卫星供配电测试设备信号调理技术

卫星供配电测试设备通过脐带电连接器与卫星接口,实现对卫星供配电控制、供电参数测量以及状态监视,能满足卫星在各阶段和各种试验场合整星测试任务的要求.确保供电控制的可靠、测量的准确、状态监视的正确以及被测试卫星的安全是对测试设备的基本要求.对供配电测试设备和卫星之间的不同类型的信号调理技术加以论述,并选择有代表性的示例给出了参考电路图和说明.     

一种飞行器电缆插接状态自动化检测方法

新一代飞行器的电气系统越来越复杂,依靠主观识别方法检测电缆插接状态,人工失误轻则烧毁星上设备,重则导致任务失败；提出一种飞行器电缆插接状态自动化检测方法,通过插接状态检测编码和信号变换设计,确保检测电路占用尽量少的电连接器资源和背板资源；通过信号走线优化设计,避免检测电路增加电缆分支数,降低电缆加工和敷设成本；通过电源走线优化设计,确保测试电路与星上电路隔离；文章方法无需飞行器加电即可自动检测电缆插错、漏插等问题,提高了飞行器综合测试的安全性和可靠性。     

卫星星座综合测试系统研究

卫星星座等多星并行研制生产带来了多星并行综合测试的新课题.介绍了一套卫星星座模式下的综合测试系统,该系统由总控设备和各分系统专用测试设备组成,通过标准网络和通信协议形成统一指挥和调度的卫星电气综合测试体系.详细介绍了系统的总控设备以及各分系统专用测试设备,并分析了地面综合测试系统的信息流.该系统可靠性和可扩展性程度高,为多星并行综合测试系统的模块化、通用化和系列化提供了一个有效的参考,满足了卫星星座多星并行综合测试的需要.     

飞行器供配电系统地面通用测试接口设计

供配电地面测试负责为飞行器提供模拟供电、控制状态切换、采集并传输系统状态信息,配合完成全飞行器全周期的综合测试任务;飞行器与地面测试系统之间接口复杂,各项目接口方式也不统一,导致测试系统中专用设备比例仍然很高,设备继承性和互换性不强,研制费用高;首先简要介绍了供配电地面测试系统的基本功能和设备组成,明确各组成部分之间的能源流和信息流,然后对供电、控制、测量的典型接口电路进行分析,从实现方式上进行简化和归类,最后提出基于先进背板总线架构的模块化板卡方案实现测试设备的接口通用化设计;经实际产品研制和系统测试,能够满足飞行器从综合试验到靶场测试发射的全生命周期测试需求,已在两个项目中实现产品共用,经济效益明显,为电气系统地面测试设备通用化研究提供了支撑。     

小卫星综合测试供电安全性探索与实践

卫星综合测试供电安全贯穿于卫星的整个测试周期,面对众多功能特性不同的单机,避免因低层次问题引起用电设备发生故障,一直是航天质量管控的工作重点;为了实现提升小卫星综合测试供电安全的目的,结合卫星研制过程中遇到的具体问题,对常见的测试关键工序中的制约因素进行了归纳分析,并且需要将这些限定条件落实到操作规范中;对卫星母线电压建立方式和建立时间进行了研究,采用了方阵模拟器外电升电及控制母线建立时间小于300 ms,可有效防止设备启动故障;采用了蓄电池包的优化设计和配电器短路故障自检功能设计,彻底解决了带电操作的安全性问题和卫星研制全周期防短路检测问题;经过实际应用所述方法能够大幅度减少卫星在综合测试遇到的供电安全性问题,满足卫星大批量生产和研制的工程应用需求,为卫星供电安全设计提供参考。     

