ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4218
James N. Martin, Ryan A. Noguchi, R. Minnichelli, Marilee J. Wheaton
{"title":"Implementing Enterprise Systems Engineering Enabled by the Digital Engineering Approach","authors":"James N. Martin, Ryan A. Noguchi, R. Minnichelli, Marilee J. Wheaton","doi":"10.2514/6.2020-4218","DOIUrl":"https://doi.org/10.2514/6.2020-4218","url":null,"abstract":"","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133077480","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}
ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4230
Yuji Takubo, Hao Chen, K. Ho
{"title":"Performance Analysis of Hierarchical Reinforcement Learning Framework for Stochastic Space Logistics","authors":"Yuji Takubo, Hao Chen, K. Ho","doi":"10.2514/6.2020-4230","DOIUrl":"https://doi.org/10.2514/6.2020-4230","url":null,"abstract":"","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"210 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114008405","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}
ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4262
M. M. Esfandabadi, O. Bannova
{"title":"Greenhouse Architecture Analysis in Partial Gravity of Mars and Moon","authors":"M. M. Esfandabadi, O. Bannova","doi":"10.2514/6.2020-4262","DOIUrl":"https://doi.org/10.2514/6.2020-4262","url":null,"abstract":"","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123085797","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}
ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4195
Ezinne Uzo-Okoro, Daniel Erkel, P. Manandhar, M. Dahl, Emily Kiley, K. Cahoy, O. Weck
{"title":"Optimization of On-Orbit Robotic Assembly of Small Satellites","authors":"Ezinne Uzo-Okoro, Daniel Erkel, P. Manandhar, M. Dahl, Emily Kiley, K. Cahoy, O. Weck","doi":"10.2514/6.2020-4195","DOIUrl":"https://doi.org/10.2514/6.2020-4195","url":null,"abstract":"On-orbit assembly missions typically involve humans-in-the-loop and use large custom-built robotic arms designed to service existing modules. A proposed concept of on-orbit robotic assembly of modularized CubeSat components within a spacecraft locker eliminates the need for humans-in-the loop. The spacecraft locker supports use cases such as rapidly placing failed nodes within a constellation of satellites and providing sensing and propulsion capabilities in Low Earth Orbit. Despite the recent proliferation of small satellites, there are few planned demonstrations of on-orbit assembly and few demonstrations of on-orbit servicing. Key gaps challenges of in-space assembly of small satellites are (1) the lack of standardization of electromechanical CubeSat components for compatibility with commercial robotic assembly hardware, and (2) testing and modifying commercial robotic assembly hardware. In this work, we focus on testing and modifying: we develop an optimization process for a robotic assembly model to integrate small satellites in space. Our process focus is on the optimization of the on-orbit assembly time of small satellites. We use Commercial-Off-The-Shelf (COTS) robot arms to snap together components in a spacecraft, while minimizing humans-in-the-loop. Assembly time is the selected performance metric as it is critical to the assertion that building small satellites on-orbit results in reduced budget and satellite development time on Earth. We minimize on-orbit small satellite assembly time by optimizing assembly time with the Genetic Algorithm, which use dexterous robotic arms to assemble components, without any negative effects on the attitude and control system. We implement a robot arm assembly model in Python, using Inverse Kinematics. We use a Genetic Algorithm-based optimization scheme, with time as the objective function, and three constraints: robot assembly volume, power consumption, and peak power. Design variables such as joint damping, motor force (torque), position gain and velocity gain are used to model grasping a component and moving the component to the satellite assembly area of the spacecraft. The robot arms are required to be within a tolerance defined based on the 300 mm x 300 mm x 500 mm assembly area. In simulation, we observe that using a given baseline servo motor (7 V) at high proportional gains results in optimal assembly time of approximately 10-20 seconds per component assembly, compared to roughly double this time per component for a 1U CubeSat weighing 2 kg. However, we expect this improvement to result in 25% higher power consumption. Using a high gain value with a lower voltage (5 V) motor results in oscillations and additional time required to dampen out to within the given tolerance, and results in increased assembly time. The benchmarked small satellite assembly time with a human-in-the-loop requires 50 weeks to 90 months of component assembly and integration time on Earth. We anticipate that on-orbit a","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128928089","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}
ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4132
John Cooper, J. Neilan, M. Mahlin, Laura M. White
{"title":"Assemblers: A Modular, Reconfigurable Manipulator for Autonomous in-Space Assembly","authors":"John Cooper, J. Neilan, M. Mahlin, Laura M. White","doi":"10.2514/6.2020-4132","DOIUrl":"https://doi.org/10.2514/6.2020-4132","url":null,"abstract":"","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128534139","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}
ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4023
Collin Deans, Theresa C. Furgiuele, Daniel D. Doyle, Jonathan T. Black
{"title":"Simulating Omni-Directional Aerial Vehicle Operations for Modeling Satellite Dynamics","authors":"Collin Deans, Theresa C. Furgiuele, Daniel D. Doyle, Jonathan T. Black","doi":"10.2514/6.2020-4023","DOIUrl":"https://doi.org/10.2514/6.2020-4023","url":null,"abstract":"","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116808497","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}
ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4130
Doggett William
{"title":"Architecture Options for Creation of a Persistent Platform Orbital Testbed","authors":"Doggett William","doi":"10.2514/6.2020-4130","DOIUrl":"https://doi.org/10.2514/6.2020-4130","url":null,"abstract":"","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115668633","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}
ASCEND 2020Pub Date : 2020-11-02DOI: 10.2514/6.2020-4082
R. Adams, J. Cassibry, K. Schillo, Brian Taylor
{"title":"The Pulsed Fission-Fusion (PuFF) Engine - Nacelle Concept and Development Roadmap","authors":"R. Adams, J. Cassibry, K. Schillo, Brian Taylor","doi":"10.2514/6.2020-4082","DOIUrl":"https://doi.org/10.2514/6.2020-4082","url":null,"abstract":"","PeriodicalId":153489,"journal":{"name":"ASCEND 2020","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115788220","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}