Irreversible demagnetization mechanism of permanent magnets during electromagnetic buffering

The permanent magnets will be irreversibly demagnetized under high temperature and high velocity during the electromagnetic buffering. In this study, the magnetic field induced by eddy currents and the self-demagnetizing field of permanent magnet are taken into consideration together for demagnetiza-tion analyse. The magnetic Reynolds number is used to express the eddy currents demagnetization. The correction coefficient being expressed as the index of the air-gap width, the inner cylinder thickness, iron pole axial length and the permanent magnet demagnetization coefficient is introduced by magnetic path analysis to represent the self-demagnetization effect and the demagnetization extent. The electromag-netic buffer (EMB) prototype is tested under intensive impact loads of different strengths at room temperature. The accuracy of the nonlinear irreversible demagnetization finite element model is verified by demagnetization on damping force, velocity and displacement. Finally, high-velocity demagnetization and high-temperature demagnetization are analysed in order to obtain the distribution law of irre-versible demagnetization.     

Weapon effectiveness and the shapes of damage functions

This paper provides a review of methods of assessing a fragmentation weapon's effectiveness against a point target or an area target with keeping the focus on the necessity of using the Carleton damage function with the correct shape factor.First,cookie-cutter damage functions are redefined to preserve the shape factor of and to have the same lethal area as the corresponding Carleton damage function.Then,closed-form solutions of the effectiveness methods are obtained by using those cookie-cutter damage functions and the Carleton damage function.Finally,the closed-form solutions are applied to calculate the probability of damaging a point target and the expected fractional damage to an area target for several attack scenarios by using cookie-cutter damage functions and the Carleton damage functions with different shape factors.The comparison of the calculation results shows that using cookie-cutter damage functions or the Carleton damage function with a wrong shape factor results in quite signifi-cant differences from using the original Carleton damage function with a correct shape factor when weapon's delivery error deviations are less than or comparable to the lengths of the lethal area and the aim point is far from a target.The effectiveness methods improved in this paper will be useful for mission planning utilizing the precision-guided munitions in circumstances where the collateral damage should be reduced.     

空军网络化指挥信息系统作战效能评估指标体系构建?

针对目前网络化指挥信息系统作战效能评估指标体系不完善、且缺乏分项指标计算方法模型等问题,从网络化作战对指挥信息系统的作战需求出发,研究构建了空军网络化指挥信息系统的作战效能评估指标体系,并提出了分项指标概念内涵和计算模型与方法,可为指挥信息系统研制提供参考和支撑,为其作战效能的客观评估提供指标体系和模型方法。     

网络中心作战体系效能评估方法初探

网络中心作战体系是信息化战争要求下的一个具体作战体系,其效能评估是网络中心战研究领域的重要问题,是解决网络中心作战体系建设中方案论证、性能效能指标、经济因素等诸多问题的有效方法。首先提出了网络中心作战体系效能评估的基本概念;然后阐述了网络中心作战体系效能评估方法问题,分析介绍了几种较为成熟的评估方法的特点、适用性和不足;最后提出一种基于探索性建模与分析方法的网络中心作战体系效能评估框架,作为研究网络中心作战体系效能评估的参考评估框架。     

潜艇打击水面舰艇的作战方案效能评估ADC法

作战方案评估是指挥决策过程中关键的一步。首先从作战效能的角度建立潜艇打击水面舰艇作战方案效能指标体系,该指标体系充分体现现代作战的动态性和对抗性,并建立影响作战方案效能指标的数学模型,其次运用武器系统评估的ADC法对作战方案效能进行评估,使作战方案的评估更加简便、快捷。最后利用MATLAB编程实现作战方案的评估优选过程。     

一种改进的武器效能评估方法

提出了改进的武器系统效能模糊评估方法,避免了原有方法存在的问题。将武器系统效能评估视为模糊多准则决策问题,通过“目标-准则-系统”层次结构,利用5个模糊比率表示判断矩阵和准则权重向量,将问题转化为模糊数的排序问题,从而选出被评武器系统最优者。与两种武器系统效能评估方法的比较显示新方法是可信有效的。     

手性吸波混凝土电磁屏蔽性能实验研究

综述了手性吸波的研究现状。在实验中进行了手性吸波混凝土的制备,测试了实验样品的电磁屏蔽性能。结果表明,手性吸波模型是混凝土吸波的完整理论,对混凝土的高吸波性能、高屏蔽性能、宽频性能的研究提供了理论基础,为先进吸波混凝土的研制开辟了新途径。     

潜射反舰导弹作战效能的模糊综合评判

潜射反舰导弹是现代潜艇作战的重要武器,对其作战效能的评价长期以来一直采用单一指标,无法全面准确的进行评价.通过对影响潜射反舰导弹作战效能各因素的分析,建立了作战效能综合评价的指标体系.应用模糊综合评判的方法,在借鉴WSEIAC模型的基础上建立了数学模型,并给出算例与仿真.研究结果表明此方法可较好地评估潜射反舰导弹的作战效能,并为其研发及使用提供决策依据.     

纳卡冲突无人机效能分析及启示

大量无人机和巡飞弹的参战成为亚美尼亚与阿塞拜疆在纳卡地区持续四十多天的冲突的焦点,引发世界各国对无人机作战应用的关注。本文回顾了冲突过程,对比了两国战损情况,介绍了主要参战无人机的技术指标与性能优势。无人机在冲突中能够实时获取高清战场图像,发挥情报侦察优势,对重点军事目标进行精准而有效的打击,发挥了较高的作战效能;同时,采取灵活高效的诱饵探测、饱和攻击以及心理威慑等战术,能够进一步提升无人机作战能力。通过分析纳卡冲突中无人机在性能、体系运用方面的不足,本研究提出应根据不同作战需求,在低烈度战争中发挥无人机性价比优势,现代空中作战开展近距支援作战,面向未来战争要在目标识别等方面发展智能信息处理技术,结合无人机不同功能构建新型无人机战术与作战体系,以实现无人机智能化作战。     

电磁屏蔽混凝土性能的数值模拟

从理论上探讨混凝土对电磁波屏蔽效能的潜在规律，旨在为提高我军营房综合防护能力提供参考数据。研究结果显示：复介电常数、复磁导率虚部对混凝土屏蔽效能的改善在高频波段均明显好于实部；与复介电常数相比复磁导率在低频波段的防护效能则更为突出；而单一组分手性物质对混凝土电磁屏蔽效能的提高作用有限。