防空导弹引信技术的发展

从新一代防空导弹引信发展需求出发,描述了国外新一代防空导弹引信发展的情况,重点介绍俄罗斯新一代防空导弹包括S-300V,S-300PMU,“道尔”,“通古斯卡”等导弹引信的主要性能,提出了防空引信、引战配合及仿真技术的发展方向和重点研究项目.     

中远程战术导弹预测命中点的计算

探讨了如何根据被动段反战术弹道导弹运动状态来计算其弹道根轨道参数和预测命中点的一般方法。     

自适应滤波在有源消声中的应用

从分析有源消声的难点出发 ,综述了自适应滤波算法在有源消声中的应用 ,给出了相应的实例 .对自适应滤波在有源消声中应用的未来发展趋势作了展望 .     

先验式秘密共享方案及实现

分析了传统的秘密共享算法的不足之处,提出了相应的优化方案,形成了先验式秘密共享方案,包括初始化、份额更新、份额恢复和秘密重构,实现了先验式秘密共享协议的各种算法,充分考虑了秘密分享的各个阶段可能遇到的问题,并分别给出了相应的解决方案.     

Experimental investigation on anti-penetration performance of polyurea-coated ASTM1045 steel plate subjected to projectile impact

In this study, the anti-penetration performance of polyurea/ASTM1405-steel composite plate subjected to high velocity projectile was analyzed. Two kinds of modified polyurea material (AMMT-053 and AMMT-055) were selected and a ballistic impact testing system including speed measuring target system and high-speed camera was designed. This experiment was conducted with a rifle and 5.8 mm projectile to explore the effects by the polyurea coating thickness, the polyurea coating position and the glass-fiber cloth on the anti-penetration performance of polyurea/ASTM1405-steel composite plate. The result showed that the effects of polyurea coating position were different between two types of polyurea, and that the effects of glass-fiber position were disparate between two types of polyurea as well. For AMMT-053 polyurea material, it was better to be on front face than on rear face; whereas for AMMT-055 pol-yurea, it was better to be on rear surface although the difference was very subtle. Additionally, formulas had been given to describe the relationship between the effectiveness of polyurea and the thickness of polyurea coating. In general, AMMT-055 had better anti-penetration performance than AMMT-053. Furthermore, five typical damage modes including self-healing, crack, local bulge, spallation and local fragmentation were defined and the failure mechanism was analyzed with the results of SHPB test. Additionally, the bonding strength played an important role in the anti-penetration performance of polyurea/steel composite plate.     

含缺陷管道评价标准及方法研究

为提高含缺陷管道剩余寿命预测的精确程度,系统阐述了国内外含缺陷管道的评价标准及评价方法,介绍了AGA NG-18标准、ASME B31G标准以及缺陷的具体评价方法,分析了各自的特点,针对评价方法提出了以有限元分析为研究方向的结论。     

分布式虚拟环境中环境信息动态更新研究

环境信息动态更新是分布式虚拟环境的一个主要特点,如何使环境信息更新更活跃、更反应实际情况,一直是分布式虚拟环境研究的重点。在典型的分布式交互环境中,环境信息动态更新是基于协议数据单元(PDU),它不提供数据可靠性传输保证。如何保证分布式环境中各结点环境信息一致性,本文提出了一种信息校验和协议,它通过极少的信息传输就可保证各结点环境信息高度一致。文中定义了保证分布式环境信息动态一致性更新的协议数据单元,并在试验环境中证明了协议的可靠性。     

飞行器动力学环境预示技术应用研究

动力学环境试验技术已被广泛应用 ,但动力学环境预示技术还没有得到很好的重视和发展。讨论了几种动力学环境预示方法的特点 ,着重研究了统计能量分析 ( SEA)方法的原理及其应用 ,并以某型号发动机长尾喷管舱为例 ,具体给出其工程分析估计过程     

Deterrence under nuclear asymmetry: THAAD and the prospects for missile defense on the Korean peninsula

The 2016 decision to deploy Terminal High Altitude Area Defense (THAAD) to South Korea has generated multitude of intensely politicized issues and has proved highly controversial. This has made it challenging to alleviate, let alone clarify, points of analytical and policy tensions. We instead disaggregate and revisit two fundamental questions. One is whether THAAD could really defend South Korea from North Korean missiles. We challenge the conventional “qualified optimism” by giving analytical primacy to three countermeasures available to defeat THAAD–use of decoys, tumbling and spiral motion, and outnumbering. These countermeasures are relatively inexpensive to create but exceedingly difficult to offset. Second, we assess the optimal way to ensure South Korean national security against North Korean missiles. By examining the balance of capability and issues of credibility/commitment, we show that the U.S. extended deterrence by punishment remains plentiful and sufficiently credible even without enhancing the current defense capability.