大型弹道式飞行器六自由度仿真研究与展望

本文针对大型弹道式飞行器传统建模和仿真方法的局限性，采用多种运动形态一体化建模方法，建立了飞行器全干扰，全量，全通道，时变非线性六自由度模型，并进行了数字仿真和接入部分实装的半实物仿真。     

天基空间目标监视可见光遥感器研究

文章通过对美国天基可见光遥感器SBV性能和关键技术的分析，提出了发展中国天基空间目标监视可见光遥感器的建议。     

计算机辅助导弹部位安排系统研究

本文介绍了一种计算机辅助导弹部位安排系统。它利用计算机实体造型技术,实现了导弹部位安排。系统利用多面体求交法进行干涉检查;应用两多面体之间点、线、面的分层计算法计算部件间的最小间隙;采用改进的三棱锥分割法计算部件的质量特性。系统具有人机交互功能,并可在绘图机上绘制二维部位安排图。本文以某型导弹的仓段部位安排作为实例,对该系统的正确性作了验证。     

软件测试过程的基本模型POCERM

软件测试过程包含着测试计划的制定，测试大纲的编制，测试用例的生成，测试的实施，测试结果与问题的分析和报告，以及软件测试的管理等项工作。     

面向可重构制造系统的设备建模

可重构制造系统的建模是分析和控制可重构制造系统的关键技术，而可重构制造系统中的设备建模是可重构制造系统建模的基础。本文提出面向可重构制造系统的设备的赋时面向对象Petri网模型，并通过实例研究证实了其正确性。面向可重构制造系统的设备的赋时面向对象Petri网模型能够表示可重构制造系统重构前后设备的作业安排的变化情况．因此它是可重构制造系统中设备的正确的形式化表示。     

A unifying approach in simulating the shot peening process using a 3D random representative volume finite element model

Using a modified 3D random representative volume (RV) finite element model,the effects of model dimensions (impact region and interval between impact and representative regions),model shapes (rectangular,square,and circular),and peening-induced thermal softening on resultant critical quantities (residual stress,Almen intensity,coverage,and arc height) after shot peening are systematically examined.A new quantity,i.e.,the interval between impact and representative regions,is introduced and its optimal value is first determined to eliminate any boundary effect on shot peening results.Then,model dimensions are respectively assessed for all model shapes to reflect the actual shot peening process,based on which shape-independent critical shot peening quantities are obtained.Further,it is found that thermal softening of the target material due to shot peening leads to variances of the surface residual stress and arc height,demonstrating the necessity of considering the thermal effect in a constitutive material model of shot peeing.Our study clarifies some of the finite element modeling aspects and lays the ground for accurate modeling of the SP process.     

An update global model of hmF2 from values estimated from ionosonde and COSMIC/FORMOSAT-3 radio occultation

In this paper, we present our recent work on developing an updated global model of the ionospheric F2 peak height hmF2 parameter by combining data from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC/FORMOSAT-3) radio occultation (RO) measurements and from the extended global ionosonde stations. In particular, 10 Chinese ionosonde stations’ data are newly introduced into this study. The modeling technique used is based on a two-layer empirical orthogonal function (EOF) expansion. Global distributions of hmF2 maps calculated using the newly constructed global model and the one provided by the International Reference Ionosphere model (IRI-ITU-R) are compared with the global distributions of hmF2 obtained by the COSMIC RO measurements and quantitative statistical analysis of the differences between the model results and those of the COSMIC RO measurements is made for the low (2008) and high (2012) solar activity years. The obtained average root-mean-square differences (RMSEs) for our model are 27.7 km (11.1%) and 31.0 km (9.8%), respectively for the years 2008 and 2012, whereas those for the IRI-ITU-R model are 39.9 km (16.9%) and 35.0 km (11.6%), respectively. Comparison of the results calculated both by our model and the IRI-ITU-R model with the digisonde observation is also made. The comparisons show that the newly constructed global hmF2 model can reproduce reasonably well the observations and perform better than IRI-ITU-R model.     

北京空间机电研究所50年成就与展望

文章介绍了北京空间机电研究所50年来在回收与着陆技术、航天光学遥感技术和复合材料成型技术领域所取得的成就,并对三大技术领域的后续发展进行了展望.     

埋头焊接方法及其应力变化

针对普通焊接方式形成焊点的多种缺点,提出了针对通孔插装元器件的埋头焊接概念及各种实现方案,并对各种焊接方案进行分析对比。最后通过有限元分析软件对一种相对较优方案进行了应力变化分析,为埋头焊接的具体应用提供了实现方式参考和理论数据支持。     

Evaluation of global modeling of M(3000)F2 and hmF2 based on alternative empirical orthogonal function expansions

Global modeling of M(3000)F2 and hmF2 based on three alternative EOF (empirical orthogonal function) expansion methods is described briefly. Data used for the model construction is the monthly median hourly values of M(3000)F2 from the ionosonde/digisonde stations distributed around the world for the period of 1975–1985 and the hmF2 data of the same period converted from the measured M(3000)F2 based on the strong anti-correlation existing between them. Independent data of a low (1965) and a high (1970) solar activity year are used to validate the three alternative models based on different EOF expansion methods. Comparisons between the modeled results and observed data for both the low (1965) and high (1970) solar activity years showed good agreement for both M(3000)F2 and hmF2 parameters. Statistical analysis on the differences between model values and observed data showed that all the three alternative models (Model A, B and C) based on the different EOF expansion methods have better agreement with the observed data than the models currently used in IRI. All three alternative EOF based models have almost the same accuracy. Discussion on the preference of the three alternative EOF based models is given.