FDI飞机舵面损伤故障全局检测的非线性数学模型

阐述了飞机在单舵面损伤故障下 ,建立故障状态下的数学模型 ,以及同样输入条件下飞机正常运动时的数学模型 ,得到飞机在相同飞行条件下损伤时的气动系数和无损伤正常时的气动系数 ,最终得到气动系数的残差。这将为以后飞机过载残差和角加速度残差奠定基础。论文中结合一定的算例给予证实推论的正确性。     

预测悬停旋翼跨音速流动的一种组合自由尾流/CFD方法

一种新的组合自由尾流 / CFD方法用于悬停旋翼流动的 CFD解中以考虑实际尾流的作用 .用文中描述的尾流分析方法研究了螺旋尖涡的运动 .首先从广义尾流模型开始 ,用半经验公式模化了涡核对旋翼尾流的作用 ;然后在环量收敛和尾迹收敛的条件下完成了自由尾迹计算 ;最后应用 Jameson有限体积龙格 -库塔推进格式求解了欧拉方程 .所得结果与相关文献和实验数据进行了比较     

温湿度传感器检定系统设计

本文介绍了利用电子扫描开关,可一次检定多只温湿度传感器的检定系统的硬件和软件设计。     

涡旋真空泵的密封设计

涡旋真空泵在工作过程中动、静涡盘之间间隙存在泄漏损失,它是影响涡旋真空泵工作性能的重要因素;总结了涡旋真空泵的工作原理;介绍了涡旋真空泵的密封设计与选择、间隙的确定。从材料和结构两方面阐述了密封的几种结构形式,说明了各自的工作原理,及需要注意的问题,阐明这些问题是影响泵性能指标的重要因素。     

论民事诉讼举证时限制度之确立

《关于民事诉讼证据的若干规定》确立了我国的民事证据举证时限制度,克服了证据随时提出主义所造成的证据突袭、恶意拖延诉讼、浪费司法资源、破坏生效判决既判力、损害诉讼程序安定性等缺陷,但现行法律规定在适用时仍有一些不足,妨碍了举证时限制度作用的发挥,对此予以归纳并提出相对应的完善措施。     

Summary of CNCOSPAR Activities 2002-2004

1 In Brief In this report, we summarize the major activities of CNCOSPAR from the year 2002to 2004. During this period, many things happened such as Beijing won the 2006COSPAR scientific assembly, the first Chinese Committee of COSPAR handed over its responsibility to the second committee, etc. During this period, the space science activities developed also very fast. China has sent its first scientific satellite, the first satellite TC-1 of the Double Star Program, into space. China also has a major break through in the manned space flight by a very successful mission of Shenzhou manned space flight. On board of this spacecraft, is the first Chinese astronaut Mr. Liwei Yang. This made China the third country in the world who has the ability that the launch manned space missions independently.     

Performance evaluation for MAP state estimate fusion

This paper presents a quantitative performance evaluation method for the maximum a posteriori (MAP) state estimate fusion algorithm. Under ideal conditions where data association is assumed to be perfect, it has been shown that the MAP or best linear unbiased estimate (BLUE) fusion formula provides the best linear minimum mean squared estimate (LMMSE) given local estimates under the linear Gaussian assumption for a static system. However, for a dynamic system where fusion is recursively performed by the fusion center on local estimates generated from local measurements, it is not obvious how the MAP algorithm will perform. In the past, several performance evaluation methods have been proposed for various fusion algorithms, including simple convex combination, cross-covariance combination, information matrix, and MAP fusion. However, not much has been done to quantify the steady state behavior of these fusion methods for a dynamic system. The goal of this work is to present analytical fusion performance results for MAP state estimate fusion without extensive Monte Carlo simulations, using an approach developed for steady state performance evaluation for track fusion. Two different communication strategies are considered: fusion with and without feedback to the sensors. Analytic curves for the steady state performance of the fusion algorithm for various communication patterns are presented under different operating conditions.     

一种可伸缩空间机械臂及其应用分析

介绍一种能够完成多关节型空间机械臂所能承担的大部分空间任务 ,而且应用更简便的可伸缩空间机械臂 ,对其空间应用做出了一些设想 ,简单讨论了其应用的一些相关问题 ,肯定了其可行性和实用性。     

减小固体火箭外壳板滚弯直线度误差的研究

如何减小固体火箭外壳板滚弯直线度误差是目前火箭生产工艺中的难题,在对最不利实际工况下三轴辊弯板机中心辊进给量沿自身轴线分布规律作系统的分析、计算及研究的基础上,推导出一项箭壳板滚弯直线度误差不等式,并针对此项不等式各参数变化规律,提出几项减小箭壳板滚弯直线度误差的行之有效的措施,可供火箭外壳设计及生产工艺人员参考。     

IC制造中平坦化技术的性能与分析

表面平整化技术是半导体工业的关键技术,在一定程度上制约着半导体芯片集成技术的发展,针对多层立体布线的IC全局平坦化技术,介绍了代表当今平整化技术及其未来的发展方向,其中一些技术会取代传统的CMP技术而成为IC产业的主导技术之一;叙述了超大规模集成电路(ULSI)的发展对全局平整化的具体要求;对传统的CMP技术的特点进行了分析;并论述了当今主流的IC平整化技术的原理、性能以及未来的发展方向。