Ka波段过模慢波结构色散曲线的数值求解

运用场匹配法,结合Ka波段过模慢波结构的实际情况,进行轴对称周期慢波结构色散关系的理论推导,得到了一种快速、准确计算适应Ka波段过模慢波结构的色散特性计算方法。根据推导结果,采用MATLAB程序编程计算了Ka波段过模盘荷波导的色散曲线。将计算得到的色散曲线与成熟的商业软件计算得到的结果进行了对比,两者误差在2%以内,验证了数值算法的可靠性。计算得到的色散曲线可以辅助选取Ka波段微波源的结构参数,对器件设计有一定参考价值。     

作战信息需求模型

研究了作战信息需求的概念、需求分析流程及描述方法,提出了作战信息需求的概念模型、逻辑模型和过程模型。概念模型界定了作战信息需求的相关概念及层次关系;逻辑模型描述了作战信息需求的内容;过程模型分析了作战信息需求的演化过程。     

检测探头提离效应对管道漏磁检测影响分析

在管道漏磁检测中,检测探头的提离效应对管道缺陷漏磁检测性能影响较大.在对漏磁检测探头提离效应影响因素分析的基础上,分析了管道漏磁检测探头提离效应影响特性;通过建立的模拟漏磁检测探头提离效应影响分析的实验装置系统,提取了传感器、磁化器在不同提离情况下的检测信号.根据实测数据,研究了漏磁检测过程中提离值对漏磁信号的影响趋势...     

对现有跑道失效率模拟模型的改进

通过常规导弹打击跑道毁伤效应分析,重点考虑子弹毁伤半径对跑道能造成毁伤的子弹个数,升降窗口移动时左右边界位置和判断升降窗口区域是否失效的影响,并结合现有跑道失效率模拟模型,提出现有跑道失效率模型存在的缺陷和相应的改进方法,最后通过实例分析模型改进后的合理性和科学性。     

Schedule design for liner services under vessel speed reduction incentive programs

Gas and particulate emissions from ship transportation have been increasing in recent years. In order to mitigate ship emissions near coastal areas, voluntary vessel speed reduction incentive programs (VSRIPs) were put in place by a number of ports. This paper studies a schedule design problem faced by liner shipping companies under VSRIPs. It proposes a mixed-integer nonlinear mathematical model for the minimization of the total cost, consisting of fuel cost, as well as operating cost, minus dockage refunds. The model balances three determinants, that is, the compliance of VSRIPs, the speed limit (the maximum physical speed of ships and the upper speed limit imposed by VSRIPs), and the limited number of ships. An enumerative algorithm and a piecewise-linear approximation algorithm are developed, based on some properties of the nonlinear model. The efficiency of the proposed algorithms is validated through extensive computational experiments.     

PXI总线的模拟用户V口通信模块设计

针对目前自动测试系统中要求测试信号传输距离远、传输速度快、传输信号种类多、系统工作环境恶劣等问题,设计并实现了基于PXI总线的模拟用户V口通信模块。利用专用接口芯片PCI9656设计了PXI总线接口模块,利用FPGA实现了对来自电话接口(V口)典型的双音多频拨号信息的判读和控制。本设计具有传输速度快、灵活高效的特点,增强了系统的集成度、稳定性和可靠性。     

基于虚拟样机技术的履带式装甲车辆行驶路面测量方法研究

在对车辆简化模型进行动力学分析的基础上，提出了一种新的履带式装甲车辆行驶路面测量方法，并采用虚拟样机辅助的方式，从原理上证明了这种方法是可行的。     

大斜视角下空时编码成像算法

空时编码可以有效地消除多发多收雷达的自相关干扰,但是传统的空时编码合成孔径成像算法无法精确校正其距离方位耦合,因此限制了其在大斜视角情况下的数据处理能力。为避免以上缺陷,将空时编码方案与ωK算法相结合,在空时解码处理中引入新的解码矩阵来完成一致聚焦,利用Stolt映射完成补余聚焦,对距离方位耦合进行精确地校正。理论分析和仿真结果表明:该方法能够在大斜视角情况下实现目标的高质量成像,并有效地消除了互相关干扰。     

工程兵反机动保障能力仿真分析

反机动能力影响信息化条件下各参战部队作战能力的发挥,提高战场反机动能力是工程兵部队工程保障的重要内容.对反机动保障能力的研究,传统的方法侧重于静态分析,无法确定反机动保障系统内部的复杂关系.利用系统动力学方法建立工程兵反机动保障系统动力学仿真模型,借助Vensim PLE运行模型,据此,对工程兵反机动保障能力进行分析,为指挥人员提供决策依据.     

Terminal allocation problem in a transshipment hub considering bunker consumption

This article investigates the method of allocating arriving vessels to the terminals in transshipment hubs. The terminal allocation decision faced by a shipping alliance has the influence on the scheduled arrival time of vessels and further affects the bunker consumption cost for the vessels. A model is formulated to minimize the bunker consumption cost as well as the transportation cost of inter‐terminal transshipment flows/movements. The capacity limitation of the port resources such as quay cranes (QCs) and berths is taken into account. Besides the terminal allocation, the QC assignment decision is also incorporated in the proposed model. A local branching based method and a particle swarm optimization based method are developed to solve the model in large‐scale problem instances. Numerical experiments are also conducted to validate the effectiveness of the proposed model, which can save around 14% of the cost when compared with the “First Come First Served” decision rule. Moreover, the proposed solution methods not only solve the proposed model within a reasonable computation time, but also obtain near‐optimal results with about 0.1～0.7% relative gap. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 529–548, 2016