无人机神经网络动态逆控制器设计研究

针对无人机动态逆控制器存在的明显缺陷,采用在线神经网络对逆误差进行补偿,设计了神经网络动态逆控制器.构造了一种单隐层神经网络结构,证明了整个闭环系统的稳定性,给出了稳定的在线神经网络权值调整算法.通过仿真验证了该方案的鲁棒性、对故障的适应性以及在作动器纯延时下的响应性能,证明了在线神经网络对动态逆控制器具有明显的改善作用.对于无人机先进飞行控制系统的设计研究具有重要的参考价值.     

某型直升机航空电子系统地面模拟试验仿真平台研究

本文介绍了某型直升机地面模拟试验应用 RT-LAB 集成环境进行地面仿真试验的过程;并阐述了RT-LAB 仿真平台的设计思想和应用前景。     

浅谈理工类专业教师的教书育人工作

在新的历史时期，面对新世纪复杂多变的国际形势和我们面临的艰巨的历史任务，高等教育如何全面实现培养高素质人才的崇高目标，这是关系到建设有中国特色社会主义事业的命运和前途的历史性课题，教师作为人类灵魂的工程师，不失时机地寻找合适的途径做好教书育人工作，这是对教师的基本要求，也是教师的职业道德和责任。     

Article

This is a slightly edited version of the Executive Summary of a joint report on cooperation in space science produced by the Space Studies Board of the USA National Research Council and the European Space Science Committee of the European Science Foundation. Using analysis of 13 case-study missions it reviews 30 years of joint missions and makes 14 recommendations based on its findings. These include the importance of setting a scientific rationale for each mission and of ensuring that objectives are shared by engineers and others involved in it, the need for independent periodic assessments and that all agreements should specify the scope, expectations and obligations of the respective agencies and relevant partners.The USA and Europe have been cooperating in space science for more than three decades. This history of cooperation has survived significant geopolitical, economic and technological changes, such as the end of the Cold War, the pressure of budget reductions and the increasing focus on economic competition and the global marketplace. Both Europe and the USA have learned from one another and acquired a knowledge base as well as an infrastructure to implement joint missions and research activities. More importantly, the decades of cooperative space research efforts between the USA and Europe have built a community of scientists whose joint scientific exchanges have established a heritage of cooperation on both sides of the Atlantic.The scientific fruits of this heritage are plainly evident in achievements such as a signature for supermassive black holes provided by the Hubble Space Telescope (HST); the first views of the solar atmosphere and corona illuminated by the Solar and Heliospheric Observatory (SOHO); the sharing of expensive research facilities on the International Microgravity Laboratory (IML); and the impressive data on ocean altimetry from the Ocean Topography Experiment (TOPEX-POSEIDON) mission, which is significantly improving our understanding of global ocean circulation.There were no guideposts for the emergence of space science cooperation between Europe and the USA. In the process of introducing new procedures and improvements to facilitate cooperation, missteps occurred, and there were political, economic and scientific losses. This report takes stock of US–European history in cooperative space endeavors, the lessons it has demonstrated and the opportunities it suggests to enhance and improve future US–European cooperative efforts in the sciences conducted in space.     

西班牙机床,成功源于信任

西班牙机床制造商协会(AFM)代表了近百家机床制造企业,是一个拥有强大经济实力的协会。协会中的企业占据了西班牙机床总产能的92%,地域分布集中,周围辅以强大的辅助产业,因此极具竞争力。     

基于Η∞和μ综合的Stewart平台柔性铰链主动杆多目标鲁棒主动振动控制(英文)

新一代空间望远镜、空间激光通信平台及其他敏感载荷要求超静力学环境,传统被动减振无法满足要求,主动振动控制是一种有效的方法,Stewart平台主被动混合隔振被广泛研究。本文分析了立方Stewart隔振器6个主动杆之间的耦合特性,建立了单个主动杆的刚弹耦合动力学模型,并在模态空间中去掉刚体模态。考虑建模不确定性及传感器噪声,利用不含刚体模态的单杆动力学模型,进行多目标Η∞和μ综合控制器设计,对于低频指向控制信号进行保持,而对高频扰动进行抑制。而后对控制器进行鲁棒稳定性测试和分析,并对控制器进行了模型降阶,最后用μ降阶控制器对标称系统进行时域仿真,并与 PI 控制器比较。结果指出μ控制器达到了低频指向信号保持和高频扰动抑制的指标要求。     

TOPOLOGY OF CONFIGURATION SPACE FOR A THREE-BODY PROBLEM

考虑了限制在球面Ｓ２上运动的三个质点的力学系统，该系统的构型空间是Ｓ２上的一个纤维丛。本文证明了这个丛的第１陈省身示性类等于－２ｃ１（γ），其中γ是复射影空间ＣＰ１＝Ｓ２上的典范线丛。这个结果蕴涵该构型空间是Ｓ２上的非平凡丛。由此又算出了它的上同调群与同伦群。此外还讨论了上述拓扑性质对于诸如平衡位置的数目，周期轨道及约化相空间等涉及系统大范围性状的影响。     

Analysis of CHARTER Applied for Yushu Earthquake Relief

Natural disasters are common threats to all human beings. With the background of global climate change, major natural disasters have occurred frequently in the last few years and caused heavy casualties with high property losses. Satellite Earth ob-servation has been playing a more and more important role in monitoring and     

综合火力/飞行控制系统火飞耦合器设计技术研究

为提高武器的攻击精度、延长可攻击时间，本文建议了IFFC系统中的空-空射击作战模态，研究了火飞耦合器的基本结构及其参数优化设计方法，提出了一种以随机射线优化方法和IFFC系统数字仿真相结合的离线寻优的参数设计策略。在寻找过程中采用了以减小脱靶量为优化准则的目标函数。数字仿真表明，优化后的IF-FC系统的可攻击时间延长了30％，攻击精度提高了约50％。本文所提出的设计准则与方法对其它非空-空射击模态的IFFC系统仍有普遍意义。