AN EVALUATION OF A PASSIVELY COOLED CYLINDRICAL SPECTROMETER ARRAY IN LUNAR ORBIT by JASON WAGGONER A THESIS Submitted in partial fulfillment of the requirements for the degree of Master of Science in Engineering in The Department of Mechanical and Aerospace Engineering to The School of Graduate Studies of The University of Alabama in Huntsville HUNTSVILLE, ALABAMA 2014 ACKNOWLEDGMENTS It cannot be understated how much I have benefitted from the assistance, attention and insight provided by a great deal of people. I always begin by thanking my God who gives me strength and wisdom only to be followed by my patient wife and children. Second, my thesis committee (in particular the chair and advisor) has been unbelievably patient and instructive. As this thesis pushed me in areas in which I have very little experience, my colleagues at work have demonstrated time and again why I am proud to be associated with such wonderful people and competent members of the scientific community. In no particular order of preference I list below the names of those individuals. Brain O’Connor Greg Schunk Deborah Hernandez Shawn Breeding John Sharp Jim Duffy Ron Hunt Patrick Hull Ken Kittredge Jeff Farmer I would also like to mention my immediate supervisors at NASA who allowed me great lee way and were understanding as I completed this thesis. Cynthia Ferguson Chris Coppens Tony Lavoie v TABLE OF CONTENTS Page TABLE OF CONTENTS ............................................................................................... VI LIST OF FIGURES ..................................................................................................... VIII LIST OF TABLES .......................................................................................................... IX CHAPTER ONE ............................................................................................................... 1 INTRODUCTION .......................................................................................................................................... 1 Overview ................................................................................................................................................ 1 Approach ................................................................................................................................................ 4 Historical Lunar Missions ....................................................................................................................... 6 CHAPTER TWO ............................................................................................................ 15 CASE STUDY .............................................................................................................................................. 15 Mission Background ............................................................................................................................. 15 System Design ...................................................................................................................................... 17 Constraints ........................................................................................................................................... 19 Array Cylinder Sizing ............................................................................................................................ 24 Trial Mission Design Summary ............................................................................................................. 31 CHAPTER THREE ........................................................................................................ 33 METHODOLOGY ........................................................................................................................................ 33 Analysis Setup ...................................................................................................................................... 33 Analysis Cases ...................................................................................................................................... 40 Models ................................................................................................................................................. 49 CHAPTER FOUR ........................................................................................................... 61 RESULTS AND CONCLUSIONS .................................................................................................................... 61 vi Results .................................................................................................................................................. 61 Conclusions .......................................................................................................................................... 70 REFERENCES ......................................................................................................................................... 73 THERMAL SOFTWARE OVERVIEW ........................................................................................................ 76 vii LIST OF FIGURES Figure Page Figure 1 LOCO Cylindrical Sensor Array Concept ............................................................ 5 Figure 2 Pioneer Lunar Probe (Pioneer 3 2013) ................................................................. 9 Figure 3 Ranger 9.............................................................................................................. 10 Figure 4 Lunar Prospector ................................................................................................ 12 Figure 5 LRO Instrumentation .......................................................................................... 13 Figure 6 Architecture Nomenclature ................................................................................ 19 Figure 7 Ball Aerospace Mission Concept Study Summaries .......................................... 21 Figure 8 3D Single Row Structure Model for an Array Cylinder 3.4m in Diameter ....... 27 Figure 9 Machined Orthogrid Pockets .............................................................................. 28 Figure 10 Radiation Case Schematic ................................................................................ 36 Figure 11 Array Mass Calculation from Individual Rows................................................ 40 Figure 12 Analysis Cases Progression Summary ............................................................. 42 Figure 13 Orientation of Sun in Relation to Moon ........................................................... 51 Figure 14 Array Coordinate System ................................................................................. 52 Figure 15 Thermal Model Features................................................................................... 55 Figure 16 Model Surfaces Viewed from Top ................................................................... 56 Figure 17 Model Surfaces Viewed from Bottom .............................................................. 57 Figure 18 Close-Up of Radiation Model .......................................................................... 57 Figure 19 Model Orbit Example and Coordinate Systems ............................................... 58 Figure 20 Thermal Load Map ........................................................................................... 60 viii LIST OF TABLES Table Page Table 1 Lunar Missions Reviewed ..................................................................................... 7 Table 2 Launch Vehicle Fairing Geometry Constraints ................................................... 22 Table 3 Sensor Module Charateristics .............................................................................. 22 Table 4 Mission Parameters .............................................................................................. 23 Table 5 Cylinder Mass Summary for Maximum Diameters ............................................. 29 Table 6 Cylinder Mass Summary 1.0 m and 2.2 m .......................................................... 29 Table 7 Generic Analysis Case Parameter Table .............................................................. 38 Table 8 Total Row Mass (kg) Per Cylinder Diameter ...................................................... 41 Table 9 Baseline Conduction and Radiation Cases – 4.6 m ............................................. 43 Table 10 Baseline Conduction and Radiation Cases – 3.4 m ........................................... 43 Table 11 Sensor Module Energy Conduction and Radiation Analysis Cases – 4.6 m ..... 44 Table 12 Sensor Module Energy Conduction and Radiation Analysis Cases – 3.4 m ..... 44 Table 13 Orbit Beta Angle Conduction and Radiation Cases – 4.6 m ............................. 45 Table 14 Orbit Altitude Conduction and Radiation Cases – 4.6 m .................................. 45 Table 15 Orbit Beta Angle Conduction and Radiation Cases – 3.4 m ............................. 45 Table 16 Orbit Altitude Conduction and Radiation Cases – 3.4 m .................................. 46 Table 17 Dimension Conduction and Radiation Cases – 3.4 m ....................................... 47 Table 18 Dimension Conduction and Radiation Cases – 2.2 m ....................................... 47 Table 19 Dimension Conduction and Radiation Cases – 1.0 m ....................................... 47 Table 20 No Disk Cases – 4.6 m....................................................................................... 48 Table