Publications

Selected Articles in Journals

  • Putnam, Z. R., Braun, R. D., Rohrschneider, R. R., and Dec, J. A., “Entry System Options for Human Return from the Moon and Mars,” Journal of Spacecraft and Rockets, Vol. 44, No. 1 (2007), pp.194- 202. doi: 10.2514/1.20351
  • Wooster, P. D., Braun, R. D., Ahn, J., and Putnam, Z. R., "Mission Design Options for Human Mars Missions," MARS: The International Journal of Mars Science and Exploration, Vol. 3, Aug. 2007, pp. 12-28.
  • Putnam, Z. R., Braun, R. D., Bairstow, S. H., and Barton, G. H., “Improving Lunar Return Entry Range Capability Using Enhanced Skip Trajectory Guidance,” Journal of Spacecraft and Rockets, Vol. 45, No. 2 (2008), pp. 309-315. doi: 10.2514/1.27616
  • Meginnis, I., Putnam, Z. R., Clark, I. G., and Braun, R. D., "Guided Entry Performance of Low Ballistic Coefficient Vehicles at Mars," Journal of Spacecraft and Rockets, Vol. 50, No. 5 (2013), pp. 1047-1059. doi: 10.2514/1.A32425
  • Putnam, Z. R. and Braun, R. D., "Precision Landing at Mars Using Discrete-Event Drag Modulation," Journal of Spacecraft and Rockets, Vol. 51, No. 1 (2014), pp. 128-138. doi: 10.2514/1.A32633
  • Putnam, Z. R. and Braun, R. D., "Drag-Modulation Flight-Control System Options for Planetary Aerocapture," Journal of Spacecraft and Rockets, Vol. 51, No. 1 (2014), pp. 139-150. doi: 10.2514/1.A32589
  • Putnam, Z. R., Grant, M. J., Kelly, J. R., Braun, R. D., and Krevor, Z. C., "Feasibility of Guided Entry for a Crewed Lifting Body Without Angle-of-Attack Control," Journal of Guidance, Control, and Dynamics, Vol. 37, No. 3 (2014), pp. 729-740. doi: 10.2514/1.62214
  • Putnam, Z. R. and Braun, R. D., "Extension and Enhancement of the Allen-Eggers Solution for Ballistic Entry Trajectories," Journal of Guidance, Control, and Dynamics, Vol. 38, No. 3 (2015), pp. 414-430. doi: 10.2514/1.G000846

