中频井口电磁加热器

一种用于油井井口的中频电磁加热器。外表面缠绕电磁感应线圈的导磁钢管做为换热器的主要部件。在导磁钢管靠近出油口设置有管壁温度检测传感器和油温检测传感器,检测到的温度信号经过检测电路处理后,送给控制器,实现控制与保护。该中频电磁加热器加热速度快,热效率高,调温、控温容易。     

轴型工件感应加热温度控制系统开发

绿色高效的新时期工业生产理念的推广,使得电磁感应加热技术在近年来得到了越来越广泛的应用。电磁场和温度场的相互耦合,给电磁感应加热过程的数值模拟带来了一定困难。有限元法、边界元法等数值分析方法:先后被应用到电磁场和温度场的分析中来,但由于此类算法的复杂性使得研究结果:无法实时的给予工业生产在线指导。本文基于已有的研究结论以及感应加热的特点,开发出一套感应加热温度控制系统。首先根据电磁感应加热的电磁原理,研究分析了轴型工件感应加热过程中各种发热机理,探讨了工件内涡流功率密度在加热不同阶段内的分布规律,然后建立了感应加热温度场的有限差分计算模型,模拟了温度场的变化过程,讨论了工件瞬态温度场的分布和变化趋势,最后基于Visual Studio 2008建立了感应加热温度计算机控制系统,采用PID控制器通过调节电源功率控制温升过程,并以彩色云图的方式实时展示温度场瞬态变化趋势,并基于DB2数据库建立了相应的生产过程数据管理系统。     

多管火箭武器的瞬态耦合热效应仿真计算

针对某火箭武器发射时外部高温高速燃气流对控制柜内部换热的耦合加热问题,建立了一种求解多管火箭武器内外耦合热效应的数值仿真方法.为了精确地控制柜内的温度,保证稳定性,通过构造反映壁面外燃气流加热的壁面温度函数,将控制柜外热环境转化为浮动的热边界条件,实现了火箭武器控制柜外部热环境与内部换热的解耦计算,避免了难以实现的直接耦合求解,仿真了多管火箭武器控制柜内外的温度分布,为进一步进行火箭武器控制柜的热可靠性设计提供了依据.     

一种用于海洋沉积物加热酸化试验的超音频感应电源

海洋中的有机沉淀物热解反应后的CO₂浓度可以反映出该地区的能源分布和生态质量，所以为提高海底沉积物热解酸化实验的效率，设计了一种电压串联型，并具有移相PWM和PFM混和调功的超音频感应加热电源。利用COMSOL软件，采用磁-热耦合的仿真分析方法，对中国边缘海沉积物(ME3观测站点)加热的过程进行有限元仿真，确定了感应加热电源冷启动时电磁负载侧的热能传递过程和被加热材料的升温趋势，做出样机采集数据，绘制出待加热物质反应后的时间—温度曲线和温度—浓度曲线。实验结果证明：相较于SUNSET品牌的加热环节，加热速度至少提高50%。     

一种用于多电极电磁流量计的速度重构设计

电磁流量计在工农业及民生领域的流量计量中应用广泛,而电磁流量计的准确度主要依靠自身的测量精度而不易受介质影响.使用8电极电磁流量计,旨在从流量计的多电极电势差角度出发提高精度.基于电磁感应原理与权函数理论,提出一种改进的截面划分方法,通过COMSOL Multiphysics进行仿真,得出电极间的电势差.使用吉洪诺夫正则算法对速度矩阵进行求解,得出速度重构值.仿真与计算结果表明,该设计合理正确,仿真得到的感应电动势在截面处的速度分布符合理论分析,速度的理论值与重构值的误差不高于1.50％,显著提高了电磁流量计测量的鲁棒性与精确性.     

基于有限元模型的连铸坯感应加热过程仿真

研究连铸坯感应加热控制过程,提高电热效率和满足连铸坯轧制温度.为了能够直观、准确地获得感应加热过程的温度分布规律,采用计算机数值仿真技术对感应加热过程进行仿真.以某钢铁厂热连轧连铸坯感应加热过程为例,利用有限元分析软件ANSYS建立感应加热模型,再现了连铸坯经过两个感应器的加热过程,并获取了钢坯内部关键点的温度变化数据.结果表明有限元数值仿真与实际相符,可为感应加热装置的优化设计和智能控制提供重要依据.     

管道清堵机器人电磁定位系统

介绍了管道清堵机器人的定位原理,依据磁偶极子模型分析了管道外极低频电磁信号的分布规律,建立了管道清堵机器人一维定位方法,并设计了管道清堵机器人电磁定位系统。实验结果表明,该系统可以实现对机器人的有效定位,当接收天线分别以5 m/s和10 m/s的速度移动时,定位误差范围分别为-20.7~19.8cm和-24.3~27.1cm,完全满足工程的精度要求。     

磁力耦合机电产品电磁-结构多场联合仿真方法研究

针对磁力耦合机电产品分析和计算仅局限于单一场,无法充分反映产品电磁-结构耦合工作特性的问题,提出了一种电磁-结构多场联合仿真方法。基于结构动力学方程和麦克斯韦电磁场方程分析了激活装置输出电压,通过电磁仿真获取磁力参数,结合Adams动力学模型开展电磁-结构多场联合仿真。通过激活装置磁力矩和输出电压测试,结果表明,电磁-结构联合仿真方法计算误差可控制在5%以内。本文提出的电磁-结构联合仿真方法可提高磁力耦合机电产品计算精度,对磁力耦合机电产品性能研究具有参考价值。     

拦截弹电磁发射过程的控制与仿真

在电磁拦截系统动能优化问题的研究中,拦截弹的电磁发射过程,是一个涉及多物理场的复杂动态过程,求解困难。传统分析方法存在电磁场分析与电路分析相互孤立的问题。为提高动力性能,提出场路耦合分析方法,利用Maxwell 2D与Simplore的协同仿真对拦截弹的电磁发射过程进行了仿真研究,得到了发射过程中放电回路的电流波形、发射装置的磁场和涡流分布,以及拦截弹所受电磁力、拦截弹速度和位移随时间的变化规律。并进行了拦截弹发射实验,实验结果与仿真数据的一致性表明所建立的场路耦合模型是正确的。     

电磁热水器温度控制系统仿真设计

介绍了电磁热水器温度控制系统的设计与仿真实现方案.采用数字式温度传感器DS18B20测量水温,用按键设定所需温度,数码管显示实际温度与设定温度.当水温低于设定温度时,单片机驱动加热电路进行加热,当水温达到设定温度时停止加热.     

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。     

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.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

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.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

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     

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.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.