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Ryan C. Sneed
Associate Principal Engineer at Moog Space and Defense Group
SPIE Involvement:
Author
Area of Expertise:
Hexapods , Positioning Systems , Motion Control , Actuators
Profile Summary
My interest is designing and building high precision hexapods and other multi-degree-of-freedom motion control systems. Successful past programs include building the secondary mirror hexapod and camera hexapod/rotator for LSST and building the Center of Curvature Optical Bench (CoCOB) hexapod for ground testing of the James Webb Space Telescope. My current program is developing a high precision hexapod and supporting motion control system for upgrades to the X-Ray & Cryogenic Facility (XRCF) at NASA's Marshall Space Flight Center.
Publications (5)
Proceedings Article | 6 July 2018 Paper
Testing and status of the LSST hexapods and rotator
Ryan Sneed, Douglas Neill, Brendan Caldwell, Bryan Walter, Harini Sundararaman, Mike Warner
Proceedings Volume 10700, 1070039 (2018) https://doi.org/10.1117/12.2311500
KEYWORDS: Cameras, Actuators, Computer programming, Large Synoptic Survey Telescope, Motion measurement, Telescopes, Mirrors, Electroluminescence, Velocity measurements, Sensors
Proceedings Article | 27 July 2016 Paper
Final design of the LSST hexapods and rotator
Proceedings Volume 9906, 99060K (2016) https://doi.org/10.1117/12.2231327
KEYWORDS: Large Synoptic Survey Telescope, Cameras, Actuators, Telescopes, Mirrors, Optical instrument design, Neodymium, Interfaces, Electromechanical design, Space telescopes
Proceedings Article | 4 August 2014 Paper
Error reduction and modeling for hexapod positioners of secondary mirrors for large ground-based telescopes
Proceedings Volume 9150, 915020 (2014) https://doi.org/10.1117/12.2056644
KEYWORDS: Actuators, Sensors, Systems modeling, Performance modeling, Mirrors, Telescopes, Computer programming, Error analysis, Lead, Model-based design
Proceedings Article | 18 July 2014 Paper
Baseline design of the LSST hexapods and rotator
Proceedings Volume 9151, 91512B (2014) https://doi.org/10.1117/12.2056799
KEYWORDS: Cameras, Telescopes, Mirrors, Actuators, Electronics, Large Synoptic Survey Telescope, Spindles, Control systems, Interfaces, Space telescopes
Proceedings Article | 5 August 2010 Paper
Six degrees of freedom, sub-micrometer positioning system for secondary mirrors
Ryan Sneed, Michael Cash, Trevor Chambers, Paul Janzen
Proceedings Volume 7733, 77332R (2010) https://doi.org/10.1117/12.857793
KEYWORDS: James Webb Space Telescope, Actuators, Telescopes, Space telescopes, Mirrors, Earthquakes, Lead, Computer programming, Kinematics, Manufacturing
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