数据采集卡在内燃机性能监测与故障诊断中的应用

针对内燃机在线性能监测和故障诊断的需求，利用PCL-818HD数据采集卡完成了内燃机工况参数数据采集系统的硬件设计，整个系统由便携式工控机、数据采集卡、传感器及其调理电路等部分组成。介绍了基于VB和DLL技术的Windows环境下数据采集程序的编制。该系统能实现对内燃机启动系统、供油系统和振动信号的高速采集，为分析内燃机性能状态并进行故障诊断提供了保证。     

基于LabVIEW的便携式频谱分析仪设计

本文针对航空发动机振动信号,介绍了利用PCIO4数据采集模块和虚拟仪器技术研制的便携式频谱分析仪的设计方法.实际使用表明,本文介绍的方法具有开发效率高、可靠性好的特点.     

基于XLP技术的超低功耗数据采集系统设计

针对目前便携式气体浓度数据采集仪体积大、功耗高以及功能单一等缺点,采用Microchip公司基于XLP技术的低功耗器件—PIC16F193X设计了一款多功能、小体积、低功耗的便携式数据采集仪。本文首先分析了整个系统的硬件低功耗设计原理,然后针对系统的低功耗特点,进行了低功耗的软件程序设计。整个软件采用了基于有限状态机的设计,最后对整个系统进行了低功耗特性测试,测试结果表明采用这种设计方法比传统的设计方法能延长便携式数据采集仪的工作时间6倍以上。     

流水线技术在高速数据采集中的应用

针对高速数据采集的特点,分析了流水线技术在高速数据采集中的应用;提出了基于CPLD+FX2高速便携式数据采集系统设计方案。通过CPLD进行高速数据采集的流水线控制,实现了低主频系统的高速实时同步数据采集。实践表明,该设计电路简单,可靠性高,容易移植。     

超声波液位测量系统中高速数据采集卡的设计

以复杂环境下超声液位测量系统为背景．论述了该系统中高速数据采集卡的功能和结构．并详细介绍了该高速数据采集卡各单元部分的设计方法。以高速间隙式采样获取超声信号，使用内存映射技术读取和处理超声信号。     

基于ARM9和Linux的机械故障诊断仪的设计

针对机械早期故障的特点,设计了一种基于ARM9微处理器和Linux操作系统的便携式机械故障诊断仪。数据采集模块采用共振解调技术和24位高速A/D转换器AD7760,通过GPRS或以太网实现与远程监控系统的实时数据传输。采用基于形态提升小波的自适应多尺度算法对振动信号进行放大、降噪、自适应多尺度滤波,提取出微弱的冲击信号。通过故障轴承的实例分析,表明该诊断仪的诊断结果具有较高的可靠性。     

基于USB接口和I~2S总线的控制系统设计

指出便携式是数字化仪器的发展方向之一,介绍了一种便携式控制系统的设计实例。给出了一种基于USB接口和I2S总线的控制系统的结构并予以实现,主要介绍了控制系统的数据采集部分。数据采集部分采用AD7862芯片,具有高速的数据采集能力,可编程逻辑CPID的采用,使得系统具有较强的可扩展性。其设计思想不仅可以用在A/D变换上,同时也可以用在D/A、数字I/O等控制场合。     

TUSB3200和I2S总线在小型实时控制系统中的应用

介绍一种便携式小型控制系统的设计实例,便携式是数字化仪器的发展方向之一.给出了一种基于USB接口和I2S总线的小型控制系统的结构并予以实现,主要介绍了控制系统的数据采集部分.数据采集部分采用AD7862芯片,具有高速的数据采集能力,可编程逻辑CPLD的采用,使得系统具有较强的可扩展性.其设计思想不仅可以用在A/D变换上,同时也可以用在D/A、数字I/O等控制场合.     

基于CH378的便携式高速数据采集系统设计与实现

针对数据采集系统在速度、容量和体积方面的需求,文中提出了一种基于FPGA的便携式高速数据采集系统方案,采用可充电锂电池作为供电电源,采用FPGA控制读写大容量Flash数据作为高速数据缓冲,控制USB接口芯片CH378完成对U盘的读写操作,实现大容量数据的可靠和便携存储;详细介绍了该测试系统的设计背景、硬件电路的设计依据、固件程序的设计思想和测试系统的具体实现;实验结果表明,该系统具有成本低、通用性强、可靠性高、便携式操作等优点,能够实现数据的高速采集,海量存储,实现了脱离计算机直接存储数据至U盘的功能。     

基于CPLD的超声液位测量中采集卡的设计

超声波液位测量在近几年已得到广泛应用,以复杂环境下超声液位测量系统为背景,论述了该系统中高速数据采集阵的功能和结构,设计了一种基于CPLD的采集卡硬件平台,此设计利用CPLD的高集成性、硬件可重复编程性,使系统的设计过程更加的合理、紧凑和简化,并详细介绍了该高速数据采集卡各单元部分的设计方法.以高速间隙式采样获取超声信号,使用内存映射技术读取和处理超声信号.     

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.     

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     

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.