飞行器交会对接中基于滤波方法的传感器故障诊断处理

针对两个空间飞行器交会对接过程中追踪飞行器上的各单个测量传感器,探讨了其基于滤波方法的动态过程故障诊断及相应的处理,并特别针对目标相对于传感器的最大机动指数较低的情况,分析了相应的故障诊断及处理方法。     

学术论文摘要与关键词规范化浅析

摘要是从论文中提炼出来的语义完整的概括文章主旨的紧缩性短语的短文;关键词是从报告、论文中选取出来的,用以表示全文主题内容信息的词或词组。摘要、关键词是文献检索的重要标识,具有窥一斑而见全豹的作用。读者只要浏览摘要及关键词,便可了解文章大意,决定是否阅读全文。二者都是为文献检索提供信息或直接为某些文章所转摘。所以,应按照规范要求,把握摘要四要素,认真撰写摘要,准确选取关键词。将文献信息全面、准确、清晰地提供给读者,提高文献转摘率和被引用率。     

舰载无人机光电载荷对海搜索方式与搜索宽度

搜索方式与搜索宽度是舰载无人机对海搜索效率与搜索力配置研究的基础。基于舰载无人机及其光电载荷的性能特点,提出了舰载无人机对海搜索的七种基本搜索方式,并从不同的角度对舰载无人机对海搜索方式进行了分类,给出了搜索方式的选择方法;建立了舰载无人机光电载荷搜索宽度计算模型,为舰载无人机系统采用不同的搜索方式进行搜索时计算其搜索效率和搜索力的配置提供了决策依据。     

潜艇运动对被动声纳浮标搜索的影响

由于被动声纳浮标隐蔽持续探测,潜艇可能由于机动进入浮标探测范围,从而增加了被探测概率。首先,在分析已有模型局限性的基础上,从潜艇运动对浮标搜索影响的原理出发,建立单枚浮标新增搜索区域模型,分析了单枚浮标搜索概率的影响因素,然后建模分析了潜艇运动对浮标拦截线搜索概率的影响因素,得出了影响作用仅对浮标作用距离、间距和航向敏感的结论,并对作战使用方法提出相关建议。     

基于飞蛾信息素寻偶机制的无人机集群协同搜索

为了提高无人机集群协同搜索移动目标的效率,提出一种基于飞蛾信息素寻偶机制的无人机集群协同搜索方法。根据飞蛾基于信息素选择飞行方向的寻偶行为,建立信息素图风向模型和飞蛾信息素寻偶模型。考虑无人机机间避撞约束,提出从飞蛾信息素寻偶机制到无人机集群分布式协同搜索的映射,并给出具体实现流程。仿真实验结果表明了所提方法在解决单个移动目标的协同搜索问题时的有效性和稳定性;外场飞行试验表明了所提方法在实际应用中的可行性。     

空中进攻作战出动计划禁忌搜索优化分析方法

空中进攻作战出动计划涉及多种复杂因素,大规模空中进攻作战出动计划不仅计算量大、出动强度高、架次多,而且当战场形势发生变化时,必须及时对飞机出动计划做出调整,采用手工方式制定和修改作战计划已难以适应未来空中进攻作战的要求。从分析制定空中进攻作战航空兵出动计划所涉及的诸要素出发,提出了一个较为合理的作战出动计划模型,并采用禁忌搜索求解模型的优良解,为实现计算机制定和及时修正空中进攻作战出动计划提出了一种有效的解决方法。     

实时仿真计算机系统的若干问题

本文比较了实时仿真计算机系统中配备A/D、D/A变换器的两种方案。分析了几种检索算法,并且提出了一种新的全并行检索方法——映象检索。文中论述了仿真计算任务的特点及其并行性的开发。本文在分析了AD-10的缺点之后指出,纯异构型仿真专用多处理机的局限性较大,不能充分开发仿真计算任务的并行性。较好的结构形式应是以同构型多处理机为核心。     

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     

On the optimal detection of an underwater intruder in a channel using unmanned underwater vehicles

Given a number of patrollers that are required to detect an intruder in a channel, the channel patrol problem consists of determining the periodic trajectories that the patrollers must trace out so as to maximized the probability of detection of the intruder. We formulate this problem as an optimal control problem. We assume that the patrollers' sensors are imperfect and that their motions are subject to turn‐rate constraints, and that the intruder travels straight down a channel with constant speed. Using discretization of time and space, we approximate the optimal control problem with a large‐scale nonlinear programming problem which we solve to obtain an approximately stationary solution and a corresponding optimized trajectory for each patroller. In numerical tests for one, two, and three underwater patrollers, an underwater intruder, different trajectory constraints, several intruder speeds and other specific parameter choices, we obtain new insight—not easily obtained using simply geometric calculations—into efficient patrol trajectory design under certain conditions for multiple patrollers in a narrow channel where interaction between the patrollers is unavoidable due to their limited turn rate.© 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

决策树知识表示的多故障源搜索算法研究

在深入研究产生式规则知识表示的基础上,运用决策树知识表示方法,完成故障诊断专家系统的知识库设计,对传统的单故障源决策树搜索算法进行了改进,解决了相同故障现象的多故障源连续搜索和定位问题,提高了推理机单次故障诊断的定位率和搜索效率,缩短了故障诊断专家系统的诊断时间。