The bottleneck problem with minimum quantity commitments

Given an edge‐distance graph of a set of suppliers and clients, the bottleneck problem is to assign each client to a selected supplier minimizing their maximum distance. We introduce minimum quantity commitments to balance workloads of suppliers, provide the best possible approximation algorithm, and study its generalizations and specializations. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

反辐射无人机需求和效能分析

反辐射无人机是压制、摧毁敌防空系统的重要硬杀伤手段。从需求上阐述了发展反辐射无人机的重要性,分析了其突出的特点;并通过对反辐射无人机的作战效能分析,理论说明了利用反辐射无人机攻击敌方雷达预警系统、防空系统的可行性。     

旋转飞行器非线性运动稳定性判据

在弹体坐标系和准弹体坐标系中建立了旋转飞行器角运动数学模型。应用李亚普诺夫第一近似理论和劳斯-霍尔维茨方法导出了旋转飞行器的非线性运动稳定性判据,这个判据可应用于有控旋转导弹的运动稳定性分析,也可应用到炮弹和火箭弹上。     

装甲车辆工况监测参数的选择

为提高装甲车辆工况监测工作的规范性和可操作性,文章在对典型的履带式装甲车辆状态监测参数及技术性能检验方法的研究和分析的基础上,提出了在工况监测过程中,监测参数的选择方法和依据,并提出了典型的装甲车辆各机械系统工况参数。     

装甲装备工况监测与智能车务管理系统研究

介绍了一种装甲装备技术状况监测与智能车务管理系统。该系统由管理计算机及局域网络、车载装备工况监测模块(灰匣子)、手持式数据采集器等部分构成,各主要硬件单元间全部采用蓝牙模块实现无线通信,辅以数据库技术、局域网技术,实现了装备车务管理的信息化和智能化,并在实际中得到了具体的应用。应用结果显示,该系统实现了装备工况监测和车务管理的最基础的数据采集,为实现参数信息化奠定了良好的基础。     

Flexibility and complexity in periodic distribution problems

In this paper, we explore trade‐offs between operational flexibility and operational complexity in periodic distribution problems. We consider the gains from operational flexibility in terms of vehicle routing costs and customer service benefits, as well as the costs of operational complexity in terms of modeling, solution methods, and implementation challenges for drivers and customers. The period vehicle routing problem (PVRP) is a variation of the classic vehicle routing problem in which delivery routes are constructed for a period of time; the PVRP with service choice (PVRP‐SC) extends the PVRP to allow service (visit) frequency to become a decision of the model. For the periodic distribution problems represented by PVRP and PVRP‐SC, we introduce operational flexibility levers and a set of quantitative measures to evaluate the trade‐offs between flexibility and complexity. We develop a Tabu Search heuristic to incorporate a range of operational flexibility options. We analyze the potential value and the increased operational complexity of the flexibility levers. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

The impact of manufacturer rebates on supply chain profits

Manufacturer rebates are commonly used as price discount tools for attracting end customers. In this study, we consider a two‐stage supply chain with a manufacturer and a retailer, where a single seasonal product faces uncertain and price‐sensitive demand. We characterize the impact of a manufacturer rebate on the expected profits of both the manufacturer and the retailer. We show that unless all of the customers claim the rebate, the rebate always benefits the manufacturer. Our results thus imply that “mail‐in rebates,” where some customers end up not claiming the rebate, particularly when the size of the rebate is relatively small, always benefit the manufacturer. On the other hand, an “instant rebate,” such as the one offered in the automotive industry where every customer redeems the rebate on the spot when he/she purchases a car, does not necessarily benefit the manufacturer. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

A branch‐and‐price algorithm for a targeting problem

In this paper, we consider a new weapon‐target allocation problem with the objective of minimizing the overall firing cost. The problem is formulated as a nonlinear integer programming model, but it can be transformed into a linear integer programming model. We present a branch‐and‐price algorithm for the problem employing the disaggregated formulation, which has exponentially many columns denoting the feasible allocations of weapon systems to each target. A greedy‐style heuristic is used to get some initial columns to start the column generation. A branching strategy compatible with the pricing problem is also proposed. Computational results using randomly generated data show this approach is promising for the targeting problem. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

基于乘波构形的跨大气层飞行器气动布局

利用乘波构形具有升阻比大的特点,将其作为滑翔跳跃式跨大气层飞行器的基准外形进行研究,提出了乘波构形的设计方法,详细分析了各设计参数对乘波构形的影响,研究了不同马赫数、不同优化目标下得到的乘波体的性能,得到了升阻比大、容积效率高的跨大气层飞行器气动布局,所得结论对跨大气层飞行器气动布局和乘波体外形的研究具有一定的参考价值。     

轮式车辆半主动悬架建模与仿真

通过实际采样获得路面离散高程序列,在频域内对路面高程进行分析,获得了路面功率谱密度曲线,并作为仿真路面输入。对轮式车辆悬架系统进行线性化分析,并建立了车辆二自由度1/4车主动控制模型。采用线性二次型经典最优控制理论(LQR)对模型进行控制,应用M atlab软件进行仿真分析,结果显示了控制策略的有效性及模型的准确性。