未来中远距协同空战多目标攻击决策研究

根据先进战斗机的技术特点和未来中远距协同空战发展方向,提出一种基于先敌发现、先敌发射、先敌摧毁能力的空战态势分析模型。同时,采用一种将并行遗传算法与分布估计算法相结合的并行分布遗传算法并将其用于多目标攻击决策。最后利用具体算例进行仿真。结果表明空战态势分析模型能够较为准确地描述未来中远距多机协同空战,采用的算法具有较好的可行性和实时性,为中远距多机协同空战的多目标攻击决策提供了新的思路和方法。     

最大值指标截尾正态分布精度换算方法

提出了面向最大值指标的截尾正态分布精度换算方法,为最大值指标与常用精度指标间的精度换算以及真值测量系统精度指标的确定提供了参考依据。该方法假设系统输出序列中各观测点的合格概率服从对数截尾正态分布;根据给定最大值指标的置信水平及序列样本量,证明并推导了截尾正态分布之截尾上限、截尾下限、均值及标准偏差的计算公式,导出了最大值精度指标与1σ等常用精度指标间的换算关系;结合精密仪器有关理论给出了最大值指标下真值测量系统精度指标的确定方法。实例应用的实验结果表明,该方法是可行的。     

高空风场条件风速概率分布与正态分布差异分析

在飞行器多学科优化设计中,高空风场是有重要影响的不确定性因素,需要准确获取其统计特性。高空风场条件风速的概率分布是特定的,为了便于将高空风场概率模型用于不确定性设计,减少计算量,提出了高空风场条件风速概率分布与正态分布差异的分析方法,给出了将高空风场条件风速概率分布简化为正态分布的适用条件。数值仿真结果表明:在纬度为24.3°N～42.2°N范围内,不同地区高空风场条件风速概率密度与正态分布概率密度的差异在海拔2～30 km范围内呈喇叭形分布,在海拔15 km附近,高空风场条件风速概率密度与正态分布概率密度最接近,高空风场条件风速的概率分布可近似假设为正态分布。综合以上工作,给出了在飞行器不确定性设计中考虑条件风速不确定性时,生成随机样本方法的选择建议。     

On the behavior and shape of mixture failure rates from a family of IFR Weibull distributions

Populations of many types of component are heterogeneous and often consist of a small number of different subpopulations. This is called a mixture and it arises in a number of situations. For example, a majority of products in industrial populations are mixtures of defective items with shorter lifetimes and standard items with longer lifetimes. It is a well‐known result that distributions with decreasing failure rates are closed under mixture. However, mixtures of distributions with increasing failure rates are not easily classifiable. If the subpopulations involved in the mixture have increasing failure rates, there might be some upward movement in the mixture and later a general downward pull towards the strongest component. Little work has been done in describing the shape of mixture failure rates when all subpopulations do not have decreasing failure rate. In this paper, we present general results that describe the shape and behavior of a failure rate of a mixture obtained from two Weibull subpopulations with strictly increasing failure rates. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

载荷分布对六自由度运动平台动力学性能的影响

用Newton-Euler方法,分析了运动平台的力矢和力矩,建立了统一的六自由度运动平台动力学方程。利用该方程研究了不同载荷分布时六自由度运动平台各液压缸的受力情况,并用Matlab进行了计算。结果表明,不同载荷分布时,某些液压缸的驱动力的最大值成倍增加,变化极为复杂,为六自由度运动平台的设计及控制提供了理论指导。     

坦克分队遭遇战斗火力运用研究

根据遭遇战斗的特点,运用随机格斗、微分对策数理战术模型,研究坦克分队遭遇战斗最优火力运用策略问题.研究得出的结论符合坦克分队战术特点,为坦克分队指挥决策提供辅助作用.     

A standardized scan statistic for detecting spatial clusters with estimated parameters

The scan statistic based on likelihood ratios (LRs) have been widely discussed for detecting spatial clusters. When developing the scan statistic, it uses the maximum likelihood estimates of the incidence rates inside and outside candidate clusters to substitute the true values in the LR statistic. However, the parameter estimation has a significant impact on the sensitivity of the scan statistic, which favors the detection of clusters in areas with large population sizes. By presenting the effects of parameter estimation on Kulldorff's scan statistic, we suggest a standardized scan statistic for spatial cluster detection. Compared to the traditional scan statistic, the standardized scan statistic can account for the varying mean and variance of the LR statistic due to inhomogeneous background population sizes. Extensive simulations have been performed to compare the power of the two cluster detection methods with known or/and estimated parameters. The simulation results show that the standardization can help alleviate the effects of parameter estimation and improve the detection of localized clusters. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2012     

常规导弹火力配置算法

基于理论推导提出了一种解决常规导弹火力配置问题的新算法。通过具体分析,建立了常规导弹打击目标火力配置的数学模型,描述了算法的具体原理,给出了算法的全局最优性证明和具体实现流程。     

反舰导弹红外图像生成研究

红外成像仿真的关键环节在于红外图像的生成,反舰导弹的红外图像生成是重要的研究内容,具有重要的军事意义。基于理论分析和计算机技术提出了导弹目标红外图像生成的方法,根据红外物理学、空气动力学以及传热学等基本理论,建立导弹目标的红外理论模型,计算出蒙皮、尾喷管和尾喷焰等重点辐射区域的温度场和辐射场,利用灰度等级描述红外辐射信息,经过建模、视点变换、环境设置等一系列处理并渲染生成红外图像。实验结果证明,红外图像生成方法可行,结果可信。     

编队对地攻击联合火力分配问题的Swt-opt算法

根据未来战争中编队对地攻击的特点,运用一致算法(consensus algorithm)的思想对Swt-opt算法进行改进,解决关于传感器-武器-目标的联合火力分配问题。改进算法继承了Swt-opt算法解决资源分配问题在通信、计算以及对战场态势的容错能力方面的优势,克服了Swt-opt算法受限于网络拓扑结构的缺点。最后,证明了改进算法的可行性,并运用Matlab对改进算法进行了仿真实现。