基于有向图模型的卫星任务指令生成算法

面向任务的卫星操控模式具有操作简便、星载资源使用效率高的优点,正在取代指令序列注入成为遥感卫星运控的新模式。文章提出一种基于有向图模型的遥感卫星任务指令序列生成算法,具有线性存储复杂度和计算复杂度,适合存储资源和计算资源受限的星载计算机应用。此算法已在某遥感卫星应用,测试试验表明,采用3个面向任务的高级指令即可生成52种指令序列,任务上行注入效率提升了5倍。本文方法根据有效载荷的使用约束条件,配置有向图模型参数,即可满足各种类型卫星使用。     

A survey on life prediction of equipment

Once in the hands of end users, such durable equipment as spacecraft, aircraft, ships,automobiles, computers, etc. are in a state of debugging, working or storage. In either state, availability, reliability and super-efficiency are the ultimate goals, which have been achieved through constant monitoring as well as regular, preventive, routine and corrective maintenance. Although some advanced instruments can visualize certain invisible malfunctioning phenomena into visible ones, deeply hidden troubles cannot be found unless monitoring and testing data are addressed using tools that process the data statistically, analytically and mathematically. Some state-of-theart trouble-shooting and life-predicting techniques and approaches are introduced in this paper.     

Viability of barley seeds after long-term exposure to outer side of international space station

Barley seeds were exposed to outer space for 13 months in a vented metal container without a climate control system to assess the risk of physiological and genetic mutation during long-term storage in space. The space-stored seeds (S0 generation), with an 82% germination rate in 50 seeds, lost about 20% of their weight after the exposure. The germinated seeds showed normal growth, heading, and ripening. The harvested seeds (S1 generation) also germinated and reproduced (S2 generation) as did the ground-stored seeds. The culm length, ear length, number of seed, grain weight, and fertility of the plants from the space-stored seeds were not significantly different from those of the ground-stored seeds in each of the S0 and S1 generation. Furthermore, the S1 and S2 space-stored seeds respectively showed similar β-glucan content to those of the ground-stored seeds. Amplified fragment length polymorphism analysis with 16 primer combinations showed no specific fragment that appears or disappears significantly in the DNA isolated from the barley grown from the space-stored seeds. Though these data are derived from nine S0 space-stored seeds in a single exposure experiment, the results demonstrate the preservation of barley seeds in outer space for 13 months without phenotypic or genotypic changes and with healthy and vigorous growth in space.     

固体火箭发动机装药寿命预示方法试验研究

研究了固体火箭发动机装药硬度和ＨＴＰＢ推进剂方坯硬度、强度及延伸率在贮试期内的变化规律，建立了装药硬度－强度、延伸率－贮存期相关联的数学模型和回归方程组。用其预估固体发动机装药寿命。     

一种高可靠长寿命的推进系统

介绍单元肼为推进剂的卫星推进系统，该系统已成功用于我国地球同步轨道通信卫星，高可靠，长寿命。叙述了系统及各部件的主要性能，关键部件的特性与可靠性试验，材料相容性试验，微粒控制及系统热试车。根据多年的飞行试验及地验对系统进行了可靠性计算。     

机身壁板裂纹容限分析的工程方法在某运输机上的应用

 In this paper, the stress strength factor of fuselage stiffened panels of transport airplanes has been obtained by using two-dimensional, analytical solution, curvature correc tion and nonuniform stress correction. Based on the Kc criterion critical crack length has been obtained. By using the fast integral technic the residual strength and residual life under random spectra for skin circumferential crack at the typical broken stringer and for longitudinal crack at the typical broken frame were obtained and analysed. Then by analyzing the above numerical results, the basic information for determining the life of the transport airplane has been provided. The above calculation is conducted on a IBM236 microcomputer.Due to the use of analytical and fast integral approaches the method used in this paper is convenient and economic.It can be used for crack tolerance analysis of other airplane structures.     

DISTRIBUTION MODEL OF FATIGUE LIFEAND ITS GOODNESS-OF-FIT TEST

ＤＩＳＴＲＩＢＵＴＩＯＮＭＯＤＥＬＯＦＦＡＴＩＧＵＥＬＩＦＥＡＮＤＩＴＳＧＯＯＤＮＥＳＳ－ＯＦ－ＦＩＴＴＥＳＴＤｏｎｇＣｏｎｇ；ＲｏｎｇＨａｉｗｕ；ＸｉａＲｅｎｗｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＡｉｒｃｒａｆｔＥｎｇｉｎｅｅｒｉｎｇ，ＢｅｉｊｉｎｇＵｎ...     

激光辐照对钢试样疲劳寿命的影响

 讨论了棒形钢试样的疲劳寿命与激光辐照参量、硬度、层深间的关系。     

涡轮叶片疲劳寿命公式及可靠性预测方法

本文推导了液体火箭发动机涡轮叶片疲劳寿命公式,并用概率统计、断裂力学方法,分析了可靠性预测方法.     

改进残存比率法

1.问题的提出 从使用过程得到的故障统计资料常有信息丢失现象,用这种样本进行产品可靠性分析时,残存比率法是有效的工具,并已在实践中得到广泛应用。然而,用文献介绍的公式计算的残存比率和可靠度与真值有较大出入,当删除样品数较大时偏差尤其明显。本文的目的是力图找到发生这种偏差的原因和纠正偏差的方法,使残存比率法更加完善。