Statistics – Computation
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p23c1282f&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P23C-1282
Statistics
Computation
[5418] Planetary Sciences: Solid Surface Planets / Heat Flow, [6250] Planetary Sciences: Solar System Objects / Moon
Scientific paper
Heat flow information is essential for studying the composition and internal structure of the Moon and other planetary bodies. Heat flow data is typically obtained by inserting a probe to certain depth below the surface and measuring the local thermal conductivity and temperature gradient. For robotic landing missions, the limit in total mass and power consumption requires special design of probe insertion and sensor systems. Although there have been efforts in the development of such probes, the technology has not been used successfully and the understanding of the fundamental processes involved in the penetration and heat transfer is limited. The team from Utah State University and Space Dynamics Lab is developing a tethered heat flow probe for potential lunar and other planetary missions. The probe consists of a penetrator, which uses an internal percussive mechanism, and a tethered cable attached to the penetrator to function as the data and power link, as well as thermal conductivity and temperature sensors. The research focused on two important issues: (1) how to optimize the percussive penetration with specific soil and gravitational characteristics; and (2) what is the thermal uncertainty level caused by the disturbance due to the lander, probe penetration, and soil stratification. Laboratory experiments and computation studies were performed to provide answers toward these two questions. This presentation summarizes the overall concept of the probe and presents current experimental results in these topics.
Allen Daniel
Ban H.
Fish C. S.
Sellers Shaun
White Jack
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