测速定位系统的研究

测速定位系统是高速磁浮列车牵引和运行控制基础,与轮轨列车的系统相比,存在着如悬浮间隙波动、长定子轨道接缝及非接触式绝对位置读码等可能影响系统正常运行的特殊问题.为了降低悬浮波动对相对位置检测的影响,提出了利用悬浮间隙归一化处理相对位置检测信号的方法,使输出统一变换为8mm悬浮间隙下的信号,达到了磁极相角精度2.8°的检...     

联合机动编队多源信息感知网络价值分析

为了真正认清联合机动编队多源信息感知网络的理论价值,按照复杂网络理论的网络连接方式,定性分析了多源信息感知系统的网络拓扑结构,并应用小世界模型(WS)建立了多源信息感知网络价值增益模型,然后进行了实例仿真分析.研究结论对联合机动编队多源信息感知网络的建设与运用有一定的启示.     

Optimal pricing and inventory control policy in periodic‐review systems with fixed ordering cost and lost sales

This paper studies a periodic‐review pricing and inventory control problem for a retailer, which faces stochastic price‐sensitive demand, under quite general modeling assumptions. Any unsatisfied demand is lost, and any leftover inventory at the end of the finite selling horizon has a salvage value. The cost component for the retailer includes holding, shortage, and both variable and fixed ordering costs. The retailer's objective is to maximize its discounted expected profit over the selling horizon by dynamically deciding on the optimal pricing and replenishment policy for each period. We show that, under a mild assumption on the additive demand function, at the beginning of each period an (s,S) policy is optimal for replenishment, and the value of the optimal price depends on the inventory level after the replenishment decision has been done. Our numerical study also suggests that for a sufficiently long selling horizon, the optimal policy is almost stationary. Furthermore, the fixed ordering cost (K) plays a significant role in our modeling framework. Specifically, any increase in K results in lower s and higher S. On the other hand, the profit impact of dynamically changing the retail price, contrasted with a single fixed price throughout the selling horizon, also increases with K. We demonstrate that using the optimal policy values from a model with backordering of unmet demands as approximations in our model might result in significant profit penalty. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

The stochastic joint replenishment problem: A new policy,analysis, and insights

In this study, we propose a new parsimonious policy for the stochastic joint replenishment problem in a single‐location, N‐item setting. The replenishment decisions are based on both group reorder point‐group order quantity and the time since the last decision epoch. We derive the expressions for the key operating characteristics of the inventory system for both unit and compound Poisson demands. In a comprehensive numerical study, we compare the performance of the proposed policy with that of existing ones over a standard test bed. Our numerical results indicate that the proposed policy dominates the existing ones in 100 of 139 instances with comparably significant savings for unit demands. With batch demands, the savings increase as the stochasticity of demand size gets larger. We also observe that it performs well in environments with low demand diversity across items. The inventory system herein also models a two‐echelon setting with a single item, multiple retailers, and cross docking at the upper echelon. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

一体化联合作战装备保障训练内容体系创新研究

从剖析一体化联合作战的基本特点及其装备保障需求入手,阐明了装备保障训练内容体系设计的理论依据和基本原则;结合部队装备保障训练实际,提出了一种基于任务需求、围绕保障活动、面向一体化过程的设计方法,并运用此方法,构建了装备保障训练内容体系结构模型及框架,以期为装备保障训练转型提供理论借鉴。     

一体化联合作战中信息流作用研究

以复杂系统理论为基础,从动力学角度出发,阐述了如何以信息流变化为依据、以相空间重构为手段,对作战系统状态转移轨迹进行反演计算,进而预测态势发展趋势的构想。同时针对一体化联合作战的“联合增效”作用,讨论信息流协调作用对一体化联合作战组织结构有序度的影响,建立了基于信息流协调度评价的一体化联合作战要素优化组合模型。     

一体化装备保障指挥体系的内涵及结构模型

在分析、界定一体化装备保障指挥体系相关概念的基础上,建立了一体化装备保障指挥体系结构模型,并且围绕未来信息化条件下联合作战装备保障的需求,探讨了构建一体化装备保障指挥体系亟待解决的问题及对策.     

多体结构连接部件的有限单元模型

针对多体结构中连接部位带来的运动不连续问题 ,提出了将连接部件不作节点处理而作单元看待的设想。从力学基本原理出发推导了单元的刚度矩阵与阻尼矩阵 ,并由拉格朗日方程推导了这种单元的平衡方程     

基于委托模式的多分辨率联合仿真

多分辨率联合仿真是实现多层次、多视角仿真的有效方法之一。现有多分辨率联合仿真模式存在一致性偏差和仿真剧情割裂问题,从而影响仿真的有效性。为此,提出基于委托模式的多分辨率联合仿真思路,该模式下能够较好地避免仿真剧情割裂问题,同时降低一致性问题的解决难度。通过实例验证,该方法较好地适用于大规模作战和局部作战行动的多分辨率联合仿真。     

编队对地攻击联合火力分配问题的Swt-opt算法

根据未来战争中编队对地攻击的特点,运用一致算法(consensus algorithm)的思想对Swt-opt算法进行改进,解决关于传感器-武器-目标的联合火力分配问题。改进算法继承了Swt-opt算法解决资源分配问题在通信、计算以及对战场态势的容错能力方面的优势,克服了Swt-opt算法受限于网络拓扑结构的缺点。最后,证明了改进算法的可行性,并运用Matlab对改进算法进行了仿真实现。