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Granular Matter in Extraterrestrial Environments - Modeling and Simulation of Regolith in Planetary Exploration

Lichtenheldt, Roy (2017) Granular Matter in Extraterrestrial Environments - Modeling and Simulation of Regolith in Planetary Exploration. EMN Soft Materials, June 18 to 22, 2017 in Vienna, Austria, Vienna, Austria.

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Kurzfassung

In everydays life, moving on soft, sandy soils is a well known task for everyone us. Regardless, the interaction physics of and with granular matter is still not fully understood. Whilst in terrestrial applications a direct recovery of locomotion gear is possible by external means, planetary exploration are fend for themselves.The talk will introduce enhanced but yet efficient simulation methods that are used in development of locomotion gear. Validated application models allow for in-depth analysis of the interaction, even beyond the possibilities given by measurements: As shown in figure 1 flows of granular matter may be tracked in any part of the medium, forces and locomotion behaviour can be predicted and mutual influences of locomotion gear and sand can by analyzed. Given the possibilities of the models, particle simulation poses a great chance to further improve future locomotion gear. Thus the focus will be on improvements of the particle-based Discrete Element Method (DEM). One of the tasks for modeling the correct shear strength of granular matter is efficient coverage of grain rolling and interlocking. To allow for efficient simulations the complex shapes of real grains need to be simplified. Covering certain features like angularity or rounded edges is crucial. In the proposed approach two dimensional rolling geometries are attached to the spherical grains and superimposed to 3D equivalent bodies [1]. Resulting in an improved non-linear torque behaviour, it becomes possible to cover behaviour like tilting or rotational interlocking. Details on the method will be presented alongside torque-laws for different shapes, including edge rounding. A second challenge in particle simulations is parameter identification. Real-world sand grains are too small to directly identify inter-grain contact parameters. The state of the art treats this problem with multi-parameter calibration to measured data, leading to non-unique solutions in long lasting processes [2]. A method to identify a parameter set without the need of preliminary simulations or calibration has been developed [3] and will be explained throughout the talk. Additionally methods to improve efficiency, e.g. dynamic boundaries, will be shown. The presented methods will be presented alongside their applications in current planetary exoploration mission. These range from “the Mole”, a self-impelling nail for NASA’s InSight Mission to Mars, over MASCOT, DLR’s asteroid hopping currently on its way to asteroid Ryugu, to Wheels of planetary exploration rovers (Figure 1).

elib-URL des Eintrags:https://elib.dlr.de/112793/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Granular Matter in Extraterrestrial Environments - Modeling and Simulation of Regolith in Planetary Exploration
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Lichtenheldt, Royroy.lichtenheldt (at) dlr.dehttps://orcid.org/0000-0002-2539-4910NICHT SPEZIFIZIERT
Datum:2017
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:DEM, Exploration, soil Mechanics, granular matter
Veranstaltungstitel:EMN Soft Materials, June 18 to 22, 2017 in Vienna, Austria
Veranstaltungsort:Vienna, Austria
Veranstaltungsart:internationale Konferenz
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Technik für Raumfahrtsysteme
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R SY - Technik für Raumfahrtsysteme
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt MOREX [SY], R - Projekt InSight - HP3, R - Projekt Mascot (Rob.)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Systemdynamik und Regelungstechnik > Raumfahrt-Systemdynamik
Hinterlegt von: Lichtenheldt, Roy
Hinterlegt am:30 Aug 2017 16:38
Letzte Änderung:30 Aug 2017 16:38

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