Extended Pile Driving Model to Predict the Penetration of the Insight/HP3 Mole into the Martian Soil

Joshua Poganski, Norbert I. Kömle, Günter Kargl, Helmut F. Schweiger, Matthias Grott, Tilman Spohn, Olaf Krömer, Christian Krause, Torben Wippermann, Georgios Tsakyridis, Mark Fittock, Roy Lichtenheldt, Christos Vrettos, José E. Andrade

Research output: Contribution to journalReview articleResearchpeer-review

Abstract

The NASA InSight mission will provide an opportunity for soil investigations using the penetration data of the heat flow probe built by the German Aerospace Center DLR. The Heat flow and Physical Properties Probe (HP3) will penetrate 3 to 5 meter into the Martian subsurface to investigate the planetary heat flow. The measurement of the penetration rate during the insertion of the HP3 will be used to determine the physical properties of the soil at the landing site. For this purpose, numerical simulations of the penetration process were performed to get a better understanding of the soil properties influencing the penetration performance of HP3. A pile driving model has been developed considering all masses of the hammering mechanism of HP3. By cumulative application of individual stroke cycles it is now able to describe the penetration of the Mole into the Martian soil as a function of time, assuming that the soil parameters of the material through which it penetrates are known. We are using calibrated materials similar to those expected to be encountered by the InSight/HP3 Mole when it will be operated on the surface of Mars after the landing of the InSight spacecraft. We consider various possible scenarios, among them a more or less homogeneous material down to a depth of 3–5 m as well as a layered ground, consisting of layers with different soil parameters. Finally we describe some experimental tests performed with the latest prototype of the InSight Mole at DLR Bremen and compare the measured penetration performance in sand with our modeling results. Furthermore, results from a 3D DEM simulation are presented to get a better understanding of the soil response.

Original languageEnglish
Pages (from-to)217-236
Number of pages20
JournalSpace Science Reviews
Volume211
Issue number1-4
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • Dynamic CPT
  • Mars surface regolith
  • Mole penetration models
  • NASA discovery mission InSight

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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