Articles in Conference Proceedings

  • Weston, N., Mavris, D., Fitzgerald, C., Putnam, Z. R., and Pouchet, C., "A Conceptual Design Environment for Technology Selection and Performance Optimization for Torpedoes," AIAA Paper 2002-5590, 9th AIAA/ISSMO Symposium on Multidisciplinary Analysis and Optimization, Atlanta, GA, Sep. 2-6, 2002.
  • Putnam, Z. R., Braun, R. D., Rohrschneider, R. R., and Dec, J. A., "Entry System Options for Human Return from the Moon and Mars," AIAA Paper 2005-5915, AIAA Atmospheric Flight Mechanics Conference and Exhibit, San Francisco, CA, Aug. 15-18, 2005.
  • Wooster, P. D., Braun, R. D., Ahn, J., and Putnam, Z. R., "Trajectory Options for Human Mars Missions," AIAA Paper 2006-6308, AIAA/AAS Astrodynamics Specialist Conference and Exhibit, Keystone, CO, Aug. 21-24, 2006.
  • Putnam, Z. R., Braun, R. D., Bairstow, S. H., and Barton, G. H., "Improving Lunar Return Entry Footprints Using Enhanced Skip Trajectory Guidance," AIAA Paper 2006-7438, AIAA Space 2006 Conference, San Jose, CA, Sep. 19-21, 2006.
  • Rea, J. R. and Putnam, Z. R., "A Comparison of Two Orion Skip Entry Guidance Algorithms," AIAA Paper 2007-6424, AIAA Guidance, Navigation, and Control Conference and Exhibit, Hilton Head, SC, Aug. 20-23, 2007.
  • Putnam, Z. R. and Barton, G. H., "Entry Range Capability Analysis of the Orion Crew Module," IEEEAC paper #1524, 2008 IEEE Aerospace Conference, Mar. 1-8, 2008.
  • Sargent, R., Barton, G. H., Putnam, Z. R., and Neave, M. D., "PredGuid Lateral Channel Guidance during Skip Entry for Orion," AAS Paper 09-093, ITAR-restricted paper, AAS Guidance and Control Conference, Breckenridge, CO, Jan. 31-Feb. 4, 2009.
  • Putnam, Z. R., Barton, G. H., and Neave, M. D., "An Entry Trajectory Design Methodology for Lunar Return," AIAA Paper 2009-5773, AIAA Guidance, Navigation, and Control Conference and Exhibit, Chicago, IL, Aug. 10-13, 2009.
  • Putnam, Z. R., Neave, M. D., and Barton, G. H., "PredGuid Entry Guidance for Orion Return from Low Earth Orbit," IEEEAC paper #1571, 2010 IEEE Aerospace Conference, Big Sky, MT, Mar. 6-13, 2010.
  • Meginnis, I., Putnam, Z. R., Clark, I. G., and Braun, R. D., "Guided Entry Performance of Low Ballistic Coefficient Vehicles at Mars," 2012 IEEE Aerospace Conference, Big Sky, MT, Mar. 3-10, 2012.
  • Putnam, Z. R., Clark, I. G., and Braun, R. D., "Drag Modulation Flight Control for Aerocapture," 2012 IEEE Aerospace Conference, Big Sky, MT, Mar. 3-10, 2012.
  • Putnam, Z. R., Grant, M. J., Kelly, J. R., Braun, R. D., and Krevor, Z. C., "Variable Angle-of-attack Profile Entry Guidance for a Crewed Lifting Body," AIAA Paper 2013-0029, 51st AIAA Aerospace Sciences Meeting, Grapevine, TX, Jan. 2013.
  • Putnam, Z. R. and Braun, R. D., "Drag Modulation Flight Control System Options for Planetary Aerocapture," AIAA Paper 2013-0030, 51st AIAA Aerospace Sciences Meeting, Grapevine, TX, Jan. 2013.
  • Putnam, Z. R. and Braun, R. D., "Precision Landing at Mars Using Discrete-event Drag Modulation," AAS Paper 13-438, Advances in the Astronautical Sciences, Vol. 148, Univelt, Inc., San Diego, CA, 2013, pp. 3815-3834.
  • Braun, R. D., Putnam, Z. R., Steinfeldt, B. A., and Grant, M. J., "Advances in Inertial Guidance Technology for Aerospace Systems," AIAA Paper 2013-5123, AIAA Guidance, Navigation, and Control Conference, Boston, MA, Aug. 2013.
  • Putnam, Z. R. and Braun, R. D., "Enhancement and Extension of the Allen-Eggers Solution for Ballistic Entry Trajectories," AIAA Paper 2014-2381, AIAA Atmospheric Flight Mechanics Conference, Atlanta, GA, Jun. 2014.
  • Putnam, Z. R. and Braun, R. D., "Analytical Assessment of Drag-Modulation Trajectory Control for Planetary Entry," AAS Paper 15-748, AAS Astrodynamics Specialist Conference, Vail, CO, Aug. 2015.
  • Anderson, T. R., Putnam, Z. R., and Braun, R. D., "Strategies for Landing Large Ballistic Coefficient Vehicles on Mars," AIAA Paper 2016-0021, AIAA Atmospheric Flight Mechanics Conference, San Diego, CA, Jan. 4-8, 2016.
  • Putnam, Z. R. and Braun, R. D., "Review and Assessment of the Steep Lifting Entry Closed-Form Trajectory Solution," AIAA Paper 2016-0278, AIAA Atmospheric Flight Mechanics Conference, San Diego, CA, Jan. 4-8, 2016.
  • Putnam, Z. R. and Braun, R. D., "Advances in Guidance, Navigation, and Control for Planetary Entry, Descent, and Landing Systems," AAS Paper 16-092, AAS Guidance and Control Conference, Breckenridge, CO, Feb. 5-10, 2016.
  • Lohan, K. G. and Putnam, Z. R., "Moving-Mass Actuator System Options For Entry Vehicles with Deployable Decelerators," AAS Paper 16-373, AAS Spaceflight Mechanics Meeting, Napa, CA, Feb. 14-18, 2016.
  • Lorenz, C. G. and Putnam, Z. R., "Optimal Hypersonic Trajectory Strategies for Supersonic Retropropulsion at Mars," AIAA Paper 2017-0247, AIAA Atmospheric Flight Mechanics Conference, Grapevine, TX, Jan. 9-13, 2017.
  • Lohan, K. G. and Putnam, Z. R., "Moving Mass Actuator Control for Mars Entry Vehicles," AAS Paper 17-134, AAS Guidance and Control Conference, Breckenridge, CO, Feb. 3-8, 2016.
  • Sepulveda, J. and Putnam, Z. R., "An Assessment of Aerodynamic Flaps for Planetary Entry Trajectory Control," AAS Paper 17-035, AAS Guidance and Control Conference, Breckenridge, CO, Feb. 3-8, 2016.