Adaptive fault-tolerant attitude tracking control for spacecraft with time-varying inertia uncertainties

This paper is devoted to adaptive attitude tracking control for rigid spacecraft in the presence of parametric uncertainties, actuator faults and external disturbance. Specifically, a dynamic model is established based on one-tank spacecraft, which explicitly takes into account changing Center of Mass(CM). Then, a control scheme is proposed to achieve attitude tracking.Benefiting from explicitly considering the changing CM during the controller design process, the proposed scheme possesses good robustness to parametric uncertainties with less fuel consumption.Moreover, a fault-tolerant control algorithm is proposed to accommodate actuator faults with no need of knowing the actuators' fault information. Lyapunov-based analysis is provided and the closed-loop system stability is rigorously proved. Finally, numerical simulations are presented to illustrate the effectiveness of the proposed controllers.     

基于CAN的机场助航灯恒流调光系统的设计

鉴于飞机起降的安全考虑,机场需要配备助航灯来保证机场所需要的能见度,因此机场助航灯调光系统已经有很多研究者开发过.此处的调光系统是一种利用自己开发的控制模块和CAN总线相结合而设计的系统.首先介绍了机场助航灯恒流调光系统的整体硬件结构框图和各部分的硬件框图,对硬件部分作了简要的介绍;接着重点对该系统的核心部分进行了软件方面的介绍,给出了软件流程图.     

虚拟现实技术在军用直升机飞行和作战仿真中的应用

本文简要介绍了利用虚拟现实技术构建某型直升机飞行和作战仿真体系及应用方法。并重点介绍了构建高可视化的直升机飞行作战仿真系统的关键技术和实验步骤。     

Review of uncertainty-based multidisciplinary design optimization methods for aerospace vehicles

This paper presents a comprehensive review of Uncertainty-Based Multidisciplinary Design Optimization (UMDO) theory and the state of the art in UMDO methods for aerospace vehicles. UMDO has been widely acknowledged as an advanced methodology to address competing objectives of aerospace vehicle design, such as performance, cost, reliability and robustness. However the major challenges of UMDO, namely the computational complexity and organizational complexity caused by both time-consuming disciplinary analysis models and UMDO algorithms, still greatly hamper its application in aerospace engineering. In recent years there is a surge of research in this field aiming at solving these problems. The purpose of this paper is to review these existing approaches systematically, highlight research challenges and opportunities, and help guide future efforts. Firstly, the UMDO theory preliminaries are introduced to clarify the basic UMDO concepts and mathematical formulations, as well as provide a panoramic view of the general UMDO solving process. Then following the UMDO solving process, research progress of each key step is separately surveyed and discussed, specifically including uncertainty modeling, uncertainty propagation and analysis, optimization under uncertainty, and UMDO procedure. Finally some conclusions are given, and future research trends and prospects are discussed.     

二阶系统输出响应及输入信号恢复的仿真

介绍用数学方法推导出二阶系统信号恢复的计算方法，并用算法语言在计算机上模拟出当其输入信号为标准半正弦波进的输出信号，以及当输出信号为计算出的信号时模拟恢复出原输入信号，并讨论了在该算法的数学推导及模拟实验的基础上恢复动态信号的可能性。     

叠网式过滤器

提出一种农业排灌用的新型过滤器——叠网式过滤器,其结构简单且性能指标大大超过国内过滤器, 在结构、性价比上也将超过国外新型过滤器。     

解决不正常“软肋” 提升民航竞争优势——民航航班正常分析与对策

一、当前民航面临的问题 毋庸置疑，飞机作为最现代化的交通工具，其特点是快捷、舒适。据民航总局相关部门进行的市场调查表明，2004年全国旅客因快捷选择乘机出行者占81．79％，可见“快”是飞机与其他交通工具竞争的最大优势。     

高等学校人才流失实证分析

根据某财经类高校实际资料，分析了高等学校人才流失的现状和原因，提出了解决问题的对策和措施。     

用于钟罩式气体流量标准装置的计时器

介绍了利用通用计数器E312A研制的适用于钟罩式气体流量标准装置的计时器。该计时器既扩展了通用计数器的功能,又提高了计时器的准确度。     

Study on Simulated Human Load in Unmanned Spaceship

This article introduces the methods for testing and verifying the performance of a new type of oxygen supply apparatus as well as the performance of the Environment Control and Life Support System(ECLSS)in the airtight unmanned space capsule,with a simulated human load instead of animals or human in China's Manned Space Program.The simulated human load also supplies a dummy for the spaceship to instal the envirmental testing equipment,to wear spacesuit,and to match the weight in spaceship.