某遥感卫星多载荷转动部件动态磁场对卫星磁矩的影响研究

卫星多载荷转动部件工作态下,磁性呈多极化形态,产生动态磁场。多个动态磁场叠加后,会导致卫星整器各向磁矩发生周期性变化,即磁矩波动。磁矩波动的振幅取决于各器载转动部件的数量、转动频率、固有磁矩大小以及载荷工作电流。文章以某遥感卫星动态磁场数据为模型,通过测试分析卫星整星及主要转动部件的磁场和磁矩,掌握了卫星及转动部件单机动态磁场的变化规律和特征,揭示了动态磁场导致磁矩波动的原因。研究成果可为类似多转动部件遥感卫星的磁性设计和控制提供参考。     

无人机航迹规划技术研究及发展趋势

通过对无人机航迹规划的研究,构建了无人机航迹规划的结构框架;分析了无人机系统约束及威胁场约束,探讨了无人机航迹几何建模方法及规划算法的国内外研究概况;并着重分析了规划算法。最后,阐述了无人机航迹规划面临的关键问题及发展趋势。     

加工复杂零件的高端技术

瑞士加工中心制造商威力铭-马科黛尔公司着重于质量和生产效率,主要活跃于航空/航天、精密机械、钟表和医疗行业,并以其为用户提供的高性能交钥匙解决方案而著称.     

对接综合试验台轨迹规划算法研究

为实现模拟空间两飞行器对接动力学过程的对接综合试验台的平稳对接,提出了一种基于加速度控制的轨迹规划算法。给出了不同初始条件下的规划方法,以及时转动自由度的特殊处理。物理试验结果表明,规划模型能精确控制平台从初始零位运动到主被动对接机构初次接触位置,且最后时刻平台姿态与对接试验的初始条件完全吻合。该算法可直接用于对接综合试验台的控制。     

Frontier days in space: are they over?

The concept of space as a frontier to be conquered remains extremely powerful, especially for the USA. This viewpoint argues that it is outmoded and in urgent need of replacement. In particular, the pursuit of profit, responsible for colonization and damaging exploitation in the past, and which has resulted in the trend for highly expensive space infrastructure projects, some of which may never fly, must be tempered. Space exploration should concentrate rather on promoting learning and intellectual growth.     

The astrobiology primer: an outline of general knowledge--version 1, 2006

The Astrobiology Primer has been created as a reference tool for those who are interested in the interdisciplinary field of astrobiology. The field incorporates many diverse research endeavors, but it is our hope that this slim volume will present the reader with all he or she needs to know to become involved and to understand, at least at a fundamental level, the state of the art. Each section includes a brief overview of a topic and a short list of readable and important literature for those interested in deeper knowledge. Because of the great diversity of material, each section was written by a different author with a different expertise. Contributors, authors, and editors are listed at the beginning, along with a list of those chapters and sections for which they were responsible. We are deeply indebted to the NASA Astrobiology Institute (NAI), in particular to Estelle Dodson, David Morrison, Ed Goolish, Krisstina Wilmoth, and Rose Grymes for their continued enthusiasm and support. The Primer came about in large part because of NAI support for graduate student research, collaboration, and inclusion as well as direct funding. We have entitled the Primer version 1 in hope that it will be only the first in a series, whose future volumes will be produced every 3-5 years. This way we can insure that the Primer keeps up with the current state of research. We hope that it will be a great resource for anyone trying to stay abreast of an ever-changing field.     

对接综合试验台控制系统软件快速原型开发技术

对基于快速原型设计睁对接综合试验台控制系统软件开发进行了研究。介绍了根据系统方案进行的中央控制台软件设计和模型计算机软件开发等。给出了快速原型设计,以及包括接口设计、配置管理、文档管理等软件工程化管理等关键技术。