中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共8条，第1-8条

帮助

条数/页：排序方式：
	Progress in the study of typical planetary landforms over the past 30 years: a bibliometric analysis in CiteSpace 期刊论文 OAI收割 FRONTIERS IN ASTRONOMY AND SPACE SCIENCES, 2025, 卷号: 12, 页码: 1485785 作者: Zhang, Yutong; Cheng, Weiming \| 收藏 \| 浏览/下载：14/0 \| 提交时间：2025/04/21 planetary landform remote sensing bibliometric analysis mission solar system
	The Earth 2.0 space mission analysis and spacecraft design 会议论文 OAI收割 Montreal, CANADA, 2022-07-17 作者: Chen Wen; Chen Kun; Yang Yingquan; Han Xingbo; Bi Xingzi \| 收藏 \| 浏览/下载：63/0 \| 提交时间：2022/11/21 Earth 2.0 mission analysis spacecraft design high stability high photometry precision
	Analysis of fusion propulsion system for Earth-to-Mars mission 期刊论文 OAI收割 FUSION ENGINEERING AND DESIGN, 2021, 卷号: 164 作者: Song, Jun; Chen, Zhibin; Zeng, Qiusun; Bai, Yunqing; Wang, Fang \| 收藏 \| 浏览/下载：26/0 \| 提交时间：2021/05/06 Fusion propulsion system Requirement analysis Earth-to-Mars mission
	Development of a novel end-effector for an on-orbit robotic refueling mission 期刊论文 OAI收割 IEEE Access, 2020, 卷号: 8, 页码: 17762-17778 作者: Liu JG(刘金国); Tong YC(佟玉闯); Liu YJ(刘云军); Liu YW(刘玉旺) \| 收藏 \| 浏览/下载：37/0 \| 提交时间：2020/03/08 On-orbit servicing robotic refueling mission end-effector imitating human hand collision dynamics analysis
	Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文 OAI收割 2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China 作者: Zhang L.; Zhang L. 收藏 \| 浏览/下载：64/0 \| 提交时间：2013/03/25 The coaxial two-mirror telescope consists of two mirrors facing each other. Classical two-mirror arrangements are Gregorian and Cassegrain. These systems are usually applied to space telescopes and often have optical baffles to prevent stray light from entering the focal plane. The optical baffles consist of concentric rings suspended between the secondary and the primary mirror. The secondary baffle for a large two-mirror optical system is designed and analyzed in this paper. According to mission of a telescope the structure should have high stiffness and high reliability and light weight. Compared with invar aluminum alloy and titanium alloy carbon fiber composite is currently the best material in terms of weight-to-strength ratio. It also has advantages of high temperature tolerance and low thermal expansion. So carbon fiber composite is chosen as material to meet requirements of the coaxial telescope. In this paper optimization method based on finite element analysis (FEA) is used for design the secondary baffle. Minimum weight of the baffle is chosen as an objective function. Thicknesses of former tube and vanes are chosen as variables. Analysis results show that the designed secondary baffle has maximum diameter of 180mm total length of 120mm and weighs 142g. And its fundamental frequency reaches 651Hz. Therefore the baffle has many advantages such as ultra-light weight high stiffness and dimensional stability etc. The optimization method and the baffle design can be helpful to other coaxial telescopes such as Cassegrain Gregorian and their subdivisions. 2012 IEEE.
	Design of motion adjusting system for space camera based on ultrasonic motor (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China 作者: Sun Z. 收藏 \| 浏览/下载：86/0 \| 提交时间：2013/03/25 Drift angle is a transverse intersection angle of vector of image motion of the space camera. Adjusting the angle could reduce the influence on image quality. Ultrasonic motor (USM) is a new type of actuator using ultrasonic wave stimulated by piezoelectric ceramics. They have many advantages in comparison with conventional electromagnetic motors. In this paper some improvement was designed for control system of drift adjusting mechanism. Based on ultrasonic motor T-60 was designed the drift adjusting system which is composed of the drift adjusting mechanical frame the ultrasonic motor the driver of Ultrasonic Motor the photoelectric encoder and the drift adjusting controller. The TMS320F28335 DSP was adopted as the calculation and control processor photoelectric encoder was used as sensor of position closed loop system and the voltage driving circuit designed as generator of ultrasonic wave. It was built the mathematic model of drive circuit of the ultrasonic motor T-60 using matlab modules. In order to verify the validity of the drift adjusting system was introduced the source of the disturbance and made simulation analysis. It designed the control systems of motor drive for drift adjusting system with the improved PID control. The drift angle adjusting system has such advantages as the small space simple configuration high position control precision fine repeatability self locking property and low powers. It showed that the system could accomplish the mission of drift angle adjusting excellent. 2011 SPIE.
	Error Analysis of DEM Derived from Airborne Single-pass Interferometric SAR Data 会议论文 OAI收割 2011 Ieee International Geoscience and Remote Sensing Symposium, New York Sun Zhongchang; Guo Huadong; Li Xinwu; Jiao Mengmei 收藏 \| 浏览/下载：19/0 \| 提交时间：2014/12/07 airborne interferometric SAR digital elevation model error analysis RADAR INTERFEROMETRY MISSION
	Resolution performance of extreme ultraviolet telescope (EI CONFERENCE) 会议论文 OAI收割 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, November 19, 2008 - November 21, 2008, Chengdu, China 作者: Yang L.; Chen B.; Chen B.; Liang J.-Q.; Ni Q.-L. 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/03/25 Extreme Ultraviolet Telescope (EUT) will image solar corona in four EUV narrow bandpasses defined by multilayered coatings deposited on normal incidence optics. In order to make sure it will get sub-arcsecond angular resolution in the mission we have to test its resolution performance on ground. The EUT is aligned by Zygo interferometer first and a global wavefront error of 0.152 peak to valley is obtained ( = 632.8nm ). Because of the difficulty of angular resolution test for EUT at its operating wavelengths we test its optical performance at visible and UV band. The method is to place the resolution test-target on the focal plane of collimator and illuminate the target by visible and UV light espectively then the collimated light will go through EUT and image at focal plane on CCD. By analysis of the images obtained in experiments we conclude that the angular resolution of EUT is 1.22 at visible light ( = 570nm ) which is very close to diffraction limit (1.20) and according to these results we estimate that the operational wavelength resolution is better than 0.32 meets design requirements. While for UV light the angular resolution is 1.53 that is different from diffraction limit (0.53) the error comes mainly from large pixel of EUV camera. 2009 SPIE.