虚拟样机技术在特种斜盘发动机中的应用研究

利用ADAMS软件中的参数化分析工具,采用设计变量和局部模型重建的方法,实现了特种斜盘发动机斜盘倾角、后球心分布圆半径和导槽形式的参数化,建立了特种斜盘发动机参数化虚拟样机,并进而从设计研究、试验研究和初步优化分析等三个方面,对特种斜盘发动机进行了较为详细和全面的参数化分析.     

架构和模式在水声信息流仿真软件中的应用

水声信息流仿真软件系统涉及多目标、多声纳以及多变的海洋环境.仿真软件的复用性是现代软件工程的重要性能指标.针对系统开放性的特点,在领域分析模型的基础上,采用了面向对象方法设计仿真软件模型.为了满足软件多层次复用的需求,应用软件架构技术和设计模式设计仿真软件.根据水声信息流仿真软件需求,系统划分为四层结构;按功能,层又可分解为包.可复用的设计模式用于设计不同层和包中类之间的关系.提出的仿真软件模型具有良好的可扩充性与可复用性.     

基于虚拟样机的武器装备远程诊断技术研究

针对部队武器系统维护与诊断资源没有很好整合的现状,以网格技术为基础,提出了建设全军层面的武器维护与诊断网格平台的思路,并建立了基于嵌入式智能代理的武器系统诊断网格模型,对模型涉及的关键技术进行了分析;引入虚拟样机仿真技术,结合武器系统设计的发展现状,提出了基于现场监测与虚拟样机仿真的诊断模型,并对实施步骤进行了研究.     

基于蚁群算法的试验流程优化研究

水中兵器的海上试验涉及许多人员、兵力、被试产品、测量设备等,试验周期长、消耗大,因此如何缩短试验周期是亟待研究解决的问题.文中首先将试验流程优化问题转化为车间调度问题,建立了相应的数学模型,再应用蚁群算法转移规则得到中间结果并进行排队以对各种资源约束进行处理.最后将结果利用局部搜索算法优化后作为蚁群算法信息素更新的基础.实例计算结果表明,该方法优化效果良好.     

THE CASE FOR DEFENCE

What is the case for defence and is it a worthwhile investment? This question is addressed for two contrasting nations, namely, the UK and New Zealand. Economists have a set of standard analytical tools for addressing the question but they are difficult to operationalise. This paper provides policy‐relevant answers.     

Democracy and peace: Reply to oneal and russett

The criticism of James, Solberg and Wolfson (JSW) (1999) by Oneal and Russett (OR) is not responsive to the methodologica] issues at stake. JSW argued that war is an endogenous feature of the world political and economic system. If its causes are to be measured, it must be as a structural equation in a simultaneous system. Wedded to the idea that “democracies never fight each other,” OR rely on a single equation to justify their view. JSW claim that such an equation may be an ad hoc reduced form with no causal implications unless the equation is explicitly identified as a structural equation. JSW expand the model to explain democracy and conflict as two endogenous variables. JSW do not claim to have discovered the true relationships between these variables by their minimal expansion of the structural relation. They do show that unless these (and other) variables are treated as part of a system, the results are unstable, contradictory, of minimal size and not a reliable guide to public policy.     

基于PXI总线的虚拟校准设备研究

基于PXI总线技术,对某型导弹内场测试仪的校准设备进行了集成化、小型化研究,依靠计算机强大的计算储存显示等功能,实现了设备操作界面的虚拟化及智能化．最后,对在LabVIEW平台上开发的测量校准软件进行了实验验证,达到了界面友好、操作简单、测量精度高、工作效率高等要求．     

基于面向对象技术的柴油机在线状态监测系统设计

将软件设计中的面向对象思想扩展到系统设计中,针对柴油机实车运行在线监测中的变速变载及空间有限等问题,基于CAN总线的可靠性、信息传输的实时性和多主工作方式,设计分布式智能监测节点和上位机监控中心．分布式监测节点同步采集柴油机运行数据并进行降噪和简单特征提取后,将实时采样数据和在线监测结果上传至基于嵌入式PCI04的上位机监控中心,进行二次特征提取和智能模式识别,从而实现柴油机在线状态监测与故障预警和诊断．     

A case study in bio-inspired engineering design: defense applications of exoskeletal sensors

As part of a bio-inspired design process, the authors examine exoskeletal sensors found in insects and their potential application to armor and hardened buildings. In this way, the outer hardening of a structure or vehicle would not limit the ability of occupants to arrive at an actionable picture of the outer environment. To this end, various sensor modalities employed by insects are compared and contrasted with their current human-engineered equivalents. In several sensing modalities, biosensors perform better, are smaller, and more energy efficient than human-engineered equivalents. They note that biological designs tend to employ non-linear response to signal amplitude and respond with heightened sensitivity over a greater dynamic range of signals than human-engineered sensors. The insect biological sensors have structural and mechanical innovations that preserve the protective capacity of the exoskeleton.     

Dual‐ascent and primal heuristics for production‐assembly‐distribution system design

This article proposes two dual‐ascent algorithms and uses each in combination with a primal drop heuristic embedded within a branch and bound framework to solve the uncapacitated production assembly distribution system (i.e., supply chain) design problem, which is formulated as a mixed integer program. Computational results indicate that one approach, which combines primal drop and dual‐ascent heuristics, can solve instances within reasonable time and prescribes solutions with gaps between the primal and dual solution values that are less than 0.15%, an efficacy suiting it for actual large‐scale applications. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2013