基于H∞滤波技术的GPS/INS全组合导航系统研究

本文根据H∞鲁棒滤波理论，提出了基于H∞滤波技术的GPS/INS全组合导航系统。该系统仅含有位置误差、速度误差和平台误差角9维状态，并利用GPS和INS的位置、速度和姿态观测信息对全部状态进行观测，组成全松组合导航系统，由H∞滤波来提高系统的鲁棒性。文中对提出的全组合系统进行了动态仿真，仿真结果表明，该系统结构简单，状态估计精度较高，系统鲁棒性好，便于工程实现，坚实际工程应用具有重要的现实意义。     

提高控制系统可靠性惯性仪表冗余方案分析

叙述了提高控制系统可靠性惯性仪表冗余的几种典型方案，对它们的优缺点进行了分析、比较。最后，提出冗余的一般准则和注意事项。     

用渐消卡尔曼滤波器防止捷联惯导系统滤波发散

为有效防止捷联惯导系统滤波发散,根据卡尔曼滤波原理研究了滤波发散的原因,引入了渐消卡尔曼滤波和遗忘因子。对常规卡尔曼滤波器和渐消卡尔曼滤波器的滤波进行的仿真结果表明,采用渐消卡尔曼滤波器在工程上可解决捷联惯导系统滤波发散。     

波音737-300型飞机与A320系列飞机前轮转弯控制原理的比较分析

通过对比分析波音737-300和A321机型的前轮转弯控制原理,阐述机械-液压控制和电传控制两种前轮转弯方式的优缺点,为分析转弯机构出现的疑难故障提供了理论基础.     

粘度单位的换算

介绍了动力粘度，运动粘度，条件粘度的国际单位制、物理单位制以及相互之间的换算关系。     

空客A330飞机CBMU数据库客户化及其工程管理的实现

CBMU是A330飞机电源系统中一个关键组件，负责监控电子、机械多个章节系统的跳开关状态。对于CBMU数据库软件构型的管理，通常是根据具体的硬件改装工作，由相关专业系统工程师自行控制。该方式容易导致CBMU数据库软件构型变更管理失控，严重时会影响到飞行安全。本文旨在分析梳理传统管理模式的基础上，结合实际经验，探讨构建一种新的管理模式，以达到有效管理CBMU数据库软件构型的目的。     

AHP中判断矩阵元素最优估计值的误差分析

在AHP模型中，请一组专家对某一属性进行评价，通过适当的数学处理方法，可得判断矩阵元素的最优估计值，并根据残差来确定所求估计值是否达到精度要求，若不符合精度要求则需返还给专家进行重新评估。这是AHP中构造判断矩阵的一种新方法。     

Use of human wastes oxidized to different degrees in cultivation of higher plants on the soil-like substrate intended for closed ecosystems

To close mass exchange loops in bioregenerative life support systems more efficiently, researchers of the Institute of Biophysics SB RAS (Krasnoyarsk, Russia) have developed a procedure of wet combustion of human wastes and inedible parts of plants using H₂O₂ in alternating electromagnetic field. Human wastes pretreated in this way can be used as nutrient solutions to grow plants in the phototrophic unit of the LSS. The purpose of this study was to explore the possibilities of using human wastes oxidized to different degrees to grow plants cultivated on the soil-like substrate (SLS). The treated human wastes were analyzed to test their sterility. Then we investigated the effects produced by human wastes oxidized to different degrees on growth and development of wheat plants and on the composition of microflora in the SLS. The irrigation solution contained water, substances extracted from the substrate, and certain amounts of the mineralized human wastes. The experiments showed that the human wastes oxidized using reduced amounts of 30% H₂O₂: 1 ml/g of feces and 0.25 ml/ml of urine were still sterile. The experiments with wheat plants grown on the SLS and irrigated by the solution containing treated human wastes in the amount simulating 1/6 of the daily diet of a human showed that the degree of oxidation of human wastes did not significantly affect plant productivity. On the other hand, the composition of the microbiota of irrigation solutions was affected by the oxidation level of the added metabolites. In the solutions supplemented with partially oxidized metabolites yeast-like microscopic fungi were 20 times more abundant than in the solutions containing fully oxidized metabolites. Moreover, in the solutions containing incompletely oxidized human wastes the amounts of phytopathogenic bacteria and denitrifying microorganisms were larger. Thus, insufficiently oxidized sterile human wastes added to the irrigation solutions significantly affect the composition of the microbiological component of these solutions, which can ultimately unbalance the system as a whole.     

改进型测功机油门执行器的研制

在发动机试验中突然停电，极易发生发动机飞车事故，为解决此问题，研制了改进型测功机油门执行器。本文介绍了改进型测功机油门执行器的研制方法、工作原理及消除发动机飞车事故的的原理。试验证明，改进型测功机油门执行器工作安全可靠。     

3R-3URU可展单元机构及其在构架式可展天线中的应用

提出了一种空间单自由度(DOF)可展单元机构3R-3URU。首先,基于螺旋理论和修正的G-K公式分析了RURUR单闭环机构的自由度,建立了该机构中主动关节和被动关节速度之间的解析关系式,基于此关系式和3个RURUR机构共用首尾转动副的结构特点推导了3R-3URU单元机构的自由度,得到了3R-3URU机构具有1个自由度时各运动副的方向和位置满足的几何关系式。其次,将3R-3URU机构应用于3RR-3RRR四面体可展单元及其组成的球面构架式可展天线中,得到了具有收拢和调姿两种自由度的新型可展机构。最后,利用Adams软件对3R-3URU可展单元机构的自由度和其在四面体构架式可展天线中的应用进行了仿真验证。该3R-3URU可展单元机构具有单自由度、铰链种类少、结构简单等优点,可用于曲面构架式可展天线的支撑机构中,实现大折叠比。