfer of interactive graphics programs between SUN, MSDOS, Amiga, ATARI, and Apple Macintosh systems. It has played an important role in the philosophy of the computer graphics course offered at the authors' institution. The scope of EPLOT is demonstrated through a series of projects and programs     

一个交互式数据文件编辑程序

在交互式计算机绘图中,数据输入与编辑是非常重要的一环。本文介绍一个数据编辑程序CEDT·BAS,它可以方便地交互式地制作图形数据库。它具有对数据进行修改、插入、删除、存储等11种功能。文中重点介绍了程序流程、编辑命令及与绘图主程序的接口模块。     

客户服务器模式监控系统

客户／服务器是近几年才推出的新一代计算机控制系统模式。这种模式的监控系统因功能强大和性能可靠而被广泛地应用于电厂、变电站及其它工业领域。从操作系统、图形、数据库几个方面,介绍一种基于WindowsNT网络操作系统和SQLServer网络数据库,利用PowerBuilder数据库前端开发工具和VisuvalC 编程语言开发的客户服务器模式监控系统。     

Promoting the application of expert systems in short-term unitcommitment

A heuristic approach to the short-term unit commitment problem is presented. The generating unit's capacities are divided into thee categories, and then a rough 24 h-generation schedule is established. The global optimization is performed as an inference process. A prototype system is developed and tested on an IBM-386 personal computer using the C language. The ToolBook software is used to enhance the graphics capability of the package. The primary advantage of the proposed method is its short processing time for each schedule, as it schedules the generation unit commitment for a typical system in less than 2 s. The same system is examined by dynamic programming with an average running time of 20 min on an IBM 386 personal computer     

齐次坐标变换在IsA系统操作员站仿真中的应用

介绍了在进行IA系统操作员站仿真过程中,采用齐次坐标变换对IA系统操作员站图形文件进行了仿真还原,表明了计算机图形学在操作员站仿真中的应用,使得仿真逼真度大大提高,减轻了仿真机开发人员的开发强度,极大地缩短了操作员站仿真的开发周期.     

低压断路器可视化仿真系统的研究

可视化仿真技术是综合计算机图象学、图象处理、计算机辅助设计、人机交互技术等多个的一个崭新的技术领域。本文研究了这种新技术在低压电器中的应用。根据低压断路器开断时电弧的物理过程,建立了以磁流体动力学ＭＨＤ为基础的电主以热击穿为主的背后击穿物理模型。把这种仿真算法和三维可视化技术结合起来,对低压断路器开娄过程中的电弧运行进行了可视化仿真研究。     

Computer graphics

The history of computer graphics is sketched. Hardware principles are outlined, and the various types of display are described. Computer graphic standards are discussed. Future developments are predicted     

Interactive software for undergraduate electromagnetics

To demonstrate the relationship between physical reality and the equations used in electromagnetics, the authors have created interactive software using Mathematica with its notebook capability. The software is composed of different notebooks, each covering a specific topic, which are collectively called EM Notebooks. The notebooks are used in a workstation laboratory of 12 NeXT computers in conjunction with two required junior-level courses in electromagnetics. Each notebook consists of text, equations, and graphics. The equations are Mathematica commands that are used to evaluate electromagnetic formulas found in a typical undergraduate electromagnetics textbook. Equation parameters can be changed by a student permitting examination of an unlimited number of examples. In addition, much of the graphics can be animated. The animations provide a pedagogic tool unavailable in traditional textbooks. EM Notebooks must be used on a computer that runs Mathematica with the notebook facility     

MIDAS: A Microprocessor Display and Animation System

An interactive graphics program has been developed to simulate and animate the operation of a typical microcomputer system. MIDAS, a microprocessor interpreter display and animation system, allows the user full control over the simulation and the display and provides several auxiliary functions that enhance its capabilities as an instructional tool. The illustration of the activity of the computer, based on the Intel 8080 microprocessor, takes the form of an animated block diagram of the CPU and its peripherals. It shows the operation of the system at various levels of detail, down to the level of the devices' internal registers, buffers, control lines, and buses. This paper describes the design, implementation, and use of MIDAS. It discusses its effectiveness as a tool for teaching the complex, asynchronous interaction between devices of a computer system (known as "handshaking"). It also discusses a strategy for developing a generalized tool for simulating and animating arbitrary computer systems.