基于节点电压增量方程的电路故障子网络诊断

基于节点电压增量方程的电路故障诊断方法通常用来诊断线性电路中的元器件级的故障情况.本文将其推广应用于诊断大规模线性模拟电路中子网络级故障以简化测前仿真,提高诊断效率.     

自动化立体仓库货位优先级生成算法设计

简单描述了自动化立体仓库系统构成,货物存取工作流程;结合堆垛机工作特性及货位综合属性,提出了一种在单作业工作方式下确定货位优先级方法;给出了基于货位优先级的立体仓库出入库算法;货位信息存储采用数据库技术;实验结果表明,系统按优先级实现货位分配与随机分配比较,可以提高系统工作效率。     

ARINC659总线验证平台节点设计与实现

ARINC659背板总线是综合化模块化航空电子系统（IMA）中在线可更换模块（LRM）之间的数字数据传送标准。在所构建的ARINC659总线验证平台中,对ARINC659总线节点的设计和实现进行了深入研究,并给出了测试结果。     

考虑时间约束的无人飞行器航迹规划

在分析时间误差分配的基础上,本文提出了一种考虑时间约束的航迹规划方法.该方法对传统的航迹结构进行了改进,通过速度调整策略和在代价函数中加入时间约束驱使算法找到使到达目标点时间误差尽可能小的航迹.同时,分别研究了起飞时间误差,速度调节能力及飞行速度误差三个因素对到达目标点时间误差的不同影响.     

Strategic flight assignment approach based on multi-objective parallel evolution algorithm with dynamic migration interval

The continuous growth of air traffic has led to acute airspace congestion and severe delays, which threatens operation safety and cause enormous economic loss. Flight assignment is an economical and effective strategic plan to reduce the flight delay and airspace congestion by reasonably regulating the air traffic flow of China. However, it is a large-scale combinatorial optimization problem which is difficult to solve. In order to improve the quality of solutions, an effective multi-objective parallel evolution algorithm(MPEA) framework with dynamic migration interval strategy is presented in this work. Firstly, multiple evolution populations are constructed to solve the problem simultaneously to enhance the optimization capability. Then a new strategy is proposed to dynamically change the migration interval among different evolution populations to improve the efficiency of the cooperation of populations. Finally, the cooperative co-evolution(CC) algorithm combined with non-dominated sorting genetic algorithm II(NSGA-II) is introduced for each population. Empirical studies using the real air traffic data of the Chinese air route network and daily flight plans show that our method outperforms the existing approaches, multiobjective genetic algorithm(MOGA), multi-objective evolutionary algorithm based on decomposition(MOEA/D), CC-based multi-objective algorithm(CCMA) as well as other two MPEAs with different migration interval strategies.     

Two-level optimization approach for Mars orbital long-duration,large non-coplanar rendezvous phasing maneuvers

A relative dynamics equation-set based on orbital element differences with J₂ effects is derived, based on which a two-level approach is proposed to optimize the Mars orbital rendezvous phasing with a large difference in the initial ascending node. The up-level problem uses the revolution deviation between the target spacecraft and the chaser as the design variable, and employs a linear search to find the optimum. The low-level problem uses the maneuver revolutions, locations, and impulses as the design variables, and is solved using a hybrid genetic algorithm combined with sequential quadratic programming. To improve the solution accuracy, an iteration method is developed to satisfy the terminal constraints of the absolute numerical integration trajectory. Test cases involving Mars sample return missions with large initial node differences are presented, which show that the relative dynamics, two-level optimization model, and hybrid optimization algorithm are efficient and robust. Compared with previously published results, the total velocity increment has been further reduced by utilizing this proposed approach. It is found that a five-impulse plan requires the least quantity of propellant, and a propellant-optimal minimum rendezvous duration exists for this long-duration, large non-coplanar rendezvous problem.     

利用升交点经度进行轨道设计的方法

以升交点经度的范围来描述所有能覆盖到目标的轨道。利用球面三角方法详细讨论了在考虑地球形状Ｊ２项的摄动影响时，各种情况下能覆盖目标点的轨道的升交点经度范围，并将其推广到对区域目标的覆盖，给出了完整的解析表达式。结合实例给出了利用该表达式进行有连续覆盖、覆盖次数及过顶时间要求时的轨道设计方法。该方法的优点是无需进行轨道读物计算，仅用解析表达式即可快速地设计出满足覆盖要求的轨道。     

可自启动独热状态编码同步时序电路的设计

介绍了独热 (一对一 )状态编码法在设计同步时序电路中的应用。讨论了具有独热状态编码的同步时序电路的自启动的校正问题。     

防空作战动静态武器目标分配初步研究

防空作战中的武器目标分配是影响系统作战有效性的重要因素之一。动静态结合的武器目标分配,既考虑了武器对不同目标杀伤效果,又考虑了作战这一动态随机过程的特性。讨论了在合理简化条件下的分配过程,先把对目标群的射击效能作为目标函数制定决策,可将目标分配决策化成一个马尔可夫决策过程,通过策略迭代算法得到最优分配策略从而实现系统效益的最大化。最后进行了简化条件下的算例验证,结果表明,该方法能使武器系统获得最大的射击效能,是一种有效的分配方法。     

BTT导弹的抖动抑制多模型切换控制

 基于线性系统特征结构配置和模型跟踪方法,以及优化工具,提出了可以有效抑制抖动的多模型切换控制策略,并用该策略设计了 BTT导弹俯仰 /偏航通道的自动驾驶仪。在导弹的整个飞行轨道上选取了若干点,分别建立起描述 BTT导弹俯仰 /偏航运动的线性时不变数学模型。对各个线性时不变模型,分别用特征结构配置方法设计反馈控制器对系统进行镇定。为了使导弹过载跟踪制导指令,又基于模型跟踪方法设计了前馈控制器。当导弹跨越不同特征点区域时,控制器要进行切换。为了减小切换时的抖动,针对切换后的特征结构配置反馈控制器,利用优化工具合理选取其自由度。仿真结果表明,所提出的方法令导弹的输出过载准确跟踪制导指令,而且切换抖动得到有效抑制。