基于三维模型定义技术应用的思考

MBD技术是一个新生事物,涉及到系统性问题,它的应用实施是一项长期、复杂而又艰巨的工作。需要考虑的问题不仅涉及技术方面,还有文化、管理、组织和生产方式等方面,只有解决好这些问题,才能充分发挥MBD技术的巨大效力,更好地为我国大飞机研制服务。     

国产着色渗透探伤剂主要性能的普查

本文对国产大部分着色渗透剂、清洗剂、显像剂的主要性能进行了测试，提出了存在的问题，供用户在使用过程中，对探伤剂的性能要求及监督引起重视。     

机载光电稳定平台常用材料的应用

介绍了2种机载光电稳定平台本体常用制造材料,利用有限元的方法对平台本体的强度和变形情况进行了分析.给出了不同材料在平台本体制造中的应用场合.     

Simulation study on slant-to-vertical deviation in two dimensional TEC mapping over the ionosphere equatorial anomaly

With the rapid increase of GPS/GNSS receivers being deployed and operated in China, real-time GPS data from nearly a thousand sites are available at the National Center for Space Weather, China Meteorology Administration. However, it is challenging to generate a high-quality regional total electron content (TEC) map with the traditional two-dimensional (2-D) retrieval scheme because a large horizontal gradient has been reported over east–south Asia due to the northern equatorial ionization anomaly. We developed an Ionosphere Data Assimilation Analysis System (IDAAS), which is described in this study, using an International Reference Ionosphere (IRI) model as the background and applying a Kalman filter for updated observations. The IDAAS can reconstruct a three-dimensional ionosphere with the GPS slant TEC. The inverse slant TEC correlates well with observations both for GPS sites involved in the reconstruction and sites that are not involved. Based on the IDAAS, simulations were performed to investigate the deviation relative to the slant-to-vertical conversion (STV). The results indicate that the relative deviation induced by slant-to-vertical conversion may be significant in certain instances, and the deviation varies from 0% to 40% when the elevation decreases from 90° to 15°, while the relative IDAAS deviation is much smaller and varies from −5% to 15% without an elevation dependence. Compared with ‘true TEC’ map derived from the model, there is large difference in STV TEC map but no obvious discrepancy in IDAAS map. Generally, the IDAAS TEC map is much closer to the “true TEC” than is STV TEC map is.     

信息论视角下的翻译研究

本文主要探讨了描写翻译研究的一种研究方法，即翻译研究的信息论方法。文章概述了信息论方法的概念，并尝试利用信息论的研究成果来解决翻译中的冗余、翻译标准以及机器翻译等问题。     

航空发动机离合器试验台扭矩测控系统的实现

提出了一种由异步电动机实现扭矩加载和控制的新方法，不需扭矩传感器和专门的加载装置实现了扭矩的测量和控制。采用Fuzzy-PID控制算法代替常规PID算法，能较好地模拟离合器的磨合、接合和超越等性能试验。     

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

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

碳纤维涂层结构与性能的关系

 本文用抗氧化数Φ(无量纲)的概念来衡量碳纤维涂层的抗氧化能力。依据化学动力学导出了涂层抗氧化数与涂层结构参数的关系:Φ=KX/D。通过实验,研究了SiO_2及sic涂层结构及碳纤维上涂覆SiO_2及SiC涂层后的热失重及抗拉强度,求得涂层抗氧化数并与计算结果进行了比较。由此分析了涂层结构对抗氧化能力的影响。     

表面涂层-高温合金之间的高温过程研究

采用刷涂和烧结的方法制备了高温合金表面的无机涂层，并对基体进行了预氧化处理。应用俄歇能谱仪（AES）、扫描电镜（SEM）研究了预氧化处理和高温长时间退火条件下，涂层和高温合金之间元素的相互作用。结果表明：氧在合金中的分布曲线服从抛物线法则，高温下基体中铬优先氧化，对高温合金基体进行预氧化处理能有效地阻滞高温条件下基体元素铬的贫化。