Effects of total pressures and equivalence ratios on kerosene/air rotating detonation engines using a paralleling CE/SE method

In this paper, the kerosene/air rotating detonation engines(RDE) are numerically investigated, and the emphasis is laid on the effects of total pressures and equivalence ratios on the operation characteristics of RDE including the initiation, instabilities, and propulsive performance. A hybrid MPI + OpenMP parallel computing model is applied and it is proved to be able to obtain a more effective parallel performance on high performance computing(HPC) systems. A series of cases with the total pressure of 1 MPa, 1.5 MPa, 2 MPa, and the equivalence ratio of 0.9, 1, 1.4 are simulated. On one hand, the total pressure shows a significant impact on the instabilities of rotating detonation waves. The instability phenomenon is observed in cases with low total pressure (1 MPa) and weakened with the increase of the total pressure. The total pressure has a small impact on the detonation wave velocity and the specific impulse. On the other hand, the equivalence ratio shows a negligible influence on the instabilities, while it affects the ignition process and accounts for the detonation velocity deficit. It is more difficult to initiate rotating detonation waves directly in the lean fuel operation condition. Little difference was observed in the thrust with different equivalence ratios of 0.9, 1, and 1.4. The highest specific impulse was obtained in the lean fuel cases, which is around 2700 s. The findings could provide insights into the understanding of the operation characteristics of kerosene/air RDE.     

A method to determine the shell layout scheme for equipment battlefield damage tests under artillery fire

In this paper,a new method for determining the shell layout scheme is proposed,which can make the equipment damage data by the battlefield damage test resemble as close as possible the actual combat data.This method is based on the analysis of the impact point distribution and effective damage area of equipment.In order to obtain the position of the impact points,an impact point distribution model under artillery fire was established.Similarly,in order to obtain the effective damage area of equipment,the concepts of generalized damage area and task-based equipment functional damage probability were demonstrated,and the corresponding calculation model was established.Through case analysis,the shell layout scheme was effectively obtained,verifying the correctness of the proposed method.     

两栖装备乘员可靠性影响因素分析

人的可靠性指的是人在规定的时间内、规定的条件下、完成规定任务的能力,它是整个系统可靠性一个重要的组成部分,作为装甲装备而言,乘员可靠性的高低直接影响到整个装备作战系统可靠性.针对两栖装备的使用环境和使用特点,对影响乘员可靠性的因素进行了分析,得出了结论,对于如何提高两栖装备乘员可靠性有一定的指导意义.     

防空多传感器网络的拓扑优化模型

防空多传感器网络是防空网络化作战体系结构的重要组成部分。针对防空多传感器网络的网络结构模型,研究了已知网络中单元节点的位置和数量,如何最优确定网络中继器的位置、数量及其与单元节点的连接关系,即网络拓扑优化设计问题。最后给出了防空多传感器网络拓扑优化设计的数学模型及其求解方法。     

基于机动动作库的航路飞行仿真方法

提出将航路飞行航迹分段为直线机动段和空间任意平面内的圆弧机动段,再将各段进行切线连接,形成光滑的航迹.这种采用多段组合航迹的生成方法,获得空中的航路点信息后,计算飞行时的空中姿态.仿真结果表明,本方法可以根据输入的航路点数据,有效获得准确的空中航迹.     

无攻角弹体斜侵彻多层间隔混凝土靶板特性

为了能清楚地了解无攻角弹体斜侵彻多层间隔混凝土靶板的特性,采用LS-DYNA3D动力有限元软件对弹-靶作用过程进行了一系列数值模拟研究,描述了斜侵彻过程中的基本现象,分析了弹体X、Y两个方向的加速度变化规律,揭示了靶板间距、层数对抗弹性能的影响。研究表明,在总厚度一定的情况下,靶板间距的减小或者层数的增加均会降低靶板的抗弹性能,但当靶板层数较多时,抗弹性能随靶板层数的增加变化不大。所得结论对防御工事、地下掩体的构建具有参考价值。     

一种基于加权DSmT的序列图像目标识别方法

通过对自动目标识别系统研究与分析,将DSmT引入到飞机序列图像识别中,构建基本置信指派及分类规则,提出了一种基于加权DSmT的序列图像目标识别方法,在分析权值选择特点的基础上,根据特征信息的置信指派组合有效权值,并且给出了基于加权DSmT融合规则的序列图像目标识别的流程,仿真结果表明,该方法提高了序列图像目标识别的准确性.     

高速数字电路信号完整性设计

随着电子产品日愈复杂,电路板工作频率不断提升,从而导致信号完整性问题。从工程应用角度阐述了高速电路的概念,列举了典型的信号完整性问题,如反射、串扰、电源和地噪声、定时等,提出信号完整性设计中所应遵循的设计方法,如控制走线长度、特征阻抗控制与计算,仿真技术等,并讲解了真实的设计案例,具有工程应用实际参考价值。     

Shor-Preskill方法不能直接证明B92量子密钥分配协议

密钥分配协议安全性的证明是确保密钥分配绝对安全的要求 ,经典密码方案的安全性大多难以证明 ,而利用量子力学的基本原理 ,可以证明量子密码方案是无条件安全的。介绍了Shor Preskill对BB84量子密钥分配协议无条件安全性的证明方法 ,归纳了其技巧和特点 ,揭示了对称化方法和量子纠缠提纯技术在该方法中的作用。证明了Shor Preskill方法不能直接用来证明B92协议的无条件安全性。提出了利用Shor Preskill方法间接证明B92的可能途径。     

战场环境下C3I系统效能研究

:C3I系统已成为现代化战争必不可少的重要组成部分 ,其效能分析也越来越受到人们的重视。首先对 C3I系统效能的含义做了分析 ,并在一般效能模型的基础上深入讨论了 C3I系统的作战效能 ,对 C3I系统作战效能的含义和计算进行了研究 ,给出了一种新的评价 C3I系统的方法