高寒山地边境反击作战炮兵群火力分配

未来高寒山地边境反击作战,爆发突然,进程极快,必须在被敌发现前高效发挥炮兵群火力,突出作战力量集约,作战体系对抗,实现火力运用最优化、打击效能最大化、弹药消耗和自身损失最小化。把“基于效果”理论运用到指挥决策中,通过研究地理环境、敌情、统计数据分析、优化效能参数,并融入无线传感器网络分簇算法思想,提出一种炮兵群火力运用优化算法,在一定程度上能快速、高效地解决高寒山地边境反击作战炮兵群火力运用的问题,对支持未来作战指挥决策,具有一定的现实意义。     

Effect of metal powders on explosion of fuel-air explosives with delayed secondary igniters

In order to improve the energy level of fuel air explosive(FAE) with delayed secondary igniters, high energetic metal powders were added to liquid fuels mainly composed of ether and isopropyl nitrate. Metal powders' explosive properties and reaction mechanisms in FAE were studied by high-speed video, pressure test system, and infrared thermal imager. The results show that compared with pure liquid fuels, the shock wave overpressure, maximum surface fireball temperature and high temperature duration of the mixture were significantly increased after adding high energetic metal powder. The overpressure values of the liquid-solid mixture at all measuring points were higher than that of the pure liquid fuels. And the maximum temperature of the fireball was up to 1700 ℃, which was higher than that of the pure liquid fuels. After replacing 30％of aluminum powder with boron or magnesium hydride, the shock wave pressure of the mixture was further increased. The high heat of combustion of boron and the hydrogen released by magnesium hydride could effectively increase the blast effect of the mixture. The improvement of the explosion performance of boron was better than magnesium hydride. It shows that adding high energetic metal powder to liquid fuels can effectively improve the explosion performance of FAE.     

A reusable planar triggered spark-gap switch batched-fabricated with PCB technology for medium-and low-voltage pulse power systems

Triggered spark-gap switch is a popular discharge switch for pulse power systems. Previous studies have focused on planarizing this switch using thin film techniques in order to meet the requirements of compact size in the systems. Such switches are one-shot due to electrodes being too thin to sufficiently resist spark-erosion. Additionally, these switches did not employ any structures in securing internal gas composition, resulting in inconsistent performance under harsh atmospheres. In this work, a novel planar triggered spark-gap switch (PTS) with a hermetically sealed cavity was batched-prepared with printed circuit board (PCB) technology, to achieve reusability with low cost. The proposed PTS was inspected by micro-computed tomography to ensure PCB techniques meet the requirements of machining precision. The results from electrical experiments demonstrated that PCB PTS were consistent and reusable with lifespan over 20 times. The calculated switch voltage and circuit current were consistent with those derived from real-world measurements. Finally, PCB PTS was used to introduce hexanitrostilbene (HNS) pellets in a pulse power system to verify its performance.     

身管内弹道性能改变量的静态标定研究

目前国内外静态标定火炮身管内弹道性能改变量的方法,都存在着原理和精度不高的缺陷。采用多特征截面的标定方法可取得满意的精度,本文论述了其理论基础、精度及应用领域。     

Exponential size neighborhoods for makespan minimization scheduling

We investigate the quality of local search heuristics for the scheduling problem of minimizing the makespan on identical parallel machines. We study exponential size neighborhoods (whose size grows exponentially with the input length) that can be searched in polynomial time, and we derive worst‐case approximation guarantees for the local optima of such neighborhoods. The so‐called split neighborhood splits a feasible schedule into two layers, and then recombines the two layers by finding a perfect matching. We show that the makespan of every local optimum for split is at most a factor of 2 away from the globally optimal makespan. We then combine the split neighborhood with two neighborhoods from the literature. The combination of split with the jump neighborhood only marginally improves the approximation guarantee, whereas the combination with the lexicographic‐jump neighborhood decreases the approximation guarantee from 2 to 3/2. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

TBD620柴油机低负荷性能研究

以舰用高速大功率柴油机低负荷问题为研究对象,采用试验和理论分析以及计算相结合的方法,对TBD620柴油机进行缸内示功图实机测试和放热规律计算。结果表明,采用主辅双进气道系统是解决舰用大功率柴油机低负荷性能的一种行之有效的方法。     

一种具有优先级的MAC协议性能分析

在移动通信中,为了满足高动态终端对接入的高要求,设计了一种带有优先级的随机预约/按需分配相结合的MAC协议RRDAMA-P(random reserve/demand assignment multiple access protocol with priority),并利用Opnet软件进行了建模仿真,仿真结果表明,RRDAMA-P协议不仅可以满足终端的优先级要求,而且实现了更好的吞吐量和时延性能。     

基于性能的装备采购合同商选择研究

根据基于性能的装备采购目标,在考虑合同商满足军方提出的性能指标的基础上,从合同商的资质、生产技术能力、装备价格成本、装备保障性能、管理运营情况和双方协商沟通水平等方面建立了合同商选择评价指标体系,并运用层次变权综合决策方法进行综合评判。案例分析表明：该方法能充分反映决策者的意愿,使合同商的选择更好地满足基于性能的装备采购的需要。     

热气溶胶灭火装置安全隐患探讨

针对目前市场上热气溶胶灭火装置＂爆炸＂及存在安全隐患,阐述了其发生原理,并提出了热气溶胶灭火装置应严格控制的一些安全性能指标和结构方式。     

高分辨率相关器多径抑制技术仿真分析

卫星导航系统多径抑制技术种类多,导致工程实践中选取抑制算法困难．针对以上问题,采用蒙特卡洛仿真分析的方法,对比研究了各种抑制技术的优缺点,解决了利用仿真分析、研究相关器多径抑制技术不易实现的难题,验证了高分辨率相关器技术对多径抑制的优越性,为具体使用多径抑制技术提供了参考依据．