Zobrazeno 1 - 10
of 594
pro vyhledávání: '"Jerome A. Johnson"'
Publikováno v:
Shock and Vibration, Vol 15, Iss 2, Pp 127-135 (2008)
A physical model of low-velocity probe penetration is developed to characterize soil by type, strength, maximum compaction, and initial density using Newton's second law to describe the processes controlling probe momentum loss. The probe loses momen
Externí odkaz:
https://doaj.org/article/2fe9c0bf2da1478095995de24cd5e280
Publikováno v:
Journal of Geophysical Research: Planets. 123:972-981
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a9831f14238dfa93885b3727f27fe01
https://doi.org/10.1002/2017je005392
https://doi.org/10.1002/2017je005392
Publikováno v:
Journal of Terramechanics. 73:61-71
A previous three-dimensional discrete element method (DEM) model of Mars Exploration Rovers (MERs) wheel mobility demonstrated agreement with test data for wheel drawbar pull and sinkage for wheel slips from 0.0 to 0.7. Here, results from the previou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aa0782c8c78e5be2f46f10072392464c
https://doi.org/10.1016/j.jterra.2017.09.002
https://doi.org/10.1016/j.jterra.2017.09.002
Publikováno v:
Acta Astronautica. 127:424-437
Planning for NASA's Asteroid Redirect Mission (ARM) requires estimating the forces that appear during extraction of a boulder from the surface of an asteroid with unknown surface regolith properties. These forces are estimated for a vertical constant
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::978cac98f9da16608a165c68de9d9724
https://doi.org/10.1016/j.actaastro.2016.06.027
https://doi.org/10.1016/j.actaastro.2016.06.027
Autor:
Philip T. Metzger, Edward B. Bierhaus, David M. Reeves, Jerome B. Johnson, Paul Sánchez, Leslie S. Gertsch, Anton V. Kulchitsky, Daniel J. Scheeres, Christine Hartzell, Daniel T. Britt, Kris Zacny, Benton C. Clark
Geotechnical properties of a granular material affect all surface operations from mobility to landing and excavation. As such, significant efforts to study and model these properties are necessary before sending a spacecraft. Lack of knowledge of reg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5e8d5090e8979a151acd662b158aed9
https://doi.org/10.1016/b978-0-12-813325-5.00008-2
https://doi.org/10.1016/b978-0-12-813325-5.00008-2
Autor:
Neyda M. Abreu, Conel M.O'D. Alexander, Victor Ali-Lagoa, José C. Aponte, Maria A. Barucci, Pierre Beck, Edward B. Bierhaus, Daniel T. Britt, Humberto Campins, Noel Chaumard, Beth E. Clark, Benton Clark, Edward A. Cloutis, Christopher Dreyer, Jason P. Dworkin, Linda T. Elkins-Tanton, Jamie E. Elsila, Joshua Emery, Marcello Fulchignoni, Leslie Gertsch, Daniel P. Glavin, Christine M. Hartzell, Amanda Hendrix, Charles Hibbitts, Kieren Howard, Matthew R.M. Izawa, Robert Jedicke, Natasha Johnson, Jerome B. Johnson, Anton V. Kulchitsky, Julia de León, Hal Levison, Javier Licandro, Stanley G. Love, Maggie McAdam, Timothy McCoy, Phil Metzger, Tatsuhiro Michikami, Takaaki Noguchi, Joseph A. Nuth, Craig E. Peterson, Carol Raymond, David M. Reeves, Andrew Rivkin, Alan Rubin, Paul Sanchez, Juan A. Sánchez, Daniel J. Scheeres, Joel C. Sercel, Driss Takir, Michael A. Velbel, Otis Walton, Hikaru Yabuta, Makoto Yoshikawa, Kris Zacny, Michael E. Zolensky, Xiao-Duan Zou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4265c99f63d042567726b93c7a08b276
https://doi.org/10.1016/b978-0-12-813325-5.01002-8
https://doi.org/10.1016/b978-0-12-813325-5.01002-8
Autor:
Karl Iagnemma, P. Duvoy, Carmine Senatore, Jerome B. Johnson, Raymond E. Arvidson, Anton V. Kulchitsky, J. M. Moore
Publikováno v:
Journal of Terramechanics. 62:31-40
Mars Exploration Rovers (MERs) experienced mobility problems during traverses. Three-dimensional discrete element method (DEM) simulations of MER wheel mobility tests for wheel slips of i=0, 0.1, 0.3, 0.5, 0.7, 0.9, and 0.99 were done to examine high
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::765594b76a920f54870367b63e96fc67
https://doi.org/10.1016/j.jterra.2015.02.004
https://doi.org/10.1016/j.jterra.2015.02.004
Publikováno v:
Hydrological Processes. 29:1418-1433
The US Army ERDC CRREL and the US Department of Agriculture Natural Resources Conservation Service developed a square electronic snow water equivalent (e-SWE) sensor as an alternative to using fluid-filled snow pillows to measure SWE. The sensors con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f4b7e6720301c78d8b9cfa981a8a45e
https://doi.org/10.1002/hyp.10211
https://doi.org/10.1002/hyp.10211
Publikováno v:
International Journal for Numerical and Analytical Methods in Geomechanics
This paper describes a new method for representing concave polyhedral particles in a discrete element method as unions of convex dilated polyhedra. This method offers an efficient way to simulate systems with a large number of (generally concave) pol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70c198dd6be224815573d0585046c9a7
https://doi.org/10.1002/nag.2299
https://doi.org/10.1002/nag.2299
Publikováno v:
Journal of Travel Research; April 1971, Vol. 9 Issue: 4 p17-17, 1p