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Soil simulant sourcing for the ExoMars rover testbed

Gouache, TP, Brunskill, C, Scott, G, Saaj, CM, Matthews, M, Cui, L and Patel, N (2011) Soil simulant sourcing for the ExoMars rover testbed Journal of Planetary and Space Science, 59 (8). 779 - 787. ISSN 0032-0633

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Abstract

ExoMars is the European Space Agency (ESA) mission to Mars planned for launch in 2018, focusing on exobiology with the primary objective of searching for any traces of extant or extinct carbon-based micro-organisms. The on-surface mission is performed by a near-autonomous mobile robotic vehicle (also referred to as the rover) with a mission design life of 180 sols Patel et al. (2010). In order to obtain useful data on the tractive performance of the ExoMars rover before flight, it is necessary to perform mobility tests on representative soil simulant materials producing a Martian terrain analogue under terrestrial laboratory conditions. Three individual types of regolith shown to be found extensively on the Martian surface were identified for replication using commercially available terrestrial materials Patel (2011), sourced from UK sites in order to ensure easy supply and reduce lead times for delivery. These materials (also referred to as the Engineering Soil Simulants (ES-x) are: a fine dust analogue (ES-1); a fine aeolian sand analogue (ES-2); and a coarse sand analogue (ES-3). Following a detailed analysis, three fine sand regolith types were identified from commercially available products. Each material was used in its o -the-shelf state, except for ES-2, where further processing methods were used to reduce the particle size range. These materials were tested to determine their physical characteristics, including the particle size distribution, dry bulk density, particle shape (including angularity / sphericity) and moisture content. The results are analysed to allow comparative analysis with existing soil simulants and the published results regarding in-situ analysis of Martian soil on previous NASA missions. The findings have shown that in some cases material properties vary significantly from the specifications provided by material suppliers. It has confirmed that laboratory testing is necessary to determine the actual parameters and that standard geotechnical processes are suitable for doing so. The outcomes have allowed the confirmation of each simulant material as suitable for replicating their respective regolith types.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Planetary and Space Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Planetary and Space Science, 59(8), June 2011, DOI 10.1016/j.pss.2011.03.006.
Divisions: Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Depositing User: Symplectic Elements
Date Deposited: 12 Jan 2012 12:13
Last Modified: 23 Sep 2013 18:59
URI: http://epubs.surrey.ac.uk/id/eprint/105841

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