便携式无线电综合测试系统设计

无线通信设备装备数量大、种类多,开机时间长,因此需定期维护;针对修理过程中,性能指标的测试项目多,维修人员任务重的问题研制便携式无线电综合测试系统;首先进行便携式无线电综合测试系统的总体设计;其次介绍综合测试系统的软硬件平台实现方法,包括测试资源硬件参数配置及选型、测试执行软件平台设计技术、通信装备自动测试方案和实现技术;最后对便携式无线电综合测试系统的试验结果进行分析;应用结果表明:该系统能实现无线通信设备收发信机整机主要参数的测量,操作流程简单,大大降低了性能指标测试环节对操作人员的专业水平要求;测试的结果数据由计算机进行有效的统计、处理、分析和查询,提高了测试效率。     

综合测试设备自检模拟器的设计与实现

综合测试设备自检模拟器是综合测试设备自检测的配套设备;综合测试设备在测试导弹之前,要先进行综合测试设备自检测;在综合测试设备自检测时,自检模拟器与综合测试设备对接,对综合测试设备综合检测及单项检测的总线接口和非总线接口进行检查,以验证综合测试设备自身的正确性;讨论了综合测试设备自检模拟器的设计与实现,主要探讨了自检模拟器设计、硬件开发、软件开发以及整个自检模拟器工作过程和功能;应用结果表明将该自检模拟器和综合测试设备交联,可以完成综合测试设备的自测试.     

航天器综合测试中的接地技术研究

航天器综合测试中,航天器及地面测试系统的正确接地是航天器安全保证和抑制干扰的关键环节之一,有必要对其进行正确的认识;介绍了接地系统的构成和作用,论述了正确接地方法的重要性以及基本的接地要求,详细描述了航天器综合测试环境中测试场地和供电系统的接地布局,分析了航天器本身及测试仪器设备、电缆的接地特点,给出了航天器与地面测试设备接地系统的正确连接原则,提出消除接地干扰的建议,并且制定了切实可行的安全保证措施。     

基于单片机AT89C51的7只LED显示十进制数码的设计与实现

笔者利用单片机引脚输出信号驱动多个指示灯,控制设备的显示状态,进一步掌握了单片机对端口输出电平的控制。控制程序设计完成后,一方面可以通过Proteus软件仿真测试控制效果;另一方面可以通过烧写单片机芯片,在硬件电路上测试控制效果。通过仿真和硬件验证,旨在加深对单片机控制系统硬件电路的认知,同时也可熟悉和强化控制程序的设计。     

基于单神经元PID控制器的压电陶瓷控制方法

卫星地面综合测试是卫星研制过程中的重要环节,对系统功能验证及性能评估具有重要作用。传统的卫星地面综合测试系统存在研制周期长、投入较大、自动化流程不够完整、可重用性较差等不足。而北斗导航卫星地面综合测试系统采用分布式、高实时性、可配置、多主机的集成体系结构,是集计算机通讯、实时控制、实时数据处理、事后分析等功能于一体的测试系统,适用于从卫星总装集成到发射各个阶段的电气测试。通过卫星系统级的各项接口、功能、性能指标测试,表明该系统满足支持系统论证、状态确认、问题排查等测试需求,有力支撑了北斗导航卫星的成功发射和在轨运行。     

Evidence-based recommendations for building better bras for women treated for breast cancer

Participating in exercise is beneficial for women who have been treated for breast cancer. However, not being able to find a comfortable exercise bra can be a barrier to exercise participation. This study aimed to systematically investigate what breast support women treated for breast cancer want when they exercise in order to provide evidence-based recommendations to improve exercise bra designs for these women. Based on 432 responses from a national online survey, frequency and relationship data were analysed (binary logistic regression) to understand exercise bra issues pertinent to this population. These issues included being able to control for asymmetrical cup sizes, managing heightened skin sensitivity, managing fluid (size) fluctuations, managing a prosthesis and restoring body image by restoring shape. This study provides evidence-based recommendations to inform an exercise bra design that will meet the unique needs of women treated for breast cancer. Rigorous, evidence-based evaluations of exercise bras for women treated for breast cancer may contribute to their well-being and quality of life through enhanced designs.     

