Combustion of B4C/KNO3 binary pyrotechnic system

Presented herein is an experimental study on the combustion of B4C/KNO3 binary pyrotechnic system.Combustion products were tested using X-ray diffraction(XRD),scanning electron microscopy(SEM),and energy dispersive spectrometer(EDS).According to the results of tests and CEA calculation,the combustion reaction equation was established.The flames and burning rates were recorded by a high speed camera and a spectrophotometer.The effect of B4C particle size on the thermal sensitivity of B4C/KNO3 was investigated by differential scanning calorimetry(DSC)techniques.In addition,a reliable method for calculating the flame temperature was proposed.Based on the results of experiments,the combustion reaction mechanism was briefly analyzed.The burning rate,flame temperature and thermal sensitivity of B4C/KNC3 increase with the decrease of B4C particle size.The mass ratio of B4C/KNO3 has a great effect on combustion properties.Oxidizer-rich compositions have low flame temperatures,low burning rates,and provide green light emission.The combustion reactions of fuel-rich compositions are vigorous,and the B4C/KNO3 with mass ratio of 25:75 has the highest burning rate and the highest flame temperature.     

Pressure relief of underground ammunition storage under missile accidental ignition

Safety of underground ammunition storage is an important issue, especially during the accidental ignition of missiles. This work investigates the pressure and temperature distribution of the multi-layer underground ammunition storage with a pressure relief duct during the accidental ignition process of the missile. A large-scale experiment was carried out using a multi-layered restricted space with a pressure relief duct to simulate the underground ammunition store and a solid rocket motor to simulate the accidental ignition of the missile. The results show that when the motor gas mass flow increased by 5.6 times, the maximum pressure of the ammunition storage increased by 5.87 times. At a certain motor flow rate, when the pressure relief exhaust area at the end of the relief duct was reduced by 1/2, the maximum pressure on the first layer did not change. But the rate of pressure relief was reduced and the time delayed for the pressure of ammunition store to drop to zero. In this experiment, when the motor ignition position was located in to the third layer ammunition chamber, the maximum pressure was reduced by 32.9％ and also reduced the rate of change of pressure. In addition, for the experimental conditions, the theoretical analysis of the pressure relief of the ammunition storage is given by a simplified model. Based on the findings, some suggestions to the safety protection design of ammunition store are proposed.     

地空无人平台协同作战应用研究

战争即将进入智能化时代,无人装备将成为未来战场主角.地空无人平台协同应用是未来战场的必然趋势.基于未来战场复杂作战环境需求,针对地空无人平台协同作战应用进行研究.合理分析协同作战应用的必然性;从协同侦察感知、协同指挥控制、协同支援保障、协同防御警戒4个领域进行作战应用研究,并分析其技术基础及可行性;列出地空协同运用存在的难点并给出合理的意见建议,为陆军作战、编制及装备体系的论证规划提供参考.     

基于有限元法的超声相控全矩阵检测与成像仿真

全矩阵超声相控阵成像技术具有信噪比好、缺陷分辨率高等优点,近年来在无损检测领域获得广泛研究.基于全矩阵数据采集理论和全聚焦成像算法原理,采用有限元法建立超声相控全矩阵检测模型,该模型以钢板中的圆孔缺陷检测为研究对象,提取检测模型中超声纵波幅值信号进行分析.仿真结果显示,采集到的全矩阵A扫描数据具有对称性,且全聚焦算法能有效地实现缺陷的反演成像.成像结果进一步表明,与常规B扫描检测模型相比,该全矩阵模型能准确定位缺陷位置且成像效果较好.而对于某一特定检测介质的全聚焦成像,不同的阵元数成像效果也不同,可以通过数值模拟确定最优的阵元数.     

深刻认识构建社会主义和谐社会的重大意义

构建社会主义和谐社会,是马克思主义中国化的重大理论创新、社会主义建设规律的深刻揭示、我国社会建设体制目标的重大抉择、全面建设小康社会的系统建构、科学发展观的实际体现和中国特色社会主义长治久安的重要保证。     

装备物资混装配载效益化特征聚类分析

提出了通过对物资聚类分组来分步解决混装配载问题的思想,分析了装备物资混装配载中物资分类的办法,讨论了使用聚类分析法研究分类问题的特点,给出了一种基于系统聚类法的物资效益化特征分组方法。     

面向战术通信网络的AODV路由协议的仿真

战术通信网络能实现语音、数据、图像等的传输,是指挥控制、武器系统、侦察、保障装备互连互通的传输平台.路由是网络的基石,研究路由协议是战术通信网络的首要问题.采用AODV路由协议,在网络仿真软件OPNET基础上进行仿真,结果表明满足系统应用需求.     

导弹目标识别的最小贝叶斯风险分类器

在贝叶斯决策理论的基础上,通过划分目标特性空间的方法,推导了目标分类问题的总风险表达式.并根据导弹目标识别的特点,建立了导弹目标识别的最小贝叶斯风险模型,给出了基于风险分析的导弹目标识别的具体实现方法.最后,依据导弹目标的实际情况给出了仿真参数并进行了仿真试验,试验结果证明了本方法的有效性.     

列车用复合材料阻燃性能研究

不同类别的阻燃剂配合使用能产生协效作用,大大提高阻燃效果。在甲基丙烯酸类不饱和聚酯树脂9001基体中,添加微囊化红磷/氢氧化铝/三氧化二锑/甲基膦酸二甲酯(MRP/Al(OH)3/Sb2O3/DMMP)阻燃剂体系,对其树脂体系固化物及玻璃纤维织物复合材料的力学性能和阻燃性能进行了实验研究,提出了一种有望用于列车复合材料大尺寸构件制造的性能优异、价格低廉的新体系。结果表明,当质量添加比例分别为12%MRP、50%Al(OH)3、2%Sb2O3时,树脂体系室温粘度100mPa.s左右,凝胶时间超过80min,适用于RTM和VIMP等大尺寸构件成型工艺;复合材料拉伸强度215.4MPa,弯曲强度177.15MPa,拉伸模量13.85GPa,弯曲模量13.36GPa,氧指数39.7。     

HLA的雷达目标跟踪算法验证系统

构建了一个基于HLA的雷达目标跟踪分布式仿真系统。采用组件设计思想,实现目标跟踪组件和滤波组件,并将这两套组件嵌入到目标跟踪分布式仿真系统中。实践结果表明:基于组件思想构建的目标跟踪和滤波算法能够很好嵌入到分布式雷达目标跟踪系统中,从而为跟踪算法的合理选择、算法参数的优化设计,以及实际系统的研制提供有力支撑。