常微分方程数值计算导数权重法

提出一个新的单步法 ,它对导数取权重平均值代替算术平均值 .其计算结果与真实值吻合很好 ,计算量小     

警戒雷达被干扰时探测范围的实时计算方法

目前对警戒雷达抗干扰能力的研究大多以效能评估为主,具体探测范围要通过雷达抗干扰实验实际测量获得,不仅成本高、测量数据量大.而且不易实现.针对现代战争中警戒雷达所处的复杂电子干扰环境,给出了机动警戒雷达被多个远距离支援干扰机干扰时探测范围的实时仿真计算方法,对警戒雷达的威力范围或者干扰的压制范围作出定量估算,在这对于研究远距离支援干扰的时机方法和评估雷达的抗干扰性能均具有重要意义.该方法已应用于模拟训练系统中,并获得了令人满意的效果.     

Quality control chart design under Jidoka

We consider design of control charts in the presence of machine stoppages that are exogenously imposed (as under jidoka practices). Each stoppage creates an opportunity for inspection/repair at reduced cost. We first model a single machine facing opportunities arriving according to a Poisson process, develop the expressions for its operating characteristics and construct the optimization problem for economic design of a control chart. We, then, consider the multiple machine setting where individual machine stoppages may create inspection/repair opportunities for other machines. We develop exact expressions for the cases when all machines are either opportunity‐takers or not. On the basis of an approximation for the all‐taker case, we then propose an approximate model for the mixed case. In a numerical study, we examine the opportunity taking behavior of machines in both single and multiple machine settings and the impact of such practices on the design of an X – Q C chart. Our findings indicate that incorporating inspection/repair opportunities into QC chart design may provide considerable cost savings. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009     

燃油喷射汽油机NOx排放的计算研究

根据扩大的Zeldovich理论建立了计算燃油喷射汽油机NOx排放量的双区模型,介绍了NOx排放量的计算方法,分析了点火提前角、过量空气系数、进气压力、进气温度和气缸壁温度等因素对NOx排放量的影响.研究结果表明,双区模型是一种简便而有效的模型.     

基于概率推断网的水雷战专家系统

针对反水雷作战决策的需要,运用贝叶斯推理、模糊逻辑以及可信度不确定推理方法,设计了一个基于概率推断网的水雷战专家系统.利用该系统可得出两种结论:一是利用计算概率的方法得出的结论,二是利用计算可信因子方法得出的结论,两种结论呈现定量和定性的互补关系.可较好地为反水雷作战指挥员提供辅助决策,以减少舰船遭毁伤的概率.     

Statistical Analysis as an Adjunct to Historical Research: Identification of the Likely Manufacturers of British Pattern 1907 Bayonets Supplied by the Birmingham Small Arms Company to the Siamese Government in 1920

In 1920, the Birmingham Small Arms Company supplied 10,000 Pattern 1907 bayonets to the government of Siam to accompany an order for rifles. The original maker of these bayonets was unknown, but historical research indicates that the Wilkinson Sword Co. Ltd. was a primary maker. The weights of some surviving Pattern 1907 bayonets, including twelve bayonets from the 10,000 described above, produced by the six makers in the UK before and during the Great War (1914–1918) period were available. A statistical analysis of the data was performed to compare with the historical research. The results strongly supported that the Wilkinson Sword Co. Ltd. was a primary maker. They were also sufficient to exclude from this batch of twelve bayonets the Royal Small Arms Factory (Enfield) and Vickers Ltd. as manufacturers. The statistical evidence for the presence of bayonets made by J.A. Chapman Ltd., R. Mole & Sons and Sanderson Bros. was weaker than that for the Wilkinson Sword Co. Ltd., but was nevertheless supportive of that hypothesis. Overall, the analysis was consistent with the supply to Siam of commingled bayonets from British government stores. It was noted that the bayonets for the Siam contract fell into a relatively narrow weight range, but the reason for this could not be determined.     

自适应采样数粒子滤波算法

基于统计决策规则提出自适应采样数粒子滤波算法,在定义综合性能风险函数的基础上,推导出粒子数与滤波误差方差之间的关系式,使得在跟踪过程中,可以根据目标的机动情况在线调节粒子数,以使跟踪性能达到最优。在Matlab仿真平台下进行了闪烁噪声下的机动目标跟踪实验,结果表明,自适应采样数粒子滤波算法是一种有效的机动目标跟踪方法,跟踪性能较基本粒子滤波算法提高了3.7倍。     

基于雷达波束篱笆的空间碎片数量的置信区间估计

针对雷达波束篱笆空间碎片探测模式,提出了一种估计碎片数量置信区间的方法.对于给定的轨道高度范围,将轨道倾角和雷达散射截面足够大的碎片是否真正穿越波束篱笆这一事件用(0-1)分布来建模,根据所获取的轨道高度数据,得到该轨道高度范围内碎片穿越波束篱笆的平均概率,进而采用中心极限定理估计出该范围内碎片总数量的置信区间.仿真实验验证了方法的有效性.     

基于统计实验法的单坦克射击效能分析

统计实验法建立的作战模型是一种随机性的仿真模型,特别适合描述作战过程中随机性因素的作用.单坦克射击效能评估是验证射击方式合理性、科学选取射击方式的基本依据.采用概率分析的方法对单坦克在不同射击条件下采用不同射击方式的射击效能进行了分析,并运用统计实验法对单坦克不同射击方式进行模拟,分析坦克性能、射手射击水平、战场环境,目标特征对单坦克射击效能及射击方式选取的影响.     

进化计算在机器人轨迹规划中的应用研究

本文介绍了采用进化计算思想研制的机器人轨迹规划系统ＲＴＰ－１，提出多层次动态结构化编码方案，利用低中高三层进化算法分别优化距离、路径和关节角度偏差，基于多层综合优化策略解决多目标多约束工程优化问题，建立了次序相关问题求解的通用框架。在进化算法中，利用拉马克效应加快轨迹规划速度，在ＲＭ－５０１机械手上实现的任意空间直线和空间曲线轨迹规划具有良好的鲁棒性，规划轨迹的相邻臂构型间具有良好的柔顺性，规划轨迹的臂构型序列具有良好的平滑性。本文所采用的机器人轨迹规划方法具有通用性，可推广应用于各种动力学系统的研制。