一种高速实时数据采集处理系统设计

针对目前高速数据采集中的实时性和同步性问题,提出了一种高速实时数据采集处理设计方案。根据上述方案进行了系统的硬件和软件设计,该系统以FPGA器件作为下位机控制核心,设计了时钟同步、数据采集、数据处理、数据缓存、数据通讯等功能模块;整个系统采用ARM微处理器作为上位机控制核心,基于嵌入式Linux 2.6内核进行软件编程,负责向FPGA发送设置参数和控制指令,同时对数据前端采样和处理数据进行存储、显示、统计等。经测试验证,该方案具有高速率、高精度、同步测量、实时处理、体积小、功耗低等优点。     

一类带时滞的非线性兰彻斯特战斗模型的分析

基于非线性兰彻斯特方程的一般形式和现代战争的特点,考虑到时间因素在现代战争中的巨大作用,建立并讨论了一类带时滞的非线性兰彻斯特战斗模型。通过定性分析,得到了模型的平衡点及其稳定性,证明了原模型解的存在唯一性,并给出了解的存在区域。战例分析结果表明该模型能用来描述现代战争。因此,该模型对研究现代战争的战斗进程、武器发展规划、现代军事练兵等都具有一定的参考价值。     

某飞行仿真系统虚拟教员软件研究

针对训练基地飞行模拟改装训练的特点和需求,提出了一种智能评分和虚拟教员实时提示方法。根据训练大纲建立模拟飞行课目专家库,建立分阶段优化评估模型,对不同阶段的关键评价指标进行综合评分,同时依据专家库和模拟飞行参数实时对飞行学员的操作提出虚拟建议,以文字和声音的方式发送给飞行员,最后给出评分结果。虚拟教员能对模拟训练进行实时干预、指导,方便学员进行自主训练,受到训练基地飞行员尤其是新训改装飞行员的广泛欢迎。     

基于正交实验的弹道导弹射程灵敏度参数分析

传统灵敏度分析方法无法得出弹道导弹射程的高敏感影响因素。针对这一问题,提出利用基于正交试验的灵敏度分析方法,对影响弹道导弹战标的主要参数进行分析。选取射程灵敏度问题,设计了实验方案与分析流程,并依托弹道模型进行了仿真。仿真结果验证了方法的有效性。     

链约束下加工时间恶化的Flow Shop排序问题

讨论作业具有线性加工时间,作业间具有链约束的两台处理机流水作业排序问题,目标函数为极小化完工时间。在作业加工时间简单线性恶化下,提出作业的非负开始和停止延迟恶化率,构造了满足约束条件的复合作业。在此基础上,给出作业间具有平行链约束的两台处理机流水作业排序问题的最优多项式算法。     

Preparation of reduced sensitivity co-crystals of cyclic nitramines using spray flash evaporation

The present day weapon technology demands novel energetic materials that exhibit simultaneous high explosive yield and reduced sensitivity. This article demonstrates application of spray evaporation to prepare reduced sensitive co-crystals of high performance nitramine explosives like HMX and CL-20 with a relatively less insensitive explosive 1,1-diamino-2,2-dinitroethylene or FOX-7. Stronger intermolecular hydrogen bonding in FOX-7 is responsible for limited solubility in most of organic solvents. Large solubility differences of FOX-7 with HMX and CL-20 restricts it's co-crystallization through classical methods that yields thermodynamically favorable product. Spray flash evaporation, a kinetic crystallization method, has been therefore adopted and could successfully produce CL-20/FOX-7 (2:1) and HMX/FOX-7 (4:1) co-crystals. The fine powdered materials obtained were characterized by SEM, powder XRD, Raman spectroscopy, DSC-TGA etc. Multipoint Raman spectra showed consistent occurrence of spectral features indicating stoichiometric co-existence of ingredients in the crystal lattices. DSC analysis showed absence of all thermally assisted solid-solid phase transformation in the co-crystals as they were observed in pristine materials. The thermal stability calculated in terms of activation barrier for decomposition, revealed the CL-20/FOX-7 co-crystal to be intermediately stable on comparison to their constituents while, the HMX/FOX-7 co-crystal is more stable. Compared to pure HMX and CL-20, both the co-crystals have shown higher insensitivity to impact force, suggesting them to be suitable for future generation insensitive munitions.     

高铁大风预警模式挖掘

高铁大风预警的传统方法基于风速预测,当瞬时值高于限速阈值时触发报警,存在大量的误报警,不必要的限速控制影响了高铁行车效率。创新地提出了基于序列模式的预警方法,旨在挖掘报警事件前序数据中的频繁模式,找出报警事件的变化规律,通过滤除与非预警序列共有的频繁模式,得到预警序列独有的序列特征,构建了预警模式库。经兰新高铁沿线的监测数据验证,该方法在提高预测准确率的基础上降低了漏报率,同时有效地减少了模式匹配所需的时间,为提前预警预留充分的时间窗口,更加符合实际应用的需求。     

An attacker‐defender model for analyzing the vulnerability of initial attack in wildfire suppression

Wildfire managers use initial attack (IA) to control wildfires before they grow large and become difficult to suppress. Although the majority of wildfire incidents are contained by IA, the small percentage of fires that escape IA causes most of the damage. Therefore, planning a successful IA is very important. In this article, we study the vulnerability of IA in wildfire suppression using an attacker‐defender Stackelberg model. The attacker's objective is to coordinate the simultaneous ignition of fires at various points in a landscape to maximize the number of fires that cannot be contained by IA. The defender's objective is to optimally dispatch suppression resources from multiple fire stations located across the landscape to minimize the number of wildfires not contained by IA. We use a decomposition algorithm to solve the model and apply the model on a test case landscape. We also investigate the impact of delay in the response, the fire growth rate, the amount of suppression resources, and the locations of fire stations on the success of IA.     

Adjacency‐based local top‐down search method for finding maximal efficient faces in multiple objective linear programming

It is well‐known that the efficient set of a multiobjective linear programming (MOLP) problem can be represented as a union of the maximal efficient faces of the feasible region. In this paper, we propose a method for finding all maximal efficient faces for an MOLP. The new method is based on a condition that all efficient vertices (short for the efficient extreme points and rays) for the MOLP have been found and it relies on the adjacency, affine independence and convexity results of efficient sets. The method uses a local top‐down search strategy to determine maximal efficient faces incident to every efficient vertex for finding maximal efficient faces of an MOLP problem. To our knowledge, the proposed method is the first top‐down search method that uses the adjacency property of the efficient set to find all maximal efficient faces. We discuss this and other advantages and disadvantages of the algorithm. We also discuss some computational experience we have had with our computer code for implementing the algorithm. This computational experience involved solving several MOLP problems with the code.     

分布式飞行视景仿真平台的设计与实现

基于多机空战战法训练设备的开发,对视景平台的组成、接口、网络结构、运行机制进行了总体设计,构建了一个具有基本仿真功能,并且相对通用的分布式可视化实时视景仿真平台.重点对飞行动力学仿真系统、视景显示系统和接口网络数据驱动进行了研究与实现.为提高平台的通用性和扩展性,采用了仿真控制主机和目标仿真机运行模式.仿真建模(Simulink)、三维建模(creator)和视景驱动(vega+vc)均采用商业软件,降低了平台的开发难度,缩短了开发周期,并且获得了高质量效果.