Zobrazeno 1 - 10
of 48
pro vyhledávání: '"David M. Murphy"'
Publikováno v:
3rd AIAA Spacecraft Structures Conference.
Large, deployable space-based solar array structures are an enabling technology for the solar electric propulsion technologies slated to power many future space missions. These arrays must be extensible from meters to tens of meters in dimension in o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::85380c60622cb812b14c189bbbeb2a46
https://doi.org/10.2514/6.2016-1702
https://doi.org/10.2514/6.2016-1702
Publikováno v:
3rd AIAA Spacecraft Structures Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::652ec77be64b3f12bee86a314e34e47e
https://doi.org/10.2514/6.2016-1947
https://doi.org/10.2514/6.2016-1947
Autor:
David M. Murphy
Publikováno v:
Journal of Spacecraft and Rockets. 44:797-808
A T THE start of 2003, ABLE Engineering (now part of ATK Space Systems and Sensors), in parallel with other activities [1] also under the purview of the In-Space Propulsion (ISP) projects office at NASA Marshall Space Flight Center (MSFC), began deve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e4a16c05a0a68213c71138cfb445ef6
https://doi.org/10.2514/1.23024
https://doi.org/10.2514/1.23024
Autor:
Bong Wie, David M. Murphy
Publikováno v:
Journal of Spacecraft and Rockets. 44:809-821
This paper presents the solar-sail attitude control system design for a solar-sail flight validation mission proposed in a dawn–dusk sun-synchronous orbit. The proposed solar-sail attitude control system architecture consists of a propellantless pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e7e07c195af8e96a84feeb36b57a95c
https://doi.org/10.2514/1.22996
https://doi.org/10.2514/1.22996
Publikováno v:
Journal of Spacecraft and Rockets. 44:765-783
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b02fa34447d52ce09d2b6ebb089967e6
https://doi.org/10.2514/1.22897
https://doi.org/10.2514/1.22897
Publikováno v:
2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC).
This paper reviews the application history of UltraFlex solar power technology and the recently demonstrated evolution of the mechanical platform into MegaFlex to support higher power level applications. A MegaFlex wing employs UltraFlex technology e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5cc7af95b669f2a3ba2c7d50d8534c26
https://doi.org/10.1109/pvsc.2015.7355945
https://doi.org/10.1109/pvsc.2015.7355945
Publikováno v:
The Journal of Hand Surgery. 28:898-903
Purpose: To quantify and compare the disabilities caused by reduced and absent wrist motion using objective measurements of task performance and perceived disability, and to assess the compensatory motions of the shoulder, elbow, forearm, and trunk c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7537571e5f315d251e67dcdcd0704b6b
https://doi.org/10.1016/s0363-5023(03)00424-6
https://doi.org/10.1016/s0363-5023(03)00424-6
Autor:
William D. Deininger, Scott Enger, Joe Hackel, Juancarlos Soto, Bryce Unruh, David M. Murphy, Kristi H. de Grys
Publikováno v:
50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference.
The Solar Electric Propulsion (SEP) Technology Demonstration Mission (TDM) is a stepping stone leading to a reusable electric propulsion stage by demonstrating high power (10s kW) transfers from LEO to GEO and back to LEO. A scaled SEP TDM concept is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c0904a6636ed553f5182ebcb370d813
https://doi.org/10.2514/6.2014-3716
https://doi.org/10.2514/6.2014-3716
Publikováno v:
50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::04de5db8f6329f3bfaa3d70eed36e7a7
https://doi.org/10.2514/6.2014-3907
https://doi.org/10.2514/6.2014-3907
Autor:
David M. Murphy, Kristi DeGrys, J. C. Soto, William D. Deininger, Bryce Unruh, Joe Hackel, Scott Enger
Publikováno v:
2014 IEEE Aerospace Conference.
A 30 kW solar electric propulsion (SEP) technology demonstration mission (TDM) concept is described. The mission concept is formulated in response to NASA's BAA and demonstrates a modular and extensible solar electric propulsion system. It launches i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9928de25d8db7072c724b3e9d1c752ac
https://doi.org/10.1109/aero.2014.6836468
https://doi.org/10.1109/aero.2014.6836468