中国空间科学技术最新文献_第3页

Experimental and Simulation Study on Shielding Performance of Developed Hydrogenous Composites 研制的含氢复合材料屏蔽性能的实验与仿真研究

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2022-01-27 DOI: 10.34133/2022/9754387

Minghui Cai, Tao Yang, Hongwei Li, Haixia Yang, Jia Han

引用次数: 4

Progress and Development Trend of Space Intelligent Robot Technology 空间智能机器人技术的进展与发展趋势

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2022-01-25 DOI: 10.34133/2022/9832053

Zhihong Jiang, Xiaolei Cao, Xiao-Xi Huang, Hui Li, M. Ceccarelli

引用次数: 16

Corrigendum to “Thermal Environment and Aeroheating Mechanism of Protuberances on Mars Entry Capsule” “火星太空舱上凸起物的热环境和气动加热机理”的勘误表

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2022-01-20 DOI: 10.34133/2022/9790353

Wenbo Miao, Qi Li, Junhong Li, J. Zhou, Xiaoli Cheng

引用次数: 0

Autonomous Assembly Method of 3-Arm Robot to Fix the Multipin and Hole Load Plate on a Space Station 空间站多销孔载荷板三臂机器人的自主装配方法

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2021-12-16 DOI: 10.34133/2021/9815389

Zeyuan Sun, Hong Yang, Que Dong, Yang Mo, Hui Li, Zhihong Jiang

{"title":"Autonomous Assembly Method of 3-Arm Robot to Fix the Multipin and Hole Load Plate on a Space Station","authors":"Zeyuan Sun, Hong Yang, Que Dong, Yang Mo, Hui Li, Zhihong Jiang","doi":"10.34133/2021/9815389","DOIUrl":"https://doi.org/10.34133/2021/9815389","url":null,"abstract":"Using space stations for a large number of observation, exploration, and research is a necessary way to fully develop space technology. It is a necessary means of space experiment to install the extravehicular experimental load by using the load plate. However, the extravehicular environment is full of danger, which poses a threat to the health and even safety of astronauts. Using robots to replace astronauts to complete this task can effectively reduce the threat to astronauts. Aiming at the problem that the configurations of existing space robots have difficulty in balancing the contradiction between complexity and dexterity, our previous work proposes a 12-DOF 3-arm robot and preliminarily explores the feasibility of its large-scale ability. This paper focus on the 8-DOF redundant dexterous manipulator composed of 2 of the robot arms. In view of the difficulties in solving the inverse kinematics of the redundant manipulator, the challenges of complex environmental lighting, and difficulties of matching multiple groups of holes and pins in the load plate assembly task, the research on the autonomous assembly of the load plate is carried out. The main work is as follows: (a) A variable D-H parameter inverse kinematics solution method is proposed, which lays a foundation for humanoid dexterous operation planning of the robot. (b) An autonomous operation method based on visual guidance and variable parameter admittance control is proposed. Finally, the safety and robustness of the robot in the autonomous assembly of the load plate with multipins and holes are successfully verified by experiments.","PeriodicalId":44234,"journal":{"name":"中国空间科学技术","volume":"43 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77999047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Thermal Environment and Aeroheating Mechanism of Protuberances on Mars Entry Capsule 火星返回舱上凸起物的热环境与气动加热机理

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2021-11-20 DOI: 10.34133/2021/9754068

Mi Wenbo, Li Qi, Liang Junhong, Zhou Jingyun, Cheng Xiaoli

{"title":"Thermal Environment and Aeroheating Mechanism of Protuberances on Mars Entry Capsule","authors":"Mi Wenbo, Li Qi, Liang Junhong, Zhou Jingyun, Cheng Xiaoli","doi":"10.34133/2021/9754068","DOIUrl":"https://doi.org/10.34133/2021/9754068","url":null,"abstract":"Mars has only thin atmosphere composed mainly of carbon dioxide that differs significantly from the atmosphere of Earth in terms of characteristics of reentry flows. To connect with the orbiter, the Mars entry capsule is provided with titanium pipes and other units installed on the heat-shield. These units will create significant local interaction flow on the surface of the capsule and cause additional heating on the surface of the shield during the entry of the capsule. With a view to interaction thermal environment issues for the surface of the shield, in this paper, the characteristics of protrusion interaction flow on different location of the shield were studied by means of numerical simulation. Heating mechanisms of protuberances on different location were derived by analyzing characteristic parameters such as local flow velocity, pressure, and Mach number. The results show that the interaction thermal environment of protuberances in the windward area is smaller than that of protuberances in the leeward area, mainly because subsonic flow dominates in the windward area, and the interaction is weak, while in the leeward area, the direction of flow intersects with protuberances to form a boundary layer shear flow, which results in a stronger interaction before the protuberances.","PeriodicalId":44234,"journal":{"name":"中国空间科学技术","volume":"17 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90707145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Orbit Design Elements of Chang’e 5 Mission 嫦娥五号轨道设计要素

