单脉冲测角在BM突防干扰机上的应用

高分辨雷达(HRR)使用目标HRRP检测目标,由此要求弹道导弹(BM)突防干扰机生成的多假目标信号中包含BM弹头HRRP信息,HRRP长度是HRRP的一个重要特征,需要通过测量雷达观测角计算得到,BM突防干扰机自旋,自身三维姿态难以提取,二维单脉冲测角系统难以应用,一维单脉冲测角系统根据自旋特点,可间断地测得雷达观测角,干扰机和BM弹头运动以及干扰机自旋对测角精度影响较小,间断得到的雷达观测角可以用来计算BM弹头HRRP长度,指出了干扰机章动是影响测角精度的主要因素,最后说明了探讨的方法对目前BM突防干扰机设计具有一定实际工程意义。     

高超声速防空导弹结构防热技术展望

近年来,高超声速防空导弹成为各军事大国研究热门。高超声速防空导弹飞行速度马赫数超过5,因此如何准确确定气动加热环境和进行热防护设计,选择合适的防热结构方案,是研制高超声速防空导弹的重要关键技术。基于未来高超声速防空导弹可能面临的热环境,并结合目前国内外在热防护材料及热结构方面的发展状况,介绍几种适合未来高超声速防空导弹的防热设计方案。     

船用核反应堆提棒外推临界优化研究

因稳定时间受限,传统的倍增公式导出的外推临界公式计算结果大于实测值,偏危险;文中根据新的中子倍增公式导出了外推临界计算的新公式,实例计算表明,该公式比传统的外推临界公式精确且偏安全.     

火炮驻退机故障诊断方法

驻退机是火炮的核心部件之一,其驻退杆活塞套磨损、节制环磨损及驻退机漏液是驻退机常见的故障。结合3种故障的故障机理,在反后坐装置后坐、复进运动方程组基础上,建立了一种新的反后坐装置故障诊断模型。计算机仿真表明,该方法简单、快速、精度高。     

论音乐与社会文化发展的关联性

本文通过对中国当代青年文化的变迁的浅论,简单论述音乐与文化发展的关联性,使我们认识到在当今世界各种文化互动中,我们需要自重,但不封闭,需要学习,但不盲从。     

基于快照日志分析的数据同步方法

在大型信息系统的开发中,分布式数据库和分布式应用系统间的数据同步问题是一个较难解决的问题,现有的各种解决方案存在着难以反映源数据频繁变化、工作效率低以及应用程序间协调困难和部署管理复杂等问题。通过对Oracle数据库的数据复制机制的研究,提出了基于快照日志分析的数据同步方法,介绍了快照日志的数据结构、对数据库操作的记录方式,并阐述了提取快照日志记录的增量变化的日志分析算法,对于实现事务操作频繁的数据表间的数据同步提供了一种新思路。     

Insensitive energetic microspheres DAAF/RDX fabricated by facile molecular self-assembly

Insensitive energetic materials are promising in the defense weapons field. However, energetic materials still suffer from great challenges and the concern about their safety limits their utilization. In this work, insensitive energetic explosive 3,3′-diamino-4,4′-azoxyfurazan/hexahydro-1,3,5-trinitro-1,3,5-triazine (DAAF/RDX) microspheres were fabricated by self-assembly method. Rod-like DAAF/RDX was prepared by mechanical ball milling for comparison. DAAF/RDX composites with different mass ratios (90:10, 80:20, and 70:30) were obtained. The morphologies and structures of as-obtained DAAF/RDX composites were characterized by scanning electron microscopy (SEM), powder x-ray diffraction (PXRD) and fourier transform infrared spectroscopy (FT-IR). The results showed that DAAF/RDX microspheres exhibited regular shaped microspheres with sizes from 0.5 to 1.2 μm. There was no crystal transition during the modification process. The thermal properties of as-obtained materials were then evaluated by differential scanning calorimetry (DSC) and materials studio software. DAAF/RDX microspheres showed an advanced decomposition peak temperature compared with rod-like DAAF/RDX. The binding energy and peak temperature values at zero β_i (T_P0) of DAAF/RDX (90:10) increased by 36.77 kJ/mol, 1.6 °C, and 58.11 kJ/mol, 12.3 °C compared to DAAF/RDX (80:20) and DAAF/RDX (70:30), indicating the better thermal stability of DAAF/RDX (90:10). The characteristic drop height (H₅₀) of DAAF/RDX (higher than 100 cm) composites was higher than that of raw RDX (25 cm), suggesting significant improvements in mechanical safety. The preparation of DAAF/RDX microspheres is promising for the desensitization of RDX and useful for the formation of other materials and future wide applications.     

Preparation and characterization of HMX/EVA/hBNNSs micro-composites with improved thermal stability and reduced sensitivity

Hexagonal boron nitride nanosheets(HBNNSs)have huge potential in the field of coating materials owing to their remarkable chemical stability,mechanical strength and thermal conductivity.Thin-layer hBNNSs were obtained by a liquid-phase exfoliation of h-BN powders and incorporated into EVA coatings for improving the safety performance of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane(HMX).HBNNSs and ethylene-vinyl acetate copolymer(EVA)were introduced to HMX by a solvent-slurry process.For com-parison,the HMX/EVA and HMX/EVA/graphene(HMX/EVA/G)composites were also prepared by a similar process.The morphology,crystal form,surface element distribution,thermal decomposition property and impact sensitivity of HMX/EVA/hBNNSs composites were contrastively investigated.Results showed that as prepared HMX/EVA/hBNNSs composites were well coated with hBNNSs and EVA,and exhibited better thermal stability and lower impact sensitivity than that of HMX/EVA and HMX/EVA/G composites,suggesting superior performance of desensitization of hBNNSs in explosives.     

地面无人装备环境感知能力评价方法研究

地面无人装备已经成为全球重要的发展方向.在无人装备产品快速研发的同时,如何能更好地从实战出发,提出适用于无人装备作战使命和作战任务的装备性能试验测试指标,从而在竞争择优中筛选出真正好用、管用、实用的地面无人装备成为同等重要的研究课题.以地面无人装备最关键的环境感知能力为研究对象,借鉴美国国防部DoDAF多视角研究方案,...     

AGWN信道中相关干扰对JTIDS接收机干扰效果分析

相关干扰是目前研究的对抗联合战术信息分发系统(JTIDS)比较有效的干扰样式,文中主要针对相关干扰对JTIDS接收机的干扰效果问题进行了深入研究。在建立了AGWN信道中相关干扰下JTIDS接收机模型的基础上,推导了接收机输出误比特率公式,并通过仿真和分析,得到了不同信噪比条件下接收机的最佳检测门限值以及误比特率与干信比的关系曲线,最后研究了干扰频偏对干扰效果的影响。研究表明,相关干扰对JTIDS接收机有着良好的干扰效果,并且对干扰频偏敏感。