贝叶斯景象匹配技术

景象匹配技术以其极高的末制导精度在导航系统中起着关键性的作用。经典的景象匹配定位方法只能提供象素级的定位精度,为了获得更高的精度可采用ＦＦＴ匹配算法、最小二乘匹配算法等。该文首次提出了一种新的贝叶斯景象匹配算法。其基本思想在于：匹配定位位置可看作为随机量,先利用匹配图像间的信息求其条件概率分布,再利用图像中的大量样本来求解其贝叶斯估计值。同时研究了基于贝叶斯估计的景象匹配技术的原理及算法,并将其与     

含不等长双裂纹无限大板应力强度因子

采用交替法求解了含任意相对位置不等长双裂纹的无限大极受均布拉应力作用的应力强度因子。此法以平面弹性力学的一个问题为基础,即含单裂纹无限大板,裂纹面受集中载荷,此问题的解已知,然后交替地满足边界条件。各种计算结果已绘成曲线。     

空间辐射器热分析

在航天飞机温控系统中,空间辐射器是最主要部件。对以航天飞机蒙皮为辐射表面的,单面翼—管式空间辐射器进行了详细的热分析,把平均翼效率代替局部翼效率,利用有限差分的方法对单面翼—管式辐射器进行了性能计算。     

叶栅绕流计算的高分辨率隐式解法

以一种性能优越的高分辨率格式为基础, 发展了其隐式解法, 提出并实现了与这种格式相适应的隐式边界处理过程, 从而显着提高了高分辨率格式的收敛速度。用不同来流条件下叶栅绕流数组计算结果与实验做了对比, 以说明解的准确程度和本文算法的效果。      

电机生产企业绿色工厂评价内容、指标及方法的研究

为积极响应《中国制造2025》以及《工业和信息化部办公厅关于开展绿色制造体系建设的通知》,针对我国目前在电机生产行业相关绿色工厂评价要求缺失的现状,结合我国电机生产企业的物料使用特点、生产工艺特点、生产装备特点、产品特点、能源利用特点、主要污染物排放特点等6个方面,对电机生产企业绿色工厂评价内容、指标及方法进行研究。该研究为我国电机生产行业全面推行绿色制造,加快电机生产行业绿色改造升级,构建电机生产行业绿色制造体系,提高我国电机生产行业的国际竞争力作出积极贡献。     

空中乘务专业双语教学初探

对空中乘务人员的素质要求越来越高,其中要求最高的就是在英语能力方面。本文基于在让乘务专业学生学习专业知识的同时,如何更有效地提高他们的英语水平,简要阐述了目前这方面教学的现状,分析了空乘专业的课程设置,并对如何实施双语教学提出了几点对策。     

CAFUC视阈下对英语专业教学改革的微观研究

英语专业是中国民航飞行学院(CAFUC)唯一的文科类专业。英语专业的教学改革是一个长期持续的课题。从CAFUC视阈角度对英语专业教学改革做出微观研究,分析了CAFUC英语专业的优劣势并预测了今后的教学思路。     

钢管混凝土柱极限承载力分析的分段合成法

在计算钢管混凝土受压构件弹塑性极限承载力的合成法基础上,提出了一种新的数值计算方法--分段合成法,计算假设仅包括平截面假设和考虑紧箍力影响的钢管混凝土的应力-应变关系,取消了原合成法中对柱变形曲线的假设,积分时不仅需要在截面上划分单元而且还需沿杆长划分单元,因而可考虑柱多个截面的平衡条件.与原合成法相比,该方法不仅适用于轴压构件和两端偏心距相等的偏压构件,而且还适用于两端偏心距不等的偏压构件的弹塑性极限承载力计算.利用提出的方法和程序,计算了圆形截面钢管混凝土轴压长柱、两端偏心距相等的偏压长柱以及两端偏心距不等的偏压长柱的弹塑性极限承载力,理论分析结果与文献中的理论结果和试验结果均吻合良好.     

Attitude Control Considering Variable Input Saturation Limit for a Spacecraft Equipped with Flywheels

A new attitude controller is proposed for spacecraft whose actuator has variable input saturation limit. There are three identical flywheels orthogonally mounted on board. Each rotor is driven by a brushless DC motor (BLDCM). Models of spacecraft attitude dynamics and flywheel rotor driving motor electromechanics are discussed in detail. The controller design is similar to saturation limit linear assignment. An auxiliary parameter and a boundary coefficient are imported into the controller to guarantee system stability and improve control performance. A time-varying and state-dependent flywheel output torque saturation limit model is established. Stability of the closed-loop control system and asymptotic convergence of system states are proved via Lyapunov methods and LaSalle invariance principle. Boundedness of the auxiliary parameter ensures that the control objective can be achieved, while the boundary parameter’s value makes a balance between system control performance and flywheel utilization efficiency. Compared with existing controllers, the newly developed controller with variable torque saturation limit can bring smoother control and faster system response. Numerical simulations validate the effectiveness of the controller.     

Analysis of data of “Clementine” and “KAGUYA” missions and “ULCN” and “KSC-1162” catalogues

In this paper an analysis of data coordinate systems from selenographic catalogues and space missions was carried out. The lunar macrorelief models were made on basis of the software package ASNI USTU using method of the spherical harmonic expansion. These models accurately describe the global features of the lunar figure. To construct these models the following sources of topographic information were used: “Clementine” and “KАGUYА” (Selena, Japan mission) missions, “KSC-1162” (Kazan selenocentric catalogue), “Kiev” (selenodesic catalogue), “SAI” (Chuikova (1975)), “Bills, Ferrari”, “ULCN” (The Unified Lunar Control Network 2005). Direct comparison hypsometric information “KSС-1162” catalogue data with “Clementine” mission was carried out. These researches confirmed a good agreement of the hypsometric information of compared systems. The normalized coefficients were obtained on basis of the hypsometric information expansion for eight sources. The displacement of the lunar center of mass (LCM) relatively to the lunar center of figure (LCF) was obtained by using topographic data selenodetical catalogues and space missions.