V&V在反舰导弹半实物仿真中的应用

半实物仿真在军事领域发挥着重要作用,是研究复杂系统的主要仿真手段.反舰导弹半实物仿真系统的建设目的是为了测试导弹末制导雷达在开环和闭环情况下的抗干扰性能.在对V&V技术的简要介绍的基础上,较详细地介绍了V&V技术在系统建设中的应用.     

可靠性评估方法在运载火箭阀门中的应用

首先论述了阀门可靠性评估的国内外研究现状,然后以减压器为例分析了航天阀门的工作特点,结合其任务剖面,并根据增压输送系统分配的可靠性指标,建立了适于工程应用的可靠性评估模型.     

脉冲星时间尺度的相关研究

在已有脉冲星时频率稳定度σZ算法基础上,提出了针对长时间跨度计时观测数据缺失（gap）的脉冲星时稳定度的处理方法,并以该类典型的脉冲星J1857＋0943于帕克斯天文台PARKES的实测数据为例,给出稳定度计算结果并讨论,简介了计时软件包Tempo2得到最小残差的拟合过程,并以Tempo2处理后的数据作为输入,由其时间尺度结果引发对Tempo2处理脉冲星时间尺度的相关分析与讨论,介绍了含gap的脉冲星观测数据在综合脉冲星时算法中的应用。     

新型SiOC 陶瓷前驱体的合成及性能

采用四甲基四乙烯基环四硅氧烷(TMTVS)与四甲基环四硅氧烷(TMS)通过阳离子开环聚合反应制备了含Si—H及Si—CH=CH2官能团的聚硅氧烷.用红外、核磁、凝胶渗透色谱及热重分析对该聚硅氧烷进行了表征,结果表明其结构与设计相吻合,其分子量、黏度及Si—H、Si—CH=CH2的比例可以通过改变原料比例来调节.这种新型聚硅氧烷用作SiOC陶瓷前驱体具有低黏度、高陶瓷产率等特点.     

POE-g-MAH 对PA66 共混体系性能的影响

讨论了POE-g-MAH含量、MAH接枝率对PA66/POE/POE-g-MAH共混物性能的影响.当POE-g-MAH含量为10wt％～15wt％时,PA66/POE-g-MAH共混物发生脆-韧转变;随POE-g-MAH含量增加,共混物的缺口冲击强度、断裂伸长率显著增大,拉伸强度、弯曲强度、弯曲模量、熔体流动速率、吸水率均明显下降.当POE-g-MAH接枝率为0.05wt％～0.2wt％时,PA66/POE/POE-g-MAH共混物发生脆-韧转变;随POE-g-MAH接枝率增加,共混物的缺口冲击强度、断裂伸长率增大,拉伸强度、弯曲强度、弯曲模量、吸水率变化不大,熔体流动速率下降.SEM照片和Molau实验表明,POE-g-MAH对PA66具有显著的增容增韧效果.     

建立安全的企业网络

以5层网络系统安全体系为基础，就目前的企业网络应用现状，提出了在构建企业安全网络体系中应该考虑的问题和可以采用的具体措施。     

工业工程在民机装配生产管理中的应用

分析了民机装配生产现场管理中存在的问题,提出了工业工程在装配现场管理上的具体应用方法,介绍了装配现场管理中采用的几种可见性图表.     

虚拟环境下的设计质量保证技术

论述了在虚拟环境下的设计质量保证的必要性，综述了虚拟环境下的设计质量保证的关键性技术，提出了在桌面虚拟环境下设计质量保证系统的总体框架。     

A 2-d ionospheric model for low latitude area – Hong Kong

The ionosphere is an important part of the atmosphere and it is the largest error source of GNSS positioning for single-frequency users. So establishing a precise ionosphere model is one of the critical steps for satellite navigation and also for ionospheric research.     

An optimization method for metamorphic mechanisms based on multidisciplinary design optimization

The optimization of metamorphic mechanisms is different from that of the conventional mechanisms for its characteristics of multi-configuration. There exist complex coupled design variables and constraints in its multiple different configuration optimization models. To achieve the compatible optimized results of these coupled design variables, an optimization method for metamorphic mechanisms is developed in the paper based on the principle of multidisciplinary design optimization（MDO）. Firstly, the optimization characteristics of the metamorphic mechanism are summarized distinctly by proposing the classification of design variables and constraints as well as coupling interactions among its different configuration optimization models. Further, collaborative optimization technique which is used in MDO is adopted for achieving the overall optimization performance. The whole optimization process is then proposed by constructing a two-level hierarchical scheme with global optimizer and configuration optimizer loops. The method is demonstrated by optimizing a planar five-bar metamorphic mechanism which has two configurations,and results show that it can achieve coordinated optimization results for the same parameters in different configuration optimization models.