Identification Method for RLG Random Errors Based on Allan Variance and Equivalent Theorem

An identification method using Allan variance and equivalent theorem is proposed to identify non-stationary sensor errors mixed out of different simple noises. This method firstly derives the discrete Allan variances of all component noises inherent in noise sources in terms of their different equations; then the variances are used to estimate the parameters of all component noise models; finally, the original errors are represented by the sum of the non-stationary component noise model and the equivalent model mixed out of the stationary and critically stationary component noises. Results of two examples for identification confirm the superiority of this approach regardless of the errors being stationary or not. The comparison of results of real ring laser gyro (RLG) errors processed by various methods shows that the proposed approach is more suited to depict the original noises than common ones.     

基于解析剖面的时间协同再入制导

针对高超声速滑翔飞行器再入段时间协同制导问题，提出一种基于高度-速度剖面的预测校正协同制导律。首先在高度-速度剖面内设计了参考轨迹，利用两个轨迹参数在线预测剩余飞行航程和时间；通过数值算法校正两个轨迹参数以满足航程和时间约束并求取实际控制量，结合侧向航向角走廊实现了单飞行器的时间约束再入制导。在此基础上分析了飞行器的时间可调范围，针对多飞行器协同再入任务设计了协同飞行时间和协同策略，实现了时间协同再入飞行。该策略考虑到再入过程中的通讯困难，避免了弹间通讯，且充分利用了飞行器纵向动力学，时间可控范围较大，更加适用于实际的再入过程。仿真结果说明了时间约束再入制导律对时间的可控性和协同策略的有效性。     

Development of a ground-based space micro-algae photo-bioreactor

The purpose of the research is to develop a photo-bioreactor which may produce algae protein and oxygen for future astronauts in comparatively long-term exploration, and remove carbon dioxide in a controlled ecological life support system. Based on technical parameters and performance requirements, the project planning, design drafting, and manufacture were conducted. Finally, a demonstration test for producing algae was done. Its productivity for micro-algae and performance of the photo-bioreactor were evaluated. The facility has nine subsystems, including the reactor, the illuminating unit, the carbon dioxide (CO₂) production unit and oxygen (O₂) generation unit, etc. The demonstration results showed that the facility worked well, and the parameters, such as energy consumption, volume, and productivity for algae, met with the design requirement. The density of algae in the photo-bioreactor increased from 0.174 g (dry weight) L⁻¹ to 4.064 g (dry weight) L⁻¹ after 7 days growth. The principle of providing CO₂ in the photo-bioreactor for algae and removing O₂ from the culture medium was suitable for the demand of space conditions. The facility has reasonable technical indices, and smooth and dependable performances.     

阳光灿烂的日子一群背包客的西藏春节

春节是我国的传统节日、传统的节日当然有传统的玩法：家庭聚会、逛商场、看灯会……现在，越来越多的年青人正在颠覆这些“传统”。他们利用这难能可贵的大假纵情山水，笑傲江河，在大自然中放逐自我，在异地他乡感受温馨，就像有首歌唱的那样“我要飞得更高，飞得更高，像狂风一样舞蹈……”于他们而言，走出去才是真正的过节。[编按]     

CAE技术在某悬臂零件分析中的应用

结合某吹砂机设备中的悬臂吹砂杆的设计过程,探讨了基于Pro/E和AWE软件进行的静力和模态分析。通过对比表明,有限元分析结果与实际使用中的情况非常吻合。这充分说明了CAE技术是设计师的重要实际工具,其分析的数据可以作为设计的参考依据。     

集成制造环境下航空转包生产管理

针对我国航空转包生产的现状,结合多年来航空产品研制与生产的经验,以某飞机制造公司某飞机部件转包生产项目为背景,分析了目前航空转包项目管理的特点和项目管理方法,阐述了在并行工程下航空转包生产项目的复杂性产品研制模式、多层次集成计划与控制体系和项目团队管理过程,并介绍了在并行工程模式下项目管理取得的成效。     

基于层次分析法的供应商评价模型

根据层次分析法(AHP)的特点和适应性,提出了一个基于AHP法的供应商评价指标体系模型,重点分析了制约主要素层中8个关键要素,即质量、进度、价格、能力、体系、意识、信誉、关系,以及它们的子要素。最后用AHP法给出了该模型的具体应用过程,并进行了算例分析。该模型可用于从不同要素上比较系统、全面地评价供应商的整体水平,适应于各类主导企业的供应商选择。     

浅谈航空转包生产与质量管理体系

阐述了转包生产产品质量与质量管理体系的相互关系,并对转包生产的意义、质量和生产的关系、转包生产产品的质量控制和质量管理体系运行过程.的监视和测量进行了探索.     

加强写作训练提高大学英语教学综合质量

不断提高大学英语教学的综合质量是从事大学英语教学的每位教师都潜心研究探索的课题。教学实践证明,抓好写作训练是提高教学综合质量的有效手段。而英文写作向来是英语教学的难点之一。作者试图从第一学期的大学英语课开始,把英文写作训练贯穿到整个大学英语教学过程的始终,在提高学生写作能力的同时提高大学英语教学的综合质量。     

The morphology and velocity field of the large flare on the solar disc on July 14, 1980

The active region morphology and the features of solar radio bursts and sight-line velocity distribution of a flare of Importance 3B on the solar disc (AR 2562) on 1980 July 14 are introduced in this article.