一种SIP穿越NAT的解决方案

NAT使得SIP端到端的应用变得非常困难,文章分析了几种SIP穿越NAT方法及其不足,提出了一种基于STUN和TURN方法的穿越方案.其基本思想是根据NAT的不同采用不同的方式实现SIP信令的穿越,而媒体流的穿越则通过对所有可用媒体地址进行连接检查来实现.方案不改动现有NAT,在应用层上实现了对所有NAT的有效穿越,避免单独使用其它方法带来的缺陷.     

Grammar engineering for multiple front-ends for Python

In this paper, we describe our experience in grammar engineering to construct multiple parsers and front ends for the Python language. We present a metrics-based study of the evolution of the Python grammars through the multiple versions of the language in an effort to distinguish and measure grammar evolution and to provide a basis of comparison with related research in grammar engineering. To conduct this research, we have built a toolkit, pygrat , which builds on tools developed in other research. We use pygrat to build a system that automates much of the process needed to translate the Python grammars from EBNF to a formalism acceptable to the bison parser generator. We exploit the suite of Python test cases, used by the Python developers, to validate our parser generation. Finally, we describe our use of the menhir parser generator to facilitate the parser and front-end construction, eliminating some of the transformations and providing practical support for grammar modularisation.     

医院多功能情报监控系统的研究

介绍了基于AT89S52单片机设计的医院多功能情报监控系统,该系统分为监测端和控制端2个部分.监测端位于病房内,和控制端通过CAN总线进行通讯,传递病房内的环境参数以及室内环境调节装置的控制信息.控制端位于控制室内,通过RS232与上位机通信,可以使用计算机上的C语言编译的人机对话界面,对各个病房的环境进行实时监测调节.     

Regional Process Modeling for Design for Environment

This research is an effort towards providing higher level Design for Environment (DFE) tools for a broad industrial region. Issues ranging from the levels immediately above existing design tools, to the envisioned highest level for a broad geographical region are discussed. A tool for the regional planning of the DFE activities is proposed, considering a model construction based on material flows across the industry. The Multi-Lifecycle approach is supported by organizing the input/output flows for industries, potentially utilizing waste material, side products and recycling. Capitalizing on the conceptual integration of the design and process activities, an Abstract Design Environment is used for the design of the basically process oriented material flow tool. Within the context, the relations among design, process and flow-modeling concepts are discussed.     

Louvers design for LED displays for sunny days

The use of louvers attached to variable information display needs to be optimized taking into account different intrinsic and extrinsic parameters. The analysis of the performance of the display–louvers system takes into account the location, orientation, and daily and seasonal variations. The observation of the system is divided depending on the distance of observation. The far distance vision performance use the background luminance. The medium distance performance needs the use of the Contrast Sensitivity Function of the eye.     

Design for All in multimedia guides for museums

The Design for All principles define the characteristics which a device should possess in order for it be utilised by every type of user, independent of his or her sensory disabilities or technological competency. These principles are realised in the current work as an integrative tool with which to facilitate universal access to museums via multimedia and portable guides, making access available to all. Based on these principles, this article describes the main findings of the design and use of the MGA (Multimedia Guides for All) approach proposed in this paper. This approach involves a series of recommendations for the selection, application, preparation of content, and maintenance of this type of computerized device, in order to achieve these principles. Firstly, a comparative analysis of the principal types of electronic guides available in museums which incorporate accessibility criteria is provided. Subsequently, a real case study case is presented which conforms to the MGA approach. The MGA approach can be applied to other domains, which should be explored in further research. The conclusions in this article have been drawn from two R&D projects financed by the Spanish Ministry of Industry, Science and Technology supported by the EC FEDER R&D Program.     

学以致用创新发展

<正>ADI公司2007大学生创新设计竞赛颁奖典礼暨媒体见面会侧记高性能模拟集成电路制造商ADI公司于2007年11月6日在北京工业大学(BJUT)举办"2007年度ADI大学生创新设计人赛"