基于事例推理方法的电力工程智能设计研究

将基于事例的推理方法引入电力工程智能设计领域,这种方法能很好地模仿设计人员根据 设计条件直接映射出施工图成品的类比推理思维方式,并结合演绎推理方法,互补不足,解 决了电气工程智能设计的关键问题。从而使设计问题求解以一种更为智能的方式进行,将所 能处理的设计范围扩大到包括施工图设计在内的全部设计领域。     

220kVXLPE绝缘电力电缆的设计及试制

通过 2 2 0 k V交联聚乙烯绝缘电力电缆的设计和试制 ,对以下几个问题进行分析和说明 :(1 )电缆的导体结构 ;(2 )绝缘厚度的设计 ;(3)导体屏蔽及绝缘屏蔽的屏蔽方式及厚度选取和材料的选用 ;(4)金属护套的功能及其厚度的选定、轧纹形状及阻水性能试验验证 ;(5)纵向阻水层结构的设计 ;(6)试制过程的工艺要点。文中还指出了通过产品的型式试验 ,证明产品的技术指标达到或超过设计要求     

Analytical Bode Design of Controllers

This paper extends an approach for the analytical design of controllers by frequency-response techniques to include the dc gain as a design parameter. Additionally, the technique is extended to the design of proportional-integral (PI) and proportional-derivative (PD) controllers, and a more direct proof of the design technique is given.     

IIR数字滤波器设计

介绍了利用双线性变换法设计巴特沃斯无限长单位冲激响应(IIR)数字滤波器.具体设计步骤如下:按一定的技术指标将给出的数字滤波器转换为模拟低通滤波器;根据转换后的技术指标设计模拟低通滤波器H(s);再将H(s)转换成H(z).对于高通、带通或带阻数字滤波器的设计,先将其技术指标转化为与之相应的作为"样本"的低通模拟滤波器的技术指标,再进行频率变换,然后按上述步骤设计出低通H(s),再将H(s)转换为所需的H(z).     

MES - a web-based design tool for microwave engineering

Microwave engineering often involves extensive circuit analysis and design, typically requiring precise calculations. To expedite the handling of complicated design calculations, a Web-based design tool named Microwave Engineering Solutions (MES) was developed as a graduate student project in the Electrical and Computer Engineering Department at North Dakota State University (NDSU), Fargo, and is described in this paper. JavaScript, PHP, and Perl were used to develop MES, which consists of three design tools: 1) FilTech*a design tool for analog filters, 2) LMatch*a design tool for impedance matching, and 3) MicroLines*a design tool for striplines and microwave network analysis. MES is used by Electrical and Computer Engineering (ECE) students studying various aspects of electromagnetics and is freely available on the Web via the link at http://venus.ece.ndsu.nodak.edu//spl sim/ronelson/MESLink/index.html.     

基于推理模型和模糊评估算法的锅炉智能设计

结合规则推理和实例推理推理模型,提出针对锅炉设计的模糊评估算法,经过模型与算法的结合,可有效实现锅炉的智能化设计。通过对设计过程的详细描述,给出了锅炉参数化设计中相关参数定义及要求,理论上论证了该模糊评估算法与推理模型结合的设计方案的可行性。该设计方案的提出和应用,为锅炉的智能化设计研究提供了一种较为合理可行的思路。结合现场锅炉设计案例,成功实现了锅炉的智能设计,证明了该方案在实际应用中的有效性和正确性。同时,结合实例还给出了每个设计过程中的一些必要的设计前提。结论揭示了该研究对于锅炉CAD智能化设计具有较大的参考价值。     

Investigation of the gate-driven effect and substrate-triggeredeffect on ESD robustness of CMOS devices

The gate-driven effect and substrate-triggered effect on electrostatic discharge (ESD) robustness of CMOS devices are measured and compared in this paper. The operation principles of gate-grounded design, gate-driven design, and substrate-triggered design on CMOS devices for ESD protection are explained clearly by energy-band diagrams. The relations between ESD robustness and the devices with different triggered methods are also explained by transmission line pulsing (TLP) measured results and energy-band diagrams. The turn-on mechanisms of nMOS devices with triggered methods are further verified using the emission microscope (EMMI) photographs of the nMOS devices under current stress. The experimental results confirm that the substrate-triggered design can effectively and continually improve ESD robustness of CMOS devices better than the gate-driven design. The human body model (HBM) ESD level of nMOS with a W/L of 400 μm/0.8 μm in a silicided CMOS process can be improved from the original 3.5 kV to over 8 kV by using the substrate-triggered design. The gate-driven design cannot continually improve the ESD level of the device in the same deep-submicron CMOS process     

