基于LabWindows/CVI的飞机电负载系统设计

在飞机试飞定型过程中,为了验证飞机的电源系统、APU电源系统的功能和性能在满载及超载情况下是否满足有关设计要求,需要研制电负载系统,提取并消耗发电机的剩余功率。系统由控制子系统、负载子系统和补水排水子系统3个模块组成。以PLC为下位机,上位机以LabWindows/CVI为开发平台,配合高速数据采集卡组成的控制子系统具有高可靠性、高采集精度、高控制响应能力等特点。实验表明,该系统运行稳定可靠,控制效率高,并在试飞中获得了良好的效果。     

A320飞机电源检测与负载配电系统设计

A320飞机电源检测和负载配电系统由飞机电源检测部分和负载配电部分组成。飞机电源检测部分采用STM32F4系列单片机,完成对输入交流电压、电流、频率等参数的检测、逻辑控制以及电网保护等;负载配电部分虚拟实际飞行阶段、飞行状态,通过分析负载需求,完成飞机负载配电控制和状态监控。所设计的系统可以实现飞机电源系统运行动态模拟,具备真实性强,可操作性高,可维护性好等特点,不仅可作为航空维修教学训练平台,还可为电源系统附件维修提供维修方案,应用前景良好。     

基于CAN总线的飞机重心自动调节系统设计

在飞机试飞过程中,为了验证不同重心状态下飞机的可操作性和稳定性,提出了基于DSP的CAN总线重心自动调节系统设计方案.该系统的设计利用通信速度较快的CAN总线技术,提高了系统通信的稳定性和效率,同时减少了系统的布线和负载.实验表明,飞机重心自动调节系统达到了飞机试飞的要求,为以后的飞机试飞打下了很好的基础.     

基于模糊控制下的飞机电源系统过载保护研究

当飞机发电机出现过载时,电源系统中的过载保护子系统将断开一些负载,以保证发电机安全工作,为提高电源系统工作稳定性,降低电源波对用电设备造成不利影响,需采取反延时通断控制技术进行过载保护控制,要有效实现反延时通为控制,关键问题就是如何确定出最佳延时时间,本文通过采取模糊控制理论和技术来确定最佳延时时间,以提高电源系统供电品质和眨长发电机使用寿命,使得电源系统过载保护控制更具有智能性、先进性。     

飞机三级式发电系统建模与仿真

在飞机电源系统的优化设计中,飞机发电系统为机载用电设备正常工作提供条件,而在负载发生突变情况下能否快速做出反应以保证供电质量和可靠性能,直接影响到飞机的性能.为保证可靠性,分析了飞机三级发电系统组成结构和工作原理,建立飞机发电系统仿真模型的基础上,设计了用于调节电能质量的控制器——调压器,在MATLAB/Simulink环境下建立整个系统的模型,并对飞机发电系统部分进行动态仿真.仿真结果表明,能较真实的反应飞机电源系统的动、静态性能,证明所建立的模型是正确的,采用的方法是可行的,为飞机电源系统的设计提供有效的研究手段与参考依据.     

飞机自动配电管理系统设计

飞机配电系统是现代飞机的一个十分重要组成郜分,做好这项研究工作可以提高飞机的供电质量、飞机完成任务的概率以及飞机自身的安全性,减少体积重量及全周期费用,使我国飞机配电技术上一个新台阶;对某型飞机电气负载自动管理技术进行了系统研究,提出了一种电气负载管理优先级设置方法,建立了电气负载的控制方程和电气负载的电源请求方程;系统试验表明采用负载自动管理技术大大提高了飞机供电系统的可靠性和可维护性.     

基于LabVIEW的飞机电源地面试验测试系统

为了检验飞机电源的供电品质是否达到国家标准,设计了一套基于虚拟仪器技术的通用飞机电源地面测试系统。本文介绍了系统的硬件组成和软件的实现。该系统在中国试飞院运行,效果良好。     

飞机电气负载管理系统设计

飞机配电系统是现代飞机一个十分重要的组成部分,做好这项研究工作可以提高飞机的供电质量、飞机完成任务的概率以及飞机自身的安全性,减少体积重量及全周期费用,使我国飞机配电技术上一个新台阶.对X型飞机电气负载自动管理技术进行了系统研究,提出了一种电气负载管理优先级设置方法,建立了电气负载的控制方程和电气负载的电源请求方程.系统试验表明采用负载自动管理技术大大提高了飞机供电系统的可靠性和可维护性.     

飞机三级发电机的建模与仿真

研究飞机电源系统供电优化问题,飞机交流发电系统多采用三级式无刷交流同步发电机,由永磁发电机、交流励磁机和主发电机组成.为了仿真飞机三级发电机,在介绍三级同步发电机结构的基础上,通过派克变换在dq0坐标系下,建立三级发电机的动态数学模型,在Saber软件平台下使用MAST语言编写同步发电机模型,结合调压器及电气负载得到三级发电机的部分动态仿真结果,仿真结果能够很好地显示三级发电机对不同负载的响应,证明了模型的正确性,为飞机电源系统的设计提供了一个有效的工具.     

机载网络化测试系统框架设计技术研究

随着现代飞机的不断发展,尤其是大型飞机的发展,飞行试验要求测试的参数种类和数量越来越多,数据传输量越来越大.为了满足新一代飞机试飞快速发展的测试需求,构建网络化机载测试系统,实现测试系统间数据的海量传输,各个子系统之间的交互以及网络数据融合是一个发展的趋势.但是在一个大型的机载网络测试系统设计中,如何考虑测试系统测试参数的实时性、同步性和可靠性是试飞测试工程师将面临的全新挑战.     

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。