移动质心飞行器的参数辨识和补偿控制

受质量块大小和位移的限制,移动质心不能像空气舵那样产生很大的力矩.因此飞行器的再入攻角对静稳定度很敏感,尤其在小静稳定度下,静稳定度稍有改变,配平攻角将发生很大变化.飞行器再入过程中的烧蚀、侵蚀以及边界层转捩所造成的小不对称量所产生的不对称力矩与质心移动后产生的控制力矩相比,不是小量.以所建立的移动质心控制飞行器的数学模型为基础,辨识飞行器静稳定度和小不对称量,对小不对称量造成的气动力矩用前馈一反馈复合控制加以补偿.仿真分析表明,移动质心控制对高速再入的飞行器具有良好的末修能力,能有效提高再入段的控制精度.     

"海洋一号"卫星的检漏技术

文章介绍了"海洋一号"卫星检漏所采用的两种方法,特别指出采用加压真空检漏方法更能真实地测得卫星的实际漏率,并可提高工作效率.     

回流式转轮除湿器热湿交换模型及数值模拟

建立了转轮除湿器的传热、传质数学模型并进行计算机数值模拟.将回流式除湿器与无回流除湿器进行了除湿性能对比.在给定除湿器参数基准条件下,再生气质量流量在0~1.5 kg/(m2·s)范围内增加时,被处理气流出口含湿量下降较明显.此时应用回流对除湿有利.当再生温度小于450 K时,被处理气出口平均含湿量随着再生温度的增加而下降很快;当再生温度大于450 K时则下降很慢.计算结果为除湿器的优化设计提供依据.      

谐振式科里奥利质量流量计

对谐振式科里奥利质量流量计的基本敏感机理进行了论述.基于典型的U型管敏感结构,建立了谐振式直接质量流量计的数学模型,给出了检测质量流量的信号解算模型,设计了一种信号解算电路并研制了相应的样机.实测结果表明:所研制的信号检测电路的测量误差小于0.1％,具有一定的实用价值,为样机研制提供了具有一定参考意义的理论和实验研究结果.     

液氮抽真空制冷的理论及试验

在考虑液氮总质量变化、储罐罐体热容的前提下,基于化学势温差,传热系数和传质系数等参数,详细建立了液氮降压制备过冷液氮的数学模型。理论计算的液氮温度及质量变化和制取过冷液氮试验值吻合较好,结果表明:该数学模型能准确描述液氮相变过程,且获得了液氮抽真空制冷中相变传热的化学势温差为1.21 K、传热系数为2 942.37 W/(m2·K)及传质系数为0.004 4 m/s。      

Solar flares,CMEs and solar energetic particle events during solar cycle 24

We present here a study of Solar Energetic Particle Events (SEPs) associated with solar flares during 2010–2014 in solar cycle 24. We have selected the flare events (≥GOES M-class), which produced SEPs. The SEPs are classified into three categories i.e. weak (proton intensity?≤?1?pfu), minor (1?pfu?<?proton intensity?<?10?pfu) and major (proton intensity?≥?10?pfu). We used the GOES data for the SEP events which have intensity greater than one pfu and SOHO/ERNE data for the SEP event less than one pfu intensity. In addition to the flare and SEP properties, we have also discussed different properties of associated CMEs.     

Dissipative Solitary Kinetic Alfvén Waves and Electron Acceleration in the Solar Corona

Nonthermal electrons play a major role during solar flares since not only they contain a large amount of the released energy but also they provide important information of the flaring physics through their nonthermal radiation in radio and hard X-ray bands. In a recent work Wu (Phys. Plasmas 10 (2003) 1364) proposed that dissipative solitary kinetic Alfvén wave (DSKAW) with a local shock-like structure could provide an efficient acceleration mechanism for energetic electrons in a low-β plasma. In the present paper dynamical characteristics of the DSKAW acceleration mechanism in solar coronal plasmas are studied and its application to the acceleration of flaring electrons is discussed.     

大规模定制设计的产品簇匹配研究

采用基于规则与基于实例相结合的推理方法，给出典型的基于实例推理的专家系统解决问题的一般过程，本文重点研究大规模定制设计的产品簇匹配问题，实施二级匹配策略，先采用规则推理的方法对产品簇大类属性进行匹配，缩小匹配范围，后采用基于实例推理的方法对产品簇小类具体属性进行定量精确匹配，优化了设计手段，效果良好。     

质量矩固体推进微纳卫星自适应反演控制律设计

为解决微纳卫星利用固体火箭推进器进行快速轨道机动时的姿态翻滚问题,提出了利用质量矩技术对卫星的俯仰、偏航通道姿态进行稳定控制。首先考虑推进剂燃烧、质量块运动等因素引起的系统质量特性参数的变化,建立质量矩固体推进微纳卫星姿态动力学模型;然后分析了推进剂燃烧、质量矩控制引入的系统模型参数不确定性、连续有界未知干扰;随后基于反演控制方法,设计了卫星姿态角和姿态角速度双回路自适应滑模动态面控制器,利用自适应算法调节控制参数估计来补偿不确定因素的影响;基于Lyapunov函数证明了闭环系统的稳定性。最后,通过数值仿真验证了控制算法的有效性。     

Interplanetary scintillation observations of the high-latitude solar wind

Until the ULYSSES spacecraft reached the polar regions of the solar wind, the only high-latitude measurements available were from indirect techniques. The most productive observations in regions of the solar wind between 5R and 200R have been the family of radio scattering techniques loosely referred to as Interplanetary Scintillation (IPS) (Coles, 1978). Useful observations can be obtained using a variety of radio sources, for example spacecraft beacons, planetary radar echoes and compact cosmic sources (quasars, active galactic nuclei, pulsars, galactic masers, etc.). However for measurement of the high-latitude solar wind cosmic sources provide the widest coverage and this review will be confined to such observations. IPS observations played a very important role in establishing that polar coronal holes (first observed in soft x-ray emission) were sources of fast solar wind streams which occasionally extend down to the equatorial region and are observed by spacecraft. Here I will review the IPS technique and show the variation of both the velocity and the turbulence level with latitude over the last solar cycle. I will also outline recent work and discuss comparisons that we hope to make between IPS and ULYSSES observations.