基于LabWindows/CVI的导弹舵机测控系统设计

舵机是导弹控制系统的重要执行机构,为实现对电动及气动多种型号导弹舵机性能的测试,设计开发了一种基于LabWindows/CVI虚拟仪器的测控系统。介绍了该测控系统硬件组成和软件结构流程,软件设计过程中充分利用多线程、数据库等技术,准确快速完成舵机自动化性能测试。应用结果表明:该舵机测控系统工作稳定,测试精度和自动化程度高,满足舵机试验测试精度和技术指标要求,为舵机的性能研究和维修维护提供了良好的测试环境。     

自主式液压舵机测试系统设计研究

自主式液压舵机是某型飞机操纵系统的关键部件;为提高其性能测试过程的自动化程度和测试精度,设计开发了以计算机为核心、虚拟仪器技术为基础的自主式液压舵机性能测试系统;首先进行了测试系统的总体设计,然后研究了基于LabWindows/CVI的测控软件设计,最后进行了试验研究;试验结果验证了测试方案的可行性以及测试系统的有效性和可靠性.     

舵机自动测试系统的设计与实现

为更灵活准确的测试舵机性能和寿命,研制了基于工控机、力矩加载器、力矩传感器、角度传感器的舵机性能和寿命自动测试系统。测试系统采用NI公司生产的便携式一体化PXI机箱和高精度多功能采集卡,在测试过程中实时监测采集舵机控制器的电压电流和舵机位置信号;采用Lab VIEW编程平台开发了相应的测试软件,设计了友好的人机交互界面,实现了舵机产品的参数测量及合格性判断。通过实验比对新旧测试系统对同一舵机产品测试数据,证明新测试系统测试精度和测试效率都更高。     

电动舵机通用测试系统设计

舵机系统是一个高精度的位置伺服系统,是导弹控制系统的重要执行机构。电动舵机系统的测试是对舵机系统质量及技术性能进行综合评价的重要环节,是舵机系统投入使用前的重要工序。为了测试应用不同通信协议的电动舵机系统性能,基于MATLAB/GUI平台,设计了一种针对异步串行通信协议都适用的测试系统。通过对人机界面的操作,主要实现对舵指令、数据长度以及校验方式等不同的帧封装,从而实现对电动舵机的测试,并接收来自电动舵机系统反馈的舵偏角信息,将舵指令和舵偏角进行综合处理,以得到舵机系统的性能。此外,还对测试系统的性能进行了评估测试。测试结果表明,测试系统能满足通用测试要求,且便于更改和携带。     

基于LabVIEW的某型舵机综合性能测试系统

某型新研舵机性能需要严格而有效的测试;利用LabVIEW平台,开发了一种舵机综合性能测试系统;整个系统基于PXI总线进行构建,以保证系统测试的精确性和可靠性,能够产生对舵机的控制信号,同时实现数据的采集和存储,波形的实时显示,测试数据的分析、保存和打印等功能;该系统已应用在某型舵机性能测试中;试验结果表明,该系统操作方便,运行稳定,测试结果精确可靠.     

舵机综合性能测试平台的系统实现

舵机是导弹控制系统的重要执行机构,为实现对空空导弹用各种舵机空载和加载性能的测试.建立了一个通用化的舵机综合性能测试平台;系统借助通用化测试仪器,通过局域网和GPIB总线,结合VMIC内存反射网,进行多个测试单元的同步测试,采用根据预先设定的任意载荷谱,进行舵机非线性旋转加载和直线横向力加载的电动加载方式,准确快速完成各种舵机综合性能测试;具有测试精度高、覆盖性广、通用性强、易扩展升级和全程自动化测试的特点,为舵机的性能研究和设计改进提供了一个良好和完整的测试环境.     

基于单片机和PC机的电动舵机自动检测系统

DCD-2型电动舵机是无人机飞控系统的关键部件,其装机前的性能检测是确保无人机实现自主飞行的不可缺少的环节,然而,传统的人工测试方法检测人员劳动强度大,工作效率低下,测试设备老化陈旧,为改变此种落后情况,同时亦为提高部队机载设备的自动化检测水平,设计了基于单片机和PC机的的电动舵机自动测试系统;该系统集成了当前测控领域诸多先进技术,经过实践检验,该系统具有自动化程度高、操作简便、工作可靠等优点;下文主要描述了该系统的结构、硬件组成和软件设计情况。     

基于ARM处理器的舵机半实物仿真系统的实现

导弹舵机是导弹制导与控制系统的执行机构环节,其半实物仿真系统亦是实现导弹制导与拧制系统半实物仿真验证平台中的关键环节;文中针对某型导弹舵机的动态特性与控制参数,设计一种基于ARM微处理器的舵机半实物仿真系统的实现方法;首先使用simulink工具箱对对导弹舵机的模拟系统进行数学建模以及相关控制参数优化计算;最后,通过ARM控制器的硬件电路实现舵机的半实物仿真系统的硬件平台,以及嵌入式软件编程实现舵机性能模拟;根据舵机半实物仿真系统与自动驾驶仪之间联合测试结果表明,舵机半实物仿真系统可以在导弹制导与控制系统半实物仿真验证平台中替代真实舵机.     

冲压式舵机动态特性测试系统的研制

为了在实验室条件下模拟冲压式舵机的舵面在空中所受的气动载荷,实现舵机系统动态性能指标的综合检测,设计了基于PXI总线的舵机动态测试系统,工作过程中对舵偏角信号、工作电流信号、扭矩信号进行实时采集、显示,并配合测试流程完成对舵机动态性能的测试。设计中重点考虑了定刚度加载系统的小扭矩加载精度、小转动惯量以及同轴度问题。实验结果表明,该测试系统测试精度高、使用维护方便,满足要求。     

基于虚拟仪器的电液舵机测试系统

为减少电液舵机的测试时间,减小测试对舵机的损伤,提高舵机的测试效率和精度,提出了以虚拟仪器为基础,设计了一套集机械、液压、电气以及计算机为一体的工业测控系统,硬件由工控机、PCI采集板卡、通讯总线、泵站和PLC控制柜、电气控制柜等组成,软件在LabWindows/CVI环境下编写,采用RTX实时系统、多线程处理和TDMS等核心处理方法,实现了对于某型电液舵机性能指标的自动化测试,试验表明系统运行稳定,测试结果准确可靠。     

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.     

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     

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.     

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.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。