武器装备体系需求获取和管理方法研究

为解决武器装备体系需求工程中需求获取方式不统一,需求管理难的问题,论文在分析了基于能力的需求分析方法的思想的基础上对装备需求工程的两个基本环节:需求获取和需求管理进行了研究。提出了基于体系结构设计的装备体系需求获取方法,并对其关键要素:作战使命任务层次、节点信息关系、使命-能力映射进行了分析;然后以反导作战信息支援装备体系能力需求为实例,说明采用DOORS(Dynamic Object Oriented Requirements System)工具对体系能力需求的管理方法,表明本文所研究的方法对体系需求分析的研究是有效的,具有一定的借鉴意义。     

远海作战装备供应链体系架构

信息化使战争的节奏加快,如何满足快节奏战争对装备的需求,无疑是军事保障领域值得研究的一个问题.供应链思想被引入军事物资保障系统后,已在多个领域发挥了显著的效用.建立装备供应链网络对提升远海作战装备供应能力既有现实意义又是可行的,这是因为：一方面信息化条件下远海作战需要更有效率的装备供应体系,另一方面企业供应链为装备供应链提供了可以借鉴的模式.本文通过对远海作战装备供应链目标和特征的分析,参照企业供应链和美军海上供应链建设的情况,建立了远海作战装备供应链网络,并对供应链流程进行了说明.     

基于HLA的C^4ISRK作战运用仿真系统探讨

C4ISRK是实现未来信息化战场"网络中心战"概念的一组必要的装备系统.着眼于为C4ISRK系统作战运用项目先期概念技术演示提供仿真平台,提出了C4ISRK系统的概念模型,在此基础上重点研究了基于HLA的C4ISRK作战运用仿真系统的总体框架及其设计,为该仿真系统的建立和仿真实施提供了技术支持.     

低信噪比抖动红外点目标的检测

本文为解决低信噪比条件下抖动红外点目标的检测问题，提出了一种基于膨胀累加、检测前跟踪的检测算法。该算法运用膨胀累加方法能够消除抖动对多帧累加算法的不利影响，使目标能量仍然能够实现有效的积累，从而达到目标增强的目的。本文还采用了小波变换预处理方法，对图象中相关的１／ｆ噪声进行白化。模拟实验结果表明，该算法能够快速检测出信噪比为２抖动点目标。     

面向多点交互的多模态振动反馈触觉再现系统

近年来,多点交互和多模态融合的力触觉再现系统由于能够进一步提高人机交互的真实感,已经成为该领域的研究热点。基于Leap Motion的多手指位置检测模块、振动触觉再现模块、NRF51822蓝牙通信模块、视觉再现模块和CHAI3D构建的虚拟环境等,设计实现了多点自然交互的、触觉和视觉相融合多模态触觉再现系统。为了验证系统的可行性和有效性,开展了虚拟物体轮廓感知实验和立方体放置任务实验。实验结果表明:虚拟物体轮廓感知实验平均识别率为87.9%;相比单一视觉再现模式,视觉和触觉再现融合模式完成相同任务的时间能节省47.7%。所设计的多点交互触觉再现系统,具有成本低、体积小和控制方法简单等优点,为促进多模态人机交互技术的发展和广泛应用奠定了重要基础。     

Research on the influences of confining pressure and strain rate on NEPE propellant: Experimental assessment and constitutive model

