Mr. Ryan C. Sneed Profile

Ryan C. Sneed

Associate Principal Engineer at Moog Space and Defense Group

SPIE Involvement:

Author

Area of Expertise:

Hexapods , Positioning Systems , Motion Control , Actuators

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.

Proceedings Article | 26 August 2024 Presentation + Paper

Hexapod load and range of motion analysis for expanding optomechanical applications at NASA Marshall’s X-ray and Cryogenic Facility

Bryan Walter, Matt Granrud, Mark Welle, Mark Mimovich, Roger Glaese, Ryan Sneed

Proceedings Volume 13100, 131001B (2024) https://doi.org/10.1117/12.3018517

KEYWORDS: Finite element methods, Actuators, Kinematics, Design, Motion models, X-rays, Optical metrology, Modeling, Cryogenics, Optical testing

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Proceedings Article | 23 August 2024 Poster + Paper

Repurposing the James Webb Space Telescope’s center of curvature optical bench hexapod for future mirror calibration testing at NASA Marshall’s x-ray and cryogenic facility

Bryan Walter, Mark Welle, Ryan Sneed, Mark Mimovich, Matt Granrud, Jeffrey Kegley

Proceedings Volume 13092, 130923R (2024) https://doi.org/10.1117/12.3018508

KEYWORDS: Vacuum chambers, James Webb Space Telescope, X-rays, Human-machine interfaces, X-ray telescopes, ITAR, Ear, Actuators, Vacuum, Design

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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

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Proceedings Article | 27 July 2016 Paper

Final design of the LSST hexapods and rotator

Ryan Sneed, Douglas Neill, Scott Kidney, Constanza Araujo, William Gressler, Paul Lotz, Dave Milles, Jacques Sebag, Thomas Sebring, Mickael Warner, Oliver Wiecha

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

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Proceedings Article | 4 August 2014 Paper

Error reduction and modeling for hexapod positioners of secondary mirrors for large ground-based telescopes

Ryan Sneed, Paul Keas

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

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Proceedings Article | 18 July 2014 Paper

Baseline design of the LSST hexapods and rotator

Douglas Neill, Ryan Sneed, Jake Dawson, Jacques Sebag, Willaim Gressler

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

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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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