Space: Science & Technology最新文献_第7页

Optimal Multi-impulse Linear Rendezvous via Reinforcement Learning 基于强化学习的最优多脉冲线性交会

Space: Science & Technology Pub Date : 2023-01-01 DOI: 10.34133/space.0047

Longwei Xu, Gang Zhang, Shi Qiu, Xibin Cao

引用次数: 0

Adapting a Mars ISRU System to the Changing Mars Environment 火星ISRU系统适应不断变化的火星环境

Space: Science & Technology Pub Date : 2023-01-01 DOI: 10.34133/space.0041

D. Rapp, E. Hinterman

引用次数: 0

On the Analytical Models of Protoplanetary Formation in Extrasolar Systems 太阳系外原行星形成的解析模型

Space: Science & Technology Pub Date : 2022-11-12 DOI: 10.34133/2022/9862389

A. Krot

{"title":"On the Analytical Models of Protoplanetary Formation in Extrasolar Systems","authors":"A. Krot","doi":"10.34133/2022/9862389","DOIUrl":"https://doi.org/10.34133/2022/9862389","url":null,"abstract":"In this work, we consider a statistical theory for a cosmogonical body formation (so-called spheroidal body) to develop the analytical models of protoplanetary formation in extrasolar systems. Within the framework of this theory, the models and evolution equations of the statistical mechanics have been proposed, while the well-known problem of gravitational condensation of infinite distributed cosmic substances has been solved. This paper derives the general equation of distribution of the specific angular momentum of forming protoplanets since the specific angular momentums (for particles or planetesimals) are averaged during a conglomeration process (under a planetary embryo formation). As a result, a new law for planetary distances (which generalizes Schmidt’s law) is derived theoretically. This paper develops also an alternative thermal emission of particles model of the formation of protoplanets in extrasolar systems. Within the framework of this model, the equation for the thermal distribution function of the specific angular momentums of particles moving in elliptical orbits in the gravitational field is derived. According to this thermal escape model, only 0.8% of the total number of particles in the solar system composing the protoplanetary cloud has angular momentum 15.6 times higher than the angular momentum of the remaining 99% of particles. This conclusion agrees completely with the known fact of a nonuniform distribution of the angular momentums in our solar system noted by ter Haar. As pointed out here, the exponential laws of planetary distances occur in some extrasolar systems.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128503447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Overview of the CHILL-ICE 2021 Science Experiments and Research Campaign CHILL-ICE 2021科学实验与研究活动概述

Space: Science & Technology Pub Date : 2022-11-12 DOI: 10.34133/2022/9760968

David J. K. Smith, C. Pouwels, M. Heemskerk, Benedetta M. Cattani, Esther Konijnenberg, R. Heemskerk, Sebasthian Ogalde

{"title":"Overview of the CHILL-ICE 2021 Science Experiments and Research Campaign","authors":"David J. K. Smith, C. Pouwels, M. Heemskerk, Benedetta M. Cattani, Esther Konijnenberg, R. Heemskerk, Sebasthian Ogalde","doi":"10.34133/2022/9760968","DOIUrl":"https://doi.org/10.34133/2022/9760968","url":null,"abstract":"The main objective of the CHILL-ICE (Construction of a Habitat Inside a Lunar-analogue Lava tube—Iceland; a campaign by ICEE Space and EuroMoonMars) prototype mission was to deploy an inflatable habitat and its systems inside a lunar analogue lava tube. This took place during an 8-hour extra vehicular activity (EVA) with three analogue astronauts as part of a three-day mission. CHILL-ICE 2021 was carried out in July/August 2021 and consisted of two missions and was accomplished through successful collaboration of nonprofit research organizations, agencies, companies, and universities across 16 nations. The pilot campaign successfully reached its main objective: the testing of emergency equipment designed to help astronauts survive when first arriving to a new celestial body and to perform experiments similar to those that would be carried out off-planet. This article is a review of the scientific research experiments carried out during and after the mission: SpotNet, an artificial intelligence (AI) astronaut detection vision system; training for studies of the geological surroundings examined during EVAs; astronaut vigilance experiments carried out before, during, and after the mission; and Lunar Zebro, a legged rover intended to assist the crew in traversing and exploring harsh terrain.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127918558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Karst Cave as Terrestrial Simulation Platform to Test and Design Human Base in Lunar Lava Tube 以溶洞为地面模拟平台设计月球熔岩管人类基地

Space: Science & Technology Pub Date : 2022-11-04 DOI: 10.34133/2022/9875780

Jinghang Ding, Gengxin Xie, Linli Guo, Xin Xiong, Ya Han, Xi Wang

{"title":"Karst Cave as Terrestrial Simulation Platform to Test and Design Human Base in Lunar Lava Tube","authors":"Jinghang Ding, Gengxin Xie, Linli Guo, Xin Xiong, Ya Han, Xi Wang","doi":"10.34133/2022/9875780","DOIUrl":"https://doi.org/10.34133/2022/9875780","url":null,"abstract":"Developing efficient approaches to building a suitable environment for humans on the moon play a key role in future long-term sustainable lunar exploration activities, which has motivated many countries to propose diverse plans to build a lunar base. The lava tubes discovered by the Kaguya mission offer huge potential sites to host such bases. Through computation and analysis, we show that lunar lava tubes offer stable structures, suitable temperatures, low radiation doses, and low meteorite impact rates. We summarize previous research results and put forward the conditions to find and use a suitable lunar lava tube for human habitation on the moon. The establishment of extraterrestrial bases still faces many technical bottlenecks; many countries have begun to use the earth’s environment for extraterrestrial exploration and simulation missions. In this regard, we proposed the idea of using the Earth’s karst caves to simulate extraterrestrial lava tubes, selected caves in Chongqing as the simulation site, and demonstrated the feasibility from both structural and environmental aspects. Finally, we proposed a karst cave simulation platform with three main research directions: cave sealing technology, efficient daylight system, and internal circulation research of artificial ecosystems containing natural soil and rock. We hope to promote the development of related research on extraterrestrial bases through simulation experiments.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134406268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Challenges of Artificial Intelligence in Space Medicine 人工智能在空间医学中的挑战

Space: Science & Technology Pub Date : 2022-10-29 DOI: 10.34133/2022/9852872

Ethan Waisberg, Joshua Ong, P. Paladugu, Sharif Amit Kamran, Nasif Zaman, Andrew Lee, A. Tavakkoli

引用次数: 15

Angle-Only Target Tracking Method for Optical Imaging Micro-/Nanosatellite Based on APSO-SSUKF 基于APSO-SSUKF的光学成像微纳卫星单角度目标跟踪方法

Space: Science & Technology Pub Date : 2022-10-27 DOI: 10.34133/2022/9898147

Bing Hua, Guang Yang, Yunhua Wu, Zhiming Chen

{"title":"Angle-Only Target Tracking Method for Optical Imaging Micro-/Nanosatellite Based on APSO-SSUKF","authors":"Bing Hua, Guang Yang, Yunhua Wu, Zhiming Chen","doi":"10.34133/2022/9898147","DOIUrl":"https://doi.org/10.34133/2022/9898147","url":null,"abstract":"To ensure the safety of the space station and improve the accuracy of the estimated trajectory tracking of noncooperative target, an optical imaging micro-/nanosatellite based on APSO-SSUKF (adaptive particle swarm optimization-spherical simplex unscented Kalman filter) is proposed to track low-orbit target using angle-only measurement. First, the algorithm considers the effect of J2 perturbation, uses the angle-only data as the observation vector, and uses spherical simplex unscented Kalman filter (SSUKF) to reduce the cost of calculation of the UKF in space noncooperative target tracking. Secondly, it is proposed to use the actual and theoretical covariance of the innovation sequence for real-time estimation of measurement noise, designing the adaptive particle swarm optimization (APSO) algorithm for real-time tracking of the process noise in the SSUKF that improves the accuracy of the filter in angle-only tracking. Finally, the tracking simulation of low-orbit satellite is carried out by using optical imaging micro-/nanosatellite, and the result shows that, compared with UKF, SSUKF, and PSO-SSUKF, APSO-SSUKF reduces the root mean square of the error in predicting the position in space target tracking by 45.44%, 35.26%, and 20.94%, and APSO-SSUKF reduces the root mean square of the error in velocity by 45.58%, 33.53%, and 16.33%, respectively; in the angle-tracking target, APSO-SSUKF improves the convergence and estimated accuracy of the algorithm in tracking.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"152 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114091616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Study on Aerodynamic Performance of Mars Parachute Models with Geometric Porosities 几何孔隙度火星降落伞模型气动性能的数值研究

Space: Science & Technology Pub Date : 2022-10-14 DOI: 10.34133/2022/9851982

Lulu Jiang, H. Jia, X. Xu, W. Rong, Wei Jiang, Qi Wang, Gang Chen, X. Xue

{"title":"Numerical Study on Aerodynamic Performance of Mars Parachute Models with Geometric Porosities","authors":"Lulu Jiang, H. Jia, X. Xu, W. Rong, Wei Jiang, Qi Wang, Gang Chen, X. Xue","doi":"10.34133/2022/9851982","DOIUrl":"https://doi.org/10.34133/2022/9851982","url":null,"abstract":"The supersonic flows around rigid parachute-like two-body configurations are numerically simulated at Mach number of 1.978 by solving three-dimensional compressible Navier-Stokes equations, where the two-body model consists of a capsule and a canopy, and a geometric structure (i.e., gap) is located on the canopy surface. The objective of this study is to investigate the effects of gaps with different porosities and positions on the aerodynamic performance of supersonic parachute. The complicated periodic aerodynamic interactions between the capsule wake and canopy shock occur around these two-body models. From the formation of canopy shock and drag coefficient variation, the cycled flow structures can be divided into three types:(1) narrow wake period, (2) open wake period, and (3) middle wake period. In addition, it was found that the geometric gaps have no obvious influences on the flow modes. However, compared with models with different gap positions, the two-body model with an upper gap (gap is close to the canopy vent, UG model) has a smaller drag coefficient fluctuation and better lateral stability. On the other side, the increase of porosity has a more significant impact on UG models.","PeriodicalId":136587,"journal":{"name":"Space: Science & Technology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123888705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advances in Space Robots 空间机器人研究进展

Space: Science & Technology Pub Date : 2022-10-11 DOI: 10.34133/2022/9764036

Zhihong Jiang, Jinguo Liu, Yiwei Liu, Hui Li

引用次数: 1

Terrestrial Analogue Research to Support Human Performance on Mars: A Review and Bibliographic Analysis 支持人类在火星上工作的陆地模拟研究:综述和文献分析

Space: Science & Technology Pub Date : 2022-10-06 DOI: 10.34133/2022/9841785

A. Terhorst, Jason A. Dowling

引用次数: 1

Space: Science &amp; Technology最新文献

Space: Science & Technology最新文献