Assessment of Reliability Indicators of Space Vehicles under Conditions of Incomplete Data

Cosmic Research - We consider the problem of assessing the reliability indicators of spacecraft described by the “load–strength” model under conditions of incomplete data...     

Mathematical Modeling of Convection in the DACON Sensor under Conditions of Real Space Flight

A mathematical model of the operation of the sensor of convection under ground and space conditions is described, and the results of modeling are compared to experimental data. A good agreement of the model and experiment is obtained for ground conditions. The sensor operation under conditions of a space flight is simulated using actual microaccelerations that took place onboard the Mirstation. Good sensitivity of the sensor to the measured components of acceleration is demonstrated. The results of simulation are compared to the results of space experiments carried out with the DACON instrument onboard the Mirstation.     

空间环境对聚合物基复合材料性能的影响

文章介绍了空间飞行器工作过程中的空间环境条件。为满足这些要求 ,在设计与选材时须考虑一些因素。此外对某型号任务中使用的P75S/环氧648复合材料耐空间环境条件的性能做了简要评述。     

空间环境对聚合物基复合材料性能的影响分析

文章介绍了空间飞行器工作过程中的空间环境条件。为满足这些要求 ,在设计与选材时须考虑一些因素。此外对某型号任务中使用的P75S/环氧 6 48复合材料耐空间环境条件的性能做了简要评述     

Results and Prospects of Studying the Gravitationally Sensitive Systems of Plants under Conditions of Space Flight

Based on systematic studies of the impact of space flight factors on higher plants, carried out for many years both aboard orbital research stations and in the ground laboratories, we have formulated the means of solving the problem of the interaction of mankind with the plant life. The principal feasibility of the growth and development of higher plants (arabidopsis, peas, and wheat) under conditions of space flight is established, including the generative stage (arabidopsis). It is proved that the factors of space flight destabilize the macro- and microstructures of higher plants and their cellular organelles, which is an unambiguous response of cells to the changing conditions of their existence.     

近地空间飞艇发展现状与趋势

近地空间飞艇今天不但在军事上得到了应用,就是在民用中也得到各领域的关注。因此,近年来各国竟相发展,使得飞艇在军事上成为近地空间的首选装备。文章针对国外飞艇发展现状与发展趋势进行论述,旨在阐述飞艇在未来军事领域中的应用与地位。     

Three Major Tasks of The Tiangong 2 Space Laboratory

正Since the successful launch on September 15,the Tiangong2 space laboratory mission commenced,5 years after the successful operation of the Tiangong 1 target spacecraft.Tiangong2 is the first spacecraft that was launched into space as part of phase two of the second step of China’s manned space program.It is the first real space laboratory for the country.Compared with Tiangong 1,Tiangong 2 will conduct more     

航天工程技术保障投资的分配模型研究

研究了航天工程技术保障投资分配决策的影响因素，建立了技术保障投资分配的总体模型和投资比例分配模型，确立了技术保障项目投资预算额、投资分配比例以及技术保障投资总额之间的关系；依据各影响因素的权重和专家们的经验判断，计算出了每个技术保障投资项目的综合得分，并以此为基础确定了投资分配的比例值，从而使得投资分配过程得以量化，而且科学、合理。     

Convective Motions in Near-Critical Fluids under Real Zero-Gravity Conditions

The results of processing and interpreting the data of joint Russian–French experiments for studying the heat and mass transfer in near-critical fluids are presented. The experiments were carried out with the ALICE-1 instrument during an orbital flight of the Mirstation from September 30 to October 2, 1995 [1]. For such fluids with a point-like source of heat, when they are placed in the field of uncontrolled inertial accelerations of the spacecraft, the influence of thermovibrational and thermogravitational mechanisms of convection on the propagation of the region of optical irregularity is investigated. It is shown that, near the thermodynamic critical point, local heating of the medium leads to generation of either intense thermogravitational convection or averaged vibroconvective flow, depending on the frequency of variations of the microaccelerations. The structure and characteristics of discovered motions are studied. The results of numerical simulations are presented that confirm the conclusion about a possibility of generation of an averaged convective flow of a vibrational type by the high-frequency component of microaccelerations.     

约束条件下垂直着月窗口设计

用双二体模型和最新的星历表数据,给出了奔月过程中的光照、测控和轨道运动学等约束条件下月球探测器通过停泊轨道中转垂直着月的窗口,以及停泊轨道和地月转移轨道的运动学参数的确定方法,并进行了仿真计算。分析表明,该方法可快速计算探测器发射窗口,为精确轨道设计的搜索提供初始条件。     

一种干扰环境下的机载SAR慢动目标检测方法

在电磁干扰的环境下,经典的合成孔径雷达(SAR)的成像和地面动日标检测算法的性能将会变差甚至失效,因此研究存在干扰时的高效可行的SAR动目标检测方法具有重要的实际意义.提出一种将自适应波束形成技术和杂波抑制干涉(CSI)技术相结合的阵列天线动目标检测方法.该方法首先采用自适应波束形成技术消除干扰,然后用CSI方法抑制地杂波并实现运动目标的检测.同时,采用不等间距偏置相位中心天线(DPCA)技术,消除了盲速区.从SAR天线结构和空间几何模型人手,详细分析了干扰抑制原理、杂波抑制和动目标检测原理并给出了其实现框图.最后通过计算机仿真,验证了该方法的可行性.     

