多用途战斗机/涡扇发动机一体化循环参数优化

 针对多用途战斗机的特点,发展了基于飞/发一体化的涡扇发动机循环参数优化设计模型和相应的计算程序,优化设计模型中包括双变量控制涡扇发动机特性计算模型、进排气系统安装特性计算模型、飞机气动特性分析模型、重量组成分析模型、任务剖面分析模型、约束分析与任务分析模型和优化计算模型等。重点研究了多用途战斗机约束边界的获得方法,利用多岛遗传算法和自适应模拟退火优化算法,分别对现役多用途战斗机、不加力超声速巡航多用途战斗机以及下一代先进多用途战斗机用涡扇发动机循环参数进行了优化计算,对计算结果进行了分析,获得了对多用途战斗机用涡扇发动机循环参数选择有指导意义的结论。     

密闭容器试验用人体代谢模拟装置

文章简要介绍了人体代谢地面模拟装置的原理、结构组成和应用结果。为在密闭容器中进行地面模拟试验,考核产品性能提供了一个较为可靠而全面的模拟环境。     

Adaptive recognition and correction of baseline shifts from collocated GPS and accelerometer using two phases Kalman filter

The real-time recognition and precise correction of baseline shifts in strong-motion records is a critical issue for GPS and accelerometer combined processing. This paper proposes a method to adaptively recognize and correct baseline shifts in strong-motion records by utilizing GPS measurements using two phases Kalman filter. By defining four kinds of learning statistics and criteria, the time series of estimated baseline shifts can be divided into four time intervals: initialization, static, transient and permanent. During the time interval in which the transient baseline shift is recognized, the dynamic noise of the Kalman filter system and the length of the baseline shifts estimation window are adaptively adjusted to yield a robust integration solution. The validations from an experimental and real datasets show that acceleration baseline shifts can be precisely recognized and corrected, thus, the combined system adaptively adjusted the estimation strategy to get a more robust solution.     

磁暴期间甚低纬哨声的导管传播

对磁暴期间甚低纬哨声导管传播的机理进行了初步的讨论，根据暴时低纬哨声的特点，认为暴时出现的扩展哨、多跳回波是沿东向扰动电场导致的场列电离增强路径传播的。对在东向电场影响下低纬Ｆ层的数值模拟表明，东向电场导致的场列电离增强结构有利于哨声的捕获和传播。     

平台压强指数附加物“TCA”与配方组分粒度和含量的关系

较详细地叙述了平台推进剂压强指数附加物“ＴＣＡ”与推进剂组与的粒度、含量的关系。     

MHD structures, waves and turbulence in the solar wind: Observations and theories

A comprehensive overview is presented of recent observational and theoretical results on solar wind structures and fluctuations and magnetohydrodynamic waves and turbulence, with preference given to phenomena in the inner heliosphere. Emphasis is placed on the progress made in the past decade in the understanding of the nature and origin of especially small-scale, compressible and incompressible fluctuations. Turbulence models to describe the spatial transport and spectral transfer of the fluctuations in the inner heliosphere are discussed, and results from direct numerical simulations are dealt with. Intermittency of solar wind fluctuations and their statistical distributions are briefly investigated. Studies of the heating and acceleration effects of the turbulence on the background wind are critically surveyed. Finally, open questions concerning the origin, nature and evolution of the fluctuations are listed, and possible avenues and perspectives for future research are outlined.     

复合丁羟推进剂压强指数现状评述

本文详细叙述了我国研究压强指数的历史、低压强指数的优点,列举了我国丁羟推进剂压强指数研究的状况,分析比较了国内外水平,指出了今后努力方向.     

碳／环氧复合材料薄壁细长管件的研制与试验

文章简要介绍了碳／环氧复合材料薄壁细长管件的研制情况，着重介绍了工艺方案选定、选材和材料特性试验、成型工艺及解决主要技术难点等内容。制品经地面环模和飞行试验考验，取得了满意效果。     

Emission heights of coronal bright points on Fe XII radiance map

The study of coronal bright points (BPs) is important for understanding coronal heating and the origin of the solar wind. Previous studies indicated that coronal BPs have a highly significant tendency to coincide with magnetic neutral lines in the photosphere. Here we further studied the emission heights of the BPs above the photosphere in the bipolar magnetic loops that are apparently associated with them. As BPs are seen in projection against the disk their true emission heights are unknown. The correlation of the BP locations on the Fe XII radiance map from EIT with the magnetic field features (in particular neutral lines) was investigated in detail. The coronal magnetic field was determined by an extrapolation of the photospheric field (derived from 2-D magnetograms obtained from the Kitt Peak observatory) to different altitudes above the disk. It was found that most BPs sit on or near a photospheric neutral line, but that the emission occurs at a height of about 5 Mm. Some BPs, while being seen in projection, still seem to coincide with neutral lines, although their emission takes place at heights of more than 10 Mm. Such coincidences almost disappear for emissions above 20 Mm. We also projected the upper segments of the 3-D magnetic field lines above different heights, respectively, on to the tangent x–y plane, where x is in the east–west and y in the south–north direction. The shape of each BP was compared with the respective field-line segment nearby. This comparison suggests that most coronal BPs are actually located on the top of their associated magnetic loops. Finally, we calculated for each selected BP region the correlation coefficient between the Fe XII intensity enhancement and the horizontal component of the extrapolated magnetic field vector at the same x–y position in planes of different heights, respectively. We found that for almost all the BP regions we studied the correlation coefficient, with increasing height, increases to a maximal value and then decreases again. The height corresponding to this maximum was defined as the correlation height, which for most bright points was found to range below 20 Mm.     

一座柔壁低湍流度风洞收缩段设计及主要工作特性

本文介绍了一座“柔壁低湍流度风洞”收缩段气动设计中的几个关键问題:合理选用较大的收缩比,恰当选定变湍流度网格位置和采用五次方壁型曲线。试验结果表明,这座雷诺数较大的、具有柔壁功能的低(变)湍流度风洞有优良的流场品质,尤其是湍流度可低达0.01%～0.02%,并具有大范围的变湍流度能力。