天地测控资源调度的两阶段递进遗传算法

为对天地测控资源调度进行高效求解,设计了两阶段递进遗传算法对其进行优化调度。鉴于问题的目标具有一定的可分性,以时间为依据将被调度弧段划分成两个部分,在对第一部分形成种群并作进化求解的基础上,将其最优解与第二部分弧段组合,并作进一步的进化求解。为了缓解两阶段优化的局部搜索特性,在第一阶段个体适应度计算中,以一定概率设定虚拟弧段,保留具有潜在全局优势的个体。仿真表明该方法能在确保求解质量的前提下明显减少运算时间。     

装备维修资源优化中的模拟退火遗传算法

在对模拟退火遗传算法改进的基础上,结合建立的通信装备维修资源分配模型,给出了该算法的实现过程,并利用此算法对模型进行了最优化求解。实例的计算结果表明该算法对于模型的求解具有较好的收敛性。     

装甲装备使用可用度与维修保障费用的优化模型

维修保障费用是影响装甲装备使用可用度的重要因素之一。要在有限的保障经费下实现高可用度要求,就必须建立装甲装备的使用可用度与维修保障费用的优化模型。根据装甲装备实际维修特点,在分析装甲装备预防性维修过程中故障类型多样的基础上,构建了装甲装备在给定维修周期内的使用可用度模型和维修保障费用模型,进而建立了使用可用度与维修保障费用的优化模型,提出了模型的解法和模型的改进建议。     

A model to design recreational boat mooring fields

This article develops a mathematical model and heuristic algorithm to design recreational boating mooring fields. The boating industry is important to the Florida economy, and boat storage is becoming a concern among those in the industry. The mooring field design problem is formulated to maximize the total number of boat feet moored in the mooring field. In the model, we allow two adjacent moorings to overlap, which introduces a risk that under certain conditions the boats on these moorings could contact each other. We identify the conditions when contact is possible and quantify the probability of contact. The mooring field design problem is formulated as a nonlinear mixed‐integer programming problem. To solve the problem, we decompose it into two separate models, a mooring radii assignment model and a mooring layout model, which are solved sequentially. The first is solved via exhaustive enumeration and the second via a depth‐first search algorithm. Two actual mooring fields are evaluated, and in both cases our model leads to better layouts than ones experts developed manually. The mooring field design model rationalizes the mooring field design and shows that in one case by increasing the risk from 0 to 1%, the mooring efficiency increases from 74.8% to 96.2%. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

Consecutive k‐within‐m‐out‐of‐n:F system with exchangeable components

As a generalization of k‐out‐of‐n:F and consecutive k‐out‐of‐n:F systems, the consecutive k‐within‐m‐out‐of‐n:F system consists of n linearly ordered components such that the system fails iff there are m consecutive components which include among them at least k failed components. In this article, the reliability properties of consecutive k‐within‐m‐out‐of‐n:F systems with exchangeable components are studied. The bounds and approximations for the survival function are provided. A Monte Carlo estimator of system signature is obtained and used to approximate survival function. The results are illustrated and numerics are provided for an exchangeable multivariate Pareto distribution. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009     

串联系统预防维修周期优化策略研究(英文)

针对串联系统建立了基于可靠性约束的预防性维修优化模型,该模型充分考虑到预防维修可以提高系统可靠性的同时,其故障率会随着维修次数的增加而上升,引入役龄回退因子对预防维修活动前后系统性能的动态变化进行了描述.通过实例验证了该优化模型的正确性与可用性,对模型作进一步的扩展,还可用于更一般复杂的串并联系统.     

均匀分布集群目标射击火力分配优化数值仿真方法

基于所提出的火力分配方案,使用数值积分方法将对均匀分布集群目标射击的火力分配优化问题转化为由多变量初等函数表示的积分和函数在单位多面正方体内的最小值求解问题,火力分配优化的瞄准点坐标可以尝试利用成熟的Matlab优化计算软件来直接求解,算例说明所给出方法对于火力分配优化问题的深入研究是有裨益的.     

炮兵作战决策方案优选的方法

炮兵作战方案的选择,是炮兵作战指挥决策的关键环节,其合理与否,直接关系到炮兵作战效能的发挥和作战的成败.根据炮兵作战的实际,阐述了炮兵作战方案优选的依据,给出了运用层次分析法确定影响作战方案选择的各因素权重的方法步骤,在对优选依据的建模要素进行分析的基础上,构建了每个要素的效用函数计算模型,并给出了评估方案的计算方法,提供了模型应用的一般步骤.     

滑翔增程弹滑翔弹道优化设计分析

针对鸭式布局的滑翔增程弹,建立了滑翔增程弹滑翔弹道的模型,采用使滑翔弹道上每一点的升阻比最大的设计思想进行弹道优化设计,导出了俯仰舵偏角与平衡攻角的表达式,并对滑翔飞行弹道特性进行了仿真计算分析.仿真计算表明,滑翔弹道与常规弹道降弧段相比下降趋缓,增程效果显著.     

基于遗传算法的多目标虚拟装配路径规划

针对以往求解路径规划问题中以路径最短为目标的局限性以及随机选取初始路径的缺陷,引入合适的目标函数和遗传算子,提出了一种基于遗传算法的多目标虚拟装配路径规划方法,利用大范围初始化的方式产生具有代表性的初始群体,设计了具有启发作用、适合路径规划的遗传算子,能够同时得到不同特点的多条路径,优化了装配路径.