一种卫星半实物模拟训练等效器的设计与实现

由于在实装上进行卫星地面测试的日常训练可能会造成设备的严重损耗,不能用真实卫星作为日常训练对象。通过分析大量卫星的供配电特性,设计半实物供配电设备模拟器,用其代替真实部件引入闭环回路,实现卫星内部供配电分系统的实物等效。以计算机为核心实现数据采集及数据处理系统,并可实时接收遥控指令、模拟生成遥测数据,配合地面测试系统响应测试流程。硬件实物仿真设计了数据采集、信号产生等硬件板卡,实现配电等效、指令等效、测量等效的功能。模拟器整体设计以PXI总线为接口,满足了系统的模块化及通用化设计,可方便实现其他模拟器的组合及扩展。经过现场运行表明及用户实际测试表明,该设备可完全替代卫星供配电分系统实现卫星电气性能模拟,有效配合地面测试人员的日常训练。     

基于PXI总线的无线电罗盘信号模拟器设计

无线电罗盘信号模拟器可用于无线电罗盘接收机的检测与维修。为方便携带与系统集成,本文按照合成仪器设计思想,采用标准总线与软件无线电的开放式体系架构,设计出一种基于PXI总线、便于集成、小型化的无线电罗盘信号模拟器。该模拟器可方便应用于机载无线电罗盘的现场维修测试,特别是外场维修检测,提高设备的外场保障能力。     

基于PXI总线的装甲车辆武器测试系统的设计

基于VXI、PXI总线进行各种自动测试系统的开发是目前国际国内较为流行的故障检测诊断方案,文章介绍了一种基于PXI总线的装甲车武器系统自动测试系统;简要说明了PXI系统总线,该系统以PXI內嵌主控计算机为核心,以PAWS的软件为开发环境,基于硬件系统的模块化设计,软件系统利用多线程技术对实时测试系统软件进行了设计和实现,并综合运用标准接口及总线技术、故障诊断技术等来实现系统的综合设计;经验证其有效地提高了系统的可靠性、灵活性,通过实际测试与评估,证明该系统设计方案切实有效。     

一种基于工控机的飞控系统模拟器

本文提出了一种基于工业控制计算机开发的某型无人机飞控系统模拟器,详细描述了系统的功能及结构配置,提出了硬件实现方案,并给出了软件模块功能、流程以及实时性的解决方法。该模拟器可用于无人机系统先期设计验证及系统联试。     

PXI总线技术在虚拟仪器中的应用

介绍虚拟仪器和PXI总线的基本内容,以及基于PXI总线的虚拟仪器的组成要素和设计,阐述其优劣势和已投入应用的相火产品,并对其发展进行了展望.     

基于PXI的卫星综合测试系统的设计与实现

在卫星的设计制造过程中,对卫星的各个单机及整星进行大量的测试是一个非常重要的环节,传统的测试系统往往功能单一,且存在精度低、体积大和兼容性差等缺陷;PXI总线是PCI在仪器领域的扩展,虚拟仪器软件体系结构更是通过软件编程的方式对测试仪器进行了丰富的扩展,文中在对基于PXI的测试系统的硬件结构和软件编制进行了可行性研究和论证后,提出了一种基于PXI的卫星综合测试系统的设计方案,并结合某型号卫星的测试需求进行具体的项目开发;实践表明该方案具有结构灵活、体积小、测量精度高和抗干扰能力强等优点。     

基于PXI总线的海防雷达检测平台设计

PXI总线海防雷达检测平台是将基于PXI总线的虚拟仪器技术应用于某型海防雷达检测的首次尝试;针对该类型雷达的测试需求以及系统开放性、可扩展的要求,设计研制了一套基于PXI总线的检测设备;详细说明了基于PXI总线的海防雷达检测平台的硬件构成和软件设计方法,并阐述了组建雷达检测系统过程中重点、难点和实现方法;该系统可有效地解决海防雷达的检测诊断问题,常见故障正确定位率可达90%,提高了雷达装备的保障水平.     

基于PXI总线的海防雷达检测平台设计

PXI总线海防雷达检测平台是将基于PXI总线的虚拟仪器技术应用于某型海防雷达检测的首次尝试;针对该类型雷达的测试需求以及系统开放性和可扩展的要求,设计研制了一套基于PXI总线的检测设备;详细说明了基于PXI总线的海防雷达检测平台的硬件构成和软件设计方法,并阐述了组建雷达检测系统过程中重点、难点和实现方法;该系统可有效地解决海防雷达的检测诊断问题,常见故障正确定位率可达90%,提高了雷达装备的保障水平.     

卫星姿轨控半物理仿真测试系统

为了保证卫星发射前的地面姿轨控半物理试验的顺利进行,研制了姿轨控分系统半物理仿真地面测试系统。为了满足相关类似卫星型号的通用化测试,本套仿真测试系统采用通用模块化的设计架构,同时采用现今主流的PXI总线测试技术（配合VPC转接电路板）。使用标准通用cPCI总线板卡以及部分自制FPGA可编程cPCI总线板卡实现各测试模块的功能。这种架构不仅能实现功能模块化,便于后续的功能扩展及维修,同时具有可靠性高、搭建时间快、可维护性强的优点,且体积小,稳定性强,能适应不同测试对象的测试环境条件,适合长途运输。本文介绍了系统的总体设计结构,重点介绍了模拟总体电源、动力学仿真机、电信号源、程序加载以及外围设备等硬件系统功能,以及相关配套软件的基本功能。测试系统经过与卫星的星地联试,功能性及使用性均得到了验证,测试结论符合设计之初功能性及通用化的构想。     

飞机大气数据系统实时模拟器设计与实现

针对某型飞机大气数据系统在地面静态条件下无法正常输出参数、难以与其他机载系统进行动态联试的问题,提出通过研制大气数据系统模拟器实现动态联试的方案,利用多线程和精确定时等方法提高模拟器的实时性。实验证明,该模拟器可以满足系统动态联试的要求。     

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate