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Flexible Mode Modelling of the InSight Lander and Consequences for the SEIS Instrument

Murdoch, Naomi and Alazard, Daniel and Knapmeyer-Endrun, B. and Teanby, N. A. and Myhill, R. Flexible Mode Modelling of the InSight Lander and Consequences for the SEIS Instrument. (2018) Space Science Reviews, 214 (117). 1-24. ISSN 0038-6308

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Official URL: https://doi.org/10.1007/s11214-018-0553-y

Abstract

We present an updated model for estimating the lander mechanical noise on the InSight seismometer SEIS, taking into account the flexible modes of the InSight lander. This new flexible mode model uses the Satellite Dynamics Toolbox to compute the direct and the inverse dynamic model of a satellite composed of a main body fitted with one or several dynamic appendages. Through a detailed study of the sensitivity of our results to key environment parameters we find that the frequencies of the six dominant lander resonant modes increase logarithmically with increasing ground stiffness. On the other hand, the wind strength and the incoming wind angle modify only the signal amplitude but not the frequencies of the resonances. For the baseline parameters chosen for this study, the lander mechanical noise on the SEIS instrument is not expected to exceed the instrument total noise requirements. However, in the case that the lander mechanical noise is observable in the seismic data acquired by SEIS, this may provide a complementary method for studying the ground and wind properties on Mars.

Item Type:Article
HAL Id:hal-01915826
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Max Planck Society (GERMANY)
Other partners > University of Bristol (UNITED KINGDOM)
Other partners > Max-Planck-Institut für Sonnensystemforschung - MPS (GERMANY)
Laboratory name:
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Deposited By: Naomi Murdoch
Deposited On:07 Nov 2018 10:48

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