强迫振荡理论

本文给出了基于基本守恒方程的一维轴向稳定分析。分析方法与经典方法不同,区别在于利用一些显式关系项来说明在固体推进剂火箭发动机中声学系统与各种结构、燃烧和呈现的流动现象之间的相互作用。此外,本文处理控制方程的方式也与经典的方法不同,即得到声学系统正态模型的稳定性余量和固有频率的方法与经典方法不一样。本文给出了用这种分析方法研究相互作用的一个例子。这就是试验台轴向振动与声学系统压力振荡之间的相互作用。结果表明,如果振荡频率和振幅需要精确地确定的话,各单个系统即声学和试验台结构不能再单独地考虑。     

用于定常二维跨声速喷管流动分析的N—S解程序

本文介绍了用于分析平面和轴对称定常跨声速喷管流动的有效的Navier—Stokes解算法。本法是利用跳格数值算法在物理上取的坐标中求解守衡型非定常可压缩N—S方程。分析了几种定常跨声速粘性喷管层流,给出了计算结果,并与实验结果进行比较,证实了数值方法的精度和效率。     

Biomedical program of the ALTAIR french russian flight onboard the MIR station

One year after the achievemant of the 2 weeks ANTARES french-russian mission in the MIR station in July 1992, a 22 days ALTAÏR mission with a french cosmonaut has been performed in July 1993, making use of the scientific payload remaining on board. Taking benefit of the analysis of the previous mission, the experimental protocols were adapted to refine scientific objectives and gave to the scientists the opportunity to enhance quantitatively and qualitatively their results. The french biomedical program, conducted in close scientific cooperation with IMBP and associated laboratories, was composed of 8 experiments out of which 2 were new with regards to the ANTARES program. In the field of cardio-vascular physiology and fluid regulation, the experiments: ORTHOSTATISME, DIURESE have been renewed and complemented by the TISSU experiment (proposed by a german scientist) and a real-time tele-assistance program using US echography technic and ground support from the french CADMOS support control center located in Toulouse. With respect to neurosciences objectives, to the experiments VIMINAL (cognitive processes) and ILLUSIONS (study of proprioceptives cues), was added the SYNERGIES experiment to analyse the postural adjustements during movement. The IMMUNOLOGIE experiment carried on and the radiobiological experiment BIODOSE ended.

Adding the results of the 2 missions ANTARES and ALTAÏR, and the data obtained in between onboard with russian cosmonauts, the scientists have received a wealth of physiological data and gained reproducibility and confidence in their results.     

航天发动机推进—现状报告

自1974年以来,根据赛奥科尔公司提出的计划,用静态点火试车验证了顶级火箭发动机设计的主要进展。发动机弹道性能的改进和质量比的提高,在装药量为450—1650公斤,直径为0.7、0.9和1.2米的几种发动机上得到了验证。大多数技术改进都用设计的每种发动机进行几台静态点火试验验证过,并且根据合同正在研制的近地点和远地点发动机采用了这些技术。这些改进包括:端羟基聚丁二烯(HTPB)复合推进剂;柱槽型的药柱设计;碳—碳出口锥的深潜入喷管;在喷管潜入部分周围安装一个环形的小火箭式点火器和低密度三元乙丙橡胶(EPDM)壳体绝热层。     

高速通用遥测计算机系统的新体系结构

遥测计算机系统有如下一些重要的发展趋势:1.码速率更高。2.数据格式更复杂。3.硬件预处理与压缩。4.速度更快、适应性更强的通用计算机接口。5.32位计算机系统。6.用小型专用辅助计算机执行例行任务。7.灵活的显示装置和显示服务。本文叙述顺应上述趋势的系统体系结构。模块化设备提供了高速数据通过率,适应复杂格式,与现代32位计算机相容。     

The Urey instrument: an advanced in situ organic and oxidant detector for Mars exploration

The Urey organic and oxidant detector consists of a suite of instruments designed to search for several classes of organic molecules in the martian regolith and ascertain whether these compounds were produced by biotic or abiotic processes using chirality measurements. These experiments will also determine the chemical stability of organic molecules within the host regolith based on the presence and chemical reactivity of surface and atmospheric oxidants. Urey has been selected for the Pasteur payload on the European Space Agency's (ESA's) upcoming 2013 ExoMars rover mission. The diverse and effective capabilities of Urey make it an integral part of the payload and will help to achieve a large portion of the mission's primary scientific objective: "to search for signs of past and present life on Mars." This instrument is named in honor of Harold Urey for his seminal contributions to the fields of cosmochemistry and the origin of life.     

先进航空航天计量解决方案

为适应航空制造企业对于构建数字化企业的要求,海克斯康计量产业集团早在2003年就开始进行企业计量解决方案(EMS)的规划与实施。具体来说,利用计算机数据库和网络技术,利用坐标测量这种数字化的装备,配合具有强大CAD功能的通用测量软件PC-DMIS,实现了从产品设计、加工过程、产品质量控制到全球质量报告的数据系统完美无纸化闭环。     

本刊编辑部举办"兼职责任编辑"培训工作

为进一步提高《西安航空技术高等专科学校学报》的编辑质量，强化学报编辑规范和责任意识，从2006年起，本刊根据个人自愿、单位考察及兼顾专业覆盖面的原则，在校内聘任了10名文字功底好，责任心强的同志成为本刊兼职责任编辑。2005年12月30日，本刊编辑部为这些新上任的兼职责任编辑举办了编辑知识的培训。本刊常务副主编、编辑部主任徐行同志为兼职责任编辑们进行了专题辅导讲座。