基于DXC的军事传送网恢复策略研究

可靠性对于军事传送网而言显得尤为重要。数字交叉连接(DXC)设备提供了一个灵活的冗余和保护以满足用户的需求,有利于最小化服务中断时间。文中首先介绍了DXC设备及其应用;其次,讨论了基于DXC设备的恢复应该考虑的问题;最后,结合军事传送网的特点,提出了恢复策略,并对此进行了讨论。     

随舰备件需求分析中维修策略问题

分析了面向任务保障性工程理论指导下的舰船随舰备件配置问题,就最大、最小两种维修策略下随舰备件配置问题进行了研究,给出了面向任务的随舰备件需求分析仿真模型框架,结合算倒,研究了最大维修策略与最小维修策略的适用时机:在任务确定且任务结构函数明确条件下,应采用最小维修策略;否则采用最大维修策略.     

The practice of strategy: South African defence in stasis

The article concerns the strategy development processes of the South African Department of Defence in South Africa. It intends to identify the probable causes of the observed failure of the South African National Defence Force to develop appropriate departmental policy and military strategy. Military strategy comprises force development, force employment, force deployment and the coordination of these elements in pursuit of national, grand-strategic objectives. (See Dennis M. Drew and Donald M. Snow, Making Twenty-first Century Strategy: An Introduction to Modern National Security Processes and Problems Montgomery, AL: Air University Press, Maxwell Air Force Base, November 2006, 103). Of these four constructs, the article concerns itself only with the first two. The article analyses two complementary approaches to strategy formation: a resource-driven, inside-out model and an interests-driven, outside-in method. The article concludes that the Department is preoccupied with the inside-out method to the lasting detriment of the declared strategic intent of the defence policy.     

Adjacency‐based local top‐down search method for finding maximal efficient faces in multiple objective linear programming

It is well‐known that the efficient set of a multiobjective linear programming (MOLP) problem can be represented as a union of the maximal efficient faces of the feasible region. In this paper, we propose a method for finding all maximal efficient faces for an MOLP. The new method is based on a condition that all efficient vertices (short for the efficient extreme points and rays) for the MOLP have been found and it relies on the adjacency, affine independence and convexity results of efficient sets. The method uses a local top‐down search strategy to determine maximal efficient faces incident to every efficient vertex for finding maximal efficient faces of an MOLP problem. To our knowledge, the proposed method is the first top‐down search method that uses the adjacency property of the efficient set to find all maximal efficient faces. We discuss this and other advantages and disadvantages of the algorithm. We also discuss some computational experience we have had with our computer code for implementing the algorithm. This computational experience involved solving several MOLP problems with the code.     

大容量储能发电机并联运行励磁控制算法

大容量储能发电机作为脉冲电源，整流后通过逆变器向大功率脉冲负载供电。采用储能发电机直流侧并联方式工作，可以有效提高系统带载能力与可靠性。当并联运行的储能发电机转速不同时，根据转速合理分配电机释放功率可以有效提高系统工作效能，因此需要设计一种具有功率调节功能的励磁控制算法。在电压、电流双闭环控制的基础上，引入功率前馈控制，推导并求解了前馈功率与励磁电流关系以及控制参数，并根据电机初始转速设计了功率分配算法。仿真试验结果表明，功率前馈控制在励磁控制过程中起主导作用，有效分配储能电机释放功率大小，提高了励磁电流响应速度，抑制了负载功率扰动对励磁控制系统的影响。     

基于优先权的分布式网络设备智能轮询策略研究

针对大型网络其地域分布广,监测对象较多,监测周期过长,实时性较差且管理流量负载较大等问题,提出一种分布式网络设备智能轮询策略。在域内,针对轮询周期调整问题,通过构造体现管理者意志的评判矩阵和求解反映数据特征的DFT(离散傅立叶变换)确定轮询优先级和轮询周期取值范围,提出了基于变化率的轮询周期调整算法;在域间,通过触发和查询实现对特殊事件的采集。最后进行了仿真,表明该策略能够在减轻网络负载的同时,准确刻画网络的状态。     

挠性接管在轴对称载荷下的应力应变计算

针对目前挠性接管强度计算存在的不足,在充分考虑骨架层的弯曲刚度和扭转刚度对挠性接管强度影响的基础上,推导出在承受轴对称负荷(拉压、扭矩及内压)时,挠性接管及其加强筋的应变和外力的关系,为挠性接管的结构设计和强度计算提供了理论公式.     

设备管理系统的排队论分析

该文应用排队论的理论分析了设备损修系统中最优设备的解法。     

基于NNLI技术的齿轮箱故障诊断

将NNLI技术应用到齿轮箱的故障诊断中,提出了基于NNLI的特征提取方法,并将该方法与神经网络结合起来,进一步提出基于NNLI特征提取的神经网络故障诊断方法,给出了两种不同的网络分类器,通过齿轮箱故障诊断实例验证了该方法的有效性。     

基于BP神经网络带调压器直流发电机特性的辨识

为使坦克直流发电机的调压特性实验能够在计算机上仿真进行,节约教学实验成本,可利用神经网络对直流发电机的调压特性进行辨识,得到了比手工绘制精度更高的特性曲线.因此,调压特性的神经网络辨识法,有利于直流发电机特性实验教学.