数字技术在飞机燃油测量系统中的应用与试验

长期以来,飞机燃油系统采用模拟式燃油测量系统进行工作,这种方式存在诸如测量和显示精度低、维护性和可靠性差等较多特点.为解决模拟式燃油测量系统的缺陷,在飞机燃油测量和指示系统中引入了数字技术,即以燃油测量与管理计算机为核心的数字式燃油测量系统.结合某型飞机燃油系统试飞,主要介绍了数字式燃油测量系统的组成、工作原理及数据处...     

某飞机环境控制计算机仿真测试系统设计

通过研究机载环境控制系统控制功能,分析环境控制系统计算机接口和需求,设计了基于Vx-Works技术的实时仿真测试系统.该系统构建了反射内存实时网络,建立了飞机环境控制系统仿真测试模型.通过管理主控软件运行流程,实现环境控制系统计算机控制功能、性能手动测试和自动测试.     

飞机交流电源特性参数测量研究

飞机机载电源系统供电品质直接关系到飞机用电设备可靠工作和飞行安全,为此,2006年国际标准组织推出了新的机载电源标准ISO1540-2006;本文根据该标准要求,提出了一种机载电源的稳态和瞬态特性的测试的实用方法;建立了测量的数学模型;采用虚拟仪器技术,设计硬件测试平台,包括功率因数可调的大功率数字化程控负载和计算机数据采集系统;基于LabVIEW开发了测试软件;为满足暂态特性的测量要求和精度要求,采用了NI高速高精度数据采集卡,实现了较高的测量精度,综合测量误差小于0.5%,并在暂态测量中,考虑了负载接触器吸合时间;该测试系统可以用来检验恒频机载交流电源的特性是否符合国际标准要求,以保证飞行安全。     

以太网在新支线飞机试飞测试中的应用

介绍了传统的飞行试验机栽测试技术和以太网在新支线飞机试飞测试中的应用,论述了机载实时监控系统的网络拓扑结构和协议设计的思路,最后简要说明了系统测试和应用情况.     

战术导弹控制系统BIT设计方法

战术导弹控制系统测试是其研制、生产和交付使用阶段的重要环节,为了快速便捷地完成对控制系统功能性能指标测试,及时检测和隔离故障,保证导弹安全、准时发射,根据新一代导弹控制系统设计特点,重点针对导弹交付后使用阶段测试需求,提出一种分布式与集中式相结合的机内测试(BIT)方案,详细给出了单机分布式BIT和系统集中式BIT的设计方法,该方法在无外部设备辅助测试的条件下可覆盖控制系统所有硬件资源,实现控制系统工作状态和工作性能的快速评估,为导弹或运载火箭控制系统测试性设计提供参考。     

基于虚拟仪器的无人机供电测试系统的设计与实现

针对某型数字式无人机机载供电系统的特点,提出了基于虚拟仪器技术的供电测试系统的设计方案。本文介绍了系统的硬件结构和软件模块,详细阐述了测试系统功能的实现。最后结合系统完成在开发环境下测试系统软件的设计与实现。     

基于虚拟仪器的无人机机载计算机测试系统

分析了无人机机载计算机测试需求，讨论了基于虚拟仪器的机载计算机综合测试系统的基本功能、硬件配置、软件设计等，给出了系统试验结果，利用该系统测试机载计算机能将故障定位至板级。     

工业控制系统电源的测试方法概述

工业控制系统的电源测试是工业控制系统测试和应用的基础工作之一,本文从工业控制系统电源测试的实际试验角度出发,按照测试电源的基本参数、功能检查、环境适应性检查以及电磁兼容性这4大类别来对电源进行测试和检验其性能指标,其中每一类别又由电源各部件或整体的性能指标和参数所组成,且一般应易于进行实际的测试评价。对工业控制系统相关的测试研究工作具有重要的参考价值。     

飞行高度环境模拟试验系统设计

机载/伞降等设备都是在高程剧烈变化环境下工作,为了在地面测试该设备性能指标,需要建立一个高程环境模拟试验系统,该系统通过模拟高空环境,实现对机载/伞降设备的试验。该试验系统由真空发生器、试验箱、控制阀门管道回路以及控制系统组成。控制系统以GD32为主控芯片,以MS5611作为气压采集部分的核心器件,通过蓝牙和Wi-Fi实现数据传输,利用PID控制算法调节阀门开度,实现对系统的气压控制。该系统硬件部分设计精简,各部分之间通讯稳定,经测试满足设计需求,符合机载/伞降等设备工作环境的特性。     

基于LabWindows/CVI的无人机燃油组件测试系统的开发

在虚拟仪器技术的基础上,对无人机燃油组件测试系统进行了设计和研究.阐述了该测试系统搭建的全过程和工作原理.采用LabWindows/CVI7.0作为该测试系统的软件开发平台,选定CompactPCI结构为本系统的硬件构成方案.试验结果表明基于虚拟仪器开发的无人机燃油组件测试系统能够满足工程和测试技术的要求.     

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。     

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.     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.