测量设备站点安装对中误差修正方法

靶场大型机动站精密测量设备在站点安装时,通常不能做到设备的回转中心与站点地基环的大地测量中心点重合,这一偏差将影响设备对目标的测量精度,本文提出了一种能有效消除此偏差的方法.建立站点设备安装的回转中心定位公式,利用站点和方位标大地测量结果,经坐标变换重建设备回转中心的站址坐标和方位标数据,修正对中误差引起的设备对目标的测量精度影响.实际使用结果表明,此方法精度高、有效,且易于实施.     

空间太阳能阵列光照的建模仿真及优化

针对空间救援飞行器在无控模式下,固定的太阳能阵列可能受到光线照射面积不足的问题,提出采用建模仿真及优化阵列布局的方法来提高任意光照角度下的受光面积。通过建立参数化驱动的空间飞行器外形几何模型、任意角度下的光线投射模型和考虑自身结构阴影遮挡的光照模型,研究空间任意光照角度下太阳能阵列接收光线照射的有效面积,并得到最低受光面积。基于建立的光照模型,采用遗传算法,对影响太阳能阵列布局的关键参数进行优化。可视化仿真结果校验了模型的有效性,优化结果显示算法收敛且获得了最优结果,满足空间无控飞行任务要求。     

Integrated optimization design of smart morphing wing for accurate shape control

Smart morphing wing, which is equipped with smart materials and able to change structural geometry adaptively, can further improve aerodynamic efficiency of aircraft. This paper presents a new integrated layout and topology optimization design for morphing wing driven by shape memory alloys (SMAs). By simultaneously optimizing the layout of smart actuators and topology of wing substrate, the ultimately determined configuration can achieve smooth, continuous and accurate geometric shape changes. In addition, aerodynamic analysis is carried out to compare smart morphing wing with traditional hinged airfoil. Finally, the optimized smart wing structure is constructed and tested to demonstrate and verify the morphing functionality. Application setbacks are also pointed out for further investigation.     

南极中山站宇宙线观测

2014年由两个具有0.5m×0.5m闪烁体面积的探测器组成的宇宙线μ子望远镜在南极中山站建成,观测数据通过卫星链路传回并发布.通过对中山站μ子望远镜数据的气象效应分析,发现中山站的气压变化对宇宙线计数率影响显著并呈负相关.计算得到宇宙线高能质子在中山站的垂直截止刚度R_C为0.076GV,对比中国西藏羊八井和北京高能质子的垂直截止刚度,中山站非常有利于对太阳高能质子事件的观测.     

Progress Update in Space Cell Mechano-biological Coupling

Recent progresses in 2018-2019 from space experiments onboard SJ-10 recoverable satellite and on parabolic flight were summarized, mainly focusing on cell mechano-biological coupling under microgravity. In the meantime, technical pre-research and experimental system design for the biomechanics research platform on China Space Station was carried out and updated.     

A method in near-surface estimation of air temperature (NEAT) in times following the satellite passing time using MODIS images

Air temperature is one of the most important parameters in environmental, agricultural and water resources studies. This information is not usually always available at the required temporal and spatial resolution. The air temperature is measured at a fixed point in the meteorological stations which are dispersed and may not have the appropriate spatial resolution needed for many applications. On the other hand, MODIS satellite images have relatively acceptable spatial resolution specially for use in environmental studies. There is a methodology with which the near surface air temperature can be extracted from MODIS images at the satellite passing time with an acceptable accuracy. The goal in this study is to find a way to predict the air temperature in times after/before the satellite passing time. The procedure consists of two steps. In the first step, the relationship between the air temperature at a time in a synoptic station and the air temperature in other times up to 5 h later were modeled. In the second step, using these built up relationships, the air temperature extracted from the satellite image at the passing time was extrapolated to the next hours. Finally, the results of this extrapolation method were evaluated using the air temperatures measured at those hours and in the pixels containing some other meteorological stations. The error of the method when applied to a relatively homogeneous surface cover was about 1.5 °C. This error when applied to the next hours, was below 2 °C up to 5 h after satellite passing time. This method can be useful in some agricultural and horticultural applications in which both the spatial and temporal resolution are needed simultaneously. This product is a useful tool for frost prediction, a phenomenon that usually happens at night or early in the morning.     

国际空间站鉴定和验收环境试验要求与GJB 1027A对比及分析

文章介绍了国际空间站组件鉴定环境试验与验收环境试验的主要项目及内容,并且与GJB 1027A—2005组件鉴定环境试验与验收环境试验进行了比较与分析。     

导弹质量矩控制技术发展综述

质量矩技术是近年来导弹控制领域研究的热点问题之一。它是通过调整弹体内部活动质 量块的状态来实现导弹机动飞行的。与传统的气动舵控制方式相比,它具有响应快、气动外 形简单、无舵面烧蚀问题等优点,在大气层内高超声速飞行控制领域具有广阔的应用前景。 简述了质量矩技术的原理及应用领域,回顾了导弹质量矩控制技术的发展历程;从总体 布局、动力学建模、控制系统设计等方面综合分析了质量矩技术的研究现状;提出了一些当 前需要解决的难点问题,供相关人员参考。
     

国外中继卫星对航天器交会对接的测控通信支持

中继卫星系统的天基测控通信是近代航天技术的重大突破,它能够有效地满足航天器交会对接的测控通信需要。文章分析了美国＂跟踪与数据中继卫星系统＂（TDRSS）和欧洲＂阿特米斯＂（ARTEMIS）中继卫星对＂自动转移飞行器＂（ATV）与＂国际空间站＂（ISS）交会对接任务的测控通信支持,总结了国外中继卫星系统支持航天器交会对接...     

复杂分放性测量点优化布置方法研究

随着现代化工业的发展需求日益提升,对于中大型工业部件的加工精度检测也有了更高的要求。对某发动机进行测量检测时,被测物结构较为复杂,测量尺寸较大。由于工作环境特殊,需要尽量避免在非被测物上布设合作标志,而且由于无多余物需求,在待测物表面需要尽量少的布设测量合作标志。因此需要对此需求进行实际研究,对合作标志进行回光性测试,设计了多种复杂分放性测量点布设方式,经试验确定了通过增加测量辅助面的方式可以极大提高测量精度,而且减少一半被测物上测量点布设而不影响测量精度,最后也对测量辅助面与类柱状被测物的布设角度进行相应研究。