火箭弹红外成像导引头位标器的机械结构可靠性分析

以一种火箭弹红外成像导引头位标器为研究对象,利用ANSYS建立了位标器的有限元分析模型并分析了位标器机械结构部分的可靠性,首先模拟了导引头位标器在极限温度下-10℃和50℃的热力分析,然后对位标器进行了模态分析并得到了几种固有频率,最后根据位标器的冲击要求进行了冲击响应分析,计算结果表明导引头的机械结构的可靠性满足精度要求。     

基于综合灰关联序模型的残差门控循环神经网络位标器零部件选配

位标器漂移性能是决定精确制导武器跟踪能力与制导精度的关键因素之一,通过位标器零部件选配可改善位标器漂移性能。针对位标器零部件一次选配成功率低的问题,提出综合灰关联序（CGRO）模型并对影响位标器零部件选配的装配参数进行关联分析,得到了影响位标器零部件选配的关键装配参数;建立残差门控循环神经网络（RNGRU）模型,实现了位标器零部件的选配。以影响位标器漂移性能的陀螺转子与调漂螺钉装配为例,应用CGRO模型对陀螺转子的装配参数进行关联分析,得到了影响两者装配的关键装配参数;基于RNGRU模型实现了对调漂螺钉质量的回归预测。实验结果表明,所提方法能够实现位标器零部件的选配,其预测精度优于传统门控循环神经网络。     

基于ZigBee与ARM的远程监控系统设计与实现

针对有线组网方式布线复杂、维护困难的问题,提出了一种基于ZigBee无线组网技术和嵌入式Web服务器,对家庭环境进行远程监控的实现方法。采用温湿度传感器DHT11实现温湿度的采集,烟雾传感器MQ2监测厨房烟雾浓度是否超标,人体红外感应模块实现家庭安防。并且通过红外技术控制空调和加湿器或热水器的打开或关闭．从而实现对温度和湿度的调节,对热水器的远程控制。实验结果表明,该系统体积小、功耗低、运行稳定,具有一定的实际意义。     

Identifying multiple roles of ICT coordinators

This study reports on the development and validation of measurement scales to study the different roles fulfilled by ICT coordinators. Based on a review of the literature, a 24 item questionnaire was constructed and administered to a sample of 177 Flemish ICT coordinators working in primary education. Exploratory factor analysis revealed a four-factor solution: the ICT coordinator as a planner, a budgeter, a technician, and an educationalist. Qualitative data corroborated these roles. This study provides a quantitative measure of the different roles assumed by ICT coordinators in practice. The implications of our findings for schools, researchers and policy makers are discussed.     

协调器小平衡机失稳校核及设计

为进一步研究协调器小平衡机机械特性,分析小平衡机活塞杆的稳定性及其设计位置对整机性能的影响。以多体动力学及虚拟样机技术为基础,在ADAMS环境里建立小平衡机的虚拟样机模型。利用该模型对小平衡机活塞杆进行受力分析和压杆稳定校核,并分析了小平衡机的位置改变对协调器驱动力矩的影响。仿真结果证明:该方法能确定位置变化量与最大力矩之间的关系,为小平衡机的压杆稳定研究提供数据依据。     

基于故障树的火炮协调器机电液系统故障分析

为分析某型火炮协调器在控制程序无误的情况下仍出现控制未到位的问题,以协调器的机电液系统为分析对象,提出一种基于故障树分析(fault tree analysis,FTA)系统故障点的方法.以协调器控制未到位为顶事件进行系统故障分析并建立故障树;对协调器故障树进行定性分析,找出其最小割集;定量分析故障树顶事件发生概率和底事件故障概率以及重要度,结合底事件分析中间事件发生概率;并对协调器部件故障发生概率进行排序和分析.结果表明:该方法能避免盲目操作,提高维修效率.     

Handover approaches for seamless mobility management in next generation wireless networks

Next generation wireless networks (NGWN) will be an integration of heterogeneous wireless access networks that will interwork over an IP‐based infrastructure. This all‐IP vision has led to the development of handover mechanisms to support seamless mobility for active network services among the different interworking wireless networks in order to ensure network access ubiquity in NGWN. These handover mechanisms need to ensure that mobile devices continue to receive ongoing communication without any noticeable disruption during handover events among the heterogeneous networks. This paper gives a qualitative and quantitative review of current handover approaches of IP mobility management protocols for NGWN with an objective to introduce a new way of further optimizing the handover performance. In particular, the paper focuses on handover approaches of mobile IPv6 (MIPv6) based mobility management protocols. Thus, the need, benefits, and limitations of these handover approaches are explored. Thereafter, dynamic handover coordination is introduced as a new viable solution that exploits the benefits and mitigates the limitations of these handover approaches hence improving handover performance in terms of handover delay, packet loss, and signaling overhead. Copyright © 2011 John Wiley & Sons, Ltd.     

Herding Cats: Lessons Learned From Managing and Coordinating Organization Development Consultants.

Organizations need to prevent or ameliorate the unanticipated counterproductive consequences of recruiting, selecting, contracting with, deploying, and holding their consultants accountable. This article documents the creation of what was, in 1991-1992, a new organizational role: A designated "coordinator of consultants" for the client system. Also documented are a number of lessons learned during the first 14 months of experience with this new role. These observations, or "Lessons Learned," also seem to be pertinent to the emerging and increasingly recognized field of consulting psychology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于Labview的位标器陀螺转子动平衡测量

对导引头位标器陀螺转子的不平衡量进行了研究,为了在检测其振动的同时能够测量位标器的绕动,以便在安装过程中能够对其作较好的调整,介绍了一种采用两步法进行位标器陀螺转子动平衡测量的方法;首先是调用Labview中的功率谱子VI用能量矩平衡法进行频率的测量,然后采用线性最小二乘法来求出振动的幅值和相位差大小;两步的算法均为线性算法,具有收敛速度快,计算准确度高的特点;最后,进行了大量的计算机仿真计算和实际试验,证明了该方法的有效性.     

航空备件供应仿真的仿真协调器构造

建立仿真模型是航空备件供应系统分析的新方法，仿真协调器是其中的核心部件之一。分析了仿真协调器对于生成离散事件系统耦合模型抽象仿真器的必要性；研究了仿真协调器在建模实现过程中所担负的功能，即时间推进、协调并发系统以及协调系统时间；研究了仿真协调器的构造和算法。研究的仿真协调器是运用面向对象分析技术构造和实现备件供应面向对象仿真模型的重要基础。最后，通过实例分析了协调器的描述能力，表明能很好地满足其职能。