大型高空台进排气控制半物理仿真系统设计

为构建大型复杂高空模拟试车台进排气控制半物理仿真系统,提出了仿真模型和实物部件相结合的系统设计方法。依据系统结构组成及工作机理统筹规划系统仿真模型和实物部件,利用理论建模、系统辨识方法建立仿真模型,并基于PLC完成系统设计和软件开发,最终将仿真模型和实物部件高效统一形成半物理仿真试验台。通过仿真平台实现了系统一体化虚拟仿真,结果表明系统运行可靠稳定,能够准确模拟真实发动机试车过程。     

FADEC半实物仿真平台测控系统设计

在航空发动机控制系统的研制过程中,利用半实物仿真环境开展控制系统集成试验,可在逼近真实台架试车的条件下,验证控制系统各项功能性能。在某型半实物仿真设备建设过程中,分析了设备实际需求,引入了Ethercat工业以太网技术实施测控系统构建,并完成设备建设。该平台投用后,用于多个项目研制,缩短了项目开发周期,节约了研制经费,降低了开发风险。     

某特种动力发动机控制器设计

以某特种固体火箭发动机研制为工程应用背景,基于DSP+ FPGA主协处理器方案设计了发动机控制器,安全可靠地完成了发动机转级控制,基于PID控制方案实现燃气发生器压强闭环控制.该发动机控制器完成了大量发动机地面试车试验.试验结果表明系统具有使用方便、稳定性高等特点,为该发动机的探索研究建立起了工程实用的压强控制实验装置.     

反舰导弹半实物仿真软件系统设计

仿真软件是一类面向问题、面向用户的专用软件,由于半实物仿真软件在整个仿真过程中的重要作用,使得它成为半实物仿真实验的关键,成为仿真技术研究的重要课题。在导弹控制和制导系统研制过程中,半实物仿真发挥了重要的作用。主要介绍了某型反舰导弹半实物仿真软件系统的组成及设计、具体的联调方案及动画演示系统设计。试验结果表明,该半实物仿真软件系统为半实物仿真试验的顺利进行提供了必要的保障。     

高空台进排气调压系统半物理仿真试车台

研究航空发动机性能时,仿真技术已经越来越多地应用于控制系统的研究和设计中.高空台开展进排气调压系统用半实物仿真技术研究具有重要的应用价值.介绍了半物理仿真技术在航空发动机高空试验中的作用、关键技术分析和以GE90-70可编程控制系统为平台的进排气调压系统半物理仿真试验台的建设方案.通过仿真试验与原试验结果的对比,表明了所建立的动态仿真系统的正确性和有效性,说明设计的半物理仿真试验系统能实时反映控制系统作用下的真实试车过程.     

某型飞机空中加受油训练模拟器的研制

根据加受油模拟训练的实际需求,提出了某型飞机空中加受油训练模拟器的功能,设计了模拟器的体系结构,并说明了模拟器模拟座舱、飞行仿真、伞套运动、运动平台、信号采控、操纵负荷、视景、教员控制台、计算机网络、音响通讯等分系统的实现。该模拟器采用实物与图像相结合的半实物仿真方式,空中对接环节临场感强、效果逼真,对实装飞行帮助很大,受训飞行员对该模拟器评价较好。该模拟器的投入使用,对提高仿真训练的质量效益,促进部队战斗力建设具有十分重要的价值和意义。     

紧凑型船舶动力定位控制半物理仿真系统研究

根据紧凑型船舶动力定位控制研究及设计的需求,设计了对应的半物理仿真系统。该系统建立船舶运动及海洋环境计算机模型模拟器、全尺寸控制器和全尺寸操作终端,并通过基于DirectX的三维动画模拟器进行船舶三维运动效果展示。全尺寸控制器与船舶上实际使用的控制器在网络接口、信号输入/输出接口上完全一致,以便提前进行船舶动力定位控制系统半物理仿真及验证,降低了调试成本和风险,提高在水池及海洋进行实物调试的效率。该仿真验证平台考虑了船舶动力定位控制系统实际运行环境,引入了外载荷模型,提高了仿真验证的可信度。文中给出了仿真实例,验证了系统的有效性。     

水下热动力系统半实物仿真试验系统设计

半实物仿真试验研究是水下热动力系统研究的重要手段之一.文中以某型水下热动力系统为对象,基于虚拟仪器技术设计了一种水下热动力系统半实物仿真试验系统.该系统将控制器、燃料泵等实物与计算机、信号测试设备等构成有机整体,形成半实物仿真系统.简要介绍了水下热动力系统原理,详细介绍了半实物仿真系统所采用的数学模型、测控原理及仿真软件设计.并进行了试验验证研究,试验结果表明该系统能够对燃料泵及其控制系统的动、静态特性进行全面的考核试验,系统可靠,使用方便,具有较强的实用性.     

某型涡扇发动机半实物仿真系统设计

本文研究了虚拟仪器技术在某型涡扇发动机半实物仿真系统中的应用,介绍了基于虚拟仪器技术的系统硬件结构设计、软件结构设计.该系统能完成涡扇发动机的静态和动态过程的半实物仿真实验,且具有高测试精度、高可靠性、人机交互性好等特点.实验结果表明该实验系统具有很大的实用价值,能满足科研工作的需要.     

某型涡扇发动机半实物仿真系统设计

本文研究了虚拟仪器技术在某型涡扇发动机半实物仿真系统中的应用,介绍了基于虚拟仪器技术的系统硬件结构设计、软件结构设计。该系统能完成涡扇发动机的静态和动态过程的半实物仿真实验,且具有高测试精度、高可靠性、人机交互性好等特点。实验结果表明该实验系统具有很大的实用价值,能满足科研工作的需要。     

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。     

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。