Motion prediction of a non-cooperative space target

Capturing a non-cooperative space target is a tremendously challenging research topic. Effective acquisition of motion information of the space target is the premise to realize target capture. In this paper, motion prediction of a free-floating non-cooperative target in space is studied and a motion prediction algorithm is proposed. In order to predict the motion of the free-floating non-cooperative target, dynamic parameters of the target must be firstly identified (estimated), such as inertia, angular momentum and kinetic energy and so on; then the predicted motion of the target can be acquired by substituting these identified parameters into the Euler’s equations of the target. Accurate prediction needs precise identification. This paper presents an effective method to identify these dynamic parameters of a free-floating non-cooperative target. This method is based on two steps, (1) the rough estimation of the parameters is computed using the motion observation data to the target, and (2) the best estimation of the parameters is found by an optimization method. In the optimization problem, the objective function is based on the difference between the observed and the predicted motion, and the interior-point method (IPM) is chosen as the optimization algorithm, which starts at the rough estimate obtained in the first step and finds a global minimum to the objective function with the guidance of objective function’s gradient. So the speed of IPM searching for the global minimum is fast, and an accurate identification can be obtained in time. The numerical results show that the proposed motion prediction algorithm is able to predict the motion of the target.     

Theoretical prediction of thermal diffusion coefficients for ternary hydrocarbon mixtures based on the irreversible thermodynamics theory

An accurate thermodiffusion model is of paramount importance to the petroleum industry for the prediction of the compositional variation in hydrocarbon reservoirs. Several theoretical models have been developed. Kempers and Firoozabadi models are the latest two models, which are not only applicable for binary mixtures but also for multi-component mixtures. In this paper, we applied the Firoozabadi model to a ternary hydrocarbon mixture of n-Dodecane, n-Butane and Methane with different mass fraction. It reveals that the accuracy of the thermal diffusion coefficients for a specific mixture of interest relies on the accuracy of the thermodynamic properties from equations of state, corresponding Fick's diffusion coefficients, and the thermal diffusion modeling.     

SQL Server数据移动方法初探

随着网络技术和数据库技术的发展,一方面需要将已开发的小型数据库系统集成到以C/S或B/S为基础的SQL Server、Oracle大型数据库上,这就涉及到如何将小型数据库中的数据转移到大型数据库系统中的问题;另一方面在大型数据库之间也存在着数据移动。文章初步探索SQL Server中数据移动的方法。     

PREPROCESSING AND POSTPROCESSING SYSTEM FOR FINITE ELEMENT COMPUTATION

研究了有限元计算中的单元自动划分、曲线处理、节点疏密处理、载荷自动分布、与优化设计的衔接和等应力线绘制等方面的技术问题，阐述了有限元平面八节点单元前后置处理软件的设计过程。     

推进网络建设 加强应用工作

计算机网络是计算机应用的支撑。洪都航空工业集团公司的计算机地计算机网络发展不断提出新的需求，推动了公司网络建设的发展。本文介绍了公司计算机网络建设的几个阶段。公司现已建成的网络为公司的计算机应用、公司信息化建设提供了良好的环境。同时提出了加强计算机应用工作的几点建议。     

可控高温管式检定炉的设计及制造

介绍了高温管式检定炉的设计、制造过程及其控制方法，并给出了系统调校的过程及相关的实验参数。     

过盈配合公差优化的有限元分析

采用有限元分析软件ANSYS,以我厂某型号卫星天线的轴承套为实例,对其在过盈装配条件下,进行了力学分析,并研究了影响轴承套内径收缩量的各个因素,最后提出优化轴承套内径公差的方法,对提高我厂机械设计和装配工艺性效率具有实质性的指导意义。     

芳纶纸基复合材料研究进展及关键技术

论述了芳纶纸基复合材料的国内外研究发展状况，主要成分芳纶短切纤维和芳纶沉析纤维的结构、特点及其合成工艺，介绍了芳纶纸基复合材料在航天航空领域的应用情况，并就其开发过程中所涉及的关键技术进行了分析总结。     

联接翼布局低速纵向气动特性研究

本文基于低速风洞纵向测力以及涡格法的理论计算结果，初步研究了联接翼布局的低速 向气动特性，并与相应的机翼、尾翼相分离的正常布局的试验结果作了比较。结果表明，联接翼布局具有许多优点，如较大的升力线斜率Ｃ、较大的最大升力系数Ｃｙｍａｘ、较大的纵向稳定度、相当小的诱导阻力Ｃｘｉ和较高的巡航或阻比Ｋ，以及具有直接升力和直接侧力控制的可能性。文章还表明在联接翼前部配置鸭翼对进一步提高和改善其纵向气动性能的可     

表面张力贮箱液体管理装置的网络分析

用修正迭代法和Newton－Raphson法，对表面张力贮箱的液体管理装置进行了网络分析计算和技术分析，确定了表面张力贮箱满足微重力或低重力下无泡排液条件时，液体管理装置中的收集器筛网尺寸、气泡陷井通气管尺寸，比较了不同介质的蓄流能力。