舰载装备便携式高精度振动监测系统的设计

振动对武器装备的可靠性有着重要影响,针对舰载装备缺乏全寿命振动数据监测设备的困境,以PC104总线、高精度振动传感器和电源管理技术为基础研制了一款高精度、便携式、低功耗舰载装备振动检测仪,并与安装数据分析软件的下位机一起构成振动监测系统。应用表明,该振动仪具有分辨率高、功耗低、安装简单、方便携带等优点。通过对舰载装备全球海域、全时段的振动监测,获取了典型海况下,舰载装备的振动数据,在现役装备的可靠性分析及新型装备的可靠性设计方面发挥了重要作用。     

武器装备测试数据立方体模型的构建

针对大规模、高频率数据交换的实际需求,结合武器装备测试数据的特点,构建了装备测试系统的数据立方体模型;首先介绍了数据立方体的基本概念以及常用的基本模型,之后分析了装备测试系统的实际需求,以概念模型、逻辑模型以及物理模型三级数据模型的方法实现整体设计;数据立方体为装备测试数据提供多维的观测角度,满足了实际任务对高效率数据交换的要求,为之后的数据分析应用提供了良好的数据基础平台.     

面向产品状态的工装建模技术研究

为了在工艺装备设计过程中,提前考虑后续制造、使用、维护的相关需求,确保工艺装备在使用过程中对武器装备状态更改的及时响应;在分析工装生命周期特点的基础上,总结了面向产品状态工装模型的要求,提出了面向产品状态工装模型的定义,着重指出了工装模型与产品模型的关联关系;最后介绍了面向产品状态工装模型响应武器装备状态改变的实现方法。     

LabVIEW在起落架落震试验测试系统中的应用

设计了一套适用于飞机起落架落震试验的测试系统,系统软件采用LabVIEW、Matlab编程技术,实现了对试验测试参数的采集、显示、分析、存储及试验结果、试验曲线的输出.经试验验证,该系统自动化程度高,运行稳定,数据分析误差小,完全满足落震试验中数据采集和数据分析的功能要求.     

一种装备维修辅助系统设计

提出了一种便携式装备辅助维修系统的设计方法,从硬件及软件两个方面详细阐述了辅助维修系统的设计;该系统具有开放性的特征,可任意完成多种装备维修信息的录入和导出,具有电子教材、故障诊断、维修指导、工况信息读取、保养检查、器材管理等功能,该系统硬件上具有抗冲击振动、耐高温低温、操作简单方面,符合部队的野外使用需求;该系统软件采用开发式的基于工作流的结构设计,可任意添加不同装备的故障诊断、维修指导流程,可以完成多种武器装备辅助维修等特点。     

SPVT系统的框架结构研究

目前,由物理模型、数值方法和可视化技术相结合而发展起来的仿真技术,受到广泛的重视,正在迅速发展.在振动工程界,利用计算机技术将振动试验与计算机仿真技术集成在一起也是一个追求的目标.虚拟振动仿真系统SPVT（Simulation Platform of Vibration Test）,是在对振动环境试验和振动环境试验的数值仿真分析的研究基础上,研制的具备试验项目管理、数据信息处理、试验控制、振动分析、夹具设计、模型修正、试验再现等多种功能的集成化系统.该系统基于分布式异构网络,以项目管理为核心,实现仿真自动化,为振动环境试验的发展探索出一种试验与计算机仿真相结合、相互促进的新途径.该文介绍了系统的框架结构和实现该结构的关键技术.     

超声悬浮及转子振动抑制理论与实验研究

超声悬浮技术可以实现悬浮和减摩功能,减少转子与静子之间的摩擦,而且由超声波产生的悬浮力可以不受悬浮物材料的影响.首先,根据流体动力学推导出超声波挤压膜的基本方程,对其进行理论推导并利用高阶差分方法进行仿真求解;针对气膜力与悬浮间隙、超声波振幅、气压、超声波频率因素的关系进行了分析,讨论了不同参数对超声悬浮性能的影响规律.然后,通过平面气膜力分解与合成推导出凹面气膜力,并研究了转速对其悬浮力的影响.将其施加在不平衡转子系统中,对转子系统的振动响应进行数值仿真,并对各个情况下的结果进行对比,探讨出不同参数下的振动抑制效果.最后,设计了超声悬浮-转子系统的实验台,通过实验测试不同参数下转子系统的振动响应,验证超声悬浮技术对于转子系统的振动抑制作用.     

基于仿真的装备论证

建模仿真技术是实现武器装备论证的重要手段之一,利用建模仿真技术定量评价武器系统和武器装备体系已成为一种科学活动、专业和研究领域.文中提出了装备论证的概念,分析了用于装备论证的建模仿真系统特点.探讨了将建模仿真技术应用于武器装备论证所面临的技术问题.提出了基于仿真的武器装备论证的关键技术:利用从作战到装备的需求分析建立从军事策略到装备作战任务;装备评价指标体系;模型层次结构及数据流;建模仿真结果的显著性分析.     

基于有限元分析的重型装备空投系统匹配和评估

针对采用实装试验研究空投装备着陆缓冲过程的方法难以得到有效结果的问题,采用非线性有限元分析方法,结合气体热力学理论,建立重型装备空投系统解析模型和非线性有限元模型,结合试验数据验证模型的有效性和精度.在分析重型装备空投着陆缓冲过程的响应特性基础上,采用拉丁超立方试验设计方法和移动最小二乘法构建响应面模型,结合环境条件的统计规律研究空投系统的匹配和评估方法.分析高海拔条件下空投过程中存在的问题,给出其发生机理并提出解决方案.     

航天器电子元器件疲劳寿命分析

为研究空间环境效应对航天器电子设备元器件疲劳寿命的影响,应用Miner累积损伤理论及三带宽技术,根据表贴元器件经历的试验、发射和在轨运行等实际环境进行振动及热疲劳寿命分析．给出振动及热循环疲劳寿命的计算方法,并以某BGA（Ball Grid Array）器件为例进行分析．该方法可为长寿命、高可靠的航天器电子设备抗力学及热设计提供分析途径．     

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。