Minimum Functionality Lunar Habitation Element
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Minimum Functionality Lunar Habitation Element by The University of Maryland Space Systems Laboratory Dr. David L. Akin Massimiliano Di Capua Adam D. Mirvis Omar W. Medina William Cannan Kevin Davis July 2009 ABSTRACT Title: MINIMUM FUNCTIONALITY LUNAR HABITATION ELEMENT Dr. David L. Akin, Massimiliano Di Capua, Adam D. Mirvis, Omar W. Medina, William Cannan, Kevin Davis University of Maryland - Space Systems Laboratory February 2009 NASA’s vision for the future of space exploration includes the establishment of a permanent human presence on the Moon through the Constellation program. Under the auspices of the NASA Exploration Systems Mission Directorate, the University of Mary- land Space Systems Laboratory has investigated, through literature reviews, a survey, and rigorous statistical methods, the definition of Minimal Functionality Habitation Element for medium duration lunar missions. By deploying a survey and making use of the Analyt- ical Hierarchy Process (AHP) and the Quality Function Deployment (QFD) methods, the study team determined a list of functions and their relative importance, as well as their impact on systems design/implementation. Based on the past literature and the survey results, four habitat concepts were proposed, focusing on interior space layout and prelim- inary systems sizing. Those concepts were then evaluated for habitability through virtual reality (VR) techniques and merged into a single design. Trade studies were conducted and the final design was defined. A full-scale functional mockup of the final concept was also implemented to enable more realistic human factors studies and to validate the VR techniques used previously. This study was funded by the NASA Exploration Systems Mission Directorate (ESMD). BAA: NNJ08ZBT002, Topic 2. This is the final report for NASA Grant NNJ08TA89C. Acknowledgments The University of Maryland Space Systems Laboratory wishes to thank all who participated in our survey, especially the American and Italian Navies, whose extensive cooperation allowed us to acquire important data for our study. We also wish to thank Heather Bradshaw for all her help in setting up and conducting the data acquisition session at the Mars Society - Mars Desert Research Station (MDRS). We also wish to thank MDRS Crew 73 for participating in our study. Finally, special thanks go to the all the SSL personnel whose help, particularly in creating a full-scale habitat mockup outdoors in the coldest January in recent memory, was priceless. This study was funded by the NASA Exploration Systems Mission Directorate (ESMD), under BAA NNJ08ZBT002, Topic 2. We would like to acknowledge and thank Larry Toups, NASA COTR, supported by Marianne Rudisill and Kriss Kennedy, along with Chris Culbert (ESMD Surface Systems lead) and his deputy, Matt Leonard, for all of their help and support. Finally, we would also like to express our appreciation for all of the NASA and contractor personnel who participated in design reviews and the final briefing, for their excellent questions and even better advice and support. ii Contents List of Abbreviations xiii 1 Introduction 1 1.1 Background . 1 1.2 Research Approach . 2 1.3 Milestones and Deliverables . 3 2 Review of Relevant Literature and Research 4 2.1 Regions for Possible Landings . 4 2.2 Lunar Temperature Range . 7 2.3 Ionizing Radiation . 8 2.4 Micrometeoroid Impact . 8 2.5 Habitability in Confined and Austere Environments . 9 2.6 Past Designs . 15 3 Data Acquisition 18 3.1 Use of the Analytical Hierarchy Process . 18 3.2 AHP Implementation . 19 3.3 AHP Data . 22 3.4 AHP Analysis and Conclusions . 22 3.4.1 AHP Data Analysis . 22 3.4.2 Importance Value Conclusions . 28 3.5 Statistical Analysis . 28 3.5.1 Fidelity of Analogue Environments . 30 3.6 Quality Function Deployment . 30 3.7 Lessons Learned . 33 4 Preliminary Concepts 35 4.1 General Requirements from BAA . 35 4.1.1 General Requirements List . 35 4.1.2 Contract Deliverables . 36 4.2 Concept Development Approach . 36 4.3 Initial Concept . 37 4.3.1 EVA Support . 37 4.3.2 Structure . 38 4.3.3 Radiation Shielding . 38 4.3.4 Life Support . 38 4.4 Concept 1 : The Lunar Pup-Tent . 42 4.4.1 Operational Scenario . 42 iii 4.4.2 System Concept . 42 4.4.3 Interior Layout . 43 4.4.4 Life Support . 43 4.4.5 Avionics, Power, Thermal, and Communications . 44 4.4.6 Structure and Storage . 45 4.5 Concept 2 : The Winnebago . 46 4.5.1 Operational Scenario . 46 4.5.2 Design Concept . 46 4.5.3 Pressurization and Furnishing . 46 4.5.4 Interior Layout and SPE Shelter . 47 4.5.5 Life Support . 48 4.5.6 Avionics, Power and Thermal . 49 4.5.7 Exterior Layout and EVA . 49 4.6 Concept 3 : The Igloo . 50 4.6.1 Operational Scenario . 50 4.6.2 System Concept . 50 4.6.3 Habitat Layout . 51 4.6.4 Structure . 52 4.6.5 Life Support . 52 4.6.6 Power . 53 4.6.7 Avionics . 53 4.6.8 Additional Equipment . 53 4.6.9 Summary . 53 4.7 Virtual Reality Testing and Evaluation . 54 4.7.1 Equipment . 54 4.7.2 Lessons Learned . 55 5 Configuration Trade Studies 57 5.1 Analytical Modeling . 57 5.2 Trade Studies . 60 6 Mockup Design Construction and Testing 65 6.1 Design and Construction . 65 6.2 ECLIPSE Crew I: Mission Report . 70 6.3 Lessons Learned . 72 7 Final Design: ECLIPSE 77 7.1 Configuration . 77 7.1.1 Exterior Configuration . 77 7.1.2 Interior Layouts . 82 7.1.3 Configuration Growth Options . 83 7.2 Life Support Systems . 84 7.2.1 Basic Assumptions . 84 7.2.2 EVA Support Requirements . 85 7.2.3 Air Circulation . 86 7.2.4 CO2 Capture . 87 7.2.5 Air Revitalization . 89 7.2.6 Air Replenishment . 90 7.2.7 Water Reclamation . 90 iv 7.2.8 Food Storage and Preparation . 91 7.2.9 Waste Management . 91 7.2.10 Logistics and Storage . 91 7.2.11 Lighting . 92 7.3 Power Budgets . 93 7.4 Thermal Control . 93 7.5 Mass Budgets . 95 8 Conclusions and Future Work 99 8.1 Conclusions . 99 8.2 Future Work . 99 8.2.1 Mars Society Crew 73 Data Acquisition Preview . 99 8.2.2 Potential Future Analytical Studies . 100 8.2.3 Future Mockup Development and Testing . 100 A Web Survey Screenshots 104 B ANOVA tables 114 C Renovated ECLIPSE Interior Configuration 126 C.1 Lower Level . 126 C.2 Upper Level . 127 C.3 Exterior Views . 128 D Partial Gravity Simulations of Habitat Habitability Issues 129 D.1 Underwater Simulation of Partial Gravity . 129 D.2 Upper Berth Ingress/Egress Study . 129 D.3 Intralevel Motion Study . 130 E Alternative ECLIPSE Interior Configurations - Academic Leverage of ESMD Study 133 E.1 Team Alpha . 133 E.2 Team Beta . ..