开关磁阻电机数字控制系统的研究和实现

该文介绍了以数字信号处理器(DSP)芯片TMS320F240为核心并结合现场可编程门阵列(FPGA)的开关磁阻电机调速系统(SRD)的数字化控制系统的设计。该文设计了硬件电路和软件控制策略，控制策略采用模糊算法，硬件设计采用DSP和FPGA为核心实现了开关磁阻电机调速系统的全数字化。仿真与试验均表明，本文设计的开关磁阻电机调速系统具有高效、实时、动态性能好、噪声低、转矩脉动明显减少等优点。     

基于dSPACE开关磁阻电机控制器开发方法

本文提出了一种基于dSPACE半实物仿真环境下,开关磁阻电机控制器的开发方法.通过dSPACE系统与实际驱动电路相结合,建立了开关磁阻电机控制器的开发平台,能够方便有效地实现多种开关磁阻电机控制算法.该平台的硬件部分由dSPACE系统的硬件部分结合电机的驱动电路,驱动电路根据不同的电机开发需求设计.开发平台的软件部分包括模块化建模工具MATLAB/Simulink,与综合实验和测试软件ControlDesk.通过开发平台的建立,归纳出一套开关磁阻电机控制器的开发方法.该方法在MATLAB/Simulink下建立的仿真模型通过ControlDesk在线修调参数,同时自动生成控制代码.与传统方法相比,该方法能显著的缩短控制器的开发周期,降低开发成本.     

基于DSP的开关磁阻电机的数字系统设计

介绍了开关磁阻电机驱动系统的结构及组成,研究了以TMS320F240数字信号处理器为为核心的开关磁阻电机控制系统的设计,给出了其硬件电路设计方案和软件实现策略。     

小功率开关磁阻风力发电系统模拟装置研发

分析开关磁阻电机风力发电工作原理,推导其非线性数学模型,在MATLAB仿真平台上建立基于PWM斩波和APC复合控制的开关磁阻发电系统仿真模型,进行相关仿真实验,为硬件电路设计的参数选择提供帮助。以DSP为控制核心,设计开关磁阻风力发电系统功率主电路与控制电路,实现小功率风力发电。实验和性能测试验证了设计方案的可行性与有效性。     

开关磁阻电机角度位置的纯硬件控制

针对开关磁阻电机APC方式,本文介绍了一种基于CPLD的纯硬件控制方式。该系统采用一台1KW6/4结构开关磁阻电机作为机电能量转换装置,采用EP1K30TC144-3型CPLD（复杂可编程逻辑器件）和外围电路构成数字控制器。实验结果表明,本文提出的开关磁阻电机纯硬件控制系统在实践上是可行的,基于CPLD的纯硬件控制器可获得优良的控制效果。     

开关磁阻电机控制系统仿真建模研究

基于开关磁阻电机的基本方程式,利用Madab/Simulink环境下的基本模块,搭建了一个开关磁阻电机驱动系统的动态仿真模型.可以对给定参数的开关磁阻电机的动态特性进行仿真.仿真结果证明了开关磁阻电机建模方法的合理性、有效性,为实际电机控制系统的设计和调试提供了新的思路.     

基于单片机的开关磁阻电机驱动系统设计

该文介绍了开关磁阻电机的基本原理,设计了一种用80C196单片机实现的开关磁阻电机驱动系统,并对该开关磁阻电机调速系统的性能进行了实验与测试,实验证明该系统运行可靠。     

低速直驱开关磁阻风力发电系统模拟装置研究与实现

分析开关磁阻电机的发电原理及其非线性模型,在MATLAB仿真平台上构建开关磁阻风力发电系统相应的仿真研究模型,设计一套基于DSP的低速直驱开关磁阻风力发电系统,实现低速直驱风力发电。实验和测试结果证明设计方案正确,系统运行可靠。     

基于虚拟仪器的变频调速电机电参数的测试

介绍了基于虚拟仪器对变频调速电机参数测试系统，给出了硬件设计方法、软件模块构成。提出了几种提高测试准确度的方法及其实现措施。它与传统测试方法比较，具有硬件简单、软件应用灵活、测试准确度高等特点。     

基于Cortex M3处理器的开关磁阻电机控制器设计

针对常见的开关磁阻电机控制器性能与成本难以兼顾的现状,以32位ARM Cortex M3内核的高性能微处理器STM32F103为核心,设计实现了低压开关磁阻控制器,包括处理模块、功率变换器和检测模块。采用处理器内部模块完成数字和模拟信号的采集、计算和控制信号输出,并通过三相不对称半桥式功率变换器和电流、电压、位置反馈信号实现了对三相12/8极结构开关磁阻电机的控制。测试结果满足设计目标要求。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.