Electrical design of large‐scale tubular PM linear generators for wave energy conversion

We propose a novel conceptual structure of a large‐scale wave energy converter (WEC) and develop an electrical design method for tubular permanent magnet linear generators (PM‐LGs) adopted in the WEC. We describe the electrical design method of the PM‐LGs in detail, with design results of 1 MW PM‐LGs presented. Magnetic flux distribution obtained by the simulation is further analyzed, which shows good agreement with the design results. The electrical design method of large‐scale PM‐LGs described in this paper provides a reference to design large‐scale electric machines.     

基于FPGA的IRIG-B(DC)解码编码器设计

针对机载测试系统以IRIG-B（DC）码作为整个系统的时间源,提出一种基于FPGA的解码编码器设计。该设计采用FPGA为主控制器,实现IRIG-B（DC）码的解码、秒脉冲生成、IRIG-B码编码等功能,当外部IRIG-B码输入中断时,可按系统时间产生IRIG-B码输出。主要阐述了IRIG-B（DC）码的格式,详细介绍了IRIG-B（DC）码解码编码器的软硬件设计,在实验室搭建测试环境对该设计进行了测试验证,结果表明该设计能够稳定可靠运行。     

勘测设计企业多专业协同设计构想

新提出了3种多专业协同设计的理念及方法:网上集中设计、网上协同设计、电厂虚拟设计(三维设计), 其协同程度及实现难度逐步增强。网上集中设计的协同成分较少,但可在操作系统的支持下完成,是简单、实用的协 同设计方法。网上协同设计的协同程度较高,是传统设计流程的网络化模拟。电厂虚拟设计(三维设计)是协同设计 的最高境界,它将引发设计企业传统的设计流程和归档模式的彻底变革,最终导致设计企业现代化时代的到来。     

飞轮储能用磁悬浮开关磁阻电机多目标优化设计

研究了一种基于遗传粒子群综合算法(GPSOA)的飞轮储能(FES)用的单绕组磁悬浮开关磁阻电机(SWBSRM)多目标优化设计方案。结合有限元分析(FEA),通过敏感性分析得到SWBSRM悬浮力与效率随主要尺寸参数变化的一般规律。在此基础上,利用GPSOA以悬浮力和效率为目标函数对SWBSRM进行了全局寻优,获得使悬浮力最大和效率最高的参数优化组合。利用FEA对比优化前后电机悬浮力、铁损及磁密的大小,验证了GPSOA多目标优化的有效性。     

Senior design for persons with disabilities

This article provides an overview of senior design in the United States and its impact around the world. Within the United States, the National Science Foundation (NSF) Senior Design Projects to Aid Persons with Disabilities program has provided funding since 1988 to thousands of senior design projects that have been completed by students for persons with disabilities. This program combines the academic requirement of a design experience with enhanced educational opportunities for students, and it improves the quality of life for disabled individuals. Also described are two national design competitions hosted by the Rehabilitation Research's Rehabilitation Engineering Research Center (RERC) on Accessible Medical Instrumentation (AMI) and the National Collegiate Inventors and Innovators Alliance (NCIIA). In addition, there are a number of biomedical engineering (BMH) programs in the United States that provide an opportunity for students to design and construct projects for individuals in developing countries.     

基于事例推理的继电保护系统智能设计方法

本系统采用了基于事例推理（CBR）与基于规则推理（RBR）相结合的方法,很好地模拟了设计专家的联想、直觉、类比、归纳、学习、记忆及演绎推理等思维过程,高效率地连贯处理了方案推理、设备选型、参数计算、数据库管理、组屏设计及绘图制表等全部设计工作。解决了继电保护智能设计的关键问题。从而使设计问题求解以一种更为智能的方式进行,将所能处理的设计范围扩大到包括施工图设计在内的全部设计领域。     

RS-485总线转USB接口微模块研制

详细介绍了基于通用串行总线(USB)专用芯片PDIUSBD12(D12)及其相关电路的硬件设计方案、转换装置微处理器AT89C52(MCU)的firmware程序设计方案、基于Windows驱动模型标准(WDM)技术的Windows下的驱动程序设计方案和基于基础类(MFC)技术的Windows下试验程序的设计方案。列举了研制工作中的难点:USB总线枚举过程的调试和Windows下WDM模式的驱动程序设计,并给出了相应的解决方案和调试经验。     

伊朗萨汉特(2×325MW)电厂电气设计特点和体会

随着我国加入WTO, 在参与全球经济竞争的大潮中, 将有机会竞争和承担国外项目的设计和服务工作, 进而在国际电力咨询、设计领域占据一席之地。为此, 需要不断积累和总结更多的涉外设计服务工作经验, 使设计逐步与国际标准和国际惯例接轨。本文仅就伊朗Sahand电厂电气部分的设计特点、设计过程和经验教训, 以及涉外合作的体会, 进行一些简单介绍回顾和小结, 希望对以后的涉外设计服务项目有所帮助。     

A Design Approach for Direct-Drive Permanent-Magnet Motors

This paper presents a design approach of a direct-drive permanent-magnet (PM) motor for a medium-sized injection-molding application. In the proposed approach, genetic-algorithm (GA) loop works to optimize the lamination design in order to meet the requirements for the target application. To achieve the design optimization within a realistic time scale, the repeated calculation required to obtain fitness evaluation does not use finite-element analysis (FEA) but consists of a geometric flux-tube-based nonlinear magnetic analysis developed specifically for this class of motors. The validity of the proposed design approach is verified through several comparative studies on the design results with FEA using a 942- 88.8-kW three-phase multipole interior PM motor, which is designed by the proposed optimizing GA approach.     

基于B/S模式的MIS设计

针对传统C／S模式的MIS难升级、难维护等诸多缺点，提出了基于B／S模式的MIS系统设计。基于B／S模式的MIS在系统安全部分、功能层、表示层中分别引入了数字证书、分布式计算、Java Applet监听等新技术。新的系统具备易集中升级、易集中维护、易与内部Intranet或外部Internet集成、安全性能好等诸多优点。从MIS系统的数据库、功能、系统安全分布式设计三个方面分别加以阐述。     

Passivity–preserving interpolation‐based parameterized model order reduction of PEEC models based on scattered grids

The increasing operating frequencies and decreasing IC feature size call for 3‐D electromagnetic (EM) methods, such as the Partial Element Equivalent Circuit (PEEC) method, as necessary tools for the analysis and design of high‐speed systems. Very large systems of equations are often generated by 3‐D EM methods and model order reduction (MOR) techniques are commonly used to reduce such a high model complexity. A typical design process includes optimization and design space exploration, and hence requires multiple simulations for different design parameter values. Traditional MOR techniques perform model reduction only with respect to frequency and such design activities call for parameterized MOR (PMOR) methods that can reduce large systems of equations with respect to frequency and other design parameters of the circuit, such as geometrical layout or substrate characteristics. We present a novel PMOR technique applicable to the PEEC method that provides parametric reduced order models, stable and passive by construction, over a user defined design space. We treat the construction of parametric reduced order models on scattered design space grids. Pertinent numerical examples validate the proposed approach. Copyright © 2010 John Wiley & Sons, Ltd.     

一次与二次结合,共创发电机优化设计新方法

通过3台发电机主保护定量化设计结果的对比,说明在大中型发电机定子绕组的初步设计中应考虑发电机中性点侧的引出方式、实际可能发生的内部故障特点和相应的主保护配置方案。发电机设计(一次)与继电保护(二次)工作的分离,存在发电机安全运行的隐患。只有发电机设计与继电保护密切合作,才有可能完成定子绕组的优化设计。     

13.2 MW海上超导直驱风力发电机设计

超导电机技术为减小大型直驱风力发电机体积、质量和成本提供了一种有效途径。提出了一种海上超导直驱风力发电机系统,其定子采用低温超导线圈产生励磁磁场,转子为常规的铜制电枢绕组。首先介绍了该电机的主要参数以及拓扑结构的选择,并分析了超导电机电磁设计过程中所需考虑的关键问题;之后介绍了超导电机的定转子设计方案,包括电磁设计、机械结构、转子风冷系统、超导定子的低温系统以及制冷系统等;最后估算了所设计超导电机的质量以及成本,并与相同功率等级的永磁直驱风力发电机进行了对比,结果表明所设计的超导电机的质量比永磁直驱风力发电机质量减轻约46%,而其初始材料成本仅为永磁直驱电机的71%。