{"586080":{"#nid":"586080","#data":{"type":"event","title":"Ph.D. Thesis Proposal: Alexandra Cheryl Long","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003EPh.D. Dissertation Proposal by\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Ch2\u003E\u003Cstrong\u003EAlexandra Cheryl Long\u003C\/strong\u003E\u003C\/h2\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAdvisor: Dr. David Spencer\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Ch2\u003E\u003Cstrong\u003EDevelopment of Passively Stable Pyramid Sail ([ps]\u003Csup\u003E2\u003C\/sup\u003E) to Deorbit Small Satellites\u003C\/strong\u003E\u003C\/h2\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E3 p.m., Monday, January 30, \u003Cem\u003EMontgomery Knight Building -317\u003C\/em\u003E\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cdiv\u003E\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract: \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EOrbital debris is a growing problem in low-Earth orbit; it has crossed a threshold of critical density where the number of debris objects will grow exponentially due to collisions unless actively mitigated. There are a number of commercial companies that intend to launch hundreds to thousands of micro-satellites in Low-Earth Orbit at altitudes ranging from 1,000-1,200 km with the goal of providing global internet service. The need to deorbit these microsatellites at the end of their operational lifetime is apparent. \u0026nbsp;This study investigates a standardized bolt-on system to address the deorbit problem for microsatellites, with applicability to planned large constellations of 150 kg-class satellites at 1,100-1,200 km altitudes. Through a trade study, it was determined that a passive drag sail device provides a reliable approach for satellite deorbit.\u0026nbsp; To reliably deorbit within 25 years, the drag sail should be designed to provide aerodynamic stability, trimming to a maximum drag attitude. A stability analysis determine that the sail should be a square pyramid shape with an apex half-angle of 75\u0026deg; to ensure stability. Prototype hardware development for the drag device is planned, with three main phases. The first is the boom deployer design and analysis, which includes prototype development and an analysis on boom blossoming in the system. The second is the sail mounting design, which includes connecting the sail segments to the booms and folding them for the stowed configuration. The final phase is the system prototype testing to ensure that the booms and sails deploy together creating the desired shape.\u003C\/p\u003E\r\n\r\n\u003Cdiv\u003E\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003C\/p\u003E\r\n\u003C\/div\u003E\r\n\r\n\u003Cp\u003EDr. E. Glenn Lightsey\u003Cbr \/\u003E\r\nAerospace Engineering\u003Cbr \/\u003E\r\n\u003Cem\u003EGeorgia Institute of Technology\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cdiv\u003E\r\n\u003Cp\u003EDr. Julian Rimoli\u003Cbr \/\u003E\r\nAerospace Engineering\u003Cbr \/\u003E\r\n\u003Cem\u003EGeorgia Institute of Technology\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EMr. Mark Schoenenberger\u003Cbr \/\u003E\r\nAtmospheric Flight and Entry Systems Branch\u003Cbr \/\u003E\r\n\u003Cem\u003ENASA Langley Research Center\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EMr. Les Johnson\u003Cbr \/\u003E\r\nAdvanced Concepts Office\u003Cbr \/\u003E\r\n\u003Cem\u003ENASA Marshall Space Flight Center\u003C\/em\u003E\u003C\/p\u003E\r\n\u003C\/div\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\u003C\/div\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003EAlexandra Cheryl Long \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003Ewill present her proposal for doctoral research in the\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u0026quot;Development of Passively Stable Pyramid Sail ([ps]\u003Csup\u003E2\u003C\/sup\u003E) to Deorbit Small Satellites\u0026quot;\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E3 p.m., Monday, January 30 \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003E\u003Cem\u003EMontgomery Knight Building -317\u003C\/em\u003E\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"\u0022Development of Passively Stable  Pyramid Sail ([ps]2) to Deorbit Small Satellites\u0022"}],"uid":"33975","created_gmt":"2017-01-17 19:55:45","changed_gmt":"2017-04-13 21:13:16","author":"Margaret Ojala","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2017-01-30T15:00:00-05:00","event_time_end":"2017-01-30T17:00:00-05:00","event_time_end_last":"2017-01-30T17:00:00-05:00","gmt_time_start":"2017-01-30 20:00:00","gmt_time_end":"2017-01-30 22:00:00","gmt_time_end_last":"2017-01-30 22:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"1239","name":"School of Aerospace Engineering"}],"categories":[],"keywords":[{"id":"2082","name":"aerospace engineering"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78771","name":"Public"},{"id":"78751","name":"Undergraduate students"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}