反卫星武器发展的相关问题研究

随着卫星在现代战争中的作用日益增强,空间已成为各国新的战略制高点.介绍了反卫星武器系统的概念及结构,并对未来反卫星武器的发展建设从技术角度进行了分析与研究,最后对当前发展反卫星武器面临的问题进行了深入的剖析.     

基于CFD与飞行动力学耦合方法的舰载直升机着舰平衡分析

将计算流体力学（Computational fluid dynamics,CFD）模型与飞行动力学模型相结合， 建立了适用于舰载直升机着舰飞行的平衡分析方法。在满足气动力计算精度的前提下,为提高计算效率，CFD模型使用Euler方程作为主控方程，并采用动量源项代替旋翼对其流场的作用。将CFD计算所得气动力对飞行动力学模型计算所得气动力进行修正迭代，并根据牛顿迭代法求解飞行动力学平衡方程，最终求得平衡参数。应用所建立的方法，首先进行了算例验证，以表明方法的有效性;然后着重对舰载直升机着舰飞行进行了平衡计算与分析，为直升机着舰飞行提供参考。     

欧美军用直升机技术发展研究

首先简要介绍了第49届巴黎航展的基本情况，然后对欧美军用直升机的发展趋势和技术特点进行了较为深入的分析，阐述了军用直升机在海上多样化行动中的作用，最后给出了几点启示。     

Space weather service activities and initiatives at LAMP (Argentinean Space Weather Laboratory group)

Since more than one decade ago, several institutions started to offer a large variety of Operative Space Weather (SWx) products. This is of major importance because Space Weather events can affect aviation communications, global positioning systems, grid electric power, satellite technologies, and human health in space. The scientific potential on solar-terrestrial physics in Argentina motivated the creation of an interdisciplinary Laboratory of Space Weather in Argentina. The Argentinean Space Weather Laboratory (in Spanish ‘Laboratorio Argentino de Meteorología del esPacio’, LAMP) was initiated in 2016, and it carries out daily monitoring of real-time information (space and ground-based instruments) on Space Weather. The information is synthesized on a weekly bulletin as a summary of the Space Weather conditions, and it is posted on a website (spaceweather.at.fcen.uba.ar). The analyzed information includes own data and of other centers that offer them publicly, and it is also analyzed and discussed later on, during monthly briefings. In particular, one of the regional products that is included in the briefing discussions and it was developed by LAMP in collaboration with INPE-EMBRACE, involves Vertical Total Electron Content (VTEC) maps in the Argentinean region. LAMP set up a Space Weather Laboratory in the Antarctic peninsula, in the Argentine Marambio base, where a Water Cherenkov radiation Detector (WCD) was installed during the Argentinean Antarctic campaign (January-March of 2019). This detector is the southern node of a Latin American Collaboration (LAGO, Latin American Giant Observatory), which is a network of WCDs installed throughout more than 10 Latin American countries.     

舰载直升机任务航电系统及建模

介绍了美国海军舰载直升机的发展,着重阐述了"海鹰"直升机的发展,概述了其先进的任务航电系统,还对"海鹰"直升机的建模进行简单说明。     

Launch and Early Operation of the MESSENGER Mission

On August 3, 2004, at 2:15 a.m. EST, the MESSENGER mission to Mercury began with liftoff of the Delta II 7925H launch vehicle and 1,107-kg spacecraft including seven instruments. MESSENGER is the seventh in the series of NASA Discovery missions, the third to be built and operated by The Johns Hopkins University Applied Physics Laboratory (JHU/APL) following the Near Earth Asteroid Rendezvous (NEAR) Shoemaker and Comet Nucleus Tour (CONTOUR) missions. The MESSENGER team at JHU/APL is using efficient operations approaches developed in support of the low-cost NEAR and CONTOUR operations while incorporating improved approaches for reducing total mission risk. This paper provides an overview of the designs and operational practices implemented to conduct the MESSENGER mission safely and effectively. These practices include proven approaches used on past JHU/APL operations and new improvements implemented to reduce risk, including adherence to time-proven standards of conduct in the planning and implementation of the mission. This paper also discusses the unique challenges of operating in orbit around Mercury, the closest planet to the Sun, and what specific measures are being taken to address those challenges.     

Reducing mission operations costs through spacecraft autonomy: the near earth asteroid rendezvous (near) experience

With a maximum time of 12 days out of ground contact and a round-trip light time as high as 56 minutes, The Near Earth Asteroid Rendezvous (NEAR) spacecraft requires a moderate degree of onboard autonomy to react to faults and safe the spacecraft. Beyond the basic safing requirements, additional functions are carried out onboard. For example, on-board calculation of the Sun, Earth, asteroid, and spacecraft positions allow the spacecraft to autonomously orient itself for science and downlink operations. On-board autonomous momentum management during cruise relieves Mission Operations from planning, scheduling, and carrying out many manual momentum dumps. During development, additional operations, such as center-of-mass management during propulsive maneuvers and optical navigation were also considered for onboard autonomy on the NEAR spacecraft, but were not selected. The allocation of functions to onboard software or to ground operations involved tradeoffs such as development time for onboard software versus ground software, resource management, life cycle costs, and spacecraft safety.After two years of cruise operations, considerable experience with the NEAR autonomy system has accrued. The utility of some autonomous capabilities is greater than expected, others less so. Software uploads increased spacecraft autonomy in some cases, and the impact on Mission Operations can be assessed. Allocation of functions between spacecraft autonomy and ground operation during development of future missions can be improved by applying the lessons learned from the NEAR experience.     

零件工艺路线决策的GA方法

将基因算法应用于ＣＡＰＰ系统中的工艺路线排序。首先，将工艺路线决策的约束工艺知识表达为四种适用度函数，用自然数字链对零件特征加工单元进行基因编码，然后，通过选种、基因重组和基因变异，对群体进行多次计算和搜索，可以寻找到合理的工艺路线，该工艺路线同时也是较优的。     

随机需求情形VRP的Hopfield神经网络解法

在涉及物资分发与收集或提供服务的诸多部门中有着各种各样的ＶＲＰ（车辆路由问题），现有的对于ＶＲＰ的研究主要集中在需求是确定性的情形。由于实际情况中需求往往是随机的，随机性需求情形ＶＲＰ的研究近年来得到了国内外学者的重视。本文利用Ｈｏｐｆｉｅｌｄ人工神经网络解组合最优化问题时计算量不随维数指数增加这一优点，针对一类随机需求情形ＶＲＰ给出了一种Ｈｏｐｆｉｅｌｄ人工神经网络解法。文中描述了相应于该ＶＲＰ     

飞机战伤抢修评估与设计方法综述

飞机战伤抢修（ABDR）是提高飞机生存力与作战能力的重要手段之一，开展战伤抢修技术研究覆盖飞机全寿命阶段。回顾了战伤抢修研究的历史和现状，分别从战伤评估、战伤抢修设计、战场维修与保障等3方面总结了战伤抢修体系要点，重点综述了战伤抢修预评估技术、战伤现场评估技术、战伤抢修设计准则与原则、战伤抢修设计与评价方法、战场快速维修技术、战场保障方法等方面的理论与研究进展。在此基础上，针对未来体系对抗与智能化作战环境，结合目前战伤抢修需求，提出了包括先进材料结构飞机战伤抢修技术、直升机战伤抢修技术、飞机战伤评估智能技术等战伤抢修技术研究需要关注和解决的问题。