透镜式薄壁CFRP管空间伸展臂轴压屈曲分析及试验

对透镜式截面四层铺设薄壁碳纤维增强塑料(CFRP)管空间伸展臂进行轴压载荷试验,得到轴压临界屈曲载荷及屈曲特性。利用有限元模型进行线性特征值屈曲分析,并引入屈曲模态形式作为初始几何缺陷进行非线性屈曲分析,得到轴压下屈曲临界载荷及非线性屈曲特性,并与试验结果进行对比分析。结果表明初始几何缺陷对CFRP管轴压临界载荷影响较大,给CFRP管加入适当的几何缺陷可更有效模拟实际非完善体的屈曲载荷。进而对其材料厚度、层数和铺设角度进行参数分析,得到各参数对轴压临界载荷的影响程度及敏感性,本文对透镜式薄壁CFRP管空间伸展臂的设计和深入研究具有重要参考价值。     

Transport Characteristics of Macroparticles in Dusty Plasma Induced by Solar Radiation under Microgravity Conditions

The transport characteristics of macroparticles, charged by the solar radiation under microgravity conditions, were investigated by analyzing the videorecords of experiments carried out onboard the Mirorbital station. The temperature, distributions of velocities, charge, friction coefficient, and diffusion coefficient were obtained for bronze particles.     

空间微重力环境下主动隔振系统的三维位置测量

为保障实验载荷的微重力水平不被破坏,需要对载荷进行位置测量以便在较长的时间里控制浮子运动行程免于碰撞定子内壁。本文在介绍二维位置敏感探测器(PSD)工作原理的基础上,提出了用三个二维PSD进行三维位置测量的方法并推导了解算三维位置的数学模型,文中还对国产W204型PSD的非线性误差进行了双一次插值处理,提高了PSD自身的测量精度,最后仿真分析了位置安装误差对三维位置解算精度的影响,对三维位置测量设计具有指导意义。     

Radiative Electrification of Spacecraft Construction Elements: Physical Modeling of Charge Accumulation and Neutralization

The basic principles of physical modeling of spacecraft radiative electrification in the ionosphere and the magnetosphere are formulated. It is shown that recorded cyclograms and current pulses of discharges provide complete information on the electrophysical properties of materials. The efficiency of plasma neutralization of electro-radiative effects depends on the density of low temperature plasma and the structure of the irradiated surface.     

空间站空间因特网与空间通信链路设计

为改善在空间站长期值守的航天员的业务生活,提出建立空间站网吧,为航天员提供因特网服务的构想。为此分析研究空间站空间因特网服务系统及其关键技术,提出空间站空间因特网服务系统构建方案。结合这一系统构建方案,一是研究解决了支持复杂异构网络运行的空间因特网网络协议设计技术,空间站空间因特网直接采用TCP/IP协议,并通过系统设计,较好地克服了TCP/IP协议不能适应空间通信链路的难题,支持采用基于TCP/IP协议的商用货架(COTS)软、硬件产品,可明显降低空间站空间因特网服务系统建设与维护成本;二是研究解决了涉及空间站测控通信网运行安全和空间信息安全的空间通信链路设计技术,空间站在同一条空间通信链路同时传输空间因特网数据和空间站测控通信数据,空间通信链路采用CCSDS的AOS协议,并通过建立虚拟的物理信道,解决了空间因特网数据和空间站测控通信数据的安全隔离问题,能满足空间站测控通信网运行安全和空间信息安全的要求。     

微重力充液系统大幅晃动动力学及其在航天高技术中的应用

本文首先论述了在微重力环境下充液系统大幅晃动动力学的理论基础，其次阐明了它在充液航天器动力学与控制中的应用，最后分析了液体大幅晃动自由边界的确定以及数值稳定性等问题。     

从发现号航天飞机的安全谈空间碎片的危害

2005年8月9日，发现号航天飞机在执行完14天的太空飞行任务后，安全返回美国爱德华兹空军基地。此次飞行是哥伦比亚号航天飞机失事后的首次飞行。虽然在此前两年半的时间里美国航宇局（NASA）耗资30多亿美元，在六个方面改善了航天飞机的性能，但整个过程并不顺利，可谓一波三折，引起了全世界的广泛关注。让美国人引以自豪的航天飞机日显老态，逐渐暴露出诸多问题，这对美国今后的航天事业也将产生深远的影响。