IP over CCSDS空间组网应用浅析

建立天地一体化的互联网络,实现任意时刻任意两点之间的端到端通信,是空间数据系统发展的必然趋势。CCSDS(空间数据系统咨询委员会)针对空间互联网业务,于2010年4月发布了CCSDS 702.1-R-4,提出了IP over CCSDS最新推荐方法。本文根据CCSDS空间互联网业务空间链路工作组的研究,阐述了在CCSDS空间数据链路协议中承载IP数据报的实现方法、服务及业务接口,并探讨了未来基于IP over CCSDS的空间网络结构。     

基于Web Service的风洞信息数字解决方案

描述了FL-9低速增压风洞信息系统的功能设计、技术设计和方案设计.该系统基于数据库,对风洞资源、试验过程拥有全面而强大的控制能力,是.NET框架的Web Service技术以及工作流技术在国内风洞领域的首次系统应用,是针对航空生产性风洞的通用性数字信息解决方案.     

双组元发动机燃烧室瞬态工作过程仿真

为真实模拟双组元姿控发动机燃烧室的瞬态工作过程,耦合考虑了自燃点火与喷雾燃烧过程,提出了适合于准一维计算的求解燃烧室气体参数的新方法,发展了可反映集液腔填充和排空过程影响的喷注质量子模型,建立了分析双组元姿控发动机燃烧室瞬态工作过程的准一维模型。利用此仿真模型分析了EADS 10N姿控发动机燃烧室的单脉冲和多脉冲工作过程,得到了真空推力、液滴位置分布和总冲等结果,并与文献中的试验结果进行了比较分析。表明仿真结果与试验结果一致性较好。     

中国市场直接运营成本（DOC）计算方法研究与应用

民机运营经济性的分析是民机市场销售成功的关键因素。首先总结了直接使用成本（DOC）模型的研究进展;然后结合中国市场情况,提出一种简单可行的用于民用飞机方案评估的DOC计算模型;接着给出了某典型喷气式客机的计算分析算例,结果表明本文所示的计算方法具有一定的工程指导意义;最后提出进一步研究的主要方向。     

专用IP网端到端QoS保证方案研究

用于航天测控通信的专用IP网实现了话音、图像、数据等多种业务的综合传输。随着流量的增加,网络发生拥塞的可能性也逐渐增大。如何避免拥塞,确保重要数据高实时、高可靠的传输已成为了必须深入研究的课题。本文介绍了IntServ和DiffServ模型,分析了专用IP网的QoS要求,提出了端到端QoS保证方案。最后搭建了实物环境,对方案进行了实验验证,结果表明,使用QoS保证技术后,重要业务数据的实时性和可靠性得到了较好的保证。     

Experimental investigation on operating behaviors of loop heat pipe with thermoelectric cooler under acceleration conditions

An experimental study was carried out in this article to investigate the transient operating performance of a Dual Compensation Chamber Loop Heat Pipe (DCCLHP) with Thermoelectric Cooler (TEC) under acceleration conditions and ammonia was selected as the working fluid. For the purpose of comparison, experimental work was conducted under terrestrial gravity. Sensitivity analysis was performed to explore the effect of several control parameters such as the heat load, acceleration magnitude and TEC assist on the startup and operating performance of the DCCLHP. Experimental results indicate that the DCCLHP can get to a steady-state operation when the heat load changes from 25 W to 300 W under terrestrial gravity. While under acceleration conditions, the DCCLHP can work at a high operating temperature or even fail to operate, which shows the acceleration effect plays a significant impact on the loop operation. The TEC assist with power of 10 W can improve the operating performance and reduce the operating temperature for the case of small heat load and acceleration magnitude. When the acceleration exceeds 3g at large heat load, the effect of TEC assist on the operation at large heat load can be ignored.     

Damage localization effects of the regeneratively-cooled thrust chamber wall in LOX/methane rocket engines

To investigate the damage localization effects of the thrust chamber wall caused by combustions in LOX/methane rocket engines, a fluid-structural coupling computational methodology with a multi-channel model is developed to obtain 3-demensioanl thermal and structural responses. Heat and mechanical loads are calculated by a validated finite volume fluid-thermal coupling numerical method considering non-premixed combustion processes of propellants. The methodology is subsequently performed on an LOX/methane thrust chamber under cyclic operation. Results show that the heat loads of the thrust chamber wall are apparently non-uniform in the circumferential direction. There are noticeable disparities between different cooling channels in terms of temperature and strain distributions at the end of the hot run phase, which in turn leads to different temperature ranges, strain ranges, and residual strains during one cycle. With the work cycle proceeding, the circumferential localization effect of the residual strain would be significantly enhanced. A post-processing damage analysis reveals that the low-cycle fatigue damage accumulated in each cycle is almost unchanged, while the quasi static damage accumulated in a considered cycle declines until stabilized after several cycles. The maximum discrepancy of the predicted lives between different cooling channels is about 30%.     

对某含变频器天线的近场测试

文章提出了两种对含变频器天线的近场测试方法,重点关注了射频系统的连接布局,并简要分析了各方案的可行性、优缺点及应用情况。     

一种新型固体推进剂比冲标准物质

介绍一种新型的比冲标准物质BC-1,同SQ-2标准物质相比,对配方进行了改进,其燃烧性能和燃烧稳定性均优于SQ-2。通过对配方中燃烧催化系统的改进,研制出了一种新型的比冲标准物质BC-1,克服了SQ-2标准物质的燃烧不稳定性,且具有优良的燃烧特性,在6MPa~12 MPa压力范围内的压强指数由0.60降至-0.03。     

基于.NET的有线电视网上收费系统设计方法研究

随着有线电视用户的日益增多,有线电视台的业务量也日益膨胀,建设基于网络的客户服务模式已经成为必然趋势。该文对有线电视网上收费系统实现的关键技术进行了深入的分析,提出了一套基于.NET的分布式多层体系结构解决方案,该方案充分考虑了系统的健壮性、灵活性、可伸缩性,从而实现了系统在物理平台和逻辑平台上的跨越与提高。