班组遥控武器站模糊自适应滑模位置控制器设计

针对班组遥控武器站位置伺服系统发射冲击力矩大、负载变化范围广和伺服精度要求高等特点,提出了一种模糊调节的位置伺服系统滑模控制策略。该策略选用了一种新型的带有积分的滑模面,模糊调节部分采用单输入双输出的结构,应用模糊规则调节新型快速终端滑模型趋近速率来削弱滑模抖振。分别进行了常值负载干扰、系统参数摄动、时变负载干扰和跟踪误差仿真实验。仿真实验表明,该控制策略的稳定性和伺服跟踪性很好,对参数摄动和负载干扰的鲁棒性很强。     

轻型反坦克导弹复合制导模式设计与仿真分析

对某型捷联惯性中制导+红外图像末制导的多用途轻型反坦克导弹的制导控制系统进行了研究,建立了制导控制方程、虚拟比例导引方程以及复合制导的交班过程方程等。结合某反坦克导弹总体参数,建立了弹体运动学模型、制导控制系统等仿真模型,并基于Matlab/Simulink和半实物仿真技术对其进行了仿真试验。试验结果表明,利用捷联惯性中制导+红外末制导复合制导的方法,可以有效提高导弹的制导精度及导弹在复杂战场上的生存能力。     

近代中国留日陆军士官生人数考究

据笔者所看到的资料,关于近代中国留日陆军士官生的人数,常出现不一致,而留日陆军士官生在近代中国的地位与作用日益得到学术界的关注。所以,本文拟从相关史料的来源、人数统计所要说明的一些特殊情况和其人数变化所反映的中日关系等方面进行梳理与考证。     

Bayesian enhanced decision making for deteriorating repairable systems with preventive maintenance

Since a system and its components usually deteriorate with age, preventive maintenance (PM) is often performed to restore or keep the function of a system in a good state. Furthermore, PM is capable of improving the health condition of the system and thus prolongs its effective age. There has been a vast amount of research to find optimal PM policies for deteriorating repairable systems. However, such decisions involve numerous uncertainties and the analyses are typically difficult to perform because of the scarcity of data. It is therefore important to make use of all information in an efficient way. In this article, a Bayesian decision model is developed to determine the optimal number of PM actions for systems which are maintained according to a periodic PM policy. A non‐homogeneous Poisson process with a power law failure intensity is used to describe the deteriorating behavior of the repairable system. It is assumed that the status of the system after a PM is somewhere between as good as new for a perfect repair and as good as old for a minimal repair, and for failures between two preventive maintenances, the system undergoes minimal repairs. Finally, a numerical example is given and the results of the proposed approach are discussed after performing sensitivity analysis. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

机械设计系列课程教改对比试验情况分析

简述了机械设计系列课程教学改革的主要思想,给出了教改教学实践环节中对比试验的具体内容。通过重点分析对比试验的量化指标,对教改进行了阶段总结,归纳了教改的若干经验,提出了存在的问题并分析了原因。     

基于DFCNN-CTC和Transformer的中文语音识别

语音识别一般只是将语音转化成文字,识别的结果是没有标点的一连串汉字,这不利于读者阅读,也会影响后续任务的处理.因此,引入语音端点检测解决上述问题.同时针对传统的语言模型N-gram存在忽略字词之间语义的相似性、训练时的参数过大等问题,提出一种以全序列卷积神经网络DFCNN作为声学模型,Transformer作为语言模型...     

海洋环境对反潜巡逻机声纳浮标搜潜装备的作战保障

反潜巡逻飞机具有快速反应能力强、航程远、留空时间长、可装备多种搜潜设备和攻潜武器以及不易受潜艇威胁的优势,已成为世界海军强国竞相发展的装备。海洋环境对航空兵反潜作战的影响巨大,能否充分利用海洋环境条件,关系到搜潜器材能否及时、有效地发现潜艇目标。主要分析了海洋环境噪声对反潜巡逻机浮标搜潜装备的作战保障问题。     

基于储备模式选择的战备物资分类研究

对战备物资进行分类是选择储备模式的基础和重要前提。把战备物资分类问题抽象为战备物资的军事性和经济性评价问题,设计了物资分类评价指标体系,并对部分指标进行了说明;利用层次分析法确定各指标的权重,运用专家打分法完成指标打分,并对专家打分程序进行优化,增强战备物资分类的可操作性,由军事性和经济性两方面的得分确定战备物资所属类别;最后通过算例证明了分类方法的有效性。     

On matched active redundancy allocation for coherent systems with statistically dependent component lifetimes

This study addresses the allocation of matched active redundancy components to coherent systems with base components having statistically dependent lifetimes. We consider base component lifetimes and redundancy component lifetimes which are both stochastic arrangement monotone with respect to a pair of components given the lifetimes of the other components. In this context, allocating a more reliable redundancy component to the weaker base component is shown to incur a stochastically larger system lifetime. Numerical examples are presented as an illustration of the theoretical results.     

国外新型预警机发展

美国陆军所建立和运维的高度复杂、全频覆盖的人力资源自动化信息系统使其能够高效的应对日常沉重的部队重组和人事变动任务,进而为其保持强大的战斗力和实时响应的全球应急部署能力提供了有力支撑。本文对美国陆军的主要人力资源数据库、人力资源自动化系统和其它自动化系统及装备进行梳理分析,以期获得对我有益借鉴。