In order to study the influences of confining pressure and strain rate on the mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant, uniaxial tensile tests were conducted using the self-made confining pressure system and material testing machine. The stress-strain responses of the NEPE propellant under different confining pressure conditions and strain rates were obtained and analyzed. The results show that confining pressure and strain rate have a remarkably influence on the mechanical responses of the NEPE propellant. As confining pressure increases (from 0 to 5.4 MPa), the maximum tensile stress and ultimate strain increase gradually. With the coupled effects of confining pressure and strain rate, the value of the maximum tensile stress and ultimate strain at 5.4 MPa and 0.0667 s⁻¹ is 2.03 times and 2.19 times of their values under 0 MPa and 0.00333 s⁻¹, respectively. Afterwards, the influence mechanism of confining pressure on the NEPE propellant was analyzed. Finally, based on the viscoelastic theory and continuous damage theory, a nonlinear constitutive model considering confining pressure and strain rate was developed. The damage was considered to be rate-dependent and pressure-dependent. The constitutive model was validated by comparing experimental data with predictions of the constitutive model. The whole maximum stress errors of the model predictions are lower than 4% and the corresponding strain errors are lower than 7%. The results show that confining pressure can suppress the damage initiation and evolution of the NEPE propellant and the nonlinear constitutive model can describe the mechanical responses of the NEPE propellant under various confining pressure conditions and strain rates. This research can lay a theoretical foundation for analyzing the structural integrity of propellant grain accurately under working pressure loading.     

Investigation on the process parameters of TIG-welded aluminum alloy through mechanical and microstructural characterization

Multi-pass TIG welding was conducted on plates (15×300×180 mm3) of aluminum alloy Al-5083 that usually serves as the component material in structural applications such as cryogenics and chemical processing industries. Porosity formation and solidification cracking are the most common defects when TIG welding Al-5083 alloy, which is sensitive to the welding heat input. In the experiment, the heat input was varied from 0.89 kJ/mm to 5 kJ/mm designed by the combination of welding torch travel speed and welding current. Tensile, micro-Vicker hardness and Charpy impact tests were executed to witness the impetus response of heat input on the mechanical properties of the joints. Radiographic inspection was performed to assess the joint's quality and welding defects. The results show that all the specimens displayed inferior mechanical properties as compared to the base alloy. It was established that porosity was progressively abridged by the increase of heat input. The results also clinched that the use of me-dium heat input (1-2 kJ/mm) offered the best mechanical properties by eradicating welding defects, in which only about 18.26% of strength was lost. The yield strength of all the welded specimens remained unaffected indicated no influence of heat input. Partially melted zone (PMZ) width also affected by heat input, which became widened with the increase of heat input. The grain size of PMZ was found to be coarser than the respective grain size in the fusion zone. Charpy impact testing revealed that the absorbed energy by low heat input specimen (welded at high speed) was greater than that of high heat input (welded at low speed) because of low porosity and the formation of equiaxed grains which induce better impact toughness. Cryogenic (-196 C) impact testing was also performed and the results corroborate that impact properties under the cryogenic environment revealed no appreciable change after welding at designated heat input. Finally, Macro and micro fractured surfaces of tensile and impact specimens were analyzed using Stereo and Scanning Electron Microscopy (SEM), which have supported the experimental findings.     

MIMD上三层格式的窗口并行迭代方法

本文对一般的三层格式给出了在MIMD 机上实现的窗口并行迭代方法,给出了WBJ 格式,分析了三层格式的收敛性。文章的结论表明窗口并行迭代法的收敛性与窗口大小无关,窗口大小影响每台处理机的使用效率。     

一部特开生面的历史作品——《曾国藩与湘军》评介

乔良在《超限战》中曾提出过“科学时代”与“技术时代”的划分： 在功利主义的熏风吹拂下，技术比科学更受人们青睐是不足为奇的。科学大发现的时代，已经留在了爱因斯坦以前的岁月。现代人则越来越倾向于：在我活着的时候，就看到一切梦想实现。这使他们在为自己的明天下注时，大都透过上千度的近视镜片去乞灵膜拜于技术。如是，在不太长的时间里技术得到了令人瞠目的爆炸性发展，给急功近利的人类带来了数不胜数的好处，而我们自豪地把它称之为技术进步，却不知此时自己正置身于一个迷失了心性的技术蒙昧期。     

潜艇目标态势对航空磁探测的影响分析

航空磁探潜是通过磁探仪探测磁异信号,进行航空反潜的重要手段。通过仿真各种情况的磁异常信号,能够得到各种态势下的潜艇磁场分布,为后续磁检测提供数据支撑。提出将潜艇速度,地磁场环境纳入潜艇磁异信号模型中,并定量分析了其对磁异信号的影响模式。