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Rosetta lander Philae - soil strength analysis

Roll, Reinhard and Witte, L. and Arnold, W. (2016) Rosetta lander Philae - soil strength analysis. Icarus, 280, pp. 359-365. Elsevier. doi: 10.1016/j.icarus.2016.07.004. ISSN 0019-1035.

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The landing of Philae, the lander of ESA’s ROSETTA-mission, on November 12th 2014 on Comet 67P/Churyumov-Gerasimenko, was planned as a descent with passive landing activating a damper system and anchoring by harpoons at touch-down. The lander was not fixed to the ground at touch-down due to failing harpoons. The lander damper, however, was actuated for a length of 42.6 mm with a maximal speed of 0.08 m/s, while the lander speed was 1 m/s. Based on the damper data and a detailed mechanical model of Philae, an estimate can be made for the forces acting and the energy dissipated at touch-down inside the lander and the energy dissipated by ground penetration. The forces acting at ground penetration provide constraints on the mechanical strength of the soil. Two different soil models are investigated. Assuming constant compressive strength σ, one obtains σ ≈ 2 kPa. Assuming an increasing σs strength with penetration depth with results in σs = 3kPa/m fits the damper data best.

Item URL in elib:https://elib.dlr.de/106244/
Document Type:Article
Title:Rosetta lander Philae - soil strength analysis
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Roll, ReinhardMax Planck Institute for Solar System Research, Göttingen, GermanyUNSPECIFIED
Witte, L.DLR Bremen, lars.witte (at) dlr.deUNSPECIFIED
Arnold, W.w.arnold (at) mx.uni-saarland.deUNSPECIFIED
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2016.07.004
Page Range:pp. 359-365
Keywords:Philae lander, ROSETTA, soil strength, comet nucleus
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Vorhaben Landetechnologien (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Explorationssysteme
Deposited By: Witte, Dr. Lars
Deposited On:29 Sep 2016 11:17
Last Modified:06 Sep 2019 15:26

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