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2021-11-16 DOI: 10.34133/2021/9897105

Zhong-Sheng Wang, Zhanfeng Meng, Shan Gao, Jing Peng

引用次数: 5

Developing Prototype Simulants for Surface Materials and Morphology of Near Earth Asteroid 2016 HO3 近地小行星2016 HO3表面材料和形貌的原型模拟研究

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2021-11-08 DOI: 10.34133/2021/9874929

Xiaojing Zhang, Y. Luo, Yuan Xiao, Deyun Liu, Fan Guo, Qian Guo

引用次数: 5

Decentralized Distributed Deep Learning with Low-Bandwidth Consumption for Smart Constellations 面向智能星座的低带宽分布式深度学习

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2021-10-31 DOI: 10.34133/2021/9879246

Qingliang Meng, Meiyu Huang, Yao Xu, Naijin Liu, Xueshuang Xiang

{"title":"Decentralized Distributed Deep Learning with Low-Bandwidth Consumption for Smart Constellations","authors":"Qingliang Meng, Meiyu Huang, Yao Xu, Naijin Liu, Xueshuang Xiang","doi":"10.34133/2021/9879246","DOIUrl":"https://doi.org/10.34133/2021/9879246","url":null,"abstract":"For the space-based remote sensing system, onboard intelligent processing based on deep learning has become an inevitable trend. To adapt to the dynamic changes of the observation scenes, there is an urgent need to perform distributed deep learning onboard to fully utilize the plentiful real-time sensing data of multiple satellites from a smart constellation. However, the network bandwidth of the smart constellation is very limited. Therefore, it is of great significance to carry out distributed training research in a low-bandwidth environment. This paper proposes a Randomized Decentralized Parallel Stochastic Gradient Descent (RD-PSGD) method for distributed training in a low-bandwidth network. To reduce the communication cost, each node in RD-PSGD just randomly transfers part of the information of the local intelligent model to its neighborhood. We further speed up the algorithm by optimizing the programming of random index generation and parameter extraction. For the first time, we theoretically analyze the convergence property of the proposed RD-PSGD and validate the advantage of this method by simulation experiments on various distributed training tasks for image classification on different benchmark datasets and deep learning network architectures. The results show that RD-PSGD can effectively save the time and bandwidth cost of distributed training and reduce the complexity of parameter selection compared with the TopK-based method. The method proposed in this paper provides a new perspective for the study of onboard intelligent processing, especially for online learning on a smart satellite constellation.","PeriodicalId":44234,"journal":{"name":"中国空间科学技术","volume":"18 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78664868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Performance Evaluation Indicators of Space Dynamic Networks under Broadcast Mechanism 广播机制下空间动态网络性能评价指标

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2021-10-29 DOI: 10.34133/2021/9826517

Zipeng Ye, Qingrui Zhou

{"title":"Performance Evaluation Indicators of Space Dynamic Networks under Broadcast Mechanism","authors":"Zipeng Ye, Qingrui Zhou","doi":"10.34133/2021/9826517","DOIUrl":"https://doi.org/10.34133/2021/9826517","url":null,"abstract":"Large-scale heterogeneous constellations will be the major forms of future space-based systems, and the implementation of numerous derived applications depends mainly on intersatellite communication. The nodes representing heterogeneous satellites will form the networks with rapidly changing topology. However, few researches have been carried out for such networks. This paper studies the broadcast mechanism for space dynamic networks and establishes centralized and distributed routing framework. And then, performance evaluation indicators are proposed to evaluate both the connectivity of dynamic networks and the effectiveness of routing algorithms. Finally, we examine the performance of multigroup networks and verify the rationality of corresponding indicators. We also explore the impact of information survival time which directly affects the delivery ratio and, if unfortunately, may waste the communication resources. Empirical conclusion about the survival time is given in the final part. We believe the performance indicators and the routing algorithms proposed in this paper are great help to future space-based system and both the broadcast mechanism designing.","PeriodicalId":44234,"journal":{"name":"中国空间科学技术","volume":"21 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75625117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A New Recursive Composite Adaptive Controller for Robot Manipulators 一种新的递归复合自适应机器人操纵器控制器

IF 0.9 4区工程技术

中国空间科学技术 Pub Date : 2021-10-27 DOI: 10.34133/2021/9801421

Jianfei Li, Yaobing Wang, Zhiyong Liu, Xin Jing, Chengwei Hu

引用次数: 13