基于Boost变换器的PSM建模和分析

基于Boost变换器,利用状态空间平均法对一种新的调制模式——跨周调制(PulseSkippingModulation;简称PSM)进行建模和特性分析,推导出电感电流连续(CCM)和电感电流断续(DCM)时系统的变压比,调制度M与负载的关系以及系统转换效率的理想化公式,得到PSM是一种可采用的控制模式,尤其在轻载下具有高转换效率的结论,并设计了具有PSM调制特性的控制电路,给出实验仿真结果。     

基于矩阵式变换器电机系统仿真研究

电气传动的未来发展是电机与变频器一体化以用来减少成本，增加系统效率与可靠性。矩阵式变换器电机系统可以实现四象限运行，输入功率因数为1，没有直流环节，可运用在高温场合下，并且解决了矩阵式变换器电压传输比较低的限制。在基于矩阵式变换器矢量调制的分析上，对矩阵式变换器电机系统进行了仿真。理论研究与仿真结果表明了矩阵式变换器电机系统的可行性，解决了传统电机系统输人功率因数低、对电网有谐波污染等问题。     

模糊自校正控制器在水轮机调速系统中的应用

研究采用模糊自校正控制器来改善水轮机调速系统的性能，提出了用粗调和微调相结合的方法来调整模糊控制器的量化因子。仿真实验表明，该控制器与常规PID控制器相比具有超调量小、速动性好的特点。     

单端输出的机顶盒开关电源设计

在介绍了TOP Switch芯片的原理及特点的基础上．使用该芯片并通过对开关电源关键部件高频开关变压器中相关参数的计算设汁出了一种单端输出的机顶盒开关电源．给出了该电源在使用时的相关技术指标．为TOP Switch芯片在开关电源中的应用提供了理论和实验依据．     

Cognitive Ability, Expertise, and Age Differences in Following Air-Traffic Control Instructions.

Differences in cognitive ability and domain-specific expertise may help explain age differences in pilot performance. Pilots heard air-traffic controller messages and then executed them while "flying" in a simulator. Messages varied in length and speech rate. Age was associated with lower accuracy, but the expected Age x Message Difficulty interactions were not obtained. Expertise, as indexed by pilot ratings, was associated with higher accuracy; yet expertise did not reduce age differences in accuracy. The effect of age on communication task accuracy was largely explainable as an age-associated decrease in working memory span, which in turn was explainable as decreases in both speed and interference control. Results are discussed within frameworks of deliberate practice and cognitive mediation of age differences. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Design of an intelligent fuzzy logic controller for a nuclear research reactor

The main objective of this paper is to design an intelligent controller system based on the concepts of fuzzy logic. This latter will be used to control the power of a nuclear reactor. The principle of this controller is based on rules established from experiments used with a classical controller and from the knowledge and the expertise of the operators of the reactor. This intelligent controller could be used in parallel with the actual system, which is semiautomatic, as a decision aided system to assist the operators in the control room.     

ASTAT天车专用矢量控制器

重载起升系统是一类极为危险的系统,对驱动系统要求具有较高的安全性、稳定性。随着数字技术的发展,使各种先进的技术得以在实践中应用。ASTAT专用矢量起升控制器正是先进矢量技术、数字技术与实践相结合的产物。     

江西省科技馆楼宇设备自动化系统设计概述

结合江西省科学技术馆楼宇设备自动化系统设计,阐述楼宇设备自动化系统基本概念及设计方法。     

嵌入式液压控制器的实现

嵌入式液压控制器是在国内某大型钢铁公司的技术改造中开发的。控制器硬件采用德国MEN公司的A12高性能单板计算机,软件使用了VxWorks嵌入式实时操作系统。本文给出了液压控制器的设计方案,并介绍了VxWorks下多任务和精确周